3.0l Diesel - Dtcs p0016 to p049d Jeep Grand Cherokee WK2

Scheme 506

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article .

WHEN MONITORED

Continuously with the engine cranking and engine running.

SET CONDITION

Powertrain Control Module detects an error when the camshaft position is out of phase with the crankshaft position.

POSSIBLE CAUSES

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

DIAGNOSTIC TEST

1. CHECKING THE (K44) CMP SIGNAL WITH A LAB SCOPE Using a lab scope, back probe the (K44) CMP Signal circuit at the CMP Sensor harness connector. CAUTION: Use only approved back probe tools when back probing a connector so as not to cause damage to the terminals or insulation of the connector. Damage to the terminals can cause poor terminal contact or retention. Damage to the insulation can introduce corrosion due to water infiltration. Start the engine. Observe the lab scope screen. NOTE: The CMP Sensor is a hall-effect type sensor that produces a 5-Volt digital (square wave) signal. Are there any irregular or missing signals? Yes Go To 2 . No Go To 4 .
2. CMP WIRE HARNESS INSPECTION Turn the ignition off. Visually inspect the related wire harness. Look for any chafed, pierced, pinched, or partially broken wires. Visually inspect the related wire harness connectors. Look for broken, bent, pushed out, or corroded terminals. Make sure the Camshaft Position Sensor is properly installed and the mounting bolt(s) are torqued to their proper specification. Perform any TSBs that may apply. Were any of the above conditions present? Yes Repair as necessary. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Go To 3 .
3. TONE WHEEL/PULSE RING INSPECTION Remove the Camshaft Position Sensor. Refer to «SENSOR, CAMSHAFT POSITION, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . Inspect the Tone Wheel/Pulse Ring for damage, foreign material, or excessive movement. Were any problems found? Yes Repair or replace the Tone Wheel/Pulse Ring as necessary. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Replace the Camshaft Position Sensor in accordance with the service information. Refer to «SENSOR, CAMSHAFT POSITION, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
4. ERRATIC CMP SIGNAL Turn the ignition off. Remove the lab scope probe. Inspect the CMP Sensor connector and harness connector, and inspect the PCM connector and harness connector for loose, bent, corroded, or pushed out pins/terminals. Inspect the related wire harness and the splices in the CMP circuit. Ignition on, engine not running. With scan tool, erase DTCs. Start the engine. Gently tap on and wiggle the Cam Position Sensor. Did this DTC return? Yes Repair the wiring/connector concerns as needed or replace the Camshaft Position Sensor in accordance with the service information. Refer to «SENSOR, CAMSHAFT POSITION, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Go To 5 .
5. CHECK THE (K24) CKP SIGNAL WITH A LAB SCOPE Turn the ignition off. With a lab scope, back probe the (K24) CKP Signal circuit at the CKP harness connector. CAUTION: Use only approved back probe tools when back probing a connector so as not to cause damage to the terminals or insulation of the connector. Damage to the terminals can cause poor terminal contact or retention. Damage to the insulation can introduce corrosion due to water infiltration. Start the engine. Observe the lab scope screen. NOTE: The CKP Sensor is a hall-effect type sensor that produces a 5-Volt digital (square wave) signal. Are there any irregular or missing signals? Yes Go To 6 . No Go To 8 .
6. CKP WIRE HARNESS INSPECTION Turn the ignition off. Visually inspect the related wire harness. Look for any chafed, pierced, pinched, or partially broken wires. Visually inspect the related wire harness connectors. Look for broken, bent, pushed out, or corroded terminals. Make sure the Crankshaft Position Sensor is properly installed and the mounting bolt(s) are torqued to their proper specification. Perform any Technical Service Bulletins (TSBs) that may apply. Were any of the above conditions present? Yes Repair as necessary. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Go To 7 .
7. CRANKSHAFT MAGNETIC TONE WHEEL INSPECTION Remove the Crankshaft Position Sensor. Refer to «SENSOR, CRANKSHAFT POSITION, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . Inspect the Crankshaft magnetic tone wheel for damage, foreign material, or excessive movement. Were any problems found? Yes Repair or replace the CKP Magnetic tone wheel as necessary. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Replace the Crankshaft Position Sensor in accordance with the service information. Refer to «SENSOR, CRANKSHAFT POSITION, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
8. ERRATIC CKP SIGNAL NOTE: The conditions that set this DTC are not present at this time. The following test may help in identifying the intermittent condition. Turn the ignition off. Remove the lab scope probe. Inspect the CKP Sensor connector and harness connector, and inspect the PCM connector and harness connector for loose, bent, corroded, or pushed out pins/terminals. Inspect the related wire harness and the splices in the CKP circuit. Ignition on, engine not running. With scan tool, erase DTCs. Start the engine. Gently tap on and wiggle the CKP Sensor. Did the DTC return? Yes Repair the wiring/connector concerns as needed or replace the Crankshaft Position Sensor. Refer to «SENSOR, CRANKSHAFT POSITION, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Perform the INTERMITTENT DTC diagnostic procedure. Refer to «INTERMITTENT DTC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .

Scheme 507

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article .

THEORY OF OPERATION

The Boost Pressure Actuator is an electrically operated DC motor designed to regulate the boost pressure output of the Turbocharger. The Boost Pressure Actuator is mounted to the side of the Turbocharger assembly. The Boost Pressure Actuator receives a 12 Volt power supply from the ASD circuit and a duty-cycle control signal from the Powertrain Control Module (PCM).

With the ignition on.

The Powertrain Control Module (PCM) detects that the (K137) Boost Pressure Actuator Control circuit is open for 0.5 second.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

Scheme 508

Scheme 509

1. DTC IS ACTIVE Ignition on, engine not running. With the scan tool, select View DTCs. Is the status Active for this DTC? Yes Go To 2 . No Perform the INTERMITTENT DTC diagnostic procedure. Refer to «INTERMITTENT DTC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
2. CHECK THE (F343) FUSED ASD RELAY OUTPUT CIRCUIT FOR AN OPEN/HIGH RESISTANCE Turn the ignition off. Disconnect the Boost Pressure Actuator harness connector. Turn the ignition on. Using a 12-volt test light connected to ground, check the (F343) Fused ASD Relay Output circuit in the Boost Pressure Actuator harness connector. NOTE: The test light should be illuminated and bright. Compare the brightness to that of a direct connection to the battery. Is the test light illuminated and bright? Yes Go To 3 . No Repair the (F343) Fused ASD Relay Output circuit for an open or high resistance. Inspect the related fuse, an open fuse may indicate a short to ground in the circuit. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
3. CHECK THE (K137) BOOST PRESSURE ACTUATOR CONTROL CIRCUIT FOR AN OPEN/HIGH RESISTANCE Turn the ignition off. Disconnect the PCM C1 harness connector. Measure the resistance of the (K137) Boost Pressure Actuator Control circuit between the Boost Pressure Actuator harness connector and the PCM C1 harness connector. Is the resistance below 5.0 Ohms? Yes Go To 4 . No Repair the (K137) Boost Pressure Actuator Control circuit for an open or high resistance. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
4. BOOST PRESSURE ACTUATOR Reconnect the Boost Pressure Actuator harness connector. Reconnect the PCM C1 harness connector. Turn the ignition on. With the scan tool, erase DTCs. Turn the ignition off. Disconnect the Boost Pressure Actuator harness connector. Connect a jumper between ground and the (K137) Boost Pressure Actuator Control circuit at the Boost Pressure Actuator harness connector. Turn the ignition on. With the scan tool, view DTCs. NOTE: The scan tool should display a P0047-Turbocharger Boost Control Circuit Low DTC with the jumper in place. Did the scan tool display the DTC as described above? Yes Replace the Turbocharger assembly in accordance with the service information. Refer to «TURBOCHARGER, REMOVAL»(ref-466389-S05125519972012042500000) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Go To 5 .
5. POWERTRAIN CONTROL MODULE Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Boost Pressure Actuator and the Powertrain Control Module (PCM). Look for any chafed, pierced, pinched, or partially broken wires. Look for broken, bent, pushed out or corroded terminals. Perform any Technical Service Bulletins that may apply. Were any problems found? Yes Repair as necessary. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Replace the Powertrain Control Module in accordance with the service information. Refer to «MODULE, POWERTRAIN CONTROL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/communication-devices/#electronic-control-modules-service-information) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .

P0046-TURBOCHARGER BOOST CONTROL CIRCUIT/EXCESSIVE CURRENT

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article .

The Boost Pressure Actuator is an electrically operated DC motor designed to regulate the boost pressure output of the Turbocharger. The Boost Pressure Actuator is mounted to the side of the Turbocharger assembly. The Boost Pressure Actuator receives a 12 Volt power supply from the ASD circuit and a duty-cycle control signal from the Powertrain Control Module (PCM).

With the engine running.

The Boost Pressure Actuator reports an internal error to the Powertrain Control Module (PCM).

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

Scheme 510

1. CHECK THE (F343) FUSED ASD RELAY OUTPUT CIRCUIT FOR AN OPEN/HIGH RESISTANCE Turn the ignition off. Disconnect the Boost Pressure Actuator harness connector. Turn the ignition on. Using a 12-volt test light connected to ground, check the (F343) Fused ASD Relay Output circuit in the Boost Pressure Actuator harness connector. NOTE: The test light should be illuminated and bright. Compare the brightness to that of a direct connection to the battery. Is the test light illuminated and bright? Yes Go To 2 . No Repair the (F343) Fused ASD Relay Output circuit for an open or high resistance. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
2. CHECK THE (Z903) BOOST PRESSURE ACTUATOR GROUND CIRCUIT FOR AN OPEN/HIGH RESISTANCE Turn the ignition off. Using a 12-volt test light connected to 12 Volts, check the (Z903) Boost Pressure Actuator Ground circuit in the Boost Pressure Actuator harness connector. NOTE: The test light should be illuminated and bright. Compare the brightness to that of a direct connection to the battery. Is the test light illuminated and bright? Yes Go To 3 . No Repair the (Z903) Boost Pressure Actuator Ground circuit for an open or high resistance. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
3. TURBOCHARGER AND BOOST PRESSURE ACTUATOR LINKAGE Make sure the ignition is off and the engine is cold. Inspect the Turbocharger and Boost Pressure Actuator linkage for damage, debris and other problems that could effect Turbocharger vane movement. Start engine and listen for abnormal Turbo noises. Were any problems found? Yes Repair or replace the Turbocharger as necessary in accordance with the service information. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Go To 4 .
4. BOOST PRESSURE ACTUATOR Turn the ignition off. Replace the Turbocharger assembly in accordance with the service information. Refer to «TURBOCHARGER, REMOVAL»(ref-466389-S05125519972012042500000) . Reconnect the PCM C1 harness connector. Turn the ignition on. With the scan tool, erase DTCs. Start the engine and allow it to idle. With the scan tool, view DTCs. Did the DTC return? Yes Go To 5 . No Test complete. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
5. POWERTRAIN CONTROL MODULE Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Boost Pressure Actuator and the Powertrain Control Module (PCM). Look for any chafed, pierced, pinched, or partially broken wires. Look for broken, bent, pushed out or corroded terminals. Perform any Technical Service Bulletins that may apply. Were any problems found? Yes Repair as necessary. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Replace the Powertrain Control Module in accordance with the service information. Refer to «MODULE, POWERTRAIN CONTROL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/communication-devices/#electronic-control-modules-service-information) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .

P0047-TURBOCHARGER BOOST CONTROL CIRCUIT LOW

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article .

The Boost Pressure Actuator is an electrically operated DC motor designed to regulate the boost pressure output of the Turbocharger. The Boost Pressure Actuator is mounted to the side of the Turbocharger assembly. The Boost Pressure Actuator receives a 12 Volt power supply from the ASD circuit and a duty-cycle control signal from the Powertrain Control Module (PCM).

With the ignition on.

The Powertrain Control Module (PCM) detects that the (K137) Boost Pressure Actuator Control circuit voltage is low for 3.0 seconds.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

Scheme 511

Scheme 512

1. DTC IS ACTIVE Ignition on, engine not running. With the scan tool, select View DTCs. Is the status Active for this DTC? Yes Go To 2 . No Perform the INTERMITTENT DTC diagnostic procedure. Refer to «INTERMITTENT DTC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
2. CHECK THE (K137) BOOST PRESSURE ACTUATOR CONTROL CIRCUIT FOR A SHORT TO GROUND Turn the ignition off. Disconnect the Boost Pressure Actuator harness connector. Disconnect the PCM C1 harness connector. Measure the resistance between ground and the (K137) Boost Pressure Actuator Control circuit in the Boost Pressure Actuator harness connector. Is the resistance above 10k Ohms? Yes Go To 3 . No Repair the (K137) Boost Pressure Actuator Control circuit for a short to ground. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
3. CHECK THE (K137) BOOST PRESSURE ACTUATOR CONTROL CIRCUIT FOR A SHORT TO THE (Z903) BOOST PRESSURE ACTUATOR GROUND CIRCUIT Measure the resistance between the (K137) Boost Pressure Actuator Control circuit and the (Z903) Boost Pressure Actuator Ground circuit at the Boost Pressure Actuator harness connector. Is the resistance above 10k Ohms? Yes Go To 4 . No Repair the short between the (K137) Boost Pressure Actuator Control circuit and the (Z903) Boost Pressure Actuator Ground circuit. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
4. BOOST PRESSURE ACTUATOR Reconnect the Boost Pressure Actuator harness connector. Reconnect the PCM C1 harness connector. Turn the ignition on. With the scan tool, erase DTCs. Turn the ignition off. Disconnect the Boost Pressure Actuator harness connector. Connect a jumper between the (K137) Boost Pressure Actuator Control circuit and the (F343) Fused Ignition Switch Output circuit at the Boost Pressure Actuator harness connector. Turn the ignition on. With the scan tool, view DTCs. NOTE: The scan tool should display a P0048-Turbocharger Boost Control Circuit High DTC with the jumper in place. Did the scan tool display the DTC as described above? Yes Replace the Turbocharger assembly in accordance with the service information. Refer to «TURBOCHARGER, REMOVAL»(ref-466389-S05125519972012042500000) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Go To 5 .
5. POWERTRAIN CONTROL MODULE Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Boost Pressure Actuator and the Powertrain Control Module (PCM). Look for any chafed, pierced, pinched, or partially broken wires. Look for broken, bent, pushed out or corroded terminals. Perform any Technical Service Bulletins that may apply. Were any problems found? Yes Repair as necessary. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Replace the Powertrain Control Module in accordance with the service information. Refer to «MODULE, POWERTRAIN CONTROL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/communication-devices/#electronic-control-modules-service-information) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .

P0048-TURBOCHARGER BOOST CONTROL CIRCUIT HIGH

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article .

The Boost Pressure Actuator is an electrically operated DC motor designed to regulate the boost pressure output of the Turbocharger. The Boost Pressure Actuator is mounted to the side of the Turbocharger assembly. The Boost Pressure Actuator receives a 12 volt power supply from the ASD circuit and a duty-cycle control signal from the Powertrain Control Module (PCM).

Continuously with the ignition on.

The Powertrain Control Module (PCM) detects that the (K137) Boost Pressure Actuator Control circuit voltage is high for 0.5 second.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

Scheme 513

Scheme 514

1. DTC IS ACTIVE Ignition on, engine not running. With the scan tool, select View DTCs. Is the status Active for this DTC? Yes Go To 2 . No Perform the INTERMITTENT DTC diagnostic procedure. Refer to «INTERMITTENT DTC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
2. CHECK THE (K137) BOOST PRESSURE ACTUATOR CONTROL CIRCUIT FOR A SHORT TO VOLTAGE Turn the ignition off. Disconnect the Boost Pressure Actuator harness connector. Turn the ignition on. Measure the voltage of the (K137) Boost Pressure Actuator Control circuit in the Boost Pressure Actuator harness connector. Is there any voltage present? Yes Repair the (K137) Boost Pressure Actuator Control circuit for a short to voltage. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Go To 3 .
3. CHECK THE (K137) BOOST PRESSURE ACTUATOR CONTROL FOR A SHORT TO THE (F343) FUSED ASD RELAY OUTPUT CIRCUIT Turn the ignition off. Disconnect the PCM C1 harness connector. Measure the resistance between the (K137) Boost Pressure Actuator Control circuit and the (F343) Fused ASD Relay Output circuit at the Boost Pressure Actuator harness connector. Is the resistance above 10k Ohms? Yes Go To 4 . No Repair the (K137) Boost Pressure Actuator Control circuit for a short to the (F343) Fused ASD Relay Output circuit. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
4. BOOST PRESSURE ACTUATOR Reconnect the Boost Pressure Actuator harness connector. Reconnect the PCM C1 harness connector. Turn the ignition on. With the scan tool, erase DTCs. Turn the ignition off. Disconnect the Boost Pressure Actuator harness connector. Connect a jumper between ground and the (K137) Boost Pressure Actuator Control circuit at the Boost Pressure Actuator harness connector. Turn the ignition on. With the scan tool, view DTCs. NOTE: The scan tool should display a P0047-Turbocharger Boost Control Circuit Low DTC with the jumper in place. Did the scan tool display the DTC as described above? Yes Replace the Turbocharger assembly in accordance with the service information. Refer to «TURBOCHARGER, REMOVAL»(ref-466389-S05125519972012042500000) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Go To 5 .
5. POWERTRAIN CONTROL MODULE Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Boost Pressure Actuator and the Powertrain Control Module (PCM). Look for any chafed, pierced, pinched, or partially broken wires. Look for broken, bent, pushed out or corroded terminals. Perform any Technical Service Bulletins that may apply. Were any problems found? Yes Repair as necessary. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Replace the Powertrain Control Module in accordance with the service information. Refer to «MODULE, POWERTRAIN CONTROL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/communication-devices/#electronic-control-modules-service-information) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .

Scheme 515

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article .

With the ignition on and the Oxygen Sensor Heater command on.

The Powertrain Control Module (PCM) detects that the O2 Sensor temperature is above it's maximum threshold for 30.0 seconds or below it's minimum threshold for 60.0 seconds.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

Scheme 516

Scheme 517

1. ACTIVE DTC Ignition on, engine not running. Using the scan tool, erase DTCs in the Powertrain Control Module (PCM). Using the scan tool, actuate the Oxygen Sensor Heater. Monitor the scan tool for at least two minutes. Using the scan tool, select View DTCs. Is the status Active for this DTC? Yes Go To 2 . No Perform the INTERMITTENT DTC diagnostic procedure. Refer to «INTERMITTENT DTC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
2. CHECK THE (K79) O2 SENSOR 1/1 HEATER CONTROL CIRCUIT FOR A SHORT TO GROUND Turn the ignition off. Disconnect the Oxygen Sensor harness connector. Disconnect the PCM C1 harness connector. Measure the resistance between ground and the (K79) O2 Sensor 1/1 Heater Control circuit in the Oxygen Sensor harness connector. Is the resistance above 10k Ohms? Yes Go To 3 . No Repair the (K79) O2 Sensor 1/1 Heater Control circuit for a short to ground. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
3. CHECK THE (K79) O2 SENSOR 1/1 HEATER CONTROL CIRCUIT FOR AN OPEN/HIGH RESISTANCE Measure the resistance of the (K79) O2 Sensor 1/1 Heater Control circuit between the Oxygen Sensor harness connector and the PCM C1 harness connector. Is the resistance below 5.0 Ohms? Yes Go To 4 . No Repair the (K79) O2 Sensor 1/1 Heater Control circuit for an open or high resistance. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
4. CHECK THE AIR FILTER Turn the ignition off. Remove and inspect the Air Filter for soiling or excessive dirt and debris which may cause air flow restriction. Check the Inlet Tube for signs of excessive dirt, snow, or ice restricting airflow into the Air Filter Box. Were any problems found? Yes Repair or replace as necessary. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Go To 5 .
5. CHECKING FOR INTAKE SYSTEM LEAK OR RESTRICTION Turn the ignition off. Perform a thorough inspection of the intake system. Look for any leaks or restrictions. Pay special attention to the Charge Air Cooler and hoses. Remove the Mass Air Flow Sensor from the inlet tube. Seal off and/or plug the where the MAF sensor was removed. Connect the smoke machine 84-04 to the intake system where possible and begin injecting smoke into the system. Observe all intake system components for evidence of smoke leakage. Were any leaks or restrictions found? Yes Repair the leak or restriction in the intake system. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Go To 6 .
6. CHECK FOR INTAKE SYSTEM AIR LEAKS Remove the Crankcase Vent Heater. Remove the Mass Air Flow Sensor from the Turbocharger Inlet Tube. Seal off and/or plug the Turbocharger Inlet Tube where the MAF sensor was removed. Connect the Evaporative Emissions Leak Detector (EELD) (special tool #8404B, Kit, EELD And Accessory) to the Crankcase Vent Heater port in the intake duct and begin injecting smoke into the intake system. Observe all intake system components for evidence of smoke leakage. Is there evidence of smoke leakage? Yes Repair or replace as necessary. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Go To 7 .
7. CHECK THE EXHAUST SYSTEM FOR LEAKS OR RESTRICTIONS Visually inspect the entire exhaust system for damage, leaks or restrictions. Were any problems found? Yes Repair as necessary. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Go To 8 .
8. CHECK THE FUEL DELIVERY SYSTEM Perform the CHECKING THE FUEL DELIVERY SYSTEM diagnostic procedure. Refer to «CHECKING THE FUEL DELIVERY SYSTEM»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#driveability-diesel-non-dtc-based-diagnostics__checking-the-fuel-delivery-system) . Were any problems found? Yes Repair as necessary. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Go To 9 .
9. OXYGEN SENSOR Turn the ignition off. Reconnect the PCM C1 harness connector. Replace the Oxygen Sensor in accordance with the service information. Refer to «SENSOR, OXYGEN, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . Start the engine. Allow the engine to reach normal operating temperature. Monitor the scan tool for at least two minutes. Using the scan tool, select View DTCs. Is the status Active for this DTC? Yes Go To 10 . No Repair complete. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
10. POWERTRAIN CONTROL MODULE Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Oxygen Sensor and the Powertrain Control Module (PCM). Look for any chafed, pierced, pinched or partially broken wires. Look for broken, bent, pushed out or corroded terminals. Perform any Technical Service Bulletins that may apply. Were any problems found? Yes Repair as necessary. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Replace the Powertrain Control Module in accordance with the service information. Refer to «MODULE, POWERTRAIN CONTROL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/communication-devices/#electronic-control-modules-service-information) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .

P0069-MANIFOLD ABSOLUTE PRESSURE / BAROMETRIC PRESSURE CORRELATION

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article .

The Barometric/Atmospheric Pressure Sensor is calculated from the Boost Pressure Sensor Signal. The Powertrain Control Module (PCM) compares the signal of the Inlet Pressure Sensor to the signal of the Boost Pressure Sensor during key on, engine off and during after-run mode to determine the plausibility of these sensors.

With the ignition on. There are no Sensor Reference Voltage DTCs. There are no other Boost Pressure related DTCs. There are no BARO Pressure Sensor DTCs.

The PCM detects a plausibility error between the Boost Pressure Sensor Signal and the BARO Pressure Sensor Signal for 6.0 seconds.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

1. DTC IS ACTIVE Ignition on, engine not running. With the scan tool, select View DTCs. Is the status Active for this DTC? Yes Go To 2 . No Perform the INTERMITTENT DTC diagnostic procedure. Refer to «INTERMITTENT DTC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
2. CHECK THE BOOST PRESSURE SENSOR CIRCUITS FOR AN OPEN/HIGH RESISTANCE Turn the ignition off. Disconnect the Boost Pressure/Intake Air Temperature Sensor harness connector. Disconnect the PCM C2 harness connector. Measure the resistance of the: (K668) Boost Pressure Sensor 5-Volt Supply circuit between the Boost Pressure/Intake Air Temperature Sensor harness connector and the PCM C2 harness connector. (K37) Boost Pressure Senor Signal circuit between the Boost Pressure/Intake Air Temperature Sensor harness connector and the PCM C2 harness connector. (K690) Boost Pressure Sensor Ground circuit between the Boost Pressure/Intake Air Temperature Sensor harness connector and the PCM C2 harness connector. Is the resistance below 5.0 Ohms for each measurement? Yes Go To 3 . No Repair the circuit that measured above 5.0 Ohms for an open or high resistance. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
3. BOOST PRESSURE SENSOR Reconnect the PCM C2 harness connector. Replace the Boost Pressure/Intake Air Temperature Sensor in accordance with the service information. Refer to «SENSOR, BOOST PRESSURE, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . Turn the ignition on. With the scan tool, erase DTCs. Turn the ignition off for 30 seconds. Turn the ignition on. With the scan tool, view DTCs. Did the DTC return? Yes Go To 4 . No Repair complete. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
4. POWERTRAIN CONTROL MODULE Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Boost Pressure Sensor and the Powertrain Control Module. Look for any chafed, pierced, pinched, or partially broken wires. Look for broken, bent, pushed out or corroded terminals. Perform any Technical Service Bulletins that may apply. Were any problems found? Yes Repair as necessary. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Replace the Powertrain Control Module in accordance with the service information. Refer to «MODULE, POWERTRAIN CONTROL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/communication-devices/#electronic-control-modules-service-information) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .

P0070-AMBIENT AIR TEMPERATURE SENSOR STUCK

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article .

The Ambient Air Temperature Sensor is a two wire sensor that is hard wired to the Totally Integrated Power Module (TIPM). The TIPM supplies a 5-Volt sensor signal and sensor ground to the Ambient Air Temperature Sensor. The sensor internal resistance changes in response to changes in ambient temperature. The TIPM provides the Powertrain Control Module (PCM) with ambient temperature over the CAN Bus network.

With the ignition on.

The Ambient Air Temperature Sensor signal over CAN Bus from the TIPM is implausible.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

1. DTC IS ACTIVE NOTE: The Ambient Air Temperature Sensor is hardwired to the TIPM. Ignition on, engine not running. With the scan tool, erase DTCs in the Powertrain Control Module (PCM). Monitor the scan tool for at least two minutes. Cycle the ignition key off and on several times, leaving the ignition on for at least 10 seconds at a time. With the scan tool, select View DTCs. Is the status Active for this DTC? Yes Refer to the service information to diagnose problem with Ambient Air Temperature Sensor or associated wiring and connectors. Refer to «DIAGNOSIS AND TESTING»(/jeep/grand-cherokee/wk2-2010-2013/remont/communication-devices/#totally-integrated-power-module-tipm-dtcs-b10b4-to-b25ae) . No Test Complete.

P0072-AMBIENT AIR TEMPERATURE SENSOR CIRCUIT LOW

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article .

The Ambient Air Temperature Sensor is a two wire sensor that is hard wired to the TIPM. The TIPM supplies a 5-Volt sensor signal and sensor ground to the Ambient Air Temperature Sensor. The sensor internal resistance changes in response to changes in ambient temperature. The TIPM provides the Powertrain Control Module (PCM) with ambient temperature over the CAN Bus network.

The ignition key on.

Ambient Temperature Sensor is less than the minimum acceptable value for 0.5 second. Three Trip Fault.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

Scheme 518

Scheme 519

1. ACTIVE DTC NOTE: Diagnose any CAN C Bus Communication DTCs before continuing. Turn the ignition one. With the scan tool, select View DTCs. Is the DTC active? Yes Go To 2 . No Perform the INTERMITTENT DTC diagnostic procedure. Refer to «INTERMITTENT DTC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
2. CHECKING AAT SENSOR Turn the ignition off. Disconnect the Ambient Air Temperature Sensor (AAT) harness connector. Turn the ignition on, engine not running. With a scan tool, select View DTCs. NOTE: The scan tool should display the P0073-AMBIENT AIR TEMPERATURE SENSOR CIRCUIT HIGH DTC with the connector disconnected. Does the scan tool display the DTC described above? Yes Verify that there is good pin to terminal contact in the AAT Sensor and TIPM connectors. If OK, replace the Ambient Air Temperature Sensor. Refer to «SENSOR, AMBIENT TEMPERATURE, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Go To 3 .
3. CHECK THE (G31) AAT SIGNAL CIRCUIT FOR A SHORT TO GROUND Turn the ignition off. Disconnect the TIPM C4 harness connector. Measure the resistance between ground and the (G31) AAT Signal circuit in the AAT Sensor harness connector. Is the resistance above 10k Ohms? Yes Go To 4 . No Repair the (G31) AAT Signal circuit for a short to ground. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
4. CHECK FOR THE (G31) AAT SIGNAL CIRCUIT SHORTED TO THE (G931) SENSOR GROUND CIRCUIT Measure the resistance between the (G931) Sensor ground circuit and the (G31) AAT Signal circuit in the AAT Sensor harness connector. Is the resistance above 10k Ohms? Yes Go To 5 . No Repair the short between the (G931) Sensor ground circuit and the (G31) AAT Signal circuit. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
5. TOTALLY INTEGRATED POWER MODULE (TIPM) Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the AAT Sensor and the Totally Integrated Power Module (TIPM). Look for any chafed, pierced, pinched or partially broken wires. Look for broken, bent, pushed out or corroded terminals. Verify that there is good pin to terminal contact in the AAT Sensor and Totally Integrated Power Module connectors. Perform any Technical Service Bulletins that may apply. Were there any problems found? Yes Repair as necessary. Perform the BODY VERIFICATION TEST. Refer to «STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/communication-devices/#totally-integrated-power-module-tipm-body-verification-test) . No Replace and program the Totally Integrated Power Module (TIPM) in accordance with the service information. Refer to «MODULE, TOTALLY INTEGRATED POWER (TIPM), REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/communication-devices/#electronic-control-modules-service-information) . Perform the BODY VERIFICATION TEST. Refer to «STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/communication-devices/#totally-integrated-power-module-tipm-body-verification-test) .

P0073-AMBIENT AIR TEMPERATURE SENSOR CIRCUIT HIGH

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article .

The Ambient Air Temperature Sensor is a two wire sensor that is hard wired to the Totally Integrated Power Module (TIPM). The TIPM supplies a 5 Volt sensor signal and sensor ground to the Ambient Air Temperature Sensor. The sensor internal resistance changes in response to changes in ambient temperature. The TIPM provides the Powertrain Control Module (PCM) with ambient temperature over the CAN Bus network.

With the ignition on. Battery voltage greater than 10 Volts.

The Ambient Air Temperature Sensor voltage is greater than the maximum allowable voltage for 0.5 second.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

Scheme 520

Scheme 521

Scheme 522

Scheme 523

1. ACTIVE DTC NOTE: Diagnose any CAN C Bus Communication DTCs before continuing. Turn the ignition one. With the scan tool, select View DTCs. Is the DTC active? Yes Go To 2 . No Perform the INTERMITTENT DTC diagnostic procedure. Refer to «INTERMITTENT DTC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
2. CHECK THE (G31) AAT SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE Turn the ignition off. Disconnect the Ambient Air Temperature Sensor (AAT) harness connector. Turn the ignition on, engine not running. Measure the voltage on the (G31) AAT Signal circuit in the AAT Sensor harness connector. Is the voltage above 5.2 volts? Yes Repair the (G31) AAT Signal circuit for a short to voltage. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Go To 3 .
3. CHECK THE (G31) AAT SIGNAL CIRCUIT FOR AN OPEN/HIGH RESISTANCE Turn the ignition off. Disconnect the TIPM C4 harness connector. Measure the resistance of the (G31) AAT Signal circuit between the AAT Sensor harness connector and the TIPM C4 harness connector. Is the resistance below 5.0 Ohms? Yes Go To 4 . No Repair the (G31) AAT Signal circuit for an open or high resistance. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
4. CHECK THE (G931) SENSOR GROUND CIRCUIT FOR AN OPEN/HIGH RESISTANCE Measure the resistance of the (G931) Sensor Ground circuit from the AAT Sensor harness connector to the C4 TIPM harness connector. Is the resistance below 5.0 Ohms? Yes Go To 5 . No Repair the (G931) Sensor Ground circuit for an open or high resistance. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
5. CHECK THE AAT SENSOR Reconnect the C4 TIPM harness connector. Connect a jumper wire between the (G31) AAT Signal circuit and the (G931) Sensor Ground circuit in the AAT Sensor harness connector. Turn the ignition on, engine not running. With a scan tool, select View DTCs. NOTE: The scan tool should display the P0072-AMBIENT AIR TEMPERATURE SENSOR CIRCUIT LOW DTC as active or pending with the jumper in place. Does the scan tool display the voltage as described above? Yes Verify that there is good pin to terminal contact in the AAT Sensor and Totally Integrated Power Module (TIPM) connectors. If OK, replace the Ambient Air Temperature Sensor. Refer to «SENSOR, AMBIENT TEMPERATURE, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/ac-compressor/#heating-air-conditioning-service-information) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Go To 6 .
6. TOTALLY INTEGRATED POWER MODULE (TIPM) Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the AAT Sensor and the Totally Integrated Power Module (TIPM). Look for any chafed, pierced, pinched or partially broken wires. Look for broken, bent, pushed out or corroded terminals. Verify that there is good pin to terminal contact in the AAT Sensor and Totally Integrated Power Module connectors. Perform any Technical Service Bulletins that may apply. Were there any problems found? Yes Repair as necessary. Perform the BODY VERIFICATION TEST. Refer to «STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/communication-devices/#totally-integrated-power-module-tipm-body-verification-test) . No Replace the Totally Integrated Power Module (TIPM) in accordance with the service information. Refer to «MODULE, TOTALLY INTEGRATED POWER (TIPM), REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/communication-devices/#electronic-control-modules-service-information) . Perform the BODY VERIFICATION TEST. Refer to «STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/communication-devices/#totally-integrated-power-module-tipm-body-verification-test) .

P0087-FUEL RAIL PRESSURE TOO LOW

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article .

With the engine running.

The Powertrain Control Module (PCM) determines that the fuel rail pressure is too low for a given engine speed and load.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

1. CHECKING FOR OTHER PCM DTCS Turn the ignition on. With the scan tool, read the PCM DTCs. Are there any other DTCs present? Yes Repair the other DTCs before continuing. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Go To 2 .
2. CURRENT DTC Turn the ignition on. With the scan tool, erase the PCM DTCs. Test drive the vehicle under various load and speed conditions to attempt to duplicate the fault. With the scan tool, read the PCM DTCs. Did the DTC return? Yes Go To 3 . No Perform the INTERMITTENT DTC diagnostic procedure. Refer to «INTERMITTENT DTC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
3. FUEL SYSTEM LEAK Turn the ignition off. Visually inspect the entire fuel system for signs of a leak. Is there any evidence of leakage? Yes Repair as necessary in accordance with the service information. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Go To 4 .
4. FUEL SYSTEM CONTAMINATION NOTE: Mixing any other fuels such as gasoline or kerosine can cause this DTC to set. Inspect the fuel system for contamination. Is the fuel contaminated? Yes Repair as necessary in accordance with the service information. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Go To 4 .
5. ATTEMPT TO START ENGINE With the scan tool, erase the PCM DTCs. Attempt to start the engine. Does the engine start and idle? Yes Go To 6 . No Go To 9 .
6. FUEL PRESSURE REGULATOR With the scan tool, compare the Fuel Pressure Setpoint with the Actual Fuel Pressure. NOTE: A sticking Fuel Pressure Regulator is indicated by the Actual Fuel Pressure gradually dropping below the Fuel Pressure Setpoint then suddenly increasing (spiking) above the Fuel Pressure Setpoint. Does the Actual Fuel Pressure gradually decrease then suddenly increase (spike) above the Fuel Pressure Setpoint? Yes Replace the Fuel Rail Assembly in accordance with the service information. Refer to «RAIL, FUEL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Go To 7 .
7. CHECKING FUEL DELIVERY SYSTEM Perform the CHECKING THE FUEL DELIVERY SYSTEM diagnostic procedure. Refer to «CHECKING THE FUEL DELIVERY SYSTEM»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#driveability-diesel-non-dtc-based-diagnostics__checking-the-fuel-delivery-system) . Were there any problems with the Fuel Delivery System? Yes Repair as necessary in accordance with the service information. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Go To 8 .
8. FUEL INJECTORS NOTE: An injector that sticks open can cause this DTC. A sticking injector will cause the engine to misfire and emit excessive black smoke from the exhaust system. Does the engine exhibit the symptoms described in the above note? Yes Using the service information, remove and inspect the Fuel Injectors for signs of damage or debris that may cause the injector to stick. Sticking injectors may cause the combustion chamber to become black and oil soaked. Replace Fuel Injectors as necessary. Refer to «INJECTOR(S), FUEL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Replace the High Pressure Delivery Pump in accordance with the service information. Refer to «PUMP, FUEL INJECTION, HIGH PRESSURE, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
9. CHECKING FUEL DELIVERY SYSTEM Perform the CHECKING THE FUEL DELIVERY SYSTEM diagnostic procedure. Refer to «CHECKING THE FUEL DELIVERY SYSTEM»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#driveability-diesel-non-dtc-based-diagnostics__checking-the-fuel-delivery-system) . Were there any problems with the Fuel Delivery System? Yes Repair as necessary in accordance with the service information. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Go To 10 .
10. FUEL PRESSURE REGULATOR Turn the ignition off. Replace the Fuel Rail Assembly in accordance with the service information. Refer to «RAIL, FUEL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . Turn the ignition on. With the scan tool, erase the PCM DTCs. Attempt to start and test drive the vehicle. With the scan tool, read the PCM DTCs. Did the DTC return? Yes Replace the High Pressure Delivery Pump in accordance with the service information. Refer to «PUMP, FUEL INJECTION, HIGH PRESSURE, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Test Complete. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .

P0088-FUEL RAIL PRESSURE TOO HIGH

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article .

With the engine running.

The Powertrain Control Module (PCM) determines that the fuel rail pressure is too high for a given engine speed and load.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

1. CHECKING FOR OTHER PCM DTCS Turn the ignition on. With the scan tool, read the PCM DTCs. Are there any other DTCs present? Yes Repair the other DTCs before continuing. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Go To 2 .
2. CURRENT DTC Turn the ignition on. With the scan tool, erase the PCM DTCs. Test drive the vehicle under various load and speed conditions to attempt to duplicate the fault. With the scan tool, read the PCM DTCs. Did the DTC return? Yes Go To 3 . No Perform the INTERMITTENT DTC diagnostic procedure. Refer to «INTERMITTENT DTC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
3. FUEL SYSTEM LEAK Turn the ignition off. Inspect the entire fuel system for leakage. Is there any evidence of leakage? Yes Repair as necessary in accordance with the service information. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Go To 4 .
4. FUEL SYSTEM CONTAMINATION Inspect the fuel system for contamination. Is the fuel contaminated? Yes Repair as necessary in accordance with the service information. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Go To 5 .
5. ATTEMPT TO START ENGINE With the scan tool, erase the PCM DTCs. Attempt to start the engine. Does the engine start and idle? Yes Go To 6 . No Go To 10 .
6. FUEL PRESSURE REGULATOR With the scan tool, compare the Fuel Pressure Setpoint with the Actual Fuel Pressure. NOTE: A sticking Fuel Pressure Regulator is indicated by the Actual Fuel Pressure gradually dropping below the Fuel Pressure Setpoint then suddenly increasing (spiking) above the Fuel Pressure Setpoint. Does the Actual Fuel Pressure gradually decrease then suddenly increase (spike) above the Fuel Pressure Setpoint? Yes Replace the Fuel Rail Assembly in accordance with the service information. Refer to «RAIL, FUEL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Go To 7 .
7. CHECKING FUEL DELIVERY SYSTEM Perform the CHECKING THE FUEL DELIVERY SYSTEM diagnostic procedure. Refer to «CHECKING THE FUEL DELIVERY SYSTEM»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#driveability-diesel-non-dtc-based-diagnostics__checking-the-fuel-delivery-system) . Were there any problems with the Fuel Delivery System? Yes Repair as necessary in accordance with the service information. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Go To 8 .
8. FUEL INJECTOR(S) NOTE: An injector that sticks open can cause this DTC. A sticking injector will cause the engine to misfire and emit excessive black smoke from the exhaust system. Does the engine exhibit the symptoms described in the above note? Yes Using the service information, remove and inspect the Fuel Injectors for signs of damage or debris that may cause the injector to stick. Sticking injectors may cause the combustion chamber to become black and oil soaked. Replace Injector(s) as necessary. Refer to «INJECTOR(S), FUEL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Go To 9 .
9. FUEL PRESSURE REGULATOR Turn the ignition off. Replace the Fuel Rail Assembly in accordance with the service information. Refer to «RAIL, FUEL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . Turn the ignition on. With the scan tool, erase the PCM DTCs. Attempt to start and test drive the vehicle. With the scan tool, read the PCM DTCs. Did the DTC return? Yes Replace the High Pressure Delivery Pump in accordance with the service information. Refer to «PUMP, FUEL INJECTION, HIGH PRESSURE, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Test Complete.
10. CHECKING FUEL DELIVERY SYSTEM Perform the CHECKING THE FUEL DELIVERY SYSTEM diagnostic procedure. Refer to «CHECKING THE FUEL DELIVERY SYSTEM»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#driveability-diesel-non-dtc-based-diagnostics__checking-the-fuel-delivery-system) . Were there any problems with the Fuel Delivery System? Yes Repair as necessary in accordance with the service information. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Go To 11 .
11. FUEL QUANTITY SOLENOID Turn the ignition off. Replace the Fuel Quantity Solenoid in accordance with the service information. Refer to «SOLENOID, FUEL QUANTITY, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . Turn the ignition on. With the scan tool, erase the PCM DTCs. Attempt to start and test drive the vehicle. With the scan tool, read the PCM DTCs. Did the DTC return? Yes Go To 12 . No Test Complete. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
12. FUEL PRESSURE REGULATOR Turn the ignition off. Replace the Fuel Rail Assembly in accordance with the service information. Refer to «RAIL, FUEL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . Turn the ignition on. With the scan tool, erase the PCM DTCs. Attempt to start and test drive the vehicle. With the scan tool, read the PCM DTCs. Did the DTC return? Yes Replace the High Pressure Delivery Pump in accordance with the service information. Refer to «PUMP, FUEL INJECTION, HIGH PRESSURE, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Test Complete. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .

Scheme 524

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article .

The Fuel Quantity Solenoid (FQS) works in tandem with the Fuel Pressure Regulator (FPR) to control fuel volume and pressure in the Fuel Rail. The FQS is positioned in the inlet side of the High Pressure Delivery Pump (HPDP). The FQS receives 12 Volts and a duty-cycle ground signal from the Powertrain Control Module (PCM). The FQS is normally open, so when the FQS is not actuated (no ground signal from the PCM), the HPDP inlet passage is open allowing full fuel flow to the pumping chambers inside the HPDP. When the PCM grounds the FQS control signal the FQS closes the fuel inlet passage, preventing fuel from entering the pumping chambers. The FPR is positioned at the return passage of the Fuel Rail. The solenoid receives 12 Volts from the TIPM and a duty-cycle ground signal from the PCM. The FPR is normally open and when the solenoid is not actuated (no ground signal from the PCM), the Fuel Rail return passage opens allowing fuel pressure in the rail to escape into the return circuit and on to the Fuel Tank. When the PCM grounds the FPR control signal, the solenoid valve closes allowing fuel pressure to build in the rail. The Fuel Pressure Regulator is not serviceable separate of the Fuel Rail Assembly.

With the ignition on.

The Powertrain Control Module (PCM) detects an over temperature condition on the Fuel Pressure Regulator driver circuit for 0.28 second.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

Scheme 525

Scheme 526

1. DTC IS ACTIVE Ignition on, engine not running. With the scan tool, select View DTCs. Is the status Active for this DTC? Yes Go To 2 . No Perform the INTERMITTENT DTC diagnostic procedure. Refer to «INTERMITTENT DTC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
2. CHECK FOR HIGH RESISTANCE ON THE (K646) FUEL PRESSURE REGULATOR CONTROL CIRCUIT Turn the ignition off. Disconnect the Fuel Pressure Regulator harness connector. Disconnect the PCM C2 harness connector. Measure the resistance of the (K646) Fuel Pressure Regulator Control circuit between the Fuel Pressure Regulator harness connector and the PCM C2 harness connector. Is the resistance below 5.0 Ohms? Yes Go To 3 . No Repair the (K646) Fuel Pressure Regulator Control circuit for an open or high resistance. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
3. CHECK FOR HIGH RESISTANCE ON THE (K369) FUEL PRESSURE REGULATOR RETURN CIRCUIT Measure the resistance of the (K369) Fuel Pressure Regulator Return circuit between the Fuel Pressure Regulator harness connector and the PCM C2 harness connector. Is the resistance below 5.0 Ohms? Yes Go To 4 . No Repair the (K369) Fuel Pressure Regulator Return circuit for an open or high resistance. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
4. FUEL PRESSURE REGULATOR Reconnect the Fuel Pressure Regulator harness connector. Reconnect the Powertrain Control Module C2 harness connector. Turn the ignition on. With the scan tool, erase DTCs. Turn the ignition off. Disconnect the Fuel Pressure Regulator harness connector. Connect a jumper between the (K646) Fuel Pressure Regulator Control circuit and ground. Turn the ignition on. With the scan tool, select View DTCs. NOTE: The scan tool should display a P0091-FUEL PRESSURE CONTROL CIRCUIT LOW DTC with the jumper in place. Did the scan tool display the DTC as described above? Yes Replace the Fuel Pressure Regulator in accordance with the service information. Refer to «SOLENOID, FUEL PRESSURE, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Go To 5 .
5. POWERTRAIN CONTROL MODULE Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Fuel Pressure Regulator and the Powertrain Control Module (PCM). Look for any chafed, pierced, pinched, or partially broken wires. Look for broken, bent, pushed out or corroded terminals. Perform any Technical Service Bulletins that may apply. Were any problems found? Yes Repair as necessary. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Replace and program the Powertrain Control Module in accordance the service information. Refer to «MODULE, POWERTRAIN CONTROL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/communication-devices/#electronic-control-modules-service-information) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .

P0090-FUEL PRESSURE 1 CONTROL CIRCUIT/OPEN

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article .

The Fuel Quantity Solenoid (FQS) works in tandem with the Fuel Pressure Regulator (FPR) to control fuel volume and pressure in the Fuel Rail. The FQS is positioned in the inlet side of the High Pressure Delivery Pump (HPDP). The FQS receives 12 Volts and a duty-cycle ground signal from the Powertrain Control Module (PCM). The FQS is normally open, so when the FQS is not actuated (no ground signal from the PCM), the HPDP inlet passage is open allowing full fuel flow to the pumping chambers inside the HPDP. When the PCM grounds the FQS control signal the FQS closes the fuel inlet passage, preventing fuel from entering the pumping chambers. The FPR is positioned at the return passage of the Fuel Rail. The solenoid receives 12 Volts from the TIPM and a duty-cycle ground signal from the PCM. The FPR is normally open and when the solenoid is not actuated (no ground signal from the PCM), the Fuel Rail return passage opens allowing fuel pressure in the rail to escape into the return circuit and on to the Fuel Tank. When the PCM grounds the FPR control signal, the solenoid valve closes allowing fuel pressure to build in the rail. The Fuel Pressure Regulator is not serviceable separate of the Fuel Rail Assembly.

With the ignition on.

The Powertrain Control Module (PCM) detects that the Fuel Pressure Regulator driver circuit is open for 0.28 second.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

1. DTC IS ACTIVE Ignition on, engine not running. With the scan tool, select View DTCs. Is the status Active for this DTC? Yes Go To 2 . No Perform the INTERMITTENT DTC diagnostic procedure. Refer to «INTERMITTENT DTC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
2. CHECK THE (K646) FUEL PRESSURE REGULATOR CONTROL CIRCUIT FOR AN OPEN/HIGH RESISTANCE Turn the ignition off. Disconnect the Fuel Pressure Regulator harness connector. Disconnect the PCM C2 harness connector. Measure the resistance of the (K646) Fuel Pressure Regulator Control circuit between the Fuel Pressure Regulator harness connector and the PCM C2 harness connector. Is the resistance below 5.0 Ohms? Yes Go To 3 . No Repair the (K646) Fuel Pressure Regulator Control circuit for an open or high resistance. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
3. CHECK THE (K369) FUEL PRESSURE REGULATOR RETURN CIRCUIT FOR AN OPEN/HIGH RESISTANCE Measure the resistance of the (K369) Fuel Pressure Regulator Return circuit between the Fuel Pressure Regulator harness connector and the PCM C2 harness connector. Is the resistance below 5.0 Ohms? Yes Go To 4 . No Repair the (K369) Fuel Pressure Regulator Return circuit for an open or high resistance. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
4. FUEL PRESSURE REGULATOR Reconnect the Fuel Pressure Regulator harness connector. Reconnect the Powertrain Control Module C2 harness connector. Turn the ignition on. With the scan tool, erase DTCs. Turn the ignition off. Disconnect the Fuel Pressure Regulator harness connector. Connect a jumper between the (K646) Fuel Pressure Regulator Control circuit and ground. Turn the ignition on. With the scan tool, select View DTCs. NOTE: The scan tool should display a P0091-FUEL PRESSURE CONTROL CIRCUIT LOW DTC with the jumper in place. Did the scan tool display the DTC as described above? Yes Replace the Fuel Pressure Regulator in accordance with the service information. Refer to «SOLENOID, FUEL PRESSURE, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Go To 5 .
5. POWERTRAIN CONTROL MODULE Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Fuel Pressure Regulator and the Powertrain Control Module (PCM). Look for any chafed, pierced, pinched, or partially broken wires. Look for broken, bent, pushed out or corroded terminals. Perform any Technical Service Bulletins that may apply. Were any problems found? Yes Repair as necessary. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Replace and program the Powertrain Control Module in accordance the service information. Refer to «MODULE, POWERTRAIN CONTROL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/communication-devices/#electronic-control-modules-service-information) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .

P0091-FUEL PRESSURE 1 CONTROL CIRCUIT LOW

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article .

The Fuel Quantity Solenoid (FQS) works in tandem with the Fuel Pressure Regulator (FPR) to control fuel volume and pressure in the Fuel Rail. The FQS is positioned in the inlet side of the High Pressure Delivery Pump (HPDP). The FQS receives 12 Volts and a duty-cycle control ground from the Powertrain Control Module (PCM). The FQS is normally open, so when the FQS is not actuated (no ground signal from the PCM), the HPDP inlet passage is open allowing full fuel flow to the pumping chambers inside the HPDP. When the PCM grounds the FQS control signal the FQS closes the fuel inlet passage, preventing fuel from entering the pumping chambers. The FPR is positioned at the return passage of the Fuel Rail. The solenoid receives 12 Volts from the TIPM and a duty-cycle ground signal from the PCM. The FPR is normally open and when the solenoid is not actuated (no ground signal from the PCM), the Fuel Rail return passage opens allowing fuel pressure in the rail to escape into the return circuit and on to the Fuel Tank. When the PCM grounds the FPR control signal, the solenoid valve closes allowing fuel pressure to build in the rail. The Fuel Pressure Regulator is not serviceable separate of the Fuel Rail Assembly.

With the ignition on and the Fuel Pressure Regulator commanded off.

The PCM detects that the (K646) Fuel Pressure Regulator Control circuit is shorted to ground for 0.22 second.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

Scheme 527

Scheme 528

1. DTC IS ACTIVE Ignition on, engine not running. With the scan tool, select View DTCs. Is the status Active for this DTC? Yes Go To 2 . No Perform the INTERMITTENT DTC diagnostic procedure. Refer to «INTERMITTENT DTC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
2. CHECK THE (K646) FUEL PRESSURE REGULATOR CONTROL CIRCUIT FOR A SHORT TO GROUND Turn the ignition off. Disconnect the Fuel Pressure Regulator harness connector. Disconnect the PCM C2 harness connector. Measure the resistance between ground and the (K646) Fuel Pressure Regulator Control circuit in the Fuel Pressure Regulator harness connector. Is the resistance above 10k Ohms? Yes Go To 3 . No Repair the (K646) Fuel Pressure Regulator Control circuit for a short to ground. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
3. CHECK FOR THE (K646) FUEL PRESSURE REGULATOR CONTROL CIRCUIT FOR A SHORT TO THE (K369) FUEL PRESSURE REGULATOR RETURN CIRCUIT Measure the resistance between the (K646) Fuel Pressure Regulator Control circuit and the (K369) Fuel Pressure Regulator Return circuit at the Fuel Pressure Regulator harness connector. Is the resistance above 10k Ohms? Yes Go To 4 . No Repair the (K646) Fuel Pressure Regulator Control circuit for a short to ground. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
4. FUEL PRESSURE REGULATOR Reconnect the Fuel Pressure Regulator harness connector. Reconnect the Powertrain Control Module C2 harness connector. Turn the ignition on. With the scan tool, erase DTCs. Turn the ignition off. Disconnect the Fuel Pressure Regulator harness connector. Turn the ignition on. With the scan tool, select View DTCs. NOTE: The scan tool should display a P0090-FUEL PRESSURE CONTROL CIRCUIT OPEN DTC as active or pending with the connector disconnected. Did the scan tool display the DTC as described above? Yes Replace the Fuel Pressure Regulator in accordance with the service information. Refer to «SOLENOID, FUEL PRESSURE, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Go To 5 .
5. POWERTRAIN CONTROL MODULE Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Fuel Pressure Regulator and the Powertrain Control Module (PCM). Look for any chafed, pierced, pinched, or partially broken wires. Look for broken, bent, pushed out or corroded terminals. Perform any Technical Service Bulletins that may apply. Were any problems found? Yes Repair as necessary. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Replace and program the Powertrain Control Module in accordance the service information. Refer to «MODULE, POWERTRAIN CONTROL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/communication-devices/#electronic-control-modules-service-information) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .

P0092-FUEL PRESSURE 1 CONTROL CIRCUIT HIGH

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article .

The Fuel Quantity Solenoid (FQS) works in tandem with the Fuel Pressure Regulator (FPR) to control fuel volume and pressure in the Fuel Rail. The FQS is positioned in the inlet side of the High Pressure Delivery Pump (HPDP). The FQS receives 12 Volts and a duty-cycle ground signal from the Powertrain Control Module (PCM). The FQS is normally open, so when the FQS is not actuated (no ground signal from the PCM), the HPDP inlet passage is open allowing full fuel flow to the pumping chambers inside the HPDP. When the PCM grounds the FQS control signal the FQS closes the fuel inlet passage, preventing fuel from entering the pumping chambers. The FPR is positioned at the return passage of the Fuel Rail. The solenoid receives 12 Volts from the TIPM and a duty-cycle ground signal from the PCM. The FPR is normally open and when the solenoid is not actuated (no ground signal from the PCM), the Fuel Rail return passage opens allowing fuel pressure in the rail to escape into the return circuit and on to the Fuel Tank. When the PCM grounds the FPR control signal, the solenoid valve closes allowing fuel pressure to build in the rail. The Fuel Pressure Regulator is not serviceable separate of the Fuel Rail Assembly.

With the ignition on and the Fuel Pressure Regulator command on.

The PCM detects excessive current on the (K646) Fuel Pressure Regulator Control circuit for 0.28 second.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

Scheme 529

1. DTC IS ACTIVE Ignition on, engine not running. With the scan tool, select View DTCs. Is the status Active for this DTC? Yes Go To 2 . No Perform the INTERMITTENT DTC diagnostic procedure. Refer to «INTERMITTENT DTC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
2. CHECK THE (K646) FUEL PRESSURE REGULATOR CONTROL CIRCUIT FOR A SHORT TO VOLTAGE Turn the ignition off. Disconnect the Fuel Pressure Regulator harness connector. Disconnect the Powertrain Control Module C2 harness connector. Remove the ASD Relay from the TIPM. Connect a jumper wire between cavity 30 and cavity 87 of the ASD Relay Connector. Turn the ignition on. Measure the voltage of the (K646) Fuel Pressure Regulator Control circuit in the Fuel Pressure Regulator harness connector. Is there any voltage present? Yes Repair the (K646) Fuel Pressure Regulator Control circuit for a short to voltage. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Go To 3 .
3. FUEL PRESSURE REGULATOR Reconnect the Fuel Pressure Regulator harness connector. Reinstall the ASD Relay. Reconnect the Powertrain Control Module C2 harness connector. Turn the ignition on. With the scan tool, erase DTCs. Turn the ignition off. Disconnect the Fuel Pressure Regulator harness connector. Turn the ignition on. With the scan tool, select View DTCs. Connect a jumper between the (K646) Fuel Pressure Regulator Control circuit and ground. NOTE: The scan tool should display a P0090-FUEL PRESSURE CONTROL CIRCUIT OPEN DTC with the connector unplugged and a P0091-FUEL PRESSURE CONTROL CIRCUIT LOW DTC with the jumper in place. Did the scan tool display the DTCs as described above? Yes Replace the Fuel Pressure Regulator in accordance with the service information. Refer to «SOLENOID, FUEL PRESSURE, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Go To 4 .
4. POWERTRAIN CONTROL MODULE Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Fuel Pressure Regulator and the Powertrain Control Module (PCM). Look for any chafed, pierced, pinched, or partially broken wires. Look for broken, bent, pushed out or corroded terminals. Perform any Technical Service Bulletins that may apply. Were any problems found? Yes Repair as necessary. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Replace and program the Powertrain Control Module in accordance the service information. Refer to «MODULE, POWERTRAIN CONTROL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/communication-devices/#electronic-control-modules-service-information) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .

Scheme 530

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article .

The Intake Air Temperature Sensor 2 is combined with the Boost Pressure Sensor. It is located on the hose leading into the EGR Airflow Control Valve and is used to monitor the temperature of the air entering the Intake Manifold. The Intake Air Temperature Sensor 2 operates as a typical two wire sensor. It receives a 5-Volt signal on the (K48) Intake Air Temperature Sensor 2 Signal circuit and shares the (K690) ground circuit with the Boost Pressure Sensor.

With the ignition on.

The (K48) Intake Air Temperature Sensor 2 Signal circuit voltage is below the calibrated threshold for two seconds.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

Scheme 531

Scheme 532

1. DTC IS ACTIVE Ignition on, engine not running. With the scan tool, erase DTCs in the PCM. Monitor the scan tool for at least two minutes. Cycle the ignition key off and on several times, leaving the ignition on for at least 10 seconds at a time. With the scan tool, select View DTCs. Is the status Active for this DTC? Yes Go To 2 . No Perform the INTERMITTENT DTC diagnostic procedure. Refer to «INTERMITTENT DTC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
2. BOOST PRESSURE/INTAKE AIR TEMPERATURE SENSOR 2 Turn the ignition off. Disconnect the Boost Pressure/Intake Air Temperature Sensor 2 harness connector. Turn the ignition on. With the scan tool, select View DTCs. NOTE: The scan tool should display a P0098-Intake Air Temperature Sensor 2 High DTC as active with the connector disconnected. Does the scan tool display the DTC as described above? Yes Replace the Boost Pressure/Intake Air Temperature Sensor 2 in accordance with the service information. Refer to «SENSOR, BOOST PRESSURE, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Go To 3 .
3. CHECK THE (K48) INTAKE AIR TEMPERATURE SENSOR 2 SIGNAL CIRCUIT FOR A SHORT TO GROUND Turn the ignition off. Disconnect the PCM C1 harness connector. Measure the resistance between ground and the (K48) Intake Air Temperature Sensor 2 Signal circuit at the Boost Pressure/Intake Air Temperature Sensor 2 harness connector. Is the resistance above 10k Ohms? Yes Go To 4 . No Repair the (K48) Intake Air Temperature Sensor 2 Signal circuit for a short to ground. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
4. CHECK FOR THE (K48) INTAKE AIR TEMPERATURE SENSOR 2 SIGNAL CIRCUIT SHORTED TO (K690) BOOST PRESSURE/INTAKE AIR TEMPERATURE SENSOR 2 GROUND CIRCUIT Measure the resistance between the (K48) Intake Air Temperature Sensor 2 Signal circuit and the (K690) Boost Pressure/Intake Air Temperature Sensor 2 Ground circuit at the Boost Pressure/Intake Air Temperature Sensor 2 harness connector. Is the resistance above 10k Ohms? Yes Go To 5 . No Repair the (K48) Intake Air Temperature Sensor 2 Signal circuit for a short to the (K690) Boost Pressure/Intake Air Temperature Sensor 2 Ground circuit. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
5. POWERTRAIN CONTROL MODULE Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Intake Air Temperature Sensor 2 and the Powertrain Control Module (PCM). Look for any chafed, pierced, pinched, or partially broken wires. Look for broken, bent, pushed out or corroded terminals. Monitor the scan tool data relative to this circuit and wiggle test the wiring and connectors. Look for the data to change or for the DTC to reset during the wiggle test. Perform any Technical Service Bulletins that may apply. Were any problems found? Yes Repair as necessary. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Replace the Powertrain Control Module in accordance with the service information. Refer to «MODULE, POWERTRAIN CONTROL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/communication-devices/#electronic-control-modules-service-information) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .

P0098-INTAKE AIR TEMPERATURE SENSOR 2 CIRCUIT HIGH

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article .

The Intake Air Temperature Sensor 2 is combined with the Boost Pressure Sensor. It is located on the hose leading into the EGR Airflow Control Valve and is used to monitor the temperature of the air entering the Intake Manifold. The Intake Air Temperature Sensor 2 operates as a typical two wire sensor. It receives a 5-Volt signal on the (K48) Intake Air Temperature Sensor 2 Signal circuit and shares the (K690) ground circuit with the Boost Pressure Sensor. When this fault code is active the EGR system and DPF regeneration will be disabled.

With the ignition on.

The (K48) Intake Air Temperature Sensor 2 Signal circuit voltage is above the calibrated threshold for two seconds.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

Scheme 533

Scheme 534

Scheme 535

1. DTC IS ACTIVE Ignition on, engine not running. With the scan tool, erase DTCs in the PCM. Monitor the scan tool for at least two minutes. Cycle the ignition key off and on several times, leaving the ignition on for at least 10 seconds at a time. With the scan tool, select View DTCs. Is the status Active for this DTC? Yes Go To 2 . No Perform the INTERMITTENT DTC diagnostic procedure. Refer to «INTERMITTENT DTC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
2. CHECK THE (K48) INTAKE AIR TEMPERATURE SENSOR 2 SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE Turn the ignition off. Disconnect the Boost Pressure/Intake Air Temperature Sensor 2 harness connector. Turn the ignition on. Measure the voltage of the (K48) Intake Air Temperature Sensor Signal circuit in the Boost Pressure/Intake Air Temperature Sensor 2 harness connector. Does the voltage read above 5.2 volts? Yes Repair the (K48) Intake Air Temperature Sensor 2 Signal circuit for a short to voltage. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Go To 3 .
3. CHECK THE (K48) INTAKE AIR TEMPERATURE SENSOR 2 SIGNAL FOR AN OPEN/HIGH RESISTANCE Turn the ignition off. Disconnect the PCM C1 harness connector. Measure the resistance of the (K48) Intake Air Temperature Sensor 2 Signal circuit between the Boost Pressure/Intake Air Temperature Sensor 2 harness connector and the PCM C1 harness connector. Is the resistance below 5.0 Ohms? Yes Go To 4 . No Repair the (K48) Intake Air Temperature Sensor 2 Signal circuit for an open or high resistance. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
4. CHECK THE (K690) INTAKE AIR TEMPERATURE SENSOR 2 GROUND CIRCUIT FOR AN OPEN/HIGH RESISTANCE Measure the resistance of the (K690) Intake Air Temperature Sensor 2 Ground circuit between the Boost Pressure/Intake Air Temperature Sensor 2 harness connector and the PCM C1 harness connector. Is the resistance below 5.0 Ohms? Yes Go To 5 . No Repair the (K690) Intake Air Temperature Sensor 2 Ground circuit for an open or high resistance. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
5. BOOST PRESSURE/INTAKE AIR TEMPERATURE SENSOR 2 Turn the ignition off. Reconnect the Boost Pressure/Intake Air Temperature Sensor 2 harness connector. Reconnect the PCM C1 harness connector. Turn the ignition on. With the scan tool, erase DTCs. Turn the ignition off. Disconnect the Boost Pressure/Intake Air Temperature Sensor harness connector. Connect a jumper between the (K690) Boost Pressure/Intake Air Temperature Sensor 2 Ground circuit and the (K48) Intake Air Temperature Sensor 2 Signal circuit at the Boost Pressure/Intake Air Temperature Sensor harness connector. Turn the ignition on. With the scan tool, select View DTCs. NOTE: The scan tool should display a P0097-Intake Air Temperature Sensor Low DTC as active with the jumper wire in place. Does the scan tool display the DTC as described above? Yes Replace the Boost Pressure/Intake Air Temperature Sensor 2 in accordance with the service information. Refer to «SENSOR, BOOST PRESSURE, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Go To 6 .
6. POWERTRAIN CONTROL MODULE Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Intake Air Temperature Sensor 2 and the Powertrain Control Module (PCM). Look for any chafed, pierced, pinched, or partially broken wires. Look for broken, bent, pushed out or corroded terminals. Perform any Technical Service Bulletins that may apply. Were any problems found? Yes Repair as necessary. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Replace the Powertrain Control Module in accordance with the service information. Refer to «MODULE, POWERTRAIN CONTROL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/communication-devices/#electronic-control-modules-service-information) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .

P0101-MASS AIR FLOW SENSOR PERFORMANCE

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article .

With the engine running.

The PCM detects that the (K157) Mass Air Flow Sensor Signal has exceeded it's maximum threshold.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

1. DTC IS ACTIVE NOTE: If any Sensor Reference DTCs are present, or if there are any other MAF Sensor DTCs present, perform the applicable diagnostic procedure before continuing with this test procedure. Ignition on, engine not running. With the scan tool, erase DTCs in the PCM. Start the engine and allow it to reach normal operating temperature. With the scan tool, select View DTCs. Is the status Active for this DTC? Yes Go To 2 . No Perform the INTERMITTENT DTC diagnostic procedure. Refer to «INTERMITTENT DTC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
2. CHECK FOR HIGH RESISTANCE IN THE (K157) MASS AIR FLOW SENSOR SIGNAL CIRCUIT Turn the ignition off. Disconnect the Mass Air Flow Sensor harness connector. Disconnect the PCM C1 harness connector. Measure the resistance of the (K157) Mass Air Flow Sensor Signal circuit between the Mass Air Flow Sensor harness connector and the PCM C1 harness connector. Is the resistance below 5.0 Ohms? Yes Go To 3 . No Repair the (K157) Mass Air Flow Sensor Signal circuit for an open or high resistance. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
3. CHECK FOR HIGH RESISTANCE IN THE (K957) MASS AIR FLOW SENSOR GROUND CIRCUIT Measure the resistance of the (K957) Mass Air Flow Sensor Ground circuit between the Mass Air Flow Sensor harness connector and the PCM C1 harness connector. Is the resistance below 5.0 Ohms? Yes Go To 4 . No Repair the (K957) Mass Air Flow Sensor Ground circuit for an open or high resistance. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
4. CHECK FOR INTAKE AND EXHAUST SYSTEM LEAKS OR RESTRICTIONS Turn the ignition off. Inspect the exhaust system for damaged components that could cause exhaust flow blockage. Inspect all air intake, crankcase vent and turbocharger related hoses/tubes and connections for damage, air leaks or blockage. Inspect the Charge Air Cooler hoses/tubes and connections for damage, air leaks or blockage. Inspect the air filter for excessive dirt, soiling or other problems that may cause restricted air flow. Were any problems found? Yes Repair or replace as necessary. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Go To 5 .
5. MASS AIR FLOW SENSOR Reconnect the PCM C1 harness connector. Replace the Mass Air Flow Sensor in accordance with the service information. Refer to «SENSOR, MASS AIRFLOW (MAF), REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . Turn the ignition on. With the scan tool, erase DTCs. Start the engine and allow it to reach normal operating temperature. With the scan tool, select View DTCs. Is the status Active for this DTC? Yes Go To 6 . No Test Complete. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
6. POWERTRAIN CONTROL MODULE Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Mass Air Flow Sensor and the Powertrain Control Module (PCM). Look for any chafed, pierced, pinched, or partially broken wires. Look for broken, bent, pushed out or corroded terminals. Monitor the scan tool data relative to this circuit and wiggle test the wiring and connectors. Look for the data to change or for the DTC to reset during the wiggle test. Perform any Technical Service Bulletins that may apply. Were any problems found? Yes Repair as necessary. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Replace the Powertrain Control Module in accordance with the service information. Refer to «MODULE, POWERTRAIN CONTROL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/communication-devices/#electronic-control-modules-service-information) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .

P0102-MASS AIR FLOW SENSOR CIRCUIT LOW

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article .

No reference Voltage DTCs present. With the engine running and engine.

The (K157) Mass Air Flow Sensor Signal is below the calibrated threshold for 1.5 seconds.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

Scheme 536

Scheme 537

Scheme 538

Scheme 539

1. DTC IS ACTIVE NOTE: If any Sensor Reference DTCs are present, perform the applicable diagnostic procedure before continuing with this test. Ignition on, engine not running. With the scan tool, erase DTCs in the Powertrain Control Module (PCM). Start the engine and allow it to reach normal operating temperature. With the scan tool, select View DTCs. Is the status Active for this DTC? Yes Go To 2 . No Perform the INTERMITTENT DTC diagnostic procedure. Refer to «INTERMITTENT DTC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
2. CHECK FOR INTAKE AND EXHAUST SYSTEM LEAKS OR RESTRICTIONS Turn the ignition off. Inspect the exhaust system for damaged components that could cause exhaust flow blockage. Inspect all air intake, crankcase vent and turbocharger related hoses/tubes and connections for damage, air leaks or blockage. Inspect the Charge Air Cooler hoses/tubes and connections for damage, air leaks or blockage. Inspect the air filter for excessive dirt, soiling or other problems that may cause restricted air flow. Were any problems found? Yes Repair or replace as necessary. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Go To 3 .
3. CHECK THE (F343) MASS AIR FLOW SENSOR 5-VOLT SUPPLY CIRCUIT FOR AN OPEN/HIGH RESISTANCE Turn the ignition on. using a 12-volt test light, probe the (F343) Mass Air Flow Sensor 5-Volt Supply circuit at the Mass Air Flow Sensor harness connector. Is the test light illuminated and bright? Yes Go To 4 . No Repair the (F343) Mass Air Flow Sensor 5-Volt Supply circuit for an open or high resistance. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
4. CHECK THE (K157) MASS AIR FLOW SENSOR SIGNAL CIRCUIT FOR AN OPEN/HIGH RESISTANCE Turn the ignition off. Disconnect the Mass Air Flow Sensor harness connector. Disconnect the PCM C1 harness connector. Measure the resistance of the (K157) Mass Air Flow Sensor Signal circuit between the Mass Air Flow Sensor connector and the PCM C1 harness connector. Is the resistance below 5.0 Ohms? Yes Go To 5 . No Repair the (K157) Mass Air Flow Sensor Signal circuit for an open or high resistance. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
5. CHECK THE (K157) MASS AIR FLOW SENSOR SIGNAL CIRCUIT FOR A SHORT TO GROUND Measure the resistance between ground and the (K157) Mass Air Flow Sensor Signal circuit in the Mass Air Flow Sensor harness connector. Is the resistance above 10k Ohms? Yes Go To 6 . No Repair the (K157) Mass Air Flow Sensor Signal circuit for a short to ground. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
6. CHECK FOR HE (K157) MASS AIR FLOW SENSOR SIGNAL CIRCUIT SHORTED TO THE (K957) MASS AIR FLOW SENSOR GROUND CIRCUIT Measure the resistance between the (K157) Mass Air Flow Sensor Signal circuit and the (K957) Mass Air Flow Sensor Ground circuit in the Mass Air Flow Sensor harness connector. Is the resistance above 10k Ohms? Yes Go To 7 . No Repair the (K157) Mass Air Flow Sensor Signal circuit for a short to the (K957) Mass Air Flow Sensor Ground circuit. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
7. MASS AIR FLOW SENSOR Reconnect the PCM C1 harness connector. Replace the Mass Air Flow Sensor in accordance with the service information. Refer to «SENSOR, MASS AIRFLOW (MAF), REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . Turn the ignition on. With the scan tool, erase DTCs. Start the engine and allow it to reach normal operating temperature. With the scan tool, select View DTCs. Is the status Active for this DTC? Yes Go To 8 . No Test Complete. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
8. POWERTRAIN CONTROL MODULE Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Mass Air Flow Sensor and the Powertrain Control Module (PCM). Look for any chafed, pierced, pinched, or partially broken wires. Look for broken, bent, pushed out or corroded terminals. Monitor the scan tool data relative to this circuit and wiggle test the wiring and connectors. Look for the data to change or for the DTC to reset during the wiggle test. Perform any Technical Service Bulletins that may apply. Were any problems found? Yes Repair as necessary. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Replace the Powertrain Control Module in accordance with the service information. Refer to «MODULE, POWERTRAIN CONTROL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/communication-devices/#electronic-control-modules-service-information) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .

P0103-MASS AIR FLOW SENSOR CIRCUIT HIGH

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article .

No reference Voltage DTCs present. With the engine running.

The (K157) Mass Air Flow Sensor Signal is above the calibrated threshold for 1.5 seconds.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

Scheme 540

Scheme 541

1. DTC IS ACTIVE NOTE: If any Sensor Reference DTCs are present, perform the applicable diagnostic procedure before continuing with this test. Ignition on, engine not running. With the scan tool, erase DTCs in the PCM. Start the engine and allow it to reach normal operating temperature. With the scan tool, select View DTCs. Is the status Active for this DTC? Yes Go To 2 . No Perform the INTERMITTENT DTC diagnostic procedure. Refer to «INTERMITTENT DTC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
2. CHECK THE (K157) MASS AIR FLOW SENSOR SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE Turn the ignition off. Disconnect the Mass Air Flow Sensor harness connector. Turn the ignition on. Measure the voltage of the (K157) Mass Air Flow Sensor Signal circuit in the Mass Air Flow Sensor harness connector. Does the voltage measure above 5.2 volts? Yes Repair the (K157) Mass Air Flow Sensor Signal circuit for a short to voltage. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Go To 3 .
3. CHECK THE (K157) MASS AIR FLOW SENSOR SIGNAL CIRCUIT FOR AN OPEN/HIGH RESISTANCE Turn the ignition off. Disconnect the PCM C1 harness connector. Measure the resistance of the (K157) Mass Air Flow Sensor Signal circuit between the Mass Air Flow Sensor connector and the PCM C1 harness connector. Is the resistance below 5.0 Ohms? Yes Go To 4 . No Repair the (K157) Mass Air Flow Sensor Signal circuit for an open or high resistance. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
4. CHECK THE (K957) MASS AIR FLOW SENSOR GROUND CIRCUIT FOR AN OPEN/HIGH RESISTANCE Turn the ignition off. Disconnect the PCM C1 harness connector. Measure the resistance of the (K957) Mass Air Flow Sensor Ground circuit between the Mass Air Flow Sensor connector and the PCM C1 harness connector. Is the resistance below 5.0 Ohms? Yes Go To 5 . No Repair the (K957) Mass Air Flow Sensor Ground circuit for an open or high resistance. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
5. MASS AIR FLOW SENSOR Reconnect the PCM C1 harness connector. Replace the Mass Air Flow Sensor in accordance with the service information. Refer to «SENSOR, MASS AIRFLOW (MAF), REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . Turn the ignition on. With the scan tool, erase DTCs. Start the engine and allow it to reach normal operating temperature. With the scan tool, select View DTCs. Is the status Active for this DTC? Yes Go To 6 . No Test Complete. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
6. POWERTRAIN CONTROL MODULE Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Mass Air Flow Sensor and the Powertrain Control Module (PCM). Look for any chafed, pierced, pinched, or partially broken wires. Look for broken, bent, pushed out or corroded terminals. Perform any Technical Service Bulletins that may apply. Were any problems found? Yes Repair as necessary. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Replace the Powertrain Control Module in accordance with the service information. Refer to «MODULE, POWERTRAIN CONTROL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/communication-devices/#electronic-control-modules-service-information) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .

P0112-INTAKE AIR TEMPERATURE SENSOR CIRCUIT LOW

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article .

The Intake Air Temperature Sensor is combined with the Mass Air Flow Sensor. It is located on the Air Cleaner Box and is used to monitor the temperature of the air entering the intake system. The Intake Air Temperature Sensor operates as a typical two wire sensor. It receives a 5-Volt signal on the (K362) Intake Air Temperature Sensor Signal circuit and uses the (K957) Sensor Ground circuit.

With the ignition on.

The (K362) Intake Air Temperature Sensor Signal circuit voltage is below the calibrated threshold for 1.5 seconds.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

Scheme 542

Scheme 543

1. DTC IS ACTIVE NOTE: If any Sensor Reference DTCs are present, perform those diagnostic procedures before continuing with this test. Ignition on, engine not running. With the scan tool, erase DTCs in the PCM. Monitor the scan tool for at least two minutes. Cycle the ignition key off and on several times, leaving the ignition on for at least 10 seconds at a time. With the scan tool, select View DTCs. Is the status Active for this DTC? Yes Go To 2 . No Perform the INTERMITTENT DTC diagnostic procedure. Refer to «INTERMITTENT DTC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
2. MASS AIR FLOW/INTAKE AIR TEMPERATURE SENSOR With the scan tool, erase DTCs. Turn the ignition off. Disconnect the Mass Air Flow/Intake Air Temperature Sensor harness connector. Turn the ignition on. With the scan tool, select View DTCs. NOTE: The scan tool should display a P0113-Intake Air Temperature Sensor High DTC as active or pending with the connector disconnected. Does the scan tool display the DTC as described above? Yes Replace the Mass Air Flow/Intake Air Temperature Sensor in accordance with the service information. Refer to «SENSOR, MASS AIRFLOW (MAF), REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Go To 3 .
3. CHECK THE (K362) INTAKE AIR TEMPERATURE SENSOR SIGNAL CIRCUIT FOR A SHORT TO GROUND Turn the ignition off. Disconnect the PCM C1 harness connector. Measure the resistance between ground and the (K362) Intake Air Temperature Sensor Signal circuit at the Mass Air Flow/Intake Air Temperature Sensor harness connector. Is the resistance above 10k Ohms? Yes Go To 4 . No Repair the (K362) Intake Air Temperature Sensor Signal circuit for a short to ground. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
4. CHECK FOR THE (K362) INTAKE AIR TEMPERATURE SENSOR SIGNAL CIRCUIT SHORTED TO (K916) INTAKE AIR TEMPERATURE SENSOR GROUND CIRCUIT Measure the resistance between the (K362) Intake Air Temperature Sensor Signal circuit and the (K916) Intake Air Temperature Sensor Ground circuit at the Mass Air Flow/Intake Air Temperature Sensor harness connector. Is the resistance above 10k Ohms? Yes Go To 5 . No Repair the (K362) Intake Air Temperature Sensor Signal circuit for a short to the (K916) Intake Air Temperature Sensor Ground circuit. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
5. POWERTRAIN CONTROL MODULE Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Mass Air Flow/Intake Air Temperature Sensor and the Powertrain Control Module. Look for any chafed, pierced, pinched, or partially broken wires. Look for broken, bent, pushed out or corroded terminals. Perform any Technical Service Bulletins that may apply. Were any problems found? Yes Repair as necessary. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Replace the Powertrain Control Module in accordance with the service information. Refer to «MODULE, POWERTRAIN CONTROL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/communication-devices/#electronic-control-modules-service-information) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .

P0113-INTAKE AIR TEMPERATURE SENSOR CIRCUIT HIGH

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article .

The Intake Air Temperature Sensor is combined with the Mass Air Flow Sensor. It is located on the Air Cleaner Box and is used to monitor the temperature of the air entering the intake system. The Intake Air Temperature Sensor operates as a typical two wire sensor. It receives a 5-Volt signal on the (K362) Intake Air Temperature Sensor Signal circuit and uses the (K957) Sensor Ground circuit. When this fault code is active the EGR system will be disabled.

With the ignition on.

The (K362) Intake Air Temperature Sensor Signal circuit voltage is above 3.2 Volts for 1.5 seconds.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

Scheme 544

Scheme 545

1. DTC IS ACTIVE Ignition on, engine not running. With the scan tool, erase DTCs in the PCM. Monitor the scan tool for at least two minutes. Cycle the ignition key off and on several times, leaving the ignition on for at least 10 seconds at a time. With the scan tool, select View DTCs. Is the status Active for this DTC? Yes Go To 2 . No Perform the INTERMITTENT DTC diagnostic procedure. Refer to «INTERMITTENT DTC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
2. CHECK THE (K362) INTAKE AIR TEMPERATURE SENSOR SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE Turn the ignition off. Disconnect the Mass Air Flow/Intake Air Temperature Sensor harness connector. Turn the ignition on. Measure the voltage of the (K362) Intake Air Temperature Sensor Signal circuit at the Mass Air Flow/Intake Air Temperature Sensor harness connector. Does the voltage measure above 5.2 volts? Yes Repair the (K362) Intake Air Temperature Sensor Signal circuit for a short to voltage. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Go To 3 .
3. CHECK THE (K362) INTAKE AIR TEMPERATURE SENSOR SIGNAL FOR AN OPEN/HIGH RESISTANCE Turn the ignition off. Disconnect the PCM C1 harness connector. Measure the resistance of the (K362) Intake Air Temperature Sensor Signal circuit between the Mass Air Flow/Intake Air Temperature Sensor harness connector and the PCM C1 harness connector. Is the resistance below 5.0 Ohms? Yes Go To 4 . No Repair the (K362) Intake Air Temperature Sensor Signal circuit for an open or high resistance. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
4. CHECK THE (K957) SENSOR GROUND CIRCUIT FOR AN OPEN/HIGH RESISTANCE Measure the resistance of the (K957) Sensor Ground circuit between the Mass Air Flow/Intake Air Temperature Sensor harness connector and the PCM C1 harness connector. Is the resistance below 5.0 Ohms? Yes Go To 5 . No Repair the (K957) Sensor Ground circuit for an open or high resistance. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
5. MASS AIR FLOW/INTAKE AIR TEMPERATURE SENSOR Turn the ignition off. Reconnect the PCM C1 harness connector. Connect a jumper wire between the (K957) Intake Air Temperature Sensor Ground circuit and the (K362) Intake Air Temperature Sensor Signal circuit at the Mass Air Flow/Intake Air Temperature Sensor harness connector. Turn the ignition on. With the scan tool, select View DTCs. NOTE: The scan tool should display a P0112-Intake Air Temperature Sensor Low DTC as active or pending with the jumper wire in place. Does the scan tool display the DTC as described above? Yes Replace the Mass Air Flow/Intake Air Temperature Sensor in accordance with the service information. Refer to «SENSOR, MASS AIRFLOW (MAF), REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Go To 6 .
6. POWERTRAIN CONTROL MODULE Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Mass Air Flow/Intake Air Temperature Sensor and the Powertrain Control Module. Look for any chafed, pierced, pinched, or partially broken wires. Look for broken, bent, pushed out or corroded terminals. Monitor the scan tool data relative to this circuit and wiggle test the wiring and connectors. Look for the data to change or for the DTC to reset during the wiggle test. Perform any Technical Service Bulletins that may apply. Were any problems found? Yes Repair as necessary. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Replace the Powertrain Control Module in accordance with the service information. Refer to «MODULE, POWERTRAIN CONTROL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/communication-devices/#electronic-control-modules-service-information) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .

Scheme 546

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article .

The Engine Coolant Temperature Sensor is located on the left side of the engine block under the Intake Manifold. The Engine Coolant Temperature Sensor operates as a typical two wire sensor. It receives a 5-Volt signal on the (K2) ECT Sensor Signal circuit and sensor return on the (K200) Sensor Ground circuit. When this fault code is active the EGR system will be disabled.

With the ignition on.

The (K2) Engine Coolant Temperature Sensor Signal circuit voltage is below the calibrated threshold for 0.48 second.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

Scheme 547

Scheme 548

1. DTC IS ACTIVE Ignition on, engine not running. With the scan tool, erase DTCs in the PCM. Monitor the scan tool for at least two minutes. Cycle the ignition key off and on several times, leaving the ignition on for at least 10 seconds at a time. With the scan tool, select View DTCs. Is the status Active for this DTC? Yes Go To 2 . No Perform the INTERMITTENT DTC diagnostic procedure. Refer to «INTERMITTENT DTC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
2. ENGINE COOLANT TEMPERATURE SENSOR Disconnect the Engine Coolant Temperature Sensor harness connector. With the scan tool, select View DTCs. NOTE: The scan tool should display a P0118-Engine Coolant Temperature Sensor High DTC as active with the connector disconnected. Does the scan tool display the DTC as described above? Yes Replace the Engine Coolant Temperature Sensor in accordance with the service information. Refer to «SENSOR, COOLANT TEMPERATURE, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/accessory-drive-belts/#engine-cooling-system) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Go To 3 .
3. CHECK THE (K2) ENGINE COOLANT TEMPERATURE SENSOR SIGNAL CIRCUIT FOR A SHORT TO GROUND Turn the ignition off. Disconnect the PCM C2 harness connector. Measure the resistance between ground and the (K2) Engine Coolant Temperature Sensor Signal circuit at the Engine Coolant Temperature Sensor harness connector. Is the resistance above 10k Ohms? Yes Go To 4 . No Repair the (K2) Engine Coolant Temperature Sensor Signal circuit for a short to ground. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
4. CHECK FOR THE (K2) ENGINE COOLANT TEMPERATURE SENSOR SIGNAL CIRCUIT SHORTED TO THE (K200) SENSOR GROUND CIRCUIT Measure the resistance between the (K2) Engine Coolant Temperature Sensor Signal circuit and the (K200) Sensor Ground circuit at the Engine Coolant Temperature Sensor harness connector. Is the resistance above 10k Ohms? Yes Go To 5 . No Repair the (K2) Engine Coolant Temperature Sensor Signal circuit for a short to the (K200) Sensor Ground circuit. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
5. POWERTRAIN CONTROL MODULE Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Engine Coolant Temperature Sensor and the Powertrain Control Module (PCM). Look for any chafed, pierced, pinched, or partially broken wires. Look for broken, bent, pushed out or corroded terminals. Perform any Technical Service Bulletins that may apply. Were any problems found? Yes Repair as necessary. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Replace and program the Powertrain Control Module in accordance the service information. Refer to «MODULE, POWERTRAIN CONTROL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/communication-devices/#electronic-control-modules-service-information) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .

P0118-ENGINE COOLANT TEMPERATURE SENSOR CIRCUIT HIGH

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article .

The Engine Coolant Temperature Sensor is located on the left side of the engine block under the Intake Manifold. The Engine Coolant Temperature Sensor operates as a typical two wire sensor. It receives a 5-Volt signal on the (K2) ECT Sensor Signal circuit and sensor return on the (K200) Sensor Ground circuit. When this fault code is active the EGR system will be disabled.

With the ignition on.

The (K2) Engine Coolant Temperature Sensor Signal circuit voltage is above the maximum threshold for 0.48 second.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

Scheme 549

Scheme 550

Scheme 551

1. DTC IS ACTIVE Ignition on, engine not running. With the scan tool, erase DTCs in the PCM. Monitor the scan tool for at least two minutes. Cycle the ignition key off and on several times, leaving the ignition on for at least 10 seconds at a time. With the scan tool, select View DTCs. Is the status Active for this DTC? Yes Go To 2 . No Perform the INTERMITTENT DTC diagnostic procedure. Refer to «INTERMITTENT DTC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
2. CHECK THE (K2) ENGINE COOLANT TEMPERATURE SENSOR SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE Disconnect the Engine Coolant Temperature Sensor harness connector. Measure the voltage of the (K2) Engine Coolant Temperature Sensor Signal circuit in the Engine Coolant Temperature Sensor harness connector. Is the voltage above 5.2 volts? Yes Repair the (K2) Engine Coolant Temperature Sensor Signal circuit for a short to voltage. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Go To 3 .
3. CHECK THE (K2) ENGINE COOLANT TEMPERATURE SENSOR SIGNAL FOR AN OPEN/HIGH RESISTANCE Turn the ignition off. Disconnect the PCM C2 harness connector. Measure the resistance of the (K2) Engine Coolant Temperature Sensor Signal circuit between the Engine Coolant Temperature Sensor harness connector and the PCM C2 harness connector. Is the resistance below 5.0 Ohms? Yes Go To 4 . No Repair the (K2) Engine Coolant Temperature Sensor Signal circuit for an open or high resistance. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
4. CHECK THE (K200) SENSOR GROUND CIRCUIT FOR AN OPEN/HIGH RESISTANCE Measure the resistance of the (K200) Sensor Ground circuit between the Engine Coolant Temperature Sensor harness connector and the PCM C2 harness connector. Is the resistance below 5.0 Ohms? Yes Go To 5 . No Repair the (K200) Sensor Ground circuit for an open or high resistance. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
5. CHECK THE ENGINE COOLANT TEMPERATURE SENSOR Turn the ignition on. With the scan tool, erase DTCs. Turn the ignition off. Reconnect the PCM C2 harness connector. Connect a jumper wire between the (K200) Sensor Ground circuit and the (K2) Engine Coolant Temperature Sensor Signal circuit in the Engine Coolant Temperature Sensor harness connector. Turn the ignition on. With the scan tool, select View DTCs. NOTE: The scan tool should display a P0117-Engine Coolant Temperature Sensor Low DTC as active with the jumper wire in place. Does the scan tool display the DTC as described above? Yes Replace the Engine Coolant Temperature Sensor in accordance with the service information. Refer to «SENSOR, COOLANT TEMPERATURE, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/accessory-drive-belts/#engine-cooling-system) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Go To 6 .
6. POWERTRAIN CONTROL MODULE Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Engine Coolant Temperature Sensor and the Powertrain Control Module (PCM). Look for any chafed, pierced, pinched, or partially broken wires. Look for broken, bent, pushed out or corroded terminals. Perform any Technical Service Bulletins that may apply. Were any problems found? Yes Repair as necessary. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Replace and program the Powertrain Control Module in accordance the service information. Refer to «MODULE, POWERTRAIN CONTROL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/communication-devices/#electronic-control-modules-service-information) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .

P0130-O2 SENSOR 1/1 CIRCUIT OPEN

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article .

With the ignition on and the O2 Sensor 1/1 in closed loop.

The Powertrain Control Module (PCM) detects an open on the (K79) O2 Sensor 1/1 Heater Control circuit for 10 events.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

1. DTC IS ACTIVE Ignition on, engine not running. With the scan tool, erase DTCs in the PCM. Start the engine. Allow the engine to reach normal operating temperature. Test drive the vehicle under several different driving conditions. With the scan tool, select View DTCs. Is the status Active for this DTC? Yes Go To 3 . No Perform the INTERMITTENT DTC diagnostic procedure. Refer to «INTERMITTENT DTC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
2. CHECK THE (K79) O2 SENSOR 1/1 HEATER CONTROL CIRCUIT FOR AN OPEN/HIGH RESISTANCE Turn the ignition off. Disconnect the Oxygen Sensor harness connector. Disconnect the PCM C1 harness connector. Measure the resistance of the (K79) O2 Sensor 1/1 Heater Control circuit between the Oxygen Sensor harness connector and the PCM C1 harness connector. Is the resistance below 5.0 Ohms? Yes Go To 3 . No Repair the (K79) O2 Sensor 1/1 Heater Control circuit for an open or high resistance. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
3. OXYGEN SENSOR Reconnect the PCM C1 harness connector. Replace the Oxygen Sensor in accordance with the service information. Refer to «SENSOR, OXYGEN, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . Start the engine. Allow the engine to reach normal operating temperature. Test drive the vehicle under several different driving conditions. With the scan tool, select View DTCs. Is the status Active for this DTC? Yes Go To 4 . No Test Complete. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
4. POWERTRAIN CONTROL MODULE Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Oxygen Sensor and the Powertrain Control Module. Look for any chafed, pierced, pinched, or partially broken wires. Look for broken, bent, pushed out or corroded terminals. Perform any Technical Service Bulletins that may apply. Were any problems found? Yes Repair as necessary. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Replace the Powertrain Control Module in accordance with the service information. Refer to «MODULE, POWERTRAIN CONTROL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/communication-devices/#electronic-control-modules-service-information) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .

P0131-O2 SENSOR 1/1 CIRCUIT LOW

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article .

With the ignition on and the O2 Sensor 1/1 at operating temperature.

The Powertrain Control Module (PCM) detects that the (K79) O2 Sensor 1/1 Heater Control circuit is below the calibrated threshold for 2.0 seconds.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

1. DTC IS ACTIVE NOTE: If there are any Mass Airflow Sensor or Fuel Injector DTCs present, diagnose those DTCs before proceeding with this test procedure. Ignition on, engine not running. With the scan tool, clear DTCs in the PCM. Start the engine. Allow the engine to reach normal operating temperature. Test drive the vehicle under several different driving conditions. With the scan tool, select View DTCs. Is the status Active for this DTC? Yes Go To 2 . No Perform the INTERMITTENT DTC diagnostic procedure. Refer to «INTERMITTENT DTC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
2. CHECK THE (K79) O2 SENSOR 1/1 HEATER CONTROL CIRCUIT FOR A SHORT TO GROUND Turn the ignition off. Disconnect the Oxygen Sensor harness connector. Disconnect the PCM C1 harness connector. Measure the resistance between ground and the (K79) O2 Sensor 1/1 Heater Control circuit in the Oxygen Sensor harness connector. Is the resistance above 10k Ohms? Yes Go To 3 . No Repair the (K79) O2 Sensor 1/1 Heater Control circuit for a short to ground. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
3. OXYGEN SENSOR Reconnect the PCM C1 harness connector. Replace the Oxygen Sensor in accordance with the service information. Refer to «SENSOR, OXYGEN, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . Start the engine. Allow the engine to reach normal operating temperature. Monitor the scan tool for at least two minutes. With the scan tool, select View DTCs. Is the status Active for this DTC? Yes Go To 4 . No Test Complete. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
4. POWERTRAIN CONTROL MODULE Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Oxygen Sensor and the Powertrain Control Module. Look for any chafed, pierced, pinched, or partially broken wires. Look for broken, bent, pushed out or corroded terminals. Monitor the scan tool data relative to this circuit and wiggle test the wiring and connectors. Look for the data to change or for the DTC to reset during the wiggle test. Perform any Technical Service Bulletins that may apply. Were any problems found? Yes Repair as necessary. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Replace the Powertrain Control Module in accordance with the service information. Refer to «MODULE, POWERTRAIN CONTROL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/communication-devices/#electronic-control-modules-service-information) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .

P0132-O2 SENSOR 1/1 CIRCUIT HIGH

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article .

With the ignition on and the O2 Sensor 1/1 at operating temperature.

The Powertrain Control Module (PCM) detects that the (K79) O2 Sensor 1/1 Heater Control circuit is above the maximum threshold for 2.0 seconds.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

Scheme 552

1. DTC IS ACTIVE NOTE: If there are any Mass Airflow Sensor or Fuel Injector DTCs present, diagnose those DTCs before proceeding with this test procedure. Ignition on, engine not running. With the scan tool, erase DTCs in the PCM. Start the engine. Allow the engine to reach normal operating temperature. Test drive the vehicle under several different driving conditions. With the scan tool, select View DTCs. Is the status Active for this DTC? Yes Go To 2 . No Perform the INTERMITTENT DTC diagnostic procedure. Refer to «INTERMITTENT DTC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
2. (K79) O2 SENSOR 1/1 HEATER CONTROL CIRCUIT SHORTED TO VOLTAGE Turn the ignition off. Disconnect the Oxygen Sensor harness connector. Disconnect the PCM C1 harness connector. Remove the ASD Relay from the TIPM. Connect a jumper wire between cavity 30 and cavity 87 of the ASD Relay connector. Turn the ignition on. Measure the voltage of the (K79) O2 Sensor 1/1 Heater Control circuit at the Oxygen Sensor harness connector. Is there any voltage present? Yes Repair the (K79) O2 Sensor 1/1 Heater Control circuit for a short to voltage. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Go To 3 .
3. OXYGEN SENSOR Turn the ignition off. Reconnect the PCM C1 harness connector. Replace the Oxygen Sensor in accordance with the service information. Refer to «SENSOR, OXYGEN, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . Start the engine. Allow the engine to reach normal operating temperature. Monitor the scan tool for at least two minutes. Using the scan tool, select View DTCs. Is the status Active for this DTC? Yes Go To 4 . No Repair complete. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
4. POWERTRAIN CONTROL MODULE Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Oxygen Sensor and the Powertrain Control Module (PCM). Look for any chafed, pierced, pinched or partially broken wires. Look for broken, bent, pushed out or corroded terminals. Perform any Technical Service Bulletins that may apply. Were any problems found? Yes Repair as necessary. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Replace the Powertrain Control Module in accordance with the service information. Refer to «MODULE, POWERTRAIN CONTROL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/communication-devices/#electronic-control-modules-service-information) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .

P0134-O2 SENSOR CIRCUIT NO ACTIVITY DETECTED - BANK 1 SENSOR 1

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article .

With the ignition on and the Oxygen Sensor in closed loop.

The Powertrain Control Module (PCM) detects a short to voltage or ground on the O2 Senor 1/1 signal or pump cell circuits for 2.0 seconds.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

Scheme 553

Scheme 554

Scheme 555

Scheme 556

Scheme 557

Scheme 558

Scheme 559

Scheme 560

1. DTC IS ACTIVE Ignition on, engine not running. With the scan tool, clear DTCs in the PCM. Start the engine and allow the engine to reach normal operating temperature. Monitor the scan tool for at least two minutes. With the scan tool, select View DTCs. Is the status Active for this DTC? Yes Go To 2 . No Perform the INTERMITTENT DTC diagnostic procedure. Refer to «INTERMITTENT DTC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
2. CHECK THE (K41) O2 SENSOR 1/1 SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE Turn the ignition off. Disconnect the Oxygen Sensor harness connector. Disconnect the PCM C1 harness connector. Remove the ASD Relay from the TIPM. Connect a jumper wire between cavity 30 and cavity 87 of the ASD Relay connector. Turn the ignition on. Measure the voltage of the (K41) O2 Sensor 1/1 Signal circuit at the Oxygen Sensor harness connector. Is there any voltage present? Yes Repair the (K41) O2 Sensor 1/1 Signal circuit for a short to voltage. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Go To 3 .
3. CHECK THE (K902) O2 SENSOR 1/1 GROUND CIRCUIT FOR A SHORT TO VOLTAGE Measure the voltage of the (K902) O2 Sensor 1/1 Ground circuit at the Oxygen Sensor harness connector. Is there any voltage present? Yes Repair the (K902) O2 Sensor 1/1 Ground circuit for a short to voltage. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Go To 4 .
4. CHECK THE (K103) O2 SENSOR 1/1 PUMP CELL CURRENT TRIM CIRCUIT FOR A SHORT TO VOLTAGE Measure the voltage of the (K103) O2 Sensor 1/1 Pump Cell Current Trim circuit at the Oxygen Sensor harness connector. Is there any voltage present? Yes Repair the (K103) O2 Sensor 1/1 Pump Cell Current Trim circuit for a short to voltage. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Go To 5 .
5. CHECK THE (K89) O2 SENSOR 1/1 NEGATIVE CURRENT CONTROL CIRCUIT FOR A SHORT TO VOLTAGE Measure the voltage of the (K89) O2 Sensor 1/1 Negative Current Control circuit at the Oxygen Sensor harness connector. Is there any voltage present? Yes Repair the (K89) O2 Sensor 1/1 Negative Current Control circuit for a short to voltage. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Go To 6 .
6. CHECK THE (K41) O2 SENSOR 1/1 SIGNAL CIRCUIT FOR A SHORT TO GROUND Turn the ignition off. Remove the jumper wire and install the ASD Relay. Measure the resistance between ground and the (K41) O2 Sensor 1/1 Signal circuit at the Oxygen Sensor harness connector. Is the resistance above 10k Ohms? Yes Go To 7 . No Repair the (K41) O2 Sensor 1/1 Signal circuit for a short to ground. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
7. CHECK THE (K902) O2 SENSOR 1/1 GROUND CIRCUIT FOR A SHORT TO GROUND Measure the resistance between ground and the (K902) O2 Sensor 1/1 Ground circuit at the Oxygen Sensor harness connector. Is the resistance below 5.0 Ohms? Yes Go To 8 . No Repair the (K902) O2 Sensor 1/1 Ground circuit for an open or high resistance. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
8. CHECK THE (K103) O2 SENSOR 1/1 PUMP CELL CURRENT TRIM CIRCUIT FOR A SHORT TO GROUND Measure the resistance between ground and the (K103) O2 Sensor 1/1 Pump Cell Current Trim circuit at the Oxygen Sensor harness connector. Is the resistance below 5.0 Ohms? Yes Go To 9 . No Repair the (K103) O2 Sensor 1/1 Pump Cell Current Trim circuit for an open or high resistance. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
9. CHECK THE (K89) O2 SENSOR 1/1 NEGATIVE CURRENT CONTROL CIRCUIT FOR A SHORT TO GROUND Measure the resistance between ground and the (K89) O2 Sensor 1/1 Negative Current Control circuit at the Oxygen Sensor harness connector. Is the resistance below 5.0 Ohms? Yes Go To 10 . No Repair the (K89) O2 Sensor 1/1 Negative Current Control circuit for an open or high resistance. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
10. OXYGEN SENSOR Reconnect the PCM C1 harness connector. Replace the Oxygen Sensor in accordance with the service information. Start the engine. Allow the engine to reach normal operating temperature. Monitor the scan tool for at least two minutes. With the scan tool, select View DTCs. Is the status Active for this DTC? Yes Go To 11 . No Test Complete. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
11. POWERTRAIN CONTROL MODULE Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Oxygen Sensor and the Powertrain Control Module. Look for any chafed, pierced, pinched, or partially broken wires. Look for broken, bent, pushed out or corroded terminals. Perform any Technical Service Bulletins that may apply. Were any problems found? Yes Repair as necessary. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Replace the Powertrain Control Module in accordance with the service information. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .

P0135-O2 SENSOR 1/1 HEATER PERFORMANCE

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article .

With the ignition on and the Oxygen Sensor Heater command on.

The Powertrain Control Module (PCM) detects an implausible voltage on the (K79) O2 Sensor 1/1 Heater Control circuit for 5.0 seconds.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

1. DTC IS ACTIVE Ignition on, engine not running. With the scan tool, erase DTCs in the PCM. Start the engine and allow the engine to reach normal operating temperature. Monitor the scan tool for at least two minutes. With the scan tool, select View DTCs. Is the status Active for this DTC? Yes Go To 2 . No Perform the INTERMITTENT DTC diagnostic procedure. Refer to «INTERMITTENT DTC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
2. CHECK THE (K79) O2 SENSOR 1/1 HEATER CONTROL CIRCUIT FOR AN OPEN/HIGH RESISTANCE Turn the ignition off. Disconnect the Oxygen Sensor harness connector. Disconnect the PCM C1 harness connector. Measure the resistance of the (K79) O2 Sensor 1/1 Heater Control circuit between the Oxygen Sensor harness connector and the PCM C1 harness connector. Is the resistance below 5.0 Ohms? Yes Go To 3 . No Repair the (K79) O2 Sensor 1/1 Heater Control circuit for an open or high resistance. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
3. OXYGEN SENSOR Reconnect the PCM C1 harness connector. Replace the Oxygen Sensor in accordance with the service information. Refer to «SENSOR, OXYGEN, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . Start the engine. Allow the engine to reach normal operating temperature. Monitor the scan tool for at least two minutes. With the scan tool, select View DTCs. Is the status Active for this DTC? Yes Go To 4 . No Test Complete. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
4. POWERTRAIN CONTROL MODULE Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Oxygen Sensor and the Powertrain Control Module. Look for any chafed, pierced, pinched, or partially broken wires. Look for broken, bent, pushed out or corroded terminals. Perform any Technical Service Bulletins that may apply. Were any problems found? Yes Repair as necessary. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Replace the Powertrain Control Module in accordance with the service information. Refer to «MODULE, POWERTRAIN CONTROL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/communication-devices/#electronic-control-modules-service-information) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .

P0182-FUEL TEMPERATURE SENSOR CIRCUIT LOW

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article .

The Fuel Temperature Sensor is combined with the Fuel Heater and located on the Fuel Filter/water separator housing which is mounted on the right frame rail next to the Diesel Particulate Filter. The Fuel Temperature Sensor operates as a typical two wire sensor. It receives a 5-Volt signal on the (K156) Fuel Temperature Sensor Signal circuit and uses the (K159) Sensor Ground circuit.

With the ignition on.

The (K156) Fuel Temperature Sensor Signal circuit voltage is below the calibrated threshold for 0.5 second.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

1. DTC IS ACTIVE Ignition on, engine not running. With the scan tool, select View DTCs. Is the status Active for this DTC? Yes Go To 2 . No Perform the INTERMITTENT DTC diagnostic procedure. Refer to «INTERMITTENT DTC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
2. CHECK THE FUEL TEMPERATURE SENSOR Turn the ignition off. Disconnect the Fuel Temperature Sensor harness connector. Turn the ignition on. With the scan tool, select View DTCs. NOTE: The scan tool should display a Fuel Temperature Sensor High DTC as active with the Fuel Temperature Sensor connector disconnected. Does the scan tool display the DTC as described above? Yes Replace the Fuel Temperature Sensor in accordance with the service information. Refer to «SENSOR, FUEL TEMPERATURE, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Go To 3 .
3. CHECK THE (K156) FUEL TEMPERATURE SENSOR SIGNAL CIRCUIT FOR A SHORT TO GROUND Turn the ignition off. Disconnect the PCM C1 harness connector. Measure the resistance between ground and the (K156) Fuel Temperature Sensor Signal circuit at the Fuel Temperature Sensor harness connector. Is the resistance above 10k Ohms? Yes Go To 4 . No Repair the (K156) Fuel Temperature Sensor Signal circuit for a short to ground. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
4. CHECK FOR THE (K156) FUEL TEMPERATURE SENSOR SIGNAL CIRCUIT SHORTED TO THE (K159) FUEL TEMPERATURE SENSOR GROUND CIRCUIT Measure the resistance between the (K156) Fuel Temperature Sensor Signal circuit and the (K159) Fuel Temperature Sensor Ground circuit in the Fuel Temperature Sensor harness connector. Is the resistance above 10k Ohms? Yes Go To 5 . No Repair the (K156) Fuel Temperature Sensor Signal circuit for a short to the (K159) Fuel Temperature Sensor Ground circuit. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
5. POWERTRAIN CONTROL MODULE Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Fuel Temperature Sensor and the Powertrain Control Module (PCM). Look for any chafed, pierced, pinched, or partially broken wires. Look for broken, bent, pushed out or corroded terminals. Perform any Technical Service Bulletins that may apply. Were any problems found? Yes Repair as necessary. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Replace and program the Powertrain Control Module in accordance the service information. Refer to «MODULE, POWERTRAIN CONTROL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/communication-devices/#electronic-control-modules-service-information) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .

P0183-FUEL TEMPERATURE SENSOR CIRCUIT HIGH

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article .

The Fuel Temperature Sensor is combined with the Fuel Heater and located on the Fuel Filter/water separator housing which is mounted on the left frame rail next to the Transmission. The Fuel Temperature Sensor operates as a typical two wire sensor. It receives a 5-Volt signal on the (K156) Fuel Temperature Sensor Signal circuit and uses the (K159) Sensor Ground circuit.

With the ignition on.

The (K156) Fuel Temperature Sensor Signal circuit voltage is above the calibrated threshold for 0.5 second.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

1. DTC IS ACTIVE Ignition on, engine not running. With the scan tool, select View DTCs. Is the status Active for this DTC? Yes Go To 2 . No Perform the INTERMITTENT DTC diagnostic procedure. Refer to «INTERMITTENT DTC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
2. CHECK THE (K156) FUEL TEMPERATURE SENSOR SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE Turn the ignition off. Disconnect the Fuel Temperature Sensor harness connector. Turn the ignition on. Measure the voltage of the (K156) Fuel Temperature Sensor Signal circuit in the Fuel Temperature Sensor harness connector. Does the voltage measure above 5.2 volts? Yes Repair the (K156) Fuel Temperature Sensor Signal circuit for a short to voltage. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Go To 3 .
3. CHECK THE (K156) FUEL TEMPERATURE SENSOR SIGNAL FOR AN OPEN/HIGH RESISTANCE Turn the ignition off. Disconnect the PCM C1 harness connector. Measure the resistance of the (K156) Fuel Temperature Sensor Signal circuit between the Fuel Temperature Sensor harness connector and the PCM C1 harness connector. Is the resistance below 5.0 Ohms? Yes Go To 4 . No Repair the (K156) Fuel Temperature Sensor Signal circuit for an open or high resistance. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
4. CHECK THE (K159) FUEL TEMPERATURE SENSOR GROUND CIRCUIT FOR AN OPEN/HIGH RESISTANCE Measure the resistance of the (K159) Fuel Temperature Sensor Ground circuit between the Fuel Temperature Sensor harness connector and the PCM C1 harness connector. Is the resistance below 5.0 Ohms? Yes Go To 5 . No Repair the (K159) Fuel Temperature Sensor Ground circuit for an open or high resistance. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
5. CHECK THE FUEL TEMPERATURE SENSOR Turn the ignition off. Reconnect the Fuel Temperature Sensor harness connector. Reconnect the PCM C1 harness connector. Turn the ignition on. With the scan tool, clear DTCs. Turn the ignition off. Disconnect the Fuel Temperature Sensor harness connector. Connect a jumper wire between the (K159) Fuel Temperature Sensor Ground circuit and the (K156) Fuel Temperature Sensor Signal circuit in the Fuel Temperature Sensor harness connector. Turn the ignition on. With the scan tool, select View DTCs. NOTE: The scan tool should display a P0182-Fuel Temperature Sensor Low DTC as active with the jumper wire in place. Does the scan tool display the DTC as described above? Yes Replace the Fuel Temperature Sensor in accordance with the service information. Refer to «SENSOR, FUEL TEMPERATURE, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Go To 6 .
6. POWERTRAIN CONTROL MODULE Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Fuel Temperature Sensor and the Powertrain Control Module (PCM). Look for any chafed, pierced, pinched, or partially broken wires. Look for broken, bent, pushed out or corroded terminals. Perform any Technical Service Bulletins that may apply. Were any problems found? Yes Repair as necessary. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Replace and program the Powertrain Control Module in accordance the service information. Refer to «MODULE, POWERTRAIN CONTROL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/communication-devices/#electronic-control-modules-service-information) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .

P0192-FUEL RAIL PRESSURE SENSOR LOW

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article .

With the ignition on.

The (K181) Fuel Rail Pressure Sensor Signal circuit voltage is below the calibrated threshold for 0.14 second.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

Scheme 561

Scheme 562

Scheme 563

1. DTC IS ACTIVE NOTE: If there are any Sensor Reference DTCs present, perform those diagnostic procedures before continuing with this test. Ignition on, engine not running. With the scan tool, select View DTCs. Is the status Active for this DTC? Yes Go To 2 . No Perform the INTERMITTENT DTC diagnostic procedure. Refer to «INTERMITTENT DTC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
2. CHECK THE (K350) 5-VOLT SUPPLY CIRCUIT VOLTAGE Turn the ignition off. Disconnect the Fuel Rail Pressure Sensor harness connector. Turn the ignition on. Measure the voltage of the (K350) 5-Volt Supply circuit at the Fuel Rail Pressure Sensor harness connector. Is the voltage above 4.8 volts? Yes Go To 3 . No Repair the (K350) 5-Volt Supply circuit for an open circuit or a short to ground condition. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
3. FUEL PRESSURE SENSOR Reconnect the Fuel Rail Pressure Sensor harness connector. Turn the ignition on. With the scan tool, erase DTCs. Turn the ignition off. Disconnect the Fuel Rail Pressure Sensor harness connector. Turn the ignition on. With the scan tool, select View DTCs. NOTE: The scan tool should display a P0193-Fuel Rail Pressure Sensor High DTC as active or pending with the connector unplugged. Does the scan tool display the DTC as described above? Yes Replace the Fuel Rail Assembly in accordance with the service information. Refer to «RAIL, FUEL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . NOTE: The Fuel Rail Pressure Sensor is not serviceable separate from the Fuel Rail Assembly. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Go To 4 .
4. CHECK THE (K181) FUEL PRESSURE SENSOR SIGNAL CIRCUIT FOR A SHORT TO GROUND Turn the ignition off. Disconnect the PCM C2 harness connector. Measure the resistance between ground and the (K181) Fuel Rail Pressure Sensor Signal circuit at the Fuel Rail Pressure Sensor harness connector. Is the resistance above 10k Ohms? Yes Go To 5 . No Repair the (K181) Fuel Rail Pressure Sensor Signal circuit for a short to ground. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
5. CHECK FOR THE (K181) FUEL PRESSURE SENSOR SIGNAL CIRCUIT SHORTED TO THE (K359) FUEL PRESSURE SENSOR GROUND CIRCUIT Measure the resistance between the (K181) Fuel Rail Pressure Sensor Signal circuit and the (K359) Fuel Rail Pressure Sensor Ground circuit at the Fuel Rail Pressure Sensor harness connector. Is the resistance above 10k Ohms? Yes Go To 6 . No Repair the (K181) Fuel Rail Pressure Sensor Signal circuit for a short to the (K359) Fuel Rail Pressure Sensor Ground circuit. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
6. POWERTRAIN CONTROL MODULE Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Fuel Rail Pressure Sensor and the Powertrain Control Module (PCM). Look for any chafed, pierced, pinched, or partially broken wires. Look for broken, bent, pushed out or corroded terminals. Perform any Technical Service Bulletins that may apply. Were any problems found? Yes Repair as necessary. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Replace and program the Powertrain Control Module in accordance the service information. Refer to «MODULE, POWERTRAIN CONTROL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/communication-devices/#electronic-control-modules-service-information) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .

P0193-FUEL RAIL PRESSURE SENSOR HIGH

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article .

With the ignition on.

The (K181) Fuel Rail Pressure Sensor Signal circuit voltage is above the calibrated threshold for 0.14 second.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

Scheme 564

Scheme 565

Scheme 566

1. DTC IS ACTIVE NOTE: If there are any Sensor Reference DTCs present, perform those diagnostic procedures before continuing with this test. Ignition on, engine not running. With the scan tool, select View DTCs. Is the status Active for this DTC? Yes Go To 2 . No Perform the INTERMITTENT DTC diagnostic procedure. Refer to «INTERMITTENT DTC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
2. CHECK THE (K181) FUEL PRESSURE SENSOR SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE Turn the ignition off. Disconnect the Fuel Rail Pressure Sensor harness connector. Turn the ignition on. Measure the voltage of the (K181) Fuel Rail Pressure Sensor Signal circuit in the Fuel Rail Pressure Sensor harness connector. Does the voltage measure above 5.2 volts? Yes Repair the (K181) Fuel Rail Pressure Sensor Signal circuit for a short to voltage. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Go To 3 .
3. CHECK THE (K181) FUEL PRESSURE SENSOR SIGNAL CIRCUIT FOR AN OPEN/HIGH RESISTANCE Turn the ignition off. Disconnect the PCM C2 harness connector. Measure the resistance of the (K181) Fuel Rail Pressure Sensor Signal circuit between the Fuel Rail Pressure Sensor harness connector and the PCM C2 harness connector. Is the resistance below 5.0 Ohms? Yes Go To 4 . No Repair the (K181) Fuel Rail Pressure Sensor Signal circuit for an open or high resistance. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
4. CHECK THE (K359) FUEL PRESSURE SENSOR GROUND CIRCUIT FOR AN OPEN/HIGH RESISTANCE Measure the resistance of the (K359) Fuel Rail Pressure Sensor Ground circuit between the Fuel Rail Pressure Sensor harness connector and the PCM C2 harness connector. Is the resistance below 5.0 Ohms? Yes Go To 5 . No Repair the (K359) Fuel Rail Pressure Sensor Ground circuit for an open or high resistance. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
5. CHECK THE FUEL PRESSURE SENSOR Reconnect the Fuel Rail Pressure Sensor harness connector. Reconnect the PCM C2 harness connector. Turn the ignition on. With the scan tool, erase DTCs. Turn the ignition off. Disconnect the Fuel Rail Pressure Sensor harness connector. Connect a jumper between the (K359) Fuel Rail Pressure Sensor Ground circuit and the (K181) Fuel Rail Pressure Sensor Signal circuit at the Fuel Rail Pressure Sensor harness connector. Turn the ignition on. With the scan tool, select View DTCs. NOTE: The scan tool should display a P0192-Fuel Rail Pressure Sensor Low DTC as active or pending with the jumper in place. Does the scan tool display the DTC as described above? Yes Replace the Fuel Rail Assembly in accordance with the service information. Refer to «RAIL, FUEL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . NOTE: The Fuel Rail Pressure Sensor is not serviceable separate from the Fuel Rail Assembly. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Go To 6 .
6. POWERTRAIN CONTROL MODULE Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Fuel Rail Pressure Sensor and the Powertrain Control Module (PCM). Look for any chafed, pierced, pinched, or partially broken wires. Look for broken, bent, pushed out or corroded terminals. Perform any Technical Service Bulletins that may apply. Were any problems found? Yes Repair as necessary. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Replace and program the Powertrain Control Module in accordance the service information. Refer to «MODULE, POWERTRAIN CONTROL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/communication-devices/#electronic-control-modules-service-information) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .

Scheme 567

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article .

With the engine running.

The Powertrain Control Module (PCM) detects an open Fuel Injector 1 control circuit.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

Scheme 568

Scheme 569

1. DTC IS ACTIVE Ignition on, engine not running. With the scan tool, erase DTCs in the PCM. Attempt to start the engine and test drive the vehicle. With the scan tool, select View DTCs. Is the status Active for this DTC? Yes Go To 2 . No Perform the INTERMITTENT DTC diagnostic procedure. Refer to «INTERMITTENT DTC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
2. CHECK THE (K227) FUEL INJECTOR No. 1 HIGH-SIDE CONTROL CIRCUIT FOR AN OPEN/HIGH RESISTANCE Turn the ignition off. Disconnect the Fuel Injector No. 1 harness connector. Disconnect the PCM C2 harness connector. Measure the resistance of the (K227) Fuel Injector No. 1 High-Side Control circuit between the Fuel Injector No. 1 harness connector and the PCM C2 harness connector. Is the resistance below 5.0 Ohms? Yes Go To 3 . No Repair the (K227) Fuel Injector No. 1 High-Side Control circuit for an open or high resistance. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
3. CHECK THE (K611) FUEL INJECTOR No. 1 LOW-SIDE CONTROL CIRCUIT FOR AN OPEN/HIGH RESISTANCE Measure the resistance of the (K611) Fuel Injector No. 1 Low-Side Control circuit between the Fuel Injector No. 1 harness connector and the PCM C2 harness connector. Is the resistance below 5.0 Ohms? Yes Go To 4 . No Repair the (K611) Fuel Injector No. 1 Low-Side Control circuit for an open or high resistance. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
4. FUEL INJECTOR No. 1 Measure the resistance between the terminals of Fuel Injector No. 1. NOTE: Be sure to zero the meter before taking the measurement. A good Fuel Injector has approximately 0.5 Ohm of resistance when measured through it. Is the resistance below 1.0 Ohm? Yes Go To 5 . No Replace the Fuel Injector in accordance with the service information. Refer to «INJECTOR(S), FUEL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
5. POWERTRAIN CONTROL MODULE Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Fuel Injector and the Powertrain Control Module (PCM). Look for any chafed, pierced, pinched, or partially broken wires. Look for broken, bent, pushed out or corroded terminals. Perform any Technical Service Bulletins that may apply. Were any problems found? Yes Repair as necessary. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Replace the Powertrain Control Module in accordance with the service information. Refer to «MODULE, POWERTRAIN CONTROL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/communication-devices/#electronic-control-modules-service-information) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .

P0202-FUEL INJECTOR 2 CIRCUIT / OPEN

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article .

With the engine running.

The Powertrain Control Module (PCM) detects an open Fuel Injector 2 control circuit.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

Scheme 570

Scheme 571

1. DTC IS ACTIVE Ignition on, engine not running. With the scan tool, erase DTCs in the PCM. Attempt to start the engine and test drive the vehicle. With the scan tool, select View DTCs. Is the status Active for this DTC? Yes Go To 2 . No Perform the INTERMITTENT DTC diagnostic procedure. Refer to «INTERMITTENT DTC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
2. CHECK THE (K12) FUEL INJECTOR No. 2 HIGH-SIDE CONTROL CIRCUIT FOR AN OPEN/HIGH RESISTANCE Turn the ignition off. Disconnect the Fuel Injector No. 2 harness connector. Disconnect the PCM C2 harness connector. Measure the resistance of the (K12) Fuel Injector No. 2 High-Side Control circuit between the Fuel Injector No. 2 harness connector and the PCM C2 harness connector. Is the resistance below 5.0 Ohms? Yes Go To 3 . No Repair the (K12) Fuel Injector No. 2 High-Side Control circuit for an open or high resistance. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
3. CHECK THE (K612) FUEL INJECTOR No. 2 LOW-SIDE CONTROL CIRCUIT FOR AN OPEN/HIGH RESISTANCE Measure the resistance of the (K612) Fuel Injector No. 2 Low-Side Control circuit between the Fuel Injector No. 2 harness connector and the PCM C2 harness connector. Is the resistance below 5.0 Ohms? Yes Go To 4 . No Repair the (K612) Fuel Injector No. 2 Low-Side Control circuit for an open or high resistance. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
4. FUEL INJECTOR No. 2 Measure the resistance between the terminals of Fuel Injector No. 2. NOTE: Be sure to zero the meter before taking the measurement. A good Fuel Injector has approximately 0.5 Ohm of resistance when measured through it. Is the resistance below 1.0 Ohm? Yes Go To 5 . No Replace the Fuel Injector in accordance with the service information. Refer to «INJECTOR(S), FUEL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
5. POWERTRAIN CONTROL MODULE Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Fuel Injector No. 2 and the Powertrain Control Module (PCM). Look for any chafed, pierced, pinched, or partially broken wires. Look for broken, bent, pushed out or corroded terminals. Perform any Technical Service Bulletins that may apply. Were any problems found? Yes Repair as necessary. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Replace the Powertrain Control Module in accordance with the service information. Refer to «MODULE, POWERTRAIN CONTROL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/communication-devices/#electronic-control-modules-service-information) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .

P0203-FUEL INJECTOR 3 CIRCUIT / OPEN

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article .

With the engine running.

The Powertrain Control Module (PCM) detects an open Fuel Injector 3 control circuit.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

Scheme 572

1. DTC IS ACTIVE Ignition on, engine not running. With the scan tool, clear DTCs in the PCM. Attempt to start the engine and test drive the vehicle. With the scan tool, select view DTCs. Is the status active for this DTC? Yes Go To 2 . No Perform the INTERMITTENT DTC diagnostic procedure. Refer to «INTERMITTENT DTC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
2. CHECK THE (K227) FUEL INJECTOR No. 3 HIGH-SIDE CONTROL CIRCUIT FOR AN OPEN/HIGH RESISTANCE Turn the ignition off. Disconnect the Fuel Injector No. 3 harness connector. Disconnect the PCM C2 harness connector. Measure the resistance of the (K227) Fuel Injector No. 3 High-Side Control circuit between the Fuel Injector No. 3 harness connector and the PCM C2 harness connector. Is the resistance below 5.0 Ohms? Yes Go To 3 . No Repair the (K227) Fuel Injector No. 3 High-Side Control circuit for an open or high resistance. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
3. CHECK THE (K613) FUEL INJECTOR No. 3 LOW-SIDE CONTROL CIRCUIT FOR AN OPEN/HIGH RESISTANCE Measure the resistance of the (K613) Fuel Injector No. 3 Low-Side Control circuit between the Fuel Injector No. 3 harness connector and the PCM C2 harness connector. Is the resistance below 5.0 Ohms? Yes Go To 4 . No Repair the (K613) Fuel Injector No. 3 Low-Side Control circuit for an open or high resistance. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
4. FUEL INJECTOR No. 3 Measure the resistance between the terminals of Fuel Injector No. 3. NOTE: Be sure to zero the meter before taking the measurement. A good Fuel Injector has approximately 0.5 Ohm of resistance when measured through it. Is the resistance below 1.0 Ohm? Yes Go To 5 . No Replace the Fuel Injector in accordance with the service information. Refer to «INJECTOR(S), FUEL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
5. POWERTRAIN CONTROL MODULE Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Fuel Injector No. 3 and the Powertrain Control Module (PCM). Look for any chafed, pierced, pinched, or partially broken wires. Look for broken, bent, pushed out or corroded terminals. Monitor the scan tool data relative to this circuit and wiggle test the wiring and connectors. Look for the data to change or for the DTC to reset during the wiggle test. Perform any technical service bulletins that may apply. Were any problems found? Yes Repair as necessary. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Replace the Powertrain Control Module in accordance with the service information. Refer to «MODULE, POWERTRAIN CONTROL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/communication-devices/#electronic-control-modules-service-information) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .

P0204-FUEL INJECTOR 4 CIRCUIT / OPEN

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article .

With the engine running.

The Powertrain Control Module (PCM) detects an open Fuel Injector 4 control circuit.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

Scheme 573

Scheme 574

1. DTC IS ACTIVE Ignition on, engine not running. With the scan tool, clear DTCs in the PCM. Attempt to start the engine and test drive the vehicle. With the scan tool, select View DTCs. Is the status Active for this DTC? Yes Go To 2 . No Perform the INTERMITTENT DTC diagnostic procedure. Refer to «INTERMITTENT DTC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
2. CHECK THE (K229) FUEL INJECTOR No. 4 HIGH-SIDE CONTROL CIRCUIT FOR AN OPEN/HIGH RESISTANCE Turn the ignition off. Disconnect the Fuel Injector No. 4 harness connector. Disconnect the PCM C2 harness connector. Measure the resistance of the (K229) Fuel Injector No. 4 High-Side Control circuit between the Fuel Injector No. 4 harness connector and the PCM C2 harness connector. Is the resistance below 5.0 Ohms? Yes Go To 3 . No Repair the (K229) Fuel Injector No. 4 High-Side Control circuit for an open or high resistance. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
3. CHECK THE (K614) FUEL INJECTOR No. 4 LOW-SIDE CONTROL CIRCUIT FOR AN OPEN/HIGH RESISTANCE Measure the resistance of the (K614) Fuel Injector No. 4 Low-Side Control circuit between the Fuel Injector No. 4 harness connector and the PCM C2 harness connector. Is the resistance below 5.0 Ohms? Yes Go To 4 . No Repair the (K614) Fuel Injector No. 4 Low-Side Control circuit for an open or high resistance. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
4. FUEL INJECTOR No. 4 Measure the resistance between the terminals of Fuel Injector No. 4. NOTE: Be sure to zero the meter before taking the measurement. A good Fuel Injector has approximately 0.5 Ohm of resistance when measured through it. Is the resistance below 1.0 Ohm? Yes Go To 5 . No Replace the Fuel Injector in accordance with the service information. Refer to «INJECTOR(S), FUEL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
5. POWERTRAIN CONTROL MODULE Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Fuel Injector No. 4 and the Powertrain Control Module (PCM). Look for any chafed, pierced, pinched, or partially broken wires. Look for broken, bent, pushed out or corroded terminals. Monitor the scan tool data relative to this circuit and wiggle test the wiring and connectors. Look for the data to change or for the DTC to reset during the wiggle test. Perform any Technical Service Bulletins that may apply. Were any problems found? Yes Repair as necessary. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Replace the Powertrain Control Module in accordance with the service information. Refer to «MODULE, POWERTRAIN CONTROL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/communication-devices/#electronic-control-modules-service-information) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .

P0205-FUEL INJECTOR 5 CIRCUIT / OPEN

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article .

With the engine running.

The Powertrain Control Module (PCM) detects an open Fuel Injector 5 control circuit.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

Scheme 575

Scheme 576

1. DTC IS ACTIVE Ignition on, engine not running. With the scan tool, clear DTCs in the PCM. Attempt to start the engine and test drive the vehicle. With the scan tool, select View DTCs. Is the status Active for this DTC? Yes Go To 2 . No Perform the INTERMITTENT DTC diagnostic procedure. Refer to «INTERMITTENT DTC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
2. CHECK THE (K38) FUEL INJECTOR No. 5 HIGH-SIDE CONTROL CIRCUIT FOR AN OPEN/HIGH RESISTANCE Turn the ignition off. Disconnect the Fuel Injector No. 5 harness connector. Disconnect the PCM C2 harness connector. Measure the resistance of the (K38) Fuel Injector No. 5 High-Side Control circuit between the Fuel Injector No. 5 harness connector and the PCM C2 harness connector. Is the resistance below 5.0 Ohms? Yes Go To 3 . No Repair the (K38) Fuel Injector No. 5 High-Side Control circuit for an open or high resistance. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
3. CHECK THE (K638) FUEL INJECTOR No. 5 LOW-SIDE CONTROL CIRCUIT FOR AN OPEN/HIGH RESISTANCE Measure the resistance of the (K638) Fuel Injector No. 5 Low-Side Control circuit between the Fuel Injector No. 5 harness connector and the PCM C2 harness connector. Is the resistance below 5.0 Ohms? Yes Go To 4 . No Repair the (K638) Fuel Injector No. 5 Low-Side Control circuit for an open or high resistance. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
4. FUEL INJECTOR No. 5 Measure the resistance between the terminals of Fuel Injector No. 5. NOTE: Be sure to zero the meter before taking the measurement. A good Fuel Injector has approximately 0.5 Ohm of resistance when measured through it. Is the resistance below 1.0 Ohm? Yes Go To 5 . No Replace the Fuel Injector in accordance with the service information. Refer to «INJECTOR(S), FUEL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
5. POWERTRAIN CONTROL MODULE Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Fuel Injector No. 5 and the Powertrain Control Module (PCM). Look for any chafed, pierced, pinched, or partially broken wires. Look for broken, bent, pushed out or corroded terminals. Monitor the scan tool data relative to this circuit and wiggle test the wiring and connectors. Look for the data to change or for the DTC to reset during the wiggle test. Perform any Technical Service Bulletins that may apply. Were any problems found? Yes Repair as necessary. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Replace the Powertrain Control Module in accordance with the service information. Refer to «MODULE, POWERTRAIN CONTROL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/communication-devices/#electronic-control-modules-service-information) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .

P0206-FUEL INJECTOR 6 CIRCUIT / OPEN

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article .

With the engine running.

The Powertrain Control Module (PCM) detects an open Fuel Injector 6 control circuit.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

Scheme 577

1. DTC IS ACTIVE Ignition on, engine not running. With the scan tool, clear DTCs in the PCM. Attempt to start the engine and test drive the vehicle. With the scan tool, select View DTCs. Is the status Active for this DTC? Yes Go To 2 . No Perform the INTERMITTENT DTC diagnostic procedure. Refer to «INTERMITTENT DTC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
2. CHECK THE (K229) FUEL INJECTOR No. 6 HIGH-SIDE CONTROL CIRCUIT FOR AN OPEN/HIGH RESISTANCE Turn the ignition off. Disconnect the Fuel Injector No. 6 harness connector. Disconnect the PCM C2 harness connector. Measure the resistance of the (K229) Fuel Injector No. 6 High-Side Control circuit between the Fuel Injector No. 6 harness connector and the PCM C2 harness connector. Is the resistance below 5.0 Ohms? Yes Go To 3 . No Repair the (K229) Fuel Injector No. 6 High-Side Control circuit for an open or high resistance. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
3. CHECK THE (K658) FUEL INJECTOR No. 6 LOW-SIDE CONTROL CIRCUIT FOR AN OPEN/HIGH RESISTANCE Measure the resistance of the (K658) Fuel Injector No. 6 Low-Side Control circuit between the Fuel Injector No. 6 harness connector and the PCM C2 harness connector. Is the resistance below 5.0 Ohms? Yes Go To 4 . No Repair the (K658) Fuel Injector No. 6 Low-Side Control circuit for an open or high resistance. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
4. FUEL INJECTOR No. 6 Measure the resistance between the terminals of Fuel Injector No. 6. NOTE: Be sure to zero the meter before taking the measurement. A good Fuel Injector has approximately 0.5 Ohm of resistance when measured through it. Is the resistance below 1.0 Ohm? Yes Go To 5 . No Replace the Fuel Injector in accordance with the service information. Refer to «INJECTOR(S), FUEL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
5. POWERTRAIN CONTROL MODULE Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Fuel Injector No. 4 and the Powertrain Control Module (PCM). Look for any chafed, pierced, pinched, or partially broken wires. Look for broken, bent, pushed out or corroded terminals. Monitor the scan tool data relative to this circuit and wiggle test the wiring and connectors. Look for the data to change or for the DTC to reset during the wiggle test. Perform any Technical Service Bulletins that may apply. Were any problems found? Yes Repair as necessary. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Replace the Powertrain Control Module in accordance with the service information. Refer to «MODULE, POWERTRAIN CONTROL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/communication-devices/#electronic-control-modules-service-information) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .

P020A-CYLINDER 1 INJECTION TIMING

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article .

With the engine running.

The Powertrain Control Module (PCM) detects that the Fuel Injector closing time exceeds the calibrated limit.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

1. DTC IS ACTIVE Ignition on, engine not running. With the scan tool, erase DTCs in the PCM. Test drive the vehicle. With the scan tool, select View DTCs. Is the status Active for this DTC? Yes Replace the Fuel Injector 1 in accordance with the service information. Refer to «INJECTOR(S), FUEL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Perform the INTERMITTENT DTC diagnostic procedure. Refer to «INTERMITTENT DTC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .

P020B-CYLINDER 2 INJECTION TIMING

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article .

With the engine running.

The Powertrain Control Module (PCM) detects that the Fuel Injector closing time exceeds the calibrated limit.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

1. DTC IS ACTIVE Ignition on, engine not running. With the scan tool, erase DTCs in the PCM. Attempt to start the engine and test drive the vehicle. With the scan tool, select View DTCs. Is the status Active for this DTC? Yes Replace the Fuel Injector 2 in accordance with the service information. Refer to «INJECTOR(S), FUEL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Perform the INTERMITTENT DTC diagnostic procedure. Refer to «INTERMITTENT DTC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .

P0203-CYLINDER 3 INJECTION TIMING

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article .

With the engine running.

The Powertrain Control Module (PCM) detects that the Fuel Injector closing time exceeds the calibrated limit.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

1. DTC IS ACTIVE Ignition on, engine not running. With the scan tool, erase DTCs in the PCM. Attempt to start the engine and test drive the vehicle. With the scan tool, select View DTCs. Is the status Active for this DTC? Yes Replace the Fuel Injector 3 in accordance with the service information. Refer to «INJECTOR(S), FUEL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Perform the INTERMITTENT DTC diagnostic procedure. Refer to «INTERMITTENT DTC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .

P020D-CYLINDER 4 INJECTION TIMING

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article .

With the engine running.

The Powertrain Control Module (PCM) detects that the Fuel Injector closing time exceeds the calibrated limit.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

1. DTC IS ACTIVE Ignition on, engine not running. With the scan tool, erase DTCs in the PCM. Attempt to start the engine and test drive the vehicle. With the scan tool, select View DTCs. Is the status Active for this DTC? Yes Replace the Fuel Injector 4 in accordance with the service information. Refer to «INJECTOR(S), FUEL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Perform the INTERMITTENT DTC diagnostic procedure. Refer to «INTERMITTENT DTC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .

P020E-CYLINDER 5 INJECTION TIMING

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article .

With the engine running.

The Powertrain Control Module (PCM) detects that the Fuel Injector closing time exceeds the calibrated limit.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

1. DTC IS ACTIVE Ignition on, engine not running. With the scan tool, erase DTCs in the PCM. Attempt to start the engine and test drive the vehicle. With the scan tool, select View DTCs. Is the status Active for this DTC? Yes Replace the Fuel Injector 5 in accordance with the service information. Refer to «INJECTOR(S), FUEL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Perform the INTERMITTENT DTC diagnostic procedure. Refer to «INTERMITTENT DTC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .

P020F-CYLINDER 6 INJECTION TIMING

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article .

With the engine running.

The Powertrain Control Module (PCM) detects that the Fuel Injector closing time exceeds the calibrated limit.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

1. DTC IS ACTIVE Ignition on, engine not running. With the scan tool, erase DTCs in the PCM. Attempt to start the engine and test drive the vehicle. With the scan tool, select View DTCs. Is the status Active for this DTC? Yes Replace the Fuel Injector 6 in accordance with the service information. Refer to «INJECTOR(S), FUEL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Perform the INTERMITTENT DTC diagnostic procedure. Refer to «INTERMITTENT DTC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .

P0219-ENGINE OVERSPEED CONDITION

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article .

With the engine running.

The Crank Position Sensor (CKP) indicates engine speed is at or above the calibrated threshold for 0.05 second. NOTE: Engine damage is possible when the engine speed exceeds 4800 RPM.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

1. CHECK FOR ACTIVE DTC Turn the ignition off. Check the CKP Sensor wiring between the Powertrain Control Module (PCM) and CKP Sensor harness connectors for poor terminal contact, corrosion or other problems that may cause erratic CKP Sensor signals. Check the CKP Sensor for damage and proper mounting. Were there any signs of damage? Yes Repair or replace as necessary. Use the service information to check for engine mechanical problems that may have occurred due to excessive engine speed. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Test complete.

P0234-TURBOCHARGER OVERBOOST CONDITION

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article .

With the engine running and the Powertrain Control Module (PCM) attempting to govern Turbocharger boost pressure.

The Boost Pressure Sensor indicates actual Turbocharger boost pressure is greater than the PCM set point for engine boost for five seconds.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

1. CHECK FOR ACTIVE DTC Turn the ignition on. With the scan tool, erase DTCs in the PCM. Test drive the vehicle. With the scan tool, select View DTCs. Is the status Active for this DTC? Yes Go To 2 . No Perform the INTERMITTENT DTC diagnostic procedure. Refer to «INTERMITTENT DTC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
2. CHECK THE AIR FILTER Turn the ignition off. Remove and inspect the Air Filter for soiling or excessive dirt and debris which may cause air flow restriction. Were any of these problems found? Yes Replace the Air Filter element in accordance with the service information. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Go To 3 .
3. CHECK FOR AN AIR RESTRICTION Inspect all air intake, crankcase vent, charge air cooler and Turbocharger related tubes and hoses for damage, restrictions or poor connections or leaks. Inspect the exhaust system and related tubes for damage, restrictions or poor connections. Were any problems found? Yes Repair or replace as necessary. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Replace the Turbocharger assembly in accordance with the service information. Refer to «TURBOCHARGER, REMOVAL»(ref-466389-S05125519972012042500000) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .

P0237-TURBO BOOST PRESSURE SENSOR CIRCUIT LOW

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article .

The Boost Pressure Sensor is combined with the Intake Air Temperature (IAT) Sensor 2. It is used to measure the pressure of the air entering the Turbocharger. The Boost Pressure Sensor operates as a typical three wire sensor. It receives a 5-Volt feed on the (K668) Boost Pressure Sensor 5-Volt Supply circuit and shares the (K690) ground circuit with the Intake Air Temperature Sensor. The Powertrain Control Module (PCM) receives a signal from the sensor via the (K37) Boost Pressure Sensor Signal circuit.

With the ignition on.

The (K37) Boost Pressure Sensor Signal circuit voltage is below the calibrated threshold for 0.5 second.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

Scheme 578

Scheme 579

Scheme 580

Scheme 581

1. DTC IS ACTIVE NOTE: If any Sensor Reference DTCs are present, perform those diagnostic procedures before continuing with this test. Ignition on, engine not running. With the scan tool, select View DTCs. Is the status Active for this DTC? Yes Go To 2 . No Perform the INTERMITTENT DTC diagnostic procedure. Refer to «INTERMITTENT DTC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
2. CHECK THE (K668) BOOST PRESSURE/INTAKE AIR TEMPERATURE SENSOR 5-VOLT SUPPLY CIRCUIT VOLTAGE Turn the ignition off. Disconnect the Boost Pressure/Intake Air Temperature Sensor harness connector. Turn the ignition on. Measure the voltage of the (K668) Boost Pressure/Intake Air Temperature Sensor 5-Volt Supply circuit in the Boost Pressure/Intake Air Temperature Sensor harness connector. Is the voltage above 4.8 Volts? Yes Go To 3 . No Repair the (K668) Boost Pressure/Intake Air Temperature Sensor 5-Volt Supply circuit for an open circuit. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
3. CHECK THE (K37) BOOST PRESSURE SENSOR SIGNAL CIRCUIT FOR A SHORT TO GROUND Turn the ignition off. Disconnect the PCM C2 harness connector. Measure the resistance between ground and the (K37) Boost Pressure Sensor Signal circuit at the Boost Pressure/Intake Air Temperature Sensor harness connector. Is the resistance above 10k Ohms? Yes Go To 4 . No Repair the (K37) Boost Pressure Sensor Signal circuit for a short to ground. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
4. CHECK FOR THE (K37) BOOST PRESSURE SENSOR SIGNAL CIRCUIT SHORTED TO THE (K690) BOOST PRESSURE/INTAKE AIR TEMPERATURE SENSOR GROUND CIRCUIT Measure the resistance between the (K37) Boost Pressure Sensor Signal circuit and the (K690) Boost Pressure/Intake Air Temperature Sensor Ground circuit at the Boost Pressure/Intake Air Temperature Sensor harness connector. Is the resistance above 10k Ohms? Yes Go To 5 . No Repair the (K37) Boost Pressure Sensor Signal circuit for a short to the (K690) Boost Pressure Sensor Ground circuit. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
5. CHECK THE (K37) BOOST PRESSURE SENSOR SIGNAL CIRCUIT FOR AN OPEN/HIGH RESISTANCE Measure the resistance of the (K37) Boost Pressure Sensor Signal circuit between the Boost Pressure/Intake Air Temperature Sensor harness connector and the PCM C2 harness connector. Is the resistance below 5.0 Ohms? Yes Go To 6 . No Repair the (K37) Boost Pressure Sensor Signal circuit for an open or high resistance. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
6. BOOST PRESSURE/INTAKE AIR TEMPERATURE SENSOR Reconnect the Boost Pressure/Intake Air Temperature Sensor harness connector. Reconnect the PCM C2 harness connector. Turn the ignition on. With the scan tool, erase DTCs. Turn the ignition off. Disconnect the Boost Pressure/Intake Air Temperature Sensor harness connector. Connect a jumper between the (K37) Boost Pressure Sensor Signal circuit and the (K668) Boost Pressure/Intake Air Temperature 5-Volt Supply circuit at the Boost Pressure/Intake Air Temperature Sensor harness connector. Turn the ignition on. With the scan tool, select View DTCs. NOTE: The scan tool should display a P0238-Turbo Boost Pressure Sensor High DTC as active or pending with the jumper in place. Does the scan tool display the DTC as described above? Yes Replace the Boost Pressure/Intake Air Temperature Sensor in accordance with the service information. Refer to «SENSOR, BOOST PRESSURE, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Go To 7 .
7. POWERTRAIN CONTROL MODULE Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Boost Pressure/Intake Air Temperature Sensor and the Powertrain Control Module. Look for any chafed, pierced, pinched, or partially broken wires. Look for broken, bent, pushed out or corroded terminals. Perform any Technical Service Bulletins that may apply. Were any problems found? Yes Repair as necessary. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Replace the Powertrain Control Module in accordance with the service information. Refer to «MODULE, POWERTRAIN CONTROL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/communication-devices/#electronic-control-modules-service-information) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .

P0238-TURBO BOOST PRESSURE SENSOR CIRCUIT HIGH

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article .

The Boost Pressure Sensor is combined with the Intake Air Temperature (IAT) Sensor 2. It is used to measure the pressure of the air entering the Turbocharger. The Boost Pressure Sensor operates as a typical three wire sensor. It receives a 5-Volt feed on the (K668) Boost Pressure Sensor 5-Volt Supply circuit and shares the (K690) ground circuit with the Intake Air Temperature Sensor. The Powertrain Control Module (PCM) receives a signal from the sensor via the (K37) Boost Pressure Sensor Signal circuit.

With the ignition on.

The (K37) Boost Pressure Sensor Signal circuit voltage is above the calibrated threshold for 2.0 seconds.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

Scheme 582

1. DTC IS ACTIVE NOTE: If any Sensor Reference DTCs are present, perform those diagnostic procedures before continuing with this test. Ignition on, engine not running. With the scan tool, select View DTCs. Is the status Active for this DTC? Yes Go To 2 . No Perform the INTERMITTENT DTC diagnostic procedure. Refer to «INTERMITTENT DTC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
2. CHECK THE (K668) BOOST PRESSURE/INTAKE AIR TEMPERATURE 5-VOLT SUPPLY CIRCUIT Turn the ignition off. Disconnect the Boost Pressure/Intake Air Temperature Sensor harness connector. Turn the ignition on. Measure the voltage of the (K668) Boost Pressure Sensor 5-Volt Supply circuit at the Boost Pressure/Intake Air Temperature Sensor harness connector. Is the voltage above 5.2 Volts? Yes Go To 3 . No Repair the (K668) Boost Pressure/Intake Air Temperature Sensor 5-Volt Supply circuit for a short to voltage. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
3. CHECK THE (K37) BOOST PRESSURE SENSOR SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE Measure the voltage of the (K37) Boost Pressure Sensor Signal circuit in the Boost Pressure/Intake Air Temperature Sensor harness connector. Is there any voltage present? Yes Repair the (K37) Boost Pressure Sensor Signal circuit for a short to voltage. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Go To 4 .
4. CHECK THE (K690) BOOST PRESSURE/INTAKE AIR TEMPERATURE SENSOR GROUND CIRCUIT FOR AN OPEN/HIGH RESISTANCE Turn the ignition off. Disconnect the PCM C2 harness connector. Measure the resistance of the (K690) Boost Pressure/Intake Air Temperature Sensor Ground circuit between the Boost Pressure/Intake Air Temperature Sensor harness connector and the PCM C2 harness connector. Is the resistance below 5.0 Ohms? Yes Go To 5 . No Repair the (K690) Boost Pressure/Intake Air Temperature Sensor Ground circuit for an open or high resistance. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
5. CHECK THE BOOST PRESSURE SENSOR Turn the ignition off. Reconnect the Boost Pressure/Intake Air Temperature Sensor harness connector. Reconnect the PCM C2 harness connector. Turn the ignition on. With the scan tool, erase DTCs. Turn the ignition off. Disconnect the Boost Pressure/Intake Air Temperature Sensor harness connector. Connect a jumper between the (K690) Boost Pressure/Intake Air Temperature Sensor Ground circuit and the (K37) Boost Pressure Sensor Signal circuit in the Boost Pressure/Intake Air Temperature Sensor harness connector. Turn the ignition on. With the scan tool, select View DTCs. NOTE: The scan tool should display a P0237-Turbo Boost Pressure Sensor Low DTC as active or pending with the jumper in place. Does the scan tool display the DTC as described above? Yes Replace the Boost Pressure/Intake Air Temperature Sensor in accordance with the service information. Refer to «SENSOR, BOOST PRESSURE, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Go To 6 .
6. POWERTRAIN CONTROL MODULE Using the wiring diagram/schematic as a guide, inspect the wiring and connectors the Boost Pressure/Intake Air Temperature Sensor and the Powertrain Control Module (PCM). Look for any chafed, pierced, pinched, or partially broken wires. Look for broken, bent, pushed out or corroded terminals. Perform any Technical Service Bulletins that may apply. Were any problems found? Yes Repair as necessary. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Replace the Powertrain Control Module in accordance with the service information. Refer to «MODULE, POWERTRAIN CONTROL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/communication-devices/#electronic-control-modules-service-information) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .

P0251-INJECTION PUMP FUEL METERING CONTROL CIRCUIT OPEN

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article .

The Fuel Quantity Solenoid (FQS) works in tandem with the Fuel Pressure Regulator (FPR) to control fuel volume and pressure in the Fuel Rail. The FQS is positioned in the inlet side of the High Pressure Delivery Pump (HPDP). The solenoid receives both the 12 Volt supply and a duty-cycle ground signal from the PCM. The PCM meters the amount of fuel entering the pumping chambers inside the HPDP. The FPR is positioned at the return passage of the Fuel Rail. The solenoid receives both the 12 Volt supply and a duty-cycle ground signal from the PCM. The FPR is normally open when not being controlled by the PCM. The Fuel Rail return passage opens allowing fuel pressure in the rail to escape into the return circuit and on to the Fuel Tank. When the PCM is controlling the FPR signal, the solenoid valve closes allowing fuel pressure to build in the rail.

With the ignition on.

The Powertrain Control Module (PCM) detects an open on the Fuel Quantity Solenoid Control circuit for 0.2 second.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

Scheme 583

Scheme 584

1. DTC IS ACTIVE Ignition on, engine not running. With the scan tool, erase DTCs in the Powertrain Control Module (PCM). Start the engine or crank the engine for 10 seconds. With the scan tool, select View DTCs. Is the status Active for this DTC? Yes Go To 2 . No Perform the INTERMITTENT DTC diagnostic procedure. Refer to «INTERMITTENT DTC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
2. CHECK THE (K366) FUEL QUANTITY SOLENOID RETURN CIRCUIT FOR OPEN/HIGH RESISTANCE Turn the ignition off. Disconnect the Fuel Quantity Solenoid harness connector. Disconnect the PCM C2 harness connector. Measure the resistance of the (K366) Fuel Quantity Solenoid Return circuit between the Fuel Quantity Solenoid harness connector and the PCM C2 harness connector. Is the resistance below 5.0 Ohms? Yes Go To 3 . No Repair the (K366) Fuel Quantity Solenoid Return circuit for an open or short to ground condition. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
3. CHECK THE (K365) FUEL QUANTITY SOLENOID DRIVER CIRCUIT FOR AN OPEN/HIGH RESISTANCE Measure the resistance of the (K365) Fuel Quantity Solenoid Driver circuit between the Fuel Quantity Solenoid harness connector and the PCM C2 harness connector. Is the resistance below 5.0 Ohms? Yes Go To 4 . No Repair the (K365) Fuel Quantity Solenoid Driver circuit for an open or high resistance. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
4. FUEL QUANTITY SOLENOID Reconnect the PCM C2 harness connector. Reconnect the Fuel Control Actuator harness connector. Turn the ignition on. With the scan tool, select Erase DTCs. Turn the ignition off. Disconnect the Fuel Quantity Solenoid harness connector. Connect a jumper between ground and the (K365) Fuel Quantity Solenoid Driver circuit at the Fuel Control Actuator harness connector. With the scan tool, select View DTCs. NOTE: The P0252-Injection Pump Fuel Metering Control Circuit Low DTC should be active or pending with the jumper in place. Did the DTC set as described above? Yes Replace the Fuel Quantity Solenoid in accordance with the service information. Refer to «SOLENOID, FUEL QUANTITY, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Go To 5 .
5. POWERTRAIN CONTROL MODULE Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Fuel Quantity Solenoid and the Powertrain Control Module (PCM). Look for any chafed, pierced, pinched, or partially broken wires. Look for broken, bent, pushed out or corroded terminals. Perform any Technical Service Bulletins that may apply. Were any problems found? Yes Repair as necessary. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Replace the Powertrain Control Module in accordance with the service information. Refer to «MODULE, POWERTRAIN CONTROL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/communication-devices/#electronic-control-modules-service-information) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .

P0253-INJECTION PUMP FUEL METERING CONTROL CIRCUIT LOW

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article .

The Fuel Quantity Solenoid (FQS) works in tandem with the Fuel Pressure Regulator (FPR) to control fuel volume and pressure in the Fuel Rail. The FQS is positioned in the inlet side of the High Pressure Delivery Pump (HPDP). The solenoid receives both the 12 Volt supply and a duty-cycle ground signal from the Powertrain Control Module (PCM). The PCM meters the amount of fuel entering the pumping chambers inside the HPDP. The FPR is positioned at the return passage of the Fuel Rail. The solenoid receives both the 12 Volt supply and a duty-cycle ground signal from the PCM. The FPR is normally open when not being controlled by the PCM. The Fuel Rail return passage opens allowing fuel pressure in the rail to escape into the return circuit and on to the Fuel Tank. When the PCM is controlling the FPR signal, the solenoid valve closes allowing fuel pressure to build in the rail.

With the ignition on.

The Powertrain Control Module (PCM) detects that the Fuel Quantity Solenoid Control circuit is shorted to ground for 0.20 second.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

Scheme 585

Scheme 586

1. DTC IS ACTIVE Ignition on, engine not running. With the scan tool, erase DTCs in the PCM. Start the engine and test drive the vehicle if necessary. Monitor the scan tool for at least two minutes. With the scan tool, select View DTCs. Is the status Active for this DTC? Yes Go To 2 . No Perform the INTERMITTENT DTC diagnostic procedure. Refer to «INTERMITTENT DTC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
2. CHECK THE (K366) FUEL QUANTITY SOLENOID RETURN CIRCUIT FOR A SHORT TO GROUND Turn the ignition off. Disconnect the Fuel Quantity Solenoid harness connector. Disconnect the PCM C2 harness connector. Measure the resistance between ground and the (K366) Fuel Quantity Solenoid Return circuit at the Fuel Quantity Solenoid harness connector. Is the resistance above 10k Ohms? Yes Go To 3 . No Repair the (K366) Fuel Quantity Solenoid Return circuit for an open circuit or short to ground condition. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
3. CHECK THE (K365) FUEL QUANTITY SOLENOID DRIVER CIRCUIT FOR A SHORT TO GROUND Measure the resistance between ground and the (K365) Fuel Quantity Solenoid Driver circuit at the Fuel Quantity Solenoid harness connector. Is the resistance above 10k Ohms? Yes Go To 4 . No Repair the (K365) Fuel Quantity Solenoid Driver circuit for a short to ground. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
4. FUEL QUANTITY SOLENOID Reconnect the PCM C2 harness connector. Reconnect the Fuel Control Actuator harness connector. Turn the ignition on. With the scan tool, select Erase DTCs. Turn the ignition off. Disconnect the Fuel Quantity Solenoid harness connector. With the scan tool, select View DTCs. NOTE: The P0251-Injection Pump Fuel Metering Control Circuit Open DTC should be active or pending with the harness connector unplugged. Did the DTC set as described above? Yes Replace the Fuel Quantity Solenoid in accordance with the service information. Refer to «SOLENOID, FUEL QUANTITY, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Go To 5 .
5. POWERTRAIN CONTROL MODULE Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Fuel Quantity Solenoid and the Powertrain Control Module (PCM). Look for any chafed, pierced, pinched, or partially broken wires. Look for broken, bent, pushed out or corroded terminals. Perform any Technical Service Bulletins that may apply. Were any problems found? Yes Repair as necessary. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Replace the Powertrain Control Module in accordance with the service information. Refer to «MODULE, POWERTRAIN CONTROL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/communication-devices/#electronic-control-modules-service-information) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .

P0254-INJECTION PUMP FUEL METERING CONTROL CIRCUIT HIGH

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article .

The Fuel Quantity Solenoid (FQS) works in tandem with the Fuel Pressure Regulator (FPR) to control fuel volume and pressure in the Fuel Rail. The FQS is positioned in the inlet side of the High Pressure Delivery Pump (HPDP). The solenoid receives both the 12 Volt supply and a duty-cycle ground signal from the PCM. The PCM meters the amount of fuel entering the pumping chambers inside the HPDP. The FPR is positioned at the return passage of the Fuel Rail. The solenoid receives both the 12 Volt supply and a duty-cycle ground signal from the PCM. The FPR is normally open when not being controlled by the PCM. The Fuel Rail return passage opens allowing fuel pressure in the rail to escape into the return circuit and on to the Fuel Tank. When the PCM is controlling the FPR signal, the solenoid valve closes allowing fuel pressure to build in the rail.

With the ignition on.

The Powertrain Control Module (PCM) detects that the Fuel Quantity Solenoid Control circuit is shorted to voltage for 0.20 second.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

Scheme 587

Scheme 588

1. DTC IS ACTIVE Ignition on, engine not running. With the scan tool, erase DTCs in the PCM. Start the engine and test drive the vehicle if necessary. Monitor the scan tool for at least two minutes. With the scan tool, select View DTCs. Is the status Active for this DTC? Yes Go To 2 . No Perform the INTERMITTENT DTC diagnostic procedure. Refer to «INTERMITTENT DTC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
2. CHECK THE (K365) FUEL QUANTITY SOLENOID DRIVER CIRCUIT FOR A SHORT TO VOLTAGE Turn the ignition off. Disconnect the Fuel Quantity Solenoid harness connector. Disconnect the PCM C2 harness connector. Remove the ASD Relay from the TIPM. Connect a jumper wire between cavity 30 and cavity 87 of the ASD Relay connector. Turn the ignition on. Measure the voltage of the (K365) Fuel Quantity Solenoid Driver circuit in the Boost Pressure Actuator harness connector. Is there any voltage present? Yes Go To 3 . No Repair the (K365) Fuel Quantity Solenoid Driver circuit for a short to voltage. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
3. CHECK THE (K366) FUEL QUANTITY SOLENOID RETURN CIRCUIT FOR A SHORT TO VOLTAGE Measure the voltage of the (K366) Fuel Quantity Solenoid Return circuit in the Boost Pressure Actuator harness connector. Is there any voltage present? Yes Go To 4 . No Repair the (K365) Fuel Quantity Solenoid Return circuit for a short to voltage. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
4. FUEL QUANTITY SOLENOID Reconnect the PCM C2 harness connector. Reconnect the Fuel Control Actuator harness connector. Turn the ignition on. With the scan tool, select Erase DTCs. Turn the ignition off. Disconnect the Fuel Quantity Solenoid harness connector. With the scan tool, select View DTCs. NOTE: The P0251-Injection Pump Fuel Metering Control Circuit Open DTC should be active or pending with the harness connector unplugged. Did the DTC set as described above? Yes Replace the Fuel Quantity Solenoid in accordance with the service information. Refer to «SOLENOID, FUEL QUANTITY, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Go To 5 .
5. POWERTRAIN CONTROL MODULE Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Fuel Quantity Solenoid and the Powertrain Control Module (PCM). Look for any chafed, pierced, pinched, or partially broken wires. Look for broken, bent, pushed out or corroded terminals. Perform any Technical Service Bulletins that may apply. Were any problems found? Yes Repair as necessary. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Replace the Powertrain Control Module in accordance with the service information. Refer to «MODULE, POWERTRAIN CONTROL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/communication-devices/#electronic-control-modules-service-information) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .

P0257-INJECTION PUMP FUEL METERING CONTROL CIRCUIT PERFORMANCE

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article .

The Fuel Quantity Solenoid (FQS) works in tandem with the Fuel Pressure Regulator (FPR) to control fuel volume and pressure in the Fuel Rail. The FQS is positioned in the inlet side of the High Pressure Delivery Pump (HPDP). The solenoid receives both the 12 Volt supply and a duty-cycle ground signal from the PCM. The PCM meters the amount of fuel entering the pumping chambers inside the HPDP. The FPR is positioned at the return passage of the Fuel Rail. The solenoid receives both the 12 Volt supply and a duty-cycle ground signal from the PCM. The FPR is normally open when not being controlled by the PCM. The Fuel Rail return passage opens allowing fuel pressure in the rail to escape into the return circuit and on to the Fuel Tank. When the PCM is controlling the FPR signal, the solenoid valve closes allowing fuel pressure to build in the rail.

With the ignition on.

The Powertrain Control Module (PCM) detects an open on the Fuel Quantity Solenoid Control circuit for 0.2 second.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

1. DTC IS ACTIVE Ignition on, engine not running. With the scan tool, erase DTCs in the Powertrain Control Module (PCM). Start the engine or crank the engine for 10 seconds. With the scan tool, select View DTCs. Is the status Active for this DTC? Yes Go To 2 . No Perform the INTERMITTENT DTC diagnostic procedure. Refer to «INTERMITTENT DTC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
2. CHECK THE (K366) FUEL QUANTITY SOLENOID RETURN CIRCUIT FOR AN OPEN/HIGH RESISTANCE Turn the ignition off. Disconnect the Fuel Quantity Solenoid harness connector. Disconnect the PCM C2 harness connector. Measure the resistance of the (K366) Fuel Quantity Solenoid Return circuit between the Fuel Quantity Solenoid harness connector and the PCM C2 harness connector. Is the resistance below 5.0 Ohms? Yes Go To 3 . No Repair the (K366) Fuel Quantity Solenoid Return circuit for an open or short to ground condition. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
3. CHECK THE (K365) FUEL QUANTITY SOLENOID DRIVER CIRCUIT FOR AN OPEN/HIGH RESISTANCE Measure the resistance of the (K365) Fuel Quantity Solenoid Driver circuit between the Fuel Quantity Solenoid harness connector and the PCM C2 harness connector. Is the resistance below 5.0 Ohms? Yes Go To 4 . No Repair the (K365) Fuel Quantity Solenoid Driver circuit for an open or high resistance. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
4. FUEL QUANTITY SOLENOID Reconnect the PCM C2 harness connector. Reconnect the Fuel Control Actuator harness connector. Turn the ignition on. With the scan tool, select Erase DTCs. Turn the ignition off. Disconnect the Fuel Quantity Solenoid harness connector. Connect a jumper between ground and the (K365) Fuel Quantity Solenoid Driver circuit at the Fuel Control Actuator harness connector. With the scan tool, select View DTCs. NOTE: The P0252-Injection Pump Fuel Metering Control Circuit Low DTC should be active or pending with the jumper in place. Did the DTC set as described above? Yes Replace the Fuel Quantity Solenoid in accordance with the service information. Refer to «SOLENOID, FUEL QUANTITY, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Go To 5 .
5. POWERTRAIN CONTROL MODULE Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Fuel Quantity Solenoid and the Powertrain Control Module (PCM). Look for any chafed, pierced, pinched, or partially broken wires. Look for broken, bent, pushed out or corroded terminals. Perform any Technical Service Bulletins that may apply. Were any problems found? Yes Repair as necessary. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Replace the Powertrain Control Module in accordance with the service information. Refer to «MODULE, POWERTRAIN CONTROL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/communication-devices/#electronic-control-modules-service-information) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .

P0262-FUEL INJECTOR 1 CIRCUIT HIGH

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article .

With the engine cranking or running.

The Powertrain Control Module (PCM) detects a short on the Fuel Injector Control circuit.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

1. VERIFY ACTIVE DTC Turn the ignition on. With the scan tool, erase the PCM DTCs. Attempt to start the engine and test drive the vehicle. With the scan tool, read the PCM DTCs. Did this DTC return? Yes Go To 2 . No Perform the INTERMITTENT DTC diagnostic procedure. Refer to «INTERMITTENT DTC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
2. CHECKING FOR OTHER DTCS NOTE: An open ASD power supply to the PCM will cause multiple DTCs including this DTC to set. NOTE: Check the PCM for other DTCs. If other DTCs are set with this DTC refer to the symptom list and perform the CHECKING THE PCM POWER AND GROUND CIRCUITS test before continuing. Refer to «CHECKING THE PCM POWER AND GROUND CIRCUITS»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#driveability-diesel-non-dtc-based-diagnostics) . If the PCM power and ground circuits are functioning properly continue with this test. Yes Go To 3 .
3. CHECK THE FUEL INJECTOR CONTROL CIRCUITS FOR A SHORT TO VOLTAGE Turn the ignition off. Disconnect all of the Fuel Injector harness connectors. Disconnect the PCM C2 harness connector. Remove the ASD Relay from the TIPM. Connect a jumper wire between cavity 30 and cavity 87 of the ASD Relay connector. Turn the ignition on. Measure the voltage of each Fuel Injector High-Side Control circuit. Measure the voltage of each Fuel Injector Low-Side Control circuit. Is the voltage above 1.0 Volt for any of the measurements? Yes Repair the appropriate Fuel Injector Control circuit for a short to voltage. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Go To 4 .
4. CHECK THE FUEL INJECTOR CONTROL CIRCUITS FOR A SHORT TO GROUND Turn the ignition off. Remove the jumper wire and install the ASD Relay. Measure the resistance between ground and each Fuel Injector High-Side Control circuit. Measure the resistance between ground and each Fuel Injector Low-Side Control circuit. Is the resistance below 10k Ohms for any of the measurements? Yes Repair the Fuel Injector Control circuit for a short to ground. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Go To 5 .
5. FUEL INJECTOR CIRCUITS SHORTED TOGETHER Measure the resistance between each of the Fuel Injector High-Side Control circuits and the Fuel Injector Low-Side Control circuits. Is the resistance below 10k Ohms for any of the measurements? Yes Repair the Fuel Injector circuits that measured below 10k Ohms for a short together. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Go To 6 .
6. CHECK THE FUEL INJECTOR CONTROL CIRCUIT FOR AN OPEN/HIGH RESISTANCE Measure the resistance of each Fuel Injector High-Side and Low-Side Control circuits between its respective injector harness connector and the PCM C2 harness connector. Is the resistance below 5.0 Ohms for each measurement? Yes Go To 7 . No Repair the Fuel Injector Control circuit that measured above 5.0 Ohms for an open or high resistance. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
7. CHECK THE FUEL INJECTOR FOR AN INTERNAL SHORT TO GROUND Measure the resistance between ground and either terminal of each Fuel Injector. Is the resistance above 10k Ohms for each measurement? Yes Go To 8 . No Replace the Fuel Injector that did not measure above 10k Ohms to ground. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
8. CHECK FUEL INJECTOR RESISTANCE Measure the resistance of each Fuel Injector (measure across both terminals of the injector). NOTE: Be sure to zero the meter before taking the measurement. A good Fuel Injector has approximately 0.5 Ohm of resistance when measured through it. Is the resistance below 1.0 Ohm for all? Yes Go To 9 . No Replace the Fuel Injector that did not measure below 1.0 Ohm. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
9. MULTIPLE FUEL INJECTOR DTCS Were there multiple Fuel Injector DTCs set in the PCM? Yes Go To 10 . No Replace the Fuel Injector 1 in accordance with the service information. Refer to «INJECTOR(S), FUEL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
10. FUEL INJECTOR Reconnect all harness connectors. Turn the ignition on. With the scan tool, erase all PCM DTCs. Disconnect the Fuel Injector 1 harness connector. With the scan tool, read the PCM DTCs. NOTE: The continued setting of multiple DTCs indicates that the disconnected injector is not the cause of these faults. NOTE: If multiple DTCs did not reset after disconnecting a single injector, replace the injector that was disconnected. In this case the lack of multiple DTCs setting indicates that the disconnected injector is the cause of these faults. Choose the correct result below. The PCM set Multiple Injector DTCs Reconnect the disconnected Injector harness connector and repeat test by disconnecting another injector until multiple DTCs are not set. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . The PCM set only a DTC for the disconnected Injector Replace the Fuel Injector that was disconnected in accordance with the service information. Refer to «INJECTOR(S), FUEL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .

P0265-FUEL INJECTOR 2 CIRCUIT HIGH

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article .

With the engine cranking or running.

The Powertrain Control Module (PCM) detects a fault on a Fuel Injector Control circuit.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

1. VERIFY ACTIVE DTC Turn the ignition on. With the scan tool, erase the PCM DTCs. Attempt to start the engine and test drive the vehicle. With the scan tool, read the PCM DTCs. Did this DTC return? Yes Go To 2 . No Perform the INTERMITTENT DTC diagnostic procedure. Refer to «INTERMITTENT DTC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
2. CHECKING FOR OTHER DTCS NOTE: An open ASD power supply to the PCM will cause multiple DTCs including this DTC to set. NOTE: Check the PCM for other DTCs. If other DTCs are set with this DTC refer to the symptom list and perform the CHECKING THE PCM POWER AND GROUND CIRCUITS test before continuing. Refer to «CHECKING THE PCM POWER AND GROUND CIRCUITS»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#driveability-diesel-non-dtc-based-diagnostics) . If the PCM power and ground circuits are functioning properly continue with this test. Yes Go To 3 .
3. CHECK THE FUEL INJECTOR CONTROL CIRCUITS FOR A SHORT TO VOLTAGE Turn the ignition off. Disconnect all of the Fuel Injector harness connectors. Disconnect the PCM C2 harness connector. Remove the ASD Relay from the TIPM. Connect a jumper wire between cavity 30 and cavity 87 of the ASD Relay connector. Turn the ignition on. Measure the voltage of each Fuel Injector High-Side Control circuit. Measure the voltage of each Fuel Injector Low-Side Control circuit. Is the voltage above 1.0 Volt for any of the measurements? Yes Repair the appropriate Fuel Injector Control circuit for a short to voltage. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Go To 4 .
4. CHECK THE FUEL INJECTOR CONTROL CIRCUITS FOR A SHORT TO GROUND Turn the ignition off. Remove the jumper wire and install the ASD Relay. Measure the resistance between ground and each Fuel Injector High-Side Control circuit. Measure the resistance between ground and each Fuel Injector Low-Side Control circuit. Is the resistance below 10k Ohms for any of the measurements? Yes Repair the Fuel Injector Control circuit for a short to ground. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Go To 5 .
5. FUEL INJECTOR CIRCUITS SHORTED TOGETHER Measure the resistance between each of the Fuel Injector High-Side Control circuits and the Fuel Injector Low-Side Control circuits. Is the resistance below 10k Ohms for any of the measurements? Yes Repair the Fuel Injector circuits that measured below 10k Ohms for a short together. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Go To 6 .
6. CHECK THE FUEL INJECTOR CONTROL CIRCUIT FOR AN OPEN/HIGH RESISTANCE Measure the resistance of each Fuel Injector High-Side and Low-Side Control circuits between its respective injector harness connector and the PCM C2 harness connector. Is the resistance below 5.0 Ohms for each measurement? Yes Go To 7 . No Repair the Fuel Injector Control circuit that measured above 5.0 Ohms for an open or high resistance. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
7. CHECK THE FUEL INJECTOR FOR AN INTERNAL SHORT TO GROUND Measure the resistance between ground and either terminal of each Fuel Injector. Is the resistance above 10k Ohms for each measurement? Yes Go To 8 . No Replace the Fuel Injector that did not measure above 10k Ohms to ground. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
8. CHECK FUEL INJECTOR RESISTANCE Measure the resistance of each Fuel Injector (measure across both terminals of the injector). NOTE: Be sure to zero the meter before taking the measurement. A good Fuel Injector has approximately 0.5 Ohm of resistance when measured through it. Is the resistance below 1.0 Ohm for all? Yes Go To 9 . No Replace the Fuel Injector that did not measure below 1.0 Ohm. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
9. MULTIPLE FUEL INJECTOR DTCS Were there multiple Fuel Injector DTCs set in the PCM? Yes Go To 10 . No Replace Fuel Injector 2 in accordance with the service information. Refer to «INJECTOR(S), FUEL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
10. FUEL INJECTOR Reconnect all harness connectors. Turn the ignition on. With the scan tool, erase all PCM DTCs. Disconnect the Fuel Injector 2 harness connector. With the scan tool, read the PCM DTCs. NOTE: The continuing setting of multiple DTCs indicates that the disconnected injector is not the cause of these faults. NOTE: If multiple DTCs did not reset after disconnecting a single injector, replace the injector that was disconnected. In this case the lack of multiple DTCs setting indicates that the disconnected injector is the cause of these faults. Choose the correct result below. The PCM set Multiple Injector DTCs Reconnect the disconnected Injector harness connector and repeat test by disconnecting another injector until multiple DTCs are not set. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . The PCM set only a DTC for the disconnected Injector Replace the Fuel Injector that was disconnected in accordance with the service information. Refer to «INJECTOR(S), FUEL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .

P0268-FUEL INJECTOR 3 CIRCUIT HIGH

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article .

With the engine cranking or running.

The Powertrain Control Module (PCM) detects a fault on a Fuel Injector Control circuit.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

1. VERIFY ACTIVE DTC Turn the ignition on. With the scan tool, erase the PCM DTCs. Attempt to start the engine and test drive the vehicle. With the scan tool, read the PCM DTCs. Did this DTC return? Yes Go To 2 . No Perform the INTERMITTENT DTC diagnostic procedure. Refer to «INTERMITTENT DTC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
2. CHECKING FOR OTHER DTCS NOTE: An open ASD power supply to the PCM will cause multiple DTCs including this DTC to set. NOTE: Check the PCM for other DTCs. If other DTCs are set with this DTC refer to the symptom list and perform the CHECKING THE PCM POWER AND GROUND CIRCUITS test before continuing. Refer to «CHECKING THE PCM POWER AND GROUND CIRCUITS»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#driveability-diesel-non-dtc-based-diagnostics) . If the PCM power and ground circuits are functioning properly continue with this test. Yes Go To 3 .
3. CHECK THE FUEL INJECTOR CONTROL CIRCUITS FOR A SHORT TO VOLTAGE Turn the ignition off. Disconnect all of the Fuel Injector harness connectors. Disconnect the PCM C2 harness connector. Remove the ASD Relay from the TIPM. Connect a jumper wire between cavity 30 and cavity 87 of the ASD Relay connector. Turn the ignition on. Measure the voltage of each Fuel Injector High-Side Control circuit. Measure the voltage of each Fuel Injector Low-Side Control circuit. Is the voltage above 1.0 Volt for any of the measurements? Yes Repair the appropriate Fuel Injector Control circuit for a short to voltage. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Go To 4 .
4. CHECK THE FUEL INJECTOR CONTROL CIRCUITS FOR A SHORT TO GROUND Turn the ignition off. Remove the jumper wire and install the ASD Relay. Measure the resistance between ground and each Fuel Injector High-Side Control circuit. Measure the resistance between ground and each Fuel Injector Low-Side Control circuit. Is the resistance below 10k Ohms for any of the measurements? Yes Repair the Fuel Injector Control circuit for a short to ground. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Go To 5 .
5. FUEL INJECTOR CIRCUITS SHORTED TOGETHER Measure the resistance between each of the Fuel Injector High-Side Control circuits and the Fuel Injector Low-Side Control circuits. Is the resistance below 10k Ohms for any of the measurements? Yes Repair the Fuel Injector circuits that measured below 10k Ohms for a short together. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Go To 6 .
6. CHECK THE FUEL INJECTOR CONTROL CIRCUIT FOR AN OPEN/HIGH RESISTANCE Measure the resistance of each Fuel Injector High-Side and Low-Side Control circuits between its respective injector harness connector and the PCM C2 harness connector. Is the resistance below 5.0 Ohms for each measurement? Yes Go To 7 . No Repair the Fuel Injector Control circuit that measured above 5.0 Ohms for an open or high resistance. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
7. CHECK THE FUEL INJECTOR FOR AN INTERNAL SHORT TO GROUND Measure the resistance between ground and either terminal of each Fuel Injector. Is the resistance above 10k Ohms for each measurement? Yes Go To 8 . No Replace the Fuel Injector that did not measure above 10k Ohms to ground. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
8. CHECK FUEL INJECTOR RESISTANCE Measure the resistance of each Fuel Injector (measure across both terminals of the injector). NOTE: Be sure to zero the meter before taking the measurement. A good Fuel Injector has approximately 0.5 Ohm of resistance when measured through it. Is the resistance below 1.0 Ohm for all? Yes Go To 9 . No Replace the Fuel Injector that did not measure below 1.0 Ohm. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
9. MULTIPLE FUEL INJECTOR DTCS Were there multiple Fuel Injector DTCs set in the PCM? Yes Go To 10 . No Replace Fuel Injector 3 in accordance with the service information. Refer to «INJECTOR(S), FUEL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
10. FUEL INJECTOR Reconnect all harness connectors. Turn the ignition on. With the scan tool, erase all PCM DTCs. Disconnect the Fuel Injector 3 harness connector. With the scan tool, read the PCM DTCs. NOTE: The continuing setting of multiple DTCs indicates that the disconnected injector is not the cause of these faults. NOTE: If multiple DTCs did not reset after disconnecting a single injector, replace the injector that was disconnected. In this case the lack of multiple DTCs setting indicates that the disconnected injector is the cause of these faults. Choose the correct result below. The PCM set Multiple Injector DTCs Reconnect the disconnected Injector harness connector and repeat test by disconnecting another injector until multiple DTCs are not set. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . The PCM set only a DTC for the disconnected Injector Replace the Fuel Injector that was disconnected in accordance with the service information. Refer to «INJECTOR(S), FUEL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .

P0271-FUEL INJECTOR 4 CIRCUIT HIGH

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article .

With the engine cranking or running.

The Powertrain Control Module (PCM) detects a fault on a Fuel Injector Control circuit.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

1. VERIFY ACTIVE DTC Turn the ignition on. With the scan tool, erase the PCM DTCs. Attempt to start the engine and test drive the vehicle. With the scan tool, read the PCM DTCs. Did this DTC return? Yes Go To 2 . No Perform the INTERMITTENT DTC diagnostic procedure. Refer to «INTERMITTENT DTC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
2. CHECKING FOR OTHER DTCS NOTE: An open ASD power supply to the PCM will cause multiple DTCs including this DTC to set. NOTE: Check the PCM for other DTCs. If other DTCs are set with this DTC refer to the symptom list and perform the CHECKING THE PCM POWER AND GROUND CIRCUITS test before continuing. Refer to «CHECKING THE PCM POWER AND GROUND CIRCUITS»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#driveability-diesel-non-dtc-based-diagnostics) . If the PCM power and ground circuits are functioning properly continue with this test. Yes Go To 3 .
3. CHECK THE FUEL INJECTOR CONTROL CIRCUITS FOR A SHORT TO VOLTAGE Turn the ignition off. Disconnect all of the Fuel Injector harness connectors. Disconnect the PCM C2 harness connector. Remove the ASD Relay from the TIPM. Connect a jumper wire between cavity 30 and cavity 87 of the ASD Relay connector. Turn the ignition on. Measure the voltage of each Fuel Injector High-Side Control circuit. Measure the voltage of each Fuel Injector Low-Side Control circuit. Is the voltage above 1.0 Volt for any of the measurements? Yes Repair the appropriate Fuel Injector Control circuit for a short to voltage. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Go To 4 .
4. CHECK THE FUEL INJECTOR CONTROL CIRCUITS FOR A SHORT TO GROUND Turn the ignition off. Remove the jumper wire and install the ASD Relay. Measure the resistance between ground and each Fuel Injector High-Side Control circuit. Measure the resistance between ground and each Fuel Injector Low-Side Control circuit. Is the resistance below 10k Ohms for any of the measurements? Yes Repair the Fuel Injector Control circuit for a short to ground. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Go To 5 .
5. FUEL INJECTOR CIRCUITS SHORTED TOGETHER Measure the resistance between each of the Fuel Injector High-Side Control circuits and the Fuel Injector Low-Side Control circuits. Is the resistance below 10k Ohms for any of the measurements? Yes Repair the Fuel Injector circuits that measured below 10k Ohms for a short together. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Go To 6 .
6. CHECK THE FUEL INJECTOR CONTROL CIRCUIT FOR AN OPEN/HIGH RESISTANCE Measure the resistance of each Fuel Injector High-Side and Low-Side Control circuits between its respective injector harness connector and the PCM C2 harness connector. Is the resistance below 5.0 Ohms for each measurement? Yes Go To 7 . No Repair the Fuel Injector Control circuit that measured above 5.0 Ohms for an open or high resistance. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
7. CHECK THE FUEL INJECTOR FOR AN INTERNAL SHORT TO GROUND Measure the resistance between ground and either terminal of each Fuel Injector. Is the resistance above 10k Ohms for each measurement? Yes Go To 8 . No Replace the Fuel Injector that did not measure above 10k Ohms to ground. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
8. CHECK FUEL INJECTOR RESISTANCE Measure the resistance of each Fuel Injector (measure across both terminals of the injector). NOTE: Be sure to zero the meter before taking the measurement. A good Fuel Injector has approximately 0.5 Ohm of resistance when measured through it. Is the resistance below 1.0 Ohm for all? Yes Go To 9 . No Replace the Fuel Injector that did not measure below 1.0 Ohm. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
9. MULTIPLE FUEL INJECTOR DTCS Were there multiple Fuel Injector DTCs set in the PCM? Yes Go To 10 . No Replace Fuel Injector 4 in accordance with the service information. Refer to «INJECTOR(S), FUEL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
10. FUEL INJECTOR Reconnect all harness connectors. Turn the ignition on. With the scan tool, erase all PCM DTCs. Disconnect the Fuel Injector 4 harness connector. With the scan tool, read the PCM DTCs. NOTE: The continuing setting of multiple DTCs indicates that the disconnected injector is not the cause of these faults. NOTE: If multiple DTCs did not reset after disconnecting a single injector, replace the injector that was disconnected. In this case the lack of multiple DTCs setting indicates that the disconnected injector is the cause of these faults. Choose the correct result below. The PCM set Multiple Injector DTCs Reconnect the disconnected Injector harness connector and repeat test by disconnecting another injector until multiple DTCs are not set. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . The PCM set only a DTC for the disconnected Injector Replace the Fuel Injector that was disconnected in accordance with the service information. Refer to «INJECTOR(S), FUEL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .

P0274-CYLINDER 5 INJECTOR CIRCUIT HIGH

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article .

With the engine cranking or running.

The Powertrain Control Module (PCM) detects a fault on a Fuel Injector Control circuit.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

1. VERIFY ACTIVE DTC Turn the ignition on. With the scan tool, erase the PCM DTCs. Attempt to start the engine and test drive the vehicle. With the scan tool, read the PCM DTCs. Did this DTC return? Yes Go To 2 . No Perform the INTERMITTENT DTC diagnostic procedure. Refer to «INTERMITTENT DTC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
2. CHECKING FOR OTHER DTCS NOTE: An open ASD power supply to the PCM will cause multiple DTCs including this DTC to set. NOTE: Check the PCM for other DTCs. If other DTCs are set with this DTC refer to the symptom list and perform the CHECKING THE PCM POWER AND GROUND CIRCUITS test before continuing. Refer to «CHECKING THE PCM POWER AND GROUND CIRCUITS»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#driveability-diesel-non-dtc-based-diagnostics) . If the PCM power and ground circuits are functioning properly continue with this test. Yes Go To 3 .
3. CHECK THE FUEL INJECTOR CONTROL CIRCUITS FOR A SHORT TO VOLTAGE Turn the ignition off. Disconnect all of the Fuel Injector harness connectors. Disconnect the PCM C2 harness connector. Remove the ASD Relay from the TIPM. Connect a jumper wire between cavity 30 and cavity 87 of the ASD Relay connector. Turn the ignition on. Measure the voltage of each Fuel Injector High-Side Control circuit. Measure the voltage of each Fuel Injector Low-Side Control circuit. Is the voltage above 1.0 Volt for any of the measurements? Yes Repair the appropriate Fuel Injector Control circuit for a short to voltage. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Go To 4 .
4. CHECK THE FUEL INJECTOR CONTROL CIRCUITS FOR A SHORT TO GROUND Turn the ignition off. Remove the jumper wire and install the ASD Relay. Measure the resistance between ground and each Fuel Injector High-Side Control circuit. Measure the resistance between ground and each Fuel Injector Low-Side Control circuit. Is the resistance below 10k Ohms for any of the measurements? Yes Repair the Fuel Injector Control circuit for a short to ground. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Go To 5 .
5. FUEL INJECTOR CIRCUITS SHORTED TOGETHER Measure the resistance between each of the Fuel Injector High-Side Control circuits and the Fuel Injector Low-Side Control circuits. Is the resistance below 10k Ohms for any of the measurements? Yes Repair the Fuel Injector circuits that measured below 10k Ohms for a short together. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Go To 6 .
6. CHECK THE FUEL INJECTOR CONTROL CIRCUIT FOR AN OPEN/HIGH RESISTANCE Measure the resistance of each Fuel Injector High-Side and Low-Side Control circuits between its respective injector harness connector and the PCM C2 harness connector. Is the resistance below 5.0 Ohms for each measurement? Yes Go To 7 . No Repair the Fuel Injector Control circuit that measured above 5.0 Ohms for an open or high resistance. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
7. CHECK THE FUEL INJECTOR FOR AN INTERNAL SHORT TO GROUND Measure the resistance between ground and either terminal of each Fuel Injector. Is the resistance above 10k Ohms for each measurement? Yes Go To 8 . No Replace the Fuel Injector that did not measure above 10k Ohms to ground. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
8. CHECK FUEL INJECTOR RESISTANCE Measure the resistance of each Fuel Injector (measure across both terminals of the injector). NOTE: Be sure to zero the meter before taking the measurement. A good Fuel Injector has approximately 0.5 Ohm of resistance when measured through it. Is the resistance below 1.0 Ohm for all? Yes Go To 9 . No Replace the Fuel Injector that did not measure below 1.0 Ohm. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
9. MULTIPLE FUEL INJECTOR DTCS Were there multiple Fuel Injector DTCs set in the PCM? Yes Go To 10 . No Replace Fuel Injector 5 in accordance with the service information. Refer to «INJECTOR(S), FUEL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
10. FUEL INJECTOR Reconnect all harness connectors. Turn the ignition on. With the scan tool, erase all PCM DTCs. Disconnect the Fuel Injector 5 harness connector. With the scan tool, read the PCM DTCs. NOTE: The continuing setting of multiple DTCs indicates that the disconnected injector is not the cause of these faults. NOTE: If multiple DTCs did not reset after disconnecting a single injector, replace the injector that was disconnected. In this case the lack of multiple DTCs setting indicates that the disconnected injector is the cause of these faults. Choose the correct result below. The PCM set Multiple Injector DTCs Reconnect the disconnected Injector harness connector and repeat test by disconnecting another injector until multiple DTCs are not set. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . The PCM set only a DTC for the disconnected Injector Replace the Fuel Injector that was disconnected in accordance with the service information. Refer to «INJECTOR(S), FUEL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .

P0277-CYLINDER 6 INJECTOR CIRCUIT HIGH

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article .

With the engine cranking or running.

The Powertrain Control Module (PCM) detects a fault on a Fuel Injector Control circuit.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

1. VERIFY ACTIVE DTC Turn the ignition on. With the scan tool, erase the PCM DTCs. Attempt to start the engine and test drive the vehicle. With the scan tool, read the PCM DTCs. Did this DTC return? Yes Go To 2 . No Perform the INTERMITTENT DTC diagnostic procedure. Refer to «INTERMITTENT DTC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
2. CHECKING FOR OTHER DTCS NOTE: An open ASD power supply to the PCM will cause multiple DTCs including this DTC to set. NOTE: Check the PCM for other DTCs. If other DTCs are set with this DTC refer to the symptom list and perform the CHECKING THE PCM POWER AND GROUND CIRCUITS test before continuing. Refer to «CHECKING THE PCM POWER AND GROUND CIRCUITS»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#driveability-diesel-non-dtc-based-diagnostics) . If the PCM power and ground circuits are functioning properly continue with this test. Yes Go To 3 .
3. CHECK THE FUEL INJECTOR CONTROL CIRCUITS FOR A SHORT TO VOLTAGE Turn the ignition off. Disconnect all of the Fuel Injector harness connectors. Disconnect the PCM C2 harness connector. Remove the ASD Relay from the TIPM. Connect a jumper wire between cavity 30 and cavity 87 of the ASD Relay connector. Turn the ignition on. Measure the voltage of each Fuel Injector High-Side Control circuit. Measure the voltage of each Fuel Injector Low-Side Control circuit. Is the voltage above 1.0 Volt for any of the measurements? Yes Repair the appropriate Fuel Injector Control circuit for a short to voltage. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Go To 4 .
4. CHECK THE FUEL INJECTOR CONTROL CIRCUITS FOR A SHORT TO GROUND Turn the ignition off. Remove the jumper wire and install the ASD Relay. Measure the resistance between ground and each Fuel Injector High-Side Control circuit. Measure the resistance between ground and each Fuel Injector Low-Side Control circuit. Is the resistance below 10k Ohms for any of the measurements? Yes Repair the Fuel Injector Control circuit for a short to ground. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Go To 5 .
5. FUEL INJECTOR CIRCUITS SHORTED TOGETHER Measure the resistance between each of the Fuel Injector High-Side Control circuits and the Fuel Injector Low-Side Control circuits. Is the resistance below 10k Ohms for any of the measurements? Yes Repair the Fuel Injector circuits that measured below 10k Ohms for a short together. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Go To 6 .
6. CHECK THE FUEL INJECTOR CONTROL CIRCUIT FOR AN OPEN/HIGH RESISTANCE Measure the resistance of each Fuel Injector High-Side and Low-Side Control circuits between its respective injector harness connector and the PCM C2 harness connector. Is the resistance below 5.0 Ohms for each measurement? Yes Go To 7 . No Repair the Fuel Injector Control circuit that measured above 5.0 Ohms for an open or high resistance. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
7. CHECK THE FUEL INJECTOR FOR AN INTERNAL SHORT TO GROUND Measure the resistance between ground and either terminal of each Fuel Injector. Is the resistance above 10k Ohms for each measurement? Yes Go To 8 . No Replace the Fuel Injector that did not measure above 10k Ohms to ground. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
8. CHECK FUEL INJECTOR RESISTANCE Measure the resistance of each Fuel Injector (measure across both terminals of the injector). NOTE: Be sure to zero the meter before taking the measurement. A good Fuel Injector has approximately 0.5 Ohm of resistance when measured through it. Is the resistance below 1.0 Ohm? Yes Go To 9 . No Replace the Fuel Injector that did not measure below 1.0 Ohm. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
9. MULTIPLE FUEL INJECTOR DTCS Were there multiple Fuel Injector DTCs set in the PCM? Yes Go To 10 . No Replace Fuel Injector 6 in accordance with the service information. Refer to «INJECTOR(S), FUEL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
10. FUEL INJECTOR Reconnect all harness connectors. Turn the ignition on. With the scan tool, erase all PCM DTCs. Disconnect the Fuel Injector 6 harness connector. With the scan tool, read the PCM DTCs. NOTE: The continuing setting of multiple DTCs indicates that the disconnected injector is not the cause of these faults. NOTE: If multiple DTCs did not reset after disconnecting a single injector, replace the injector that was disconnected. In this case the lack of multiple DTCs setting indicates that the disconnected injector is the cause of these faults. Choose the correct result below. The PCM set Multiple Injector DTCs Reconnect the disconnected Injector harness connector and repeat test by disconnecting another injector until multiple DTCs are not set. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . The PCM set only a DTC for the disconnected Injector Replace the Fuel Injector that was disconnected in accordance with the service information. Refer to «INJECTOR(S), FUEL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .

P0299-TURBOCHARGER UNDERBOOST CONDITION

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article .

With the engine running and the Powertrain Control Module (PCM) attempting to govern Turbocharger boost pressure.

The Boost Pressure Sensor indicates actual Turbocharger boost is less than the Powertrain Control Module (PCM) set point for engine boost for 0.83 second.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

1. CHECK FOR ACTIVE DTC Turn the ignition on. With the scan tool, erase DTCs in the Powertrain Control Module (PCM). Test drive the vehicle. With the scan tool, select View DTCs. NOTE: If there are any EGR related DTCs, repair the EGR DTCs before continuing with this test. Is the status Active for this DTC? Yes Go To 2 . No Perform the INTERMITTENT DTC diagnostic procedure. Refer to «INTERMITTENT DTC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
2. CHECK THE (F343) FUSED ASD RELAY OUTPUT CIRCUIT FOR AN OPEN/HIGH RESISTANCE CAUTION: Use only approved back probe tools when back probing a connector so as not to cause damage to the terminals or insulation of the connector. Damage to the terminals can cause poor terminal contact or retention. Damage to the insulation can introduce corrosion due to water infiltration. Using a voltmeter, back probe the (F343) Fused ASD Relay Output circuit at the Boost Pressure Actuator harness connector with one test lead. Back probe the (F343) Fused ASD Relay Output circuit at the Auxiliary PDC with the other test lead. Read the voltage on the meter. NOTE: The voltmeter should read zero volts if there is no resistance in the circuit. Does the voltmeter read below 0.2 volts? Yes Go To 3 . No Repair the (F343) Fused ASD Relay Output circuit for an open or high resistance. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
3. CHECK THE (Z903) BOOST PRESSURE ACTUATOR GROUND CIRCUIT FOR AN OPEN/HIGH RESISTANCE CAUTION: Use only approved back probe tools when back probing a connector so as not to cause damage to the terminals or insulation of the connector. Damage to the terminals can cause poor terminal contact or retention. Damage to the insulation can introduce corrosion due to water infiltration. Using a voltmeter, back probe the (Z903) Boost Pressure Actuator Ground circuit at the Boost Pressure Actuator harness connector with one test lead. Connect the other test lead to the negative jump start terminal. Read the voltage on the meter. NOTE: The voltmeter should read zero volts if there is no resistance in the circuit. Does the voltmeter read below 0.2 volts? Yes Go To 4 . No Repair the (Z903) Boost Pressure Actuator Ground circuit for an open or high resistance. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
4. CHECK THE (K137) BOOST PRESSURE ACTUATOR CONTROL CIRCUIT FOR AN OPEN/HIGH RESISTANCE Turn the ignition off. Disconnect the Boost Pressure Actuator harness connector. Disconnect the PCM harness connector. Check the resistance of the (K137) Boost Pressure Actuator Control circuit between the Boost Pressure Actuator harness connector and the PCM harness connector. Is the resistance below 5.0 Ohms? Yes Go To 5 . No Repair the (Z903) Boost Pressure Actuator Ground circuit for an open or high resistance. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
5. CHECK THE AIR FILTER Turn the ignition off. Remove and inspect the Air Filter for soiling or excessive dirt and debris which may cause air flow restriction. Were any of these problems found? Yes Replace the Air Filter element in accordance with the service information. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Go To 6 .
6. CHECK FOR INTAKE SYSTEM RESTRICTIONS NOTE: Damaged, restricted or poorly connected intake and Turbocharger related tubes can cause this DTC to set. Turn the ignition off. Inspect all air intake, crankcase vent and Turbocharger related hoses/tubes and connections for poor fitting or leaks. Inspect the Charge Air Cooler hoses/tubes and connections for poor fitting or leaks. Inspect the EGR Air Flow Control Valve to ensure the valve is not stuck in the closed position. Were any problems found? Yes Repair or replace as necessary. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Replace the Turbocharger assembly in accordance with the service information. Refer to «TURBOCHARGER, REMOVAL»(ref-466389-S05125519972012042500000) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .

P0335-CRANKSHAFT POSITION SENSOR CIRCUIT

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article .

The Crankshaft Position (CKP) Sensor is a hall effect type sensor. The sensor produces a 5 Volt digital signal (square wave). The PCM provides a 5-Volt supply, 5-Volt sensor signal and ground to the CKP Sensor. The sensor is positioned opposite a magnetic tone wheel at the rear of the crankshaft. The magnetic tone wheel contains internal magnetic strips (electric teeth) that act on the hall-effect switch causing the digital switching of the sensor signal from high (5 Volts) to low (0 Volts).

With the engine cranking or running.

The Powertrain Control Module (PCM) does not receive a signal from the Crankshaft Position Sensor (CKP) when the Camshaft Position Sensor (CMP) indicates engine RPM.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

Scheme 589

Scheme 590

Scheme 591

Scheme 592

Scheme 593

Scheme 594

Scheme 595

Scheme 596

Scheme 597

1. VERIFY ACTIVE DTC NOTE: The Timing Belt/Chain must be correctly installed and operational before diagnosis can be made. Refer to the service information to ensure the timing belt is properly installed. NOTE: If the PCM detects and stores a DTC, the PCM also stores the engine/vehicle operating conditions under which the DTC was set. Some of these conditions are displayed on the scan tool at the same time the DTC is displayed. Before erasing stored DTCs, record these conditions. Attempting to duplicate these conditions may assist when checking for an active DTC. Turn the ignition on. With the scan tool, erase the PCM DTCs. Attempt to start the engine, cranking the engine for at least seven (7) seconds. With the scan tool, read the PCM DTCs. NOTE: If any Sensor Reference DTCs are present, perform the applicable diagnostic procedure before continuing with this test. Does the scan tool display this DTC? Yes Go To 3 . No Go To 2 .
2. TEST DRIVE Turn the ignition on. With the scan tool, erase the PCM DTCs. Test drive the vehicle. With the scan tool, read the PCM DTCs. Does the scan tool display this DTC? Yes Go To 3 . No Perform the INTERMITTENT DTC diagnostic procedure. Refer to «INTERMITTENT DTC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
3. CHECK THE (K24) CRANKSHAFT POSITION SENSOR SIGNAL CIRCUIT Turn the ignition off. Disconnect the Crankshaft Position Sensor harness connector. Turn the ignition on. Measure the voltage of the (K24) CKP Sensor Signal circuit at the CKP Sensor harness connector. Select the appropriate voltage reading. Voltage is above 5.2 volts Go To 4 . Voltage is between 4.8 and 5.2 volts Go To 5 . Voltage is below 4.8 volts Go To 11 .
4. CHECK THE (K24) CRANKSHAFT POSITION SENSOR SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE Turn the ignition off. Disconnect the PCM C2 harness connector. Remove the ASD Relay. Connect a jumper wire between cavity 30 and cavity 87 of the ASD Relay connector. Turn the ignition on. Measure the voltage of the (K24) CKP Sensor Signal circuit at the CKP Sensor harness connector. Is there any voltage present? Yes Repair the (K24) Crankshaft Position Sensor Signal circuit for a short to voltage. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Replace and program the Powertrain Control Module in accordance with the service information. Refer to «MODULE, POWERTRAIN CONTROL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/communication-devices/#electronic-control-modules-service-information) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
5. CHECK THE (K853) CRANKSHAFT POSITION SENSOR 5-VOLT SUPPLY CIRCUIT Measure the voltage of the (K853) CKP Sensor 5-Volt Supply circuit at the CKP Sensor harness connector. Select the appropriate voltage reading. Voltage is above 5.2 volts Repair the (K853) CKP 5-Volt Supply circuit for a short to voltage. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . Voltage is between 4.8 and 5.2 volts Go To 6 . Voltage is below 4.8 volts Go To 8 .
6. CHECK THE (K925) CRANKSHAFT POSITION SENSOR GROUND CIRCUIT FOR AN OPEN/HIGH RESISTANCE Turn the ignition off. Disconnect the PCM C2 harness connector. Measure the resistance of the (K925) CKP Sensor Ground circuit between the CKP Sensor harness connector and the PCM C2 harness connector. Is the resistance below 5.0 Ohms? Yes Go To 7 . No Repair the (K925) CKP Sensor Ground circuit for an open or high resistance. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
7. DAMAGED CRANKSHAFT POSITION SENSOR OR CRANKSHAFT Turn the ignition off. Remove the CKP Sensor. Inspect the CKP Sensor for conditions such as loose mounting screws, damage, or cracks. Inspect the Crankshaft magnetic tone wheel for conditions such as damage, or debris. Is there any evidence of these conditions? Yes Replace and program the Powertrain Control Module in accordance with the service information. Refer to «MODULE, POWERTRAIN CONTROL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/communication-devices/#electronic-control-modules-service-information) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Replace the Crankshaft Position Sensor in accordance with the service information. Refer to «MODULE, POWERTRAIN CONTROL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/communication-devices/#electronic-control-modules-service-information) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
8. CHECK THE (K853) CRANKSHAFT POSITION SENSOR 5-VOLT SUPPLY CIRCUIT FOR AN OPEN/HIGH RESISTANCE Turn the ignition off. Disconnect the PCM C2 harness connector. Measure the resistance of the (K853) CKP Sensor 5-Volt Supply circuit between the PCM C2 harness connector and the CKP Sensor harness connector. Is the resistance below 5.0 Ohms? Yes Go To 9 . No Repair the (K853) CKP Sensor 5-Volt Supply circuit for an open or high resistance. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
9. CHECK THE (K853) CRANKSHAFT POSITION SENSOR 5-VOLT SUPPLY CIRCUIT FOR A SHORT TO GROUND Measure the resistance between ground and the (K853) CKP Sensor 5-Volt Supply circuit at the CKP Sensor harness connector. Is the resistance above 10k Ohms? Yes Go To 10 . No Repair the (K853) CKP Sensor 5-Volt Supply circuit for a short to ground. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
10. CHECK FOR THE (K853) CRANKSHAFT POSITION SENSOR 5-VOLT SUPPLY CIRCUIT SHORTED TO THE (K925) CKP SENSOR GROUND CIRCUIT Measure the resistance between the (K853) CKP Sensor 5-Volt Supply circuit and the (K925) CKP Sensor Ground circuit at the CKP Sensor harness connector. Is the resistance above 10k Ohms? Yes Replace and program the Powertrain Control Module in accordance with the service information. Refer to «MODULE, POWERTRAIN CONTROL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/communication-devices/#electronic-control-modules-service-information) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Repair the (K853) CKP Sensor 5-Volt Supply circuit for a short to the (K925) CKP Sensor Ground circuit. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
11. CHECK THE (K24) CRANKSHAFT POSITION SENSOR SIGNAL CIRCUIT FOR AN OPEN/HIGH RESISTANCE Disconnect the PCM C2 harness connector. Measure the resistance of the (K24) CKP Sensor Signal circuit between the PCM C2 harness connector and the CKP Sensor harness connector. Is the resistance below 5.0 Ohms? Yes Go To 12 . No Repair the (K24) CKP Sensor Signal circuit for an open or high resistance. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
12. CHECK THE (K24) CRANKSHAFT POSITION SENSOR SIGNAL CIRCUIT FOR A SHORT TO GROUND Measure the resistance between ground and the (K24) CKP Sensor Signal circuit at the CKP Sensor harness connector. Is the resistance above 10k Ohms? Yes Go To 13 . No Repair the (K24) CKP Sensor Signal circuit for a short to ground. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
13. CHECK FOR THE (K24) CRANKSHAFT POSITION SENSOR SIGNAL CIRCUIT SHORTED TO THE (K925) CKP SENSOR GROUND CIRCUIT Measure the resistance between the (K24) CKP Sensor Signal circuit and the (K925) CKP Sensor Ground circuit at the CKP Sensor harness connector. Is the resistance above 10k Ohms? Yes Replace and program the Powertrain Control Module in accordance with the service information. Refer to «MODULE, POWERTRAIN CONTROL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/communication-devices/#electronic-control-modules-service-information) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Repair the (K24) CKP Sensor Signal circuit for a short to the (K925) CKP Sensor Ground circuit. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .

P0336-CRANKSHAFT POSITION SENSOR PERFORMANCE

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article .

The Crankshaft Position (CKP) Sensor is a hall effect type sensor. The sensor produces a 5 Volt digital signal (square wave). The PCM provides a 5-Volt supply, 5-Volt sensor signal and ground to the CKP Sensor. The sensor is positioned opposite a magnetic tone wheel at the rear of the crankshaft. The magnetic tone wheel contains internal magnetic strips (electric teeth) that act on the hall-effect switch causing the digital switching of the sensor signal from high (5 Volts) to low (0 Volts).

With the engine cranking or running.

The Powertrain Control Module (PCM) does not receive a signal from the Crankshaft Position Sensor (CKP) when the Camshaft Position Sensor (CMP) indicates engine RPM.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

1. VERIFY ACTIVE DTC NOTE: The Timing Belt/Chain must be correctly installed and operational before diagnosis can be made. Refer to the service information to ensure the timing belt is properly installed. NOTE: If the PCM detects and stores a DTC, the PCM also stores the engine/vehicle operating conditions under which the DTC was set. Some of these conditions are displayed on the scan tool at the same time the DTC is displayed. Before erasing stored DTCs, record these conditions. Attempting to duplicate these conditions may assist when checking for an active DTC. Turn the ignition on. With the scan tool, erase the PCM DTCs. Attempt to start the engine, cranking the engine for at least seven (7) seconds. With the scan tool, read the PCM DTCs. NOTE: If any Sensor Reference DTCs are present, perform the applicable diagnostic procedure before continuing with this test. Does the scan tool display this DTC? Yes Go To 3 . No Go To 2 .
2. TEST DRIVE Turn the ignition on. With the scan tool, erase the PCM DTCs. Test drive the vehicle. With the scan tool, read the PCM DTCs. Does the scan tool display this DTC? Yes Go To 3 . No Perform the INTERMITTENT DTC diagnostic procedure. Refer to «INTERMITTENT DTC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
3. CHECK THE (K24) CRANKSHAFT POSITION SENSOR SIGNAL CIRCUIT Turn the ignition off. Disconnect the Crankshaft Position Sensor harness connector. Turn the ignition on. Measure the voltage of the (K24) CKP Sensor Signal circuit at the CKP Sensor harness connector. Select the appropriate voltage reading. Voltage is above 5.2 volts Go To 4 . Voltage is between 4.8 and 5.2 volts Go To 5 . Voltage is below 4.8 volts Go To 11 .
4. CHECK THE (K24) CRANKSHAFT POSITION SENSOR SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE Turn the ignition off. Disconnect the PCM C2 harness connector. Remove the ASD Relay. Connect a jumper wire between cavity 30 and cavity 87 of the ASD Relay connector. Turn the ignition on. Measure the voltage of the (K24) CKP Sensor Signal circuit at the CKP Sensor harness connector. Is there any voltage present? Yes Repair the (K24) Crankshaft Position Sensor Signal circuit for a short to voltage. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Replace and program the Powertrain Control Module in accordance with the service information. Refer to «MODULE, POWERTRAIN CONTROL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/communication-devices/#electronic-control-modules-service-information) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
5. CHECK THE (K853) CRANKSHAFT POSITION SENSOR 5-VOLT SUPPLY CIRCUIT Measure the voltage of the (K853) CKP Sensor 5-Volt Supply circuit at the CKP Sensor harness connector. Select the appropriate voltage reading. Voltage is above 5.2 volts Repair the (K853) CKP 5-Volt Supply circuit for a short to voltage. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . Voltage is between 4.8 and 5.2 volts Go To 6 . Voltage is below 4.8 volts Go To 8 .
6. CHECK THE (K925) CRANKSHAFT POSITION SENSOR GROUND CIRCUIT FOR AN OPEN/HIGH RESISTANCE Turn the ignition off. Disconnect the PCM C2 harness connector. Measure the resistance of the (K925) CKP Sensor Ground circuit between the CKP Sensor harness connector and the PCM C2 harness connector. Is the resistance below 5.0 Ohms? Yes Go To 7 . No Repair the (K925) CKP Sensor Ground circuit for an open or high resistance. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
7. DAMAGED CRANKSHAFT POSITION SENSOR OR CRANKSHAFT Turn the ignition off. Remove the CKP Sensor. Inspect the CKP Sensor for conditions such as loose mounting screws, damage, or cracks. Inspect the Crankshaft magnetic tone wheel for conditions such as damage, or debris. Is there any evidence of these conditions? Yes Replace and program the Powertrain Control Module in accordance with the service information. Refer to «MODULE, POWERTRAIN CONTROL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/communication-devices/#electronic-control-modules-service-information) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Replace the Crankshaft Position Sensor in accordance with the service information. Refer to «MODULE, POWERTRAIN CONTROL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/communication-devices/#electronic-control-modules-service-information) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
8. CHECK THE (K853) CRANKSHAFT POSITION SENSOR 5-VOLT SUPPLY CIRCUIT FOR AN OPEN/HIGH RESISTANCE Turn the ignition off. Disconnect the PCM C2 harness connector. Measure the resistance of the (K853) CKP Sensor 5-Volt Supply circuit between the PCM C2 harness connector and the CKP Sensor harness connector. Is the resistance below 5.0 Ohms? Yes Go To 9 . No Repair the (K853) CKP Sensor 5-Volt Supply circuit for an open or high resistance. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
9. CHECK THE (K853) CRANKSHAFT POSITION SENSOR 5-VOLT SUPPLY CIRCUIT FOR A SHORT TO GROUND Measure the resistance between ground and the (K853) CKP Sensor 5-Volt Supply circuit at the CKP Sensor harness connector. Is the resistance above 10k Ohms? Yes Go To 10 . No Repair the (K853) CKP Sensor 5-Volt Supply circuit for a short to ground. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
10. CHECK FOR THE (K853) CRANKSHAFT POSITION SENSOR 5-VOLT SUPPLY CIRCUIT SHORTED TO THE (K925) CKP SENSOR GROUND CIRCUIT Measure the resistance between the (K853) CKP Sensor 5-Volt Supply circuit and the (K925) CKP Sensor Ground circuit at the CKP Sensor harness connector. Is the resistance above 10k Ohms? Yes Replace and program the Powertrain Control Module in accordance with the service information. Refer to «MODULE, POWERTRAIN CONTROL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/communication-devices/#electronic-control-modules-service-information) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Repair the (K853) CKP Sensor 5-Volt Supply circuit for a short to the (K925) CKP Sensor Ground circuit. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
11. CHECK THE (K24) CRANKSHAFT POSITION SENSOR SIGNAL CIRCUIT FOR AN OPEN/HIGH RESISTANCE Disconnect the PCM C2 harness connector. Measure the resistance of the (K24) CKP Sensor Signal circuit between the PCM C2 harness connector and the CKP Sensor harness connector. Is the resistance below 5.0 Ohms? Yes Go To 12 . No Repair the (K24) CKP Sensor Signal circuit for an open or high resistance. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
12. CHECK THE (K24) CRANKSHAFT POSITION SENSOR SIGNAL CIRCUIT FOR A SHORT TO GROUND Measure the resistance between ground and the (K24) CKP Sensor Signal circuit at the CKP Sensor harness connector. Is the resistance above 10k Ohms? Yes Go To 13 . No Repair the (K24) CKP Sensor Signal circuit for a short to ground. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
13. CHECK FOR THE (K24) CRANKSHAFT POSITION SENSOR SIGNAL CIRCUIT SHORTED TO THE (K925) CKP SENSOR GROUND CIRCUIT Measure the resistance between the (K24) CKP Sensor Signal circuit and the (K925) CKP Sensor Ground circuit at the CKP Sensor harness connector. Is the resistance above 10k Ohms? Yes Replace and program the Powertrain Control Module in accordance with the service information. Refer to «MODULE, POWERTRAIN CONTROL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/communication-devices/#electronic-control-modules-service-information) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Repair the (K24) CKP Sensor Signal circuit for a short to the (K925) CKP Sensor Ground circuit. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .

P0340-CAMSHAFT POSITION SENSOR CIRCUIT

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article .

The Camshaft Position (CMP) Sensor is a hall effect type sensor. The sensor produces a 5 Volt digital signal (square wave). The PCM provides a 5 Volt supply, 5 Volt sensor signal and ground to the CMP Sensor. The sensor is positioned near the right front of the Timing Cover. As the camshaft rotates, the eccentric passes closely to the CMP sensor triggering the hall-effect switch causing the digital switching of the sensor signal from high (5 Volts) to low (0 Volts).

With the engine cranking or running.

The Powertrain Control Module (PCM) receive a disturbed signal from the Camshaft Position Sensor when the Crankshaft Position Sensor indicates engine RPM.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

Scheme 598

Scheme 599

Scheme 600

Scheme 601

Scheme 602

Scheme 603

Scheme 604

Scheme 605

Scheme 606

1. VERIFY ACTIVE DTC NOTE: The Timing Belt/Chain must be correctly installed and operational before diagnosis can be made. Refer to the Service Information to ensure the timing belt is properly installed. NOTE: If the PCM detects and stores a DTC, the PCM also stores the engine/vehicle operating conditions under which the DTC was set. Some of these conditions are displayed on the scan tool at the same time the DTC is displayed. Before erasing stored DTCs, record these conditions. Attempting to duplicate these conditions may assist when checking for an active DTC. Turn the ignition on. With the scan tool, erase the PCM DTCs. Attempt to start the engine cranking the engine for at least 10 seconds. With the scan tool, read the PCM DTCs. NOTE: If any Sensor Reference o DTCs are present, perform the applicable diagnostic procedure before continuing with this test. Does the scan tool display this DTC? Yes Go To 3 . No Go To 2 .
2. TEST DRIVE Turn the ignition on. With the scan tool, erase the PCM DTCs. Test drive the vehicle. With the scan tool, read the PCM DTCs. Does the scan tool display this DTC? Yes Go To 3 . No Perform the INTERMITTENT DTC diagnostic procedure. Refer to «INTERMITTENT DTC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
3. CHECK THE (K44) CAMSHAFT POSITION SENSOR SIGNAL CIRCUIT Turn the ignition off. Disconnect the Camshaft Position Sensor harness connector. Turn the ignition on. Measure the voltage of the (K44) CMP Sensor Signal circuit at the CMP Sensor harness connector. Select the appropriate voltage reading. Voltage is above 5.2 volts Go To 4 . Voltage is between 4.8 and 5.2 volts Go To 5 . Voltage is below 4.8 volts Go To 11 .
4. CHECK THE (K44) CAMSHAFT POSITION SENSOR SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE Turn the ignition off. Disconnect the PCM C2 harness connector. Remove the ASD Relay. Connect a jumper wire between cavity 30 and cavity 87 of the ASD Relay connector. Turn the ignition on. Measure the voltage of the (K44) CMP Position Sensor Signal circuit at the CMP Sensor harness connector. Is the voltage below 1.0 volt? Yes Replace and program the Powertrain Control Module in accordance the service information. Refer to «MODULE, POWERTRAIN CONTROL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/communication-devices/#electronic-control-modules-service-information) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Repair the (K44) Camshaft Position Sensor Signal circuit for a short to voltage. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
5. CHECK THE (K844) CAMSHAFT POSITION SENSOR 5-VOLT SUPPLY CIRCUIT Measure the voltage of the (K844) CMP Sensor 5-Volt Supply circuit at the CMP Sensor harness connector. Select the appropriate voltage reading. Voltage is above 5.2 volts Repair the (K844) CMP 5-Volt Supply circuit for a short to voltage. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . Voltage is between 4.8 and 5.2 volts Go To 6 . Voltage is below 4.8 volts Go To 8 .
6. CHECK THE (K944) CAMSHAFT POSITION SENSOR GROUND CIRCUIT FOR AN OPEN/HIGH RESISTANCE Turn the ignition off. Disconnect the PCM C2 harness connector. Measure the resistance of the (K944) CMP Sensor Ground circuit between the CMP Sensor harness connector and the PCM C2 harness connector. Is the resistance below 5.0 Ohms? Yes Go To 7 . No Repair the (K944) CMP Sensor Ground circuit for an open or high resistance. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
7. DAMAGED CAMSHAFT POSITION SENSOR OR CAMSHAFT Turn the ignition off. Remove the CMP Sensor. Inspect the CMP Sensor for conditions such as loose mounting screws, damage, or cracks. Inspect the Camshaft Tone Wheel for conditions such as damage, debris or cracked teeth. Is there any evidence of these conditions? Yes Replace the damaged Camshaft Position Sensor or Camshaft Tone Wheel in accordance with the service information. Refer to «SENSOR, CAMSHAFT POSITION, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Replace and program the Powertrain Control Module in accordance the service information. Refer to «MODULE, POWERTRAIN CONTROL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/communication-devices/#electronic-control-modules-service-information) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
8. CHECK THE (K844) CAMSHAFT POSITION SENSOR 5-VOLT SUPPLY CIRCUIT FOR AN OPEN/HIGH RESISTANCE Turn the ignition off. Disconnect the PCM C1 harness connector. Measure the resistance of the (K844) CMP 5-Volt Supply circuit between the PCM C2 harness connector and the CMP Sensor harness connector. Is the resistance below 5.0 Ohms? Yes Go To 9 . No Repair the (K844) CMP 5-Volt Supply circuit for an open or high resistance. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
9. CHECK THE (K844) CAMSHAFT POSITION SENSOR 5-VOLT SUPPLY CIRCUIT FOR A SHORT TO GROUND Measure the resistance between ground and the (K844) CMP Sensor 5-Volt Supply circuit at the CMP Sensor harness connector. Is the resistance above 10k Ohms? Yes Go To 10 . No Repair the (K844) CMP Sensor 5-Volt Supply circuit for a short to ground. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
10. CHECK FOR THE (K844) CAMSHAFT POSITION SENSOR 5-VOLT SUPPLY CIRCUIT SHORTED TO THE (K944) CMP SENSOR GROUND CIRCUIT Measure the resistance between the (K844) CMP Sensor 5-Volt Supply circuit and the (K944) CMP Sensor Ground circuit at the CMP Sensor harness connector. Is the resistance above 10k Ohms? Yes Replace and program the Powertrain Control Module in accordance with the service information. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Repair the (K844) CMP Sensor 5-Volt Supply circuit for a short to the (K944) CMP Sensor Ground circuit. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
11. CHECK THE (K44) CAMSHAFT POSITION SENSOR SIGNAL CIRCUIT FOR AN OPEN/HIGH RESISTANCE Turn the ignition off. Disconnect the PCM C2 harness connector. Measure the resistance of the (K44) CMP Sensor Signal circuit between the PCM C2 harness connector and the CMP Sensor harness connector. Is the resistance below 5.0 Ohms? Yes Go To 12 . No Repair the (K44) CMP Sensor Signal circuit for an open or high resistance. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
12. CHECK THE (K44) CAMSHAFT POSITION SENSOR SIGNAL CIRCUIT FOR A SHORT TO GROUND Measure the resistance between ground and the (K44) CMP Sensor Signal circuit at the CMP Sensor harness connector. Is the resistance above 10k Ohms? Yes Go To 13 . No Repair the (K44) CMP Sensor Signal circuit for a short to ground. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
13. CHECK FOR THE (K44) CAMSHAFT POSITION SENSOR SIGNAL CIRCUIT SHORTED TO THE (K944) CAMSHAFT POSITION SENSOR GROUND CIRCUIT Measure the resistance between the (K44) CMP Sensor Signal circuit and the (K944) CMP Sensor Ground circuit at the CMP Sensor harness connector. Is the resistance above 10k Ohms? Yes Replace and program the Powertrain Control Module in accordance the service information. Refer to «MODULE, POWERTRAIN CONTROL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/communication-devices/#electronic-control-modules-service-information) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Repair the (K44) CMP Sensor Signal circuit for a short to the (K944) CMP Sensor Ground circuit. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .

P0341-CAMSHAFT POSITION SENSOR - PERFORMANCE BANK 1 - SENSOR 1

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article .

The Camshaft Position (CMP) Sensor is a hall effect type sensor. The sensor produces a 5 volt digital signal (square wave). The PCM provides a 5 volt supply, 5 volt sensor signal and ground to the CMP Sensor. The sensor is positioned on the right front of the Timing Cover. As the camshaft rotates, the eccentric passes closely to the CMP sensor triggering the hall-effect switch causing the digital switching of the sensor signal from high (5 volts) to low (0 volts).

With the engine cranking or running.

The Powertrain Control Module (PCM) does not receive a signal from the Camshaft Position Sensor when the Crankshaft Position Sensor indicates engine RPM.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

1. VERIFY ACTIVE DTC NOTE: The Timing Belt/Chain must be correctly installed and operational before diagnosis can be made. Refer to the Service Information to ensure the timing belt is properly installed. NOTE: If the PCM detects and stores a DTC, the PCM also stores the engine/vehicle operating conditions under which the DTC was set. Some of these conditions are displayed on the scan tool at the same time the DTC is displayed. Before erasing stored DTCs, record these conditions. Attempting to duplicate these conditions may assist when checking for an active DTC. Turn the ignition on. With the scan tool, erase the PCM DTCs. Attempt to start the engine cranking the engine for at least 10 seconds. With the scan tool, read the PCM DTCs. NOTE: If any Sensor Reference DTCs are present, perform the applicable diagnostic procedure before continuing with this test. Does the scan tool display this DTC? Yes Go To 3 . No Go To 2 .
2. TEST DRIVE Turn the ignition on. With the scan tool, erase the PCM DTCs. Test drive the vehicle. With the scan tool, read the PCM DTCs. Does the scan tool display this DTC? Yes Go To 3 . No Perform the INTERMITTENT DTC diagnostic procedure. Refer to «INTERMITTENT DTC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
3. CHECK THE (K44) CAMSHAFT POSITION SENSOR SIGNAL CIRCUIT Turn the ignition off. Disconnect the Camshaft Position Sensor harness connector. Turn the ignition on. Measure the voltage of the (K44) CMP Sensor Signal circuit at the CMP Sensor harness connector. Select the appropriate voltage reading. Voltage is above 5.2 volts Go To 4 . Voltage is between 4.8 and 5.2 volts Go To 5 . Voltage is below 4.8 volts Go To 11 .
4. CHECK THE (K44) CAMSHAFT POSITION SENSOR SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE Turn the ignition off. Disconnect the PCM C2 harness connector. Remove the ASD Relay. Connect a jumper wire between cavity 30 and cavity 87 of the ASD Relay connector. Turn the ignition on. Measure the voltage of the (K44) CMP Position Sensor Signal circuit at the CMP Sensor harness connector. Is the voltage below 1.0 volt? Yes Replace and program the Powertrain Control Module in accordance the service information. Refer to «MODULE, POWERTRAIN CONTROL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/communication-devices/#electronic-control-modules-service-information) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Repair the (K44) Camshaft Position Sensor Signal circuit for a short to voltage. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
5. CHECK THE (K844) CAMSHAFT POSITION SENSOR 5-VOLT SUPPLY CIRCUIT Measure the voltage of the (K844) CMP Sensor 5-Volt Supply circuit at the CMP Sensor harness connector. Select the appropriate voltage reading. Voltage is above 5.2 volts Repair the (K844) CMP 5-Volt Supply circuit for a short to voltage. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . Voltage is between 4.8 and 5.2 volts Go To 6 . Voltage is below 4.8 volts Go To 8 .
6. CHECK THE (K944) CAMSHAFT POSITION SENSOR GROUND CIRCUIT FOR AN OPEN/HIGH RESISTANCE Turn the ignition off. Disconnect the PCM C2 harness connector. Measure the resistance of the (K944) CMP Sensor Ground circuit between the CMP Sensor harness connector and the PCM C2 harness connector. Is the resistance below 5.0 Ohms? Yes Go To 7 . No Repair the (K944) CMP Sensor Ground circuit for an open or high resistance. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
7. DAMAGED CAMSHAFT POSITION SENSOR OR CAMSHAFT Turn the ignition off. Remove the CMP Sensor. Inspect the CMP Sensor for conditions such as loose mounting screws, damage, or cracks. Inspect the Camshaft Tone Wheel for conditions such as damage, debris or cracked teeth. Is there any evidence of these conditions? Yes Replace the damaged Camshaft Position Sensor or Camshaft Tone Wheel in accordance with the service information. Refer to «SENSOR, CAMSHAFT POSITION, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Replace and program the Powertrain Control Module in accordance the service information. Refer to «MODULE, POWERTRAIN CONTROL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/communication-devices/#electronic-control-modules-service-information) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
8. CHECK THE (K844) CAMSHAFT POSITION SENSOR 5-VOLT SUPPLY CIRCUIT FOR AN OPEN/HIGH RESISTANCE Turn the ignition off. Disconnect the PCM C1 harness connector. Measure the resistance of the (K844) CMP 5-Volt Supply circuit between the PCM C2 harness connector and the CMP Sensor harness connector. Is the resistance below 5.0 Ohms? Yes Go To 9 . No Repair the (K844) CMP 5-Volt Supply circuit for an open or high resistance. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
9. CHECK THE (K844) CAMSHAFT POSITION SENSOR 5-VOLT SUPPLY CIRCUIT FOR A SHORT TO GROUND Measure the resistance between ground and the (K844) CMP Sensor 5-Volt Supply circuit at the CMP Sensor harness connector. Is the resistance above 10k Ohms? Yes Go To 10 . No Repair the (K844) CMP Sensor 5-Volt Supply circuit for a short to ground. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
10. CHECK FOR THE (K844) CAMSHAFT POSITION SENSOR 5-VOLT SUPPLY CIRCUIT SHORTED TO THE (K944) CMP SENSOR GROUND CIRCUIT Measure the resistance between the (K844) CMP Sensor 5-Volt Supply circuit and the (K944) CMP Sensor Ground circuit at the CMP Sensor harness connector. Is the resistance above 10k Ohms? Yes Replace and program the Powertrain Control Module in accordance with the service information. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Repair the (K844) CMP Sensor 5-Volt Supply circuit for a short to the (K944) CMP Sensor Ground circuit. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
11. CHECK THE (K44) CAMSHAFT POSITION SENSOR SIGNAL CIRCUIT FOR AN OPEN/HIGH RESISTANCE Turn the ignition off. Disconnect the PCM C2 harness connector. Measure the resistance of the (K44) CMP Sensor Signal circuit between the PCM C2 harness connector and the CMP Sensor harness connector. Is the resistance below 5.0 Ohms? Yes Go To 12 . No Repair the (K44) CMP Sensor Signal circuit for an open or high resistance. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
12. CHECK THE (K44) CAMSHAFT POSITION SENSOR SIGNAL CIRCUIT FOR A SHORT TO GROUND Measure the resistance between ground and the (K44) CMP Sensor Signal circuit at the CMP Sensor harness connector. Is the resistance above 10k Ohms? Yes Go To 13 . No Repair the (K44) CMP Sensor Signal circuit for a short to ground. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
13. CHECK FOR THE (K44) CAMSHAFT POSITION SENSOR SIGNAL CIRCUIT SHORTED TO THE (K944) CAMSHAFT POSITION SENSOR GROUND CIRCUIT Measure the resistance between the (K44) CMP Sensor Signal circuit and the (K944) CMP Sensor Ground circuit at the CMP Sensor harness connector. Is the resistance above 10k Ohms? Yes Replace and program the Powertrain Control Module in accordance the service information. Refer to «MODULE, POWERTRAIN CONTROL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/communication-devices/#electronic-control-modules-service-information) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Repair the (K44) CMP Sensor Signal circuit for a short to the (K944) CMP Sensor Ground circuit. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .

Scheme 607

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article .

The Glow Plug Module is located next to the Fuel Filter. The Glow Plug Module receives a signal and ground from the Powertrain Control Module (PCM). The Glow Plug Module supplies power to the Glow Plugs and a ground path is provided through the body of the Glow Plugs. The Glow Plug Module communicates with the PCM over the (K330) Glow Plug Module Diagnostic circuit.

With the ignition on.

The Powertrain Control Module (PCM) detects an open or short to ground on the (K202) Glow Plug Module Control circuit for 0.5 second.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

Scheme 608

Scheme 609

1. DTC IS ACTIVE Ignition on, engine not running. With the scan tool, erase DTCs in the Powertrain Control Module (PCM). With the scan tool, actuate the Glow Plugs. Monitor the scan tool for at least two minutes. Cycle the ignition key off and on several times, leaving the ignition on for at least 10 seconds at a time. Start the engine. Allow the engine to reach normal operating temperature. Test drive the vehicle. With the scan tool, select View DTCs. Is the status Active for this DTC? Yes Go To 2 . No Perform the INTERMITTENT DTC diagnostic procedure. Refer to «INTERMITTENT DTC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
2. CHECK THE (K202) GLOW PLUG MODULE CONTROL CIRCUIT FOR A SHORT TO GROUND Turn the ignition off. Disconnect the Glow Plug Module C1 harness connector. Disconnect the PCM C1 harness connectors. Measure the resistance between ground and the (K202) Glow Plug Module Control circuit in the Glow Plug Module C1 harness connector. Is the resistance below 10k ohms? Yes Repair the (K202) Glow Plug Module Control circuit for a short to ground. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Go To 3 .
3. CHECK THE (K202) GLOW PLUG MODULE CONTROL CIRCUIT FOR AN OPEN/HIGH RESISTANCE Measure the resistance of the (K202) Glow Plug Module Control circuit between the Glow Plug Module C1 harness connector and the PCM C1 harness connector. Is the resistance below 5.0 ohms? Yes Go To 4 . No Repair the (K202) Glow Plug Module Control circuit for an open or high resistance. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
4. GLOW PLUG MODULE CONTROL MODULE Turn the ignition off. Replace the Glow Plug Module in accordance with the service information. Refer to «MODULE, GLOW PLUG, 3.0L DIESEL [EXF], REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/communication-devices/#electronic-control-modules-service-information) . Disconnect the PCM C1 harness connector. Turn the ignition on. With the scan tool, erase DTCs. Cycle the ignition off for 30 seconds, and then back to the on position. With the scan tool, select View DTCs. Did the DTC return? Yes Replace the Powertrain Control Module in accordance with the service information. Refer to «MODULE, POWERTRAIN CONTROL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/communication-devices/#electronic-control-modules-service-information) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Test complete. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .

P0384-GLOW PLUG CONTROL MODULE CONTROL CIRCUIT HIGH

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article .

The Glow Plug Module is located next to the Fuel Filter. The Glow Plug Module receives a signal and ground from the Powertrain Control Module (PCM). The Glow Plug Module supplies power to the Glow Plugs and a ground path is provided through the body of the Glow Plugs. The Glow Plug Module communicates with the PCM over the (K330) Glow Plug Module Diagnostic circuit.

With the ignition on.

The PCM detects a short to voltage on the (K202) Glow Plug Module Control circuit for 0.5 second.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

Scheme 610

1. DTC IS ACTIVE Ignition on, engine not running. With the scan tool, select View DTCs. Is the status Active for this DTC? Yes Go To 2 . No Perform the INTERMITTENT DTC diagnostic procedure. Refer to «INTERMITTENT DTC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
2. CHECK THE (K202) GLOW PLUG MODULE CONTROL CIRCUIT FOR A SHORT Turn the ignition off. Disconnect the Glow Plug Module C1 harness connector. Disconnect the PCM C1 harness connector. Turn the ignition on. Measure the resistance between the (K202) Glow Plug Module Control circuit and all other circuits at the PCM C1 harness connector. Is the resistance above 10k ohms between the (K202) Glow Plug Module Control circuit and all other circuits? Yes Go To 3 . No Repair the (K202) Glow Plug Module Control circuit for a short to the circuit that measured below 10k Ohms. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
3. GLOW PLUG MODULE CONTROL MODULE Turn the ignition off. Replace the Glow Plug Module in accordance with the service information. Refer to «MODULE, GLOW PLUG, 3.0L DIESEL [EXF], REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/communication-devices/#electronic-control-modules-service-information) . Disconnect the PCM C1 harness connector. Turn the ignition on. With the scan tool, erase DTCs. Cycle the ignition off for 30 seconds, and then back to the on position. With the scan tool, select View DTCs. Did the DTC return? Yes Replace the Powertrain Control Module in accordance with the service information. Refer to «MODULE, POWERTRAIN CONTROL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/communication-devices/#electronic-control-modules-service-information) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Test complete. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .

P0401-EGR FLOW INSUFFICIENT DETECTED

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article .

The EGR Airflow Control Valve is a pulse width modulated output, controlled by the Powertrain Control Module (PCM). The EGR Airflow Control Valve is used to control the ratio of fresh air flow to EGR gas air flow. The PCM monitors this ratio with the Mass Air Flow Sensor. The Mass Air Flow Sensor feedback is very prominent in determining the position of the EGR Airflow Control Valve. If the Mass Air Flow Sensor feedback does not match what the PCM is expecting to see when EGR air flow is requested, it can effect the operation of the EGR Valve and the EGR Airflow Control Valve. This can occur if the Mass Air Flow Sensor feedback is faulty or inaccurate, even if no DTCs are actively set. The EGR system and Diesel Particulate Filter regeneration is disabled when the fault is active.

With the engine running.

The Powertrain Control Module (PCM) detects EGR flow is less than the requested flow for 15.0 seconds.

1. CHECK FOR ACTIVE DTC NOTE: If the PCM detects and stores a DTC, the PCM also stores the operating conditions under which the DTC was set. Some of these conditions are displayed on the scan tool at the same time the DTC is displayed. Before erasing stored DTCs, record these conditions. Attempting to duplicate these conditions may assist when checking for an active DTC. NOTE: If there are any Mass Air Flow DTCs present, diagnose the MAF DTCs before continuing EGR diagnostics. Turn the ignition on. With the scan tool, erase PCM DTCs. Test drive the vehicle and monitor the scan tool for PCM DTCs. Did this DTC return? Yes Go To 2 . No Perform the INTERMITTENT DTC diagnostic procedure. Refer to «INTERMITTENT DTC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
2. AIR FILTER Turn the ignition off. Remove and inspect the Air Filter for soiling or excessive dirt and debris which may cause air flow restriction. Were any of these problems found? Yes Replace the Air Filter element in accordance with the service information. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Go To 3 .
3. AIR RESTRICTION Visually inspect the fresh air inlet tube for a blockage due to snow, ice or dirt buildup. Visually inspect the intake system, exhaust system and related tubes and connections. NOTE: Inspect all air intake, crankcase vent and Turbocharger related tubes for damage, restriction or poor connection. Any of these conditions can cause this DTC to set. NOTE: Inspect the exhaust system and related tubes for damage, restriction or poor connection. Any of these conditions can cause this DTC to set. Were any problems found? Yes Repair or replace as necessary. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Go To 4 .
4. CHECK FOR INTAKE SYSTEM LEAKS Carefully inspect the intake system for signs of a leak. If possible, connect the (special tool #8404B, Kit, EELD And Accessory) to the intake system and begin injecting smoke into the system. Observe all intake system components for evidence of leakage. Is there evidence of a leak? Yes Repair or replace as necessary. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Go To 5 .
5. CHECK FOR EGR SYSTEM LEAKS Visually inspect the EGR system for signs of a leak. Look for soot streaks around the valve and connections that would indicate a leak. Is there evidence of a leak? Yes Repair or replace as necessary. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Go To 6 .
6. CHECK THE EGR AIR FLOW CONTROL VALVE Disconnect the air tube at the inlet port of the EGR Air Flow Control Valve. Use a mirror to observe the motion of the EGR Air Flow Control Valve. Turn the ignition on. The EGR Air Flow Control Valve should open completely without binding with the ignition on. NOTE: Cycle the ignition on and off several times while observing the operation of the valve. Did the EGR Air Flow Control Valve operate correctly and without binding? Yes Go To 7 . No Replace the EGR Air Flow Control Valve in accordance with the service information. Refer to «VALVE, EXHAUST GAS RECIRCULATION (EGR) AIRFLOW CONTROL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#emissions-control) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
7. CHECK THE EGR COOLER AND TUBES Turn the ignition off. Gain access to and inspect the EGR Cooler and both tubes that connect to the EGR Cooler. Check tubes and cooler for damage, leaks, excessive soot build up and other problems that could restrict or prevent proper exhaust gas flow. NOTE: Compressed air (at low pressure) can be applied to the lower port of the EGR Cooler. When applying compressed air check for air to flow through cooler and out the upper port. Always wear safety glasses when working with compressed air. Were any problems found? Yes Clean or replace the EGR Cooler or tubes as necessary. Refer to «COOLER, EXHAUST GAS RECIRCULATION (EGR), REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#emissions-control) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Replace the EGR Valve in accordance with the service information. Refer to «VALVE, EXHAUST GAS RECIRCULATION (EGR), REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#emissions-control) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .

P0402-EGR FLOW EXCESSIVE DETECTED

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article .

The EGR Airflow Control Valve is a pulse width modulated output, controlled by the Powertrain Control Module (PCM). The EGR Airflow Control Valve is used to control the ratio of fresh air flow to EGR gas air flow. The PCM monitors this ratio with the Mass Air Flow Sensor. The Mass Air Flow Sensor feedback is very prominent in determining the position of the EGR Airflow Control Valve. If the Mass Air Flow Sensor feedback does not match what the PCM is expecting to see when EGR air flow is requested, it can effect the operation of the EGR Valve and the EGR Airflow Control Valve. This can occur if the Mass Air Flow Sensor feedback is faulty or inaccurate, even if no DTCs are actively set. The EGR system and Diesel Particulate Filter regeneration is disabled when the fault is active.

With the engine running ambient temperature above 19.4°F (-7°C).

The Powertrain Control Module (PCM) detects EGR flow is more than the requested flow for 10.0 seconds.

1. CHECK FOR ACTIVE DTC NOTE: If the PCM detects and stores a DTC, the PCM also stores the operating conditions under which the DTC was set. Some of these conditions are displayed on the scan tool at the same time the DTC is displayed. Before erasing stored DTCs, record these conditions. Attempting to duplicate these conditions may assist when checking for an active DTC. NOTE: If there are any Mass Air Flow DTCs, diagnose the MAF DTCs before continuing EGR diagnostics. Turn the ignition on. With the scan tool, erase PCM DTCs. Test drive the vehicle and monitor the scan tool for PCM DTCs. Did this DTC return? Yes Go To 2 . No Perform the INTERMITTENT DTC diagnostic procedure. Refer to «INTERMITTENT DTC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
2. AIR FILTER Turn the ignition off. Remove and inspect the Air Filter for soiling or excessive dirt and debris which may cause air flow restriction. Were any of these problems found? Yes Replace the Air Filter element in accordance with the service information. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Go To 3 .
3. AIR RESTRICTION Visually inspect the fresh air inlet tube for a blockage due to snow, ice or dirt buildup. Visually inspect the intake system, exhaust system and related tubes and connections. NOTE: Inspect all air intake, crankcase vent and Turbocharger related tubes for damage, restriction or poor connection. Any of these conditions can cause this DTC to set. NOTE: Inspect the exhaust system and related tubes for damage, restriction or poor connection. Any of these conditions can cause this DTC to set. Were any problems found? Yes Repair or replace as necessary. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Go To 4 .
4. CHECK FOR INTAKE SYSTEM LEAKS Carefully inspect the intake system for signs of a leak. If possible, connect the (special tool #8404B, Kit, EELD And Accessory) to the intake system and begin injecting smoke into the system. Observe all intake system components for evidence of smoke leakage. Is there evidence of smoke leakage? Yes Repair or replace as necessary. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Go To 5 .
5. CHECK THE EGR AIR FLOW CONTROL VALVE Disconnect the air tube at the inlet port of the EGR Air Flow Control Valve. Use a mirror to observe the motion of the EGR Air Flow Control Valve. Turn the ignition on. The EGR Air Flow Control Valve should open completely without binding with the ignition on. NOTE: Cycle the ignition on and off several times while observing the operation of the valve. Did the EGR Air Flow Control Valve operate correctly and without binding? Yes Go To 6 . No Replace the EGR Air Flow Control Valve in accordance with the service information. Refer to «VALVE, EXHAUST GAS RECIRCULATION (EGR) AIRFLOW CONTROL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#emissions-control) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
6. CHECK THE EGR COOLER AND TUBES Turn the ignition off. Gain access to and inspect the EGR Cooler and both tubes that connect to the EGR Cooler. Check tubes and cooler for damage, leaks, excessive soot build up and other problems that could restrict or prevent proper exhaust gas flow. NOTE: Compressed air (at low pressure) can be applied to the lower port of the EGR Cooler. When applying compressed air check for air to flow through cooler and out the upper port. Always wear safety glasses when working with compressed air. Were any problems found? Yes Clean or replace the EGR Cooler or tubes as necessary. Refer to «COOLER, EXHAUST GAS RECIRCULATION (EGR), REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#emissions-control) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Replace the EGR Valve in accordance with the service information. Refer to «VALVE, EXHAUST GAS RECIRCULATION (EGR), REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#emissions-control) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .

Scheme 611

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article .

The Exhaust Gas Recirculation (EGR) Valve is opened by a motor located inside the EGR Valve. The pulse width modulated motor is controlled by the Powertrain Control Module (PCM). The EGR Valve also has an internal three wire 5-Volt EGR Position Sensor. This internal sensor reports the position of the valve back to the PCM over the EGR Position Sensor Signal circuit.

With the ignition on and the EGR Solenoid command off.

The PCM detects an open on the EGR Solenoid Control circuit for 0.5 second.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

Scheme 612

Scheme 613

1. DTC IS ACTIVE Ignition on, engine not running. With the scan tool, erase DTCs in the PCM. Start the engine and test drive the vehicle until the engine reaches operating temperature. With the scan tool, select View DTCs. Is the status Active for this DTC? Yes Go To 2 . No Perform the INTERMITTENT DTC diagnostic procedure. Refer to «INTERMITTENT DTC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
2. CHECK THE (K682) EGR CONTROL (+) CIRCUIT FOR AN OPEN/HIGH RESISTANCE Turn the ignition off. Disconnect the EGR Valve harness connector. Disconnect the PCM C2 harness connector. Measure the resistance of the (K682) EGR Control (+) circuit between the EGR Valve harness connector and the PCM C2 harness connector. Is the resistance below 5.0 Ohms? Yes Go To 3 . No Repair the (K682) EGR Control (+) circuit for an open or high resistance. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
3. CHECK THE (K684) EGR CONTROL (-) CIRCUIT FOR AN OPEN/HIGH RESISTANCE Measure the resistance of the (K684) EGR Control (-) circuit between the EGR Valve harness connector and the PCM C2 harness connector. Is the resistance below 5.0 Ohms? Yes Go To 4 . No Repair the (K684) EGR Control (-) circuit for an open or high resistance. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
4. CHECK THE EGR VALVE Replace the EGR Valve in accordance with the service information. Refer to «VALVE, EXHAUST GAS RECIRCULATION (EGR), REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#emissions-control) . Turn the ignition on. With the scan tool, erase DTCs in the PCM. Start the engine and test drive the vehicle until the engine reaches operating temperature. With the scan tool, select View DTCs. Did the DTC return? Yes Go To 5 . No Test complete. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
5. POWERTRAIN CONTROL MODULE Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the EGR Valve and the Powertrain Control Module (PCM). Look for any chafed, pierced, pinched, or partially broken wires. Look for broken, bent, pushed out or corroded terminals. Perform any Technical Service Bulletins that may apply. Were any problems found? Yes Repair as necessary. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Replace the Powertrain Control Module in accordance with the service information. Refer to «MODULE, POWERTRAIN CONTROL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/communication-devices/#electronic-control-modules-service-information) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .

P0404-EGR CONTROL CIRCUIT PERFORMANCE

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article .

The Exhaust Gas Recirculation (EGR) Valve is opened by a motor located inside the EGR Valve. The pulse width modulated motor is controlled by the Powertrain Control Module (PCM). The EGR Valve also has an internal three wire 5-Volt EGR Position Sensor. This internal sensor reports the position of the valve back to the PCM over the EGR Position Sensor Signal circuit.

With the engine running.

The Powertrain Control Module (PCM) detects a short circuit or over current condition on the EGR Valve Control circuits for 0.5 second.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

Scheme 614

Scheme 615

1. DTC IS ACTIVE Ignition on, engine not running. With the scan tool, erase DTCs in the PCM. Start the engine and test drive the vehicle until the engine reaches operating temperature. With the scan tool, select View DTCs. Is the status Active for this DTC? Yes Go To 2 . No Perform the INTERMITTENT DTC diagnostic procedure. Refer to «INTERMITTENT DTC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
2. CHECK THE EGR CONTROL CIRCUITS FOR A SHORT TO VOLTAGE Turn the ignition off. Disconnect the EGR Valve harness connector. Disconnect the PCM C2 harness connector. Remove the ASD Relay from the TIPM. Connect a jumper between cavity 30 and cavity 87 of the ASD Relay connector. Turn the ignition on. Measure the voltage of the: (K682) EGR Control (+) circuit at the EGR Valve harness connector. (K684) EGR Control (-) circuit at the EGR Valve harness connector. Is there any voltage present on either circuit? Yes Go To 3 . No Repair the EGR Control circuit that had voltage present for a short to voltage. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
3. CHECK THE EGR CONTROL CIRCUITS FOR A SHORT TO GROUND Turn the ignition off. Remove the jumper and install the ASD Relay. Measure the resistance between ground and the: (K682) EGR Control (+) circuit at the EGR Valve harness connector. (K684) EGR Control (-) circuit at the EGR Valve harness connector. Is the resistance above 10k Ohms for both measurements? Yes Go To 4 . No Repair the EGR Control circuit that measured below 10k Ohms for a short to ground. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
4. CHECK THE EGR VALVE Replace the EGR Valve in accordance with the service information. Refer to «VALVE, EXHAUST GAS RECIRCULATION (EGR), REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#emissions-control) . Turn the ignition on. With the scan tool, erase DTCs in the PCM. Start the engine and test drive the vehicle until the engine reaches operating temperature. With the scan tool, select View DTCs. Did the DTC return? Yes Go To 5 . No Test complete. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
5. POWERTRAIN CONTROL MODULE Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the EGR Valve and the Powertrain Control Module (PCM). Look for any chafed, pierced, pinched, or partially broken wires. Look for broken, bent, pushed out or corroded terminals. Perform any Technical Service Bulletins that may apply. Were any problems found? Yes Repair as necessary. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Replace the Powertrain Control Module in accordance with the service information. Refer to «MODULE, POWERTRAIN CONTROL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/communication-devices/#electronic-control-modules-service-information) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .

P0405-EGR POSITION SENSOR CIRCUIT LOW

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article .

The Exhaust Gas Recirculation (EGR) Valve is opened by a motor located inside the EGR Valve. The pulse width modulated motor is controlled by the Powertrain Control Module (PCM). The EGR Valve also has an internal three wire 5-Volt EGR Position Sensor. This internal sensor reports the position of the valve back to the PCM over the EGR Position Sensor Signal circuit.

With the ignition on.

The Powertrain Control Module (PCM) detects that the EGR Signal circuit voltage is below the calibrated threshold for 0.5 second.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

Scheme 616

Scheme 617

Scheme 618

Scheme 619

1. DTC IS ACTIVE NOTE: If there are any 5-volt reference DTCs present, diagnose and repair those DTCs before continuing with this test procedure. Ignition on, engine not running. With the scan tool, select View DTCs. Is the status Active for this DTC? Yes Go To 2 . No Perform the INTERMITTENT DTC diagnostic procedure. Refer to «INTERMITTENT DTC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
2. CHECK THE (K834) EGR VALVE 5-VOLT SUPPLY CIRCUIT VOLTAGE Turn the ignition off. Disconnect the EGR Valve Assembly harness connector. Turn the ignition on. Measure the voltage of the (K834) EGR Valve 5-Volt Supply circuit at the EGR Valve Assembly harness connector. Is the measurement above 4.8 volts? Yes Go To 3 . No Repair the (K834) EGR Valve 5-Volt Supply circuit for an open or short to ground. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
3. CHECK THE (K683) EGR POSITION SIGNAL CIRCUIT FOR A SHORT TO GROUND Turn the ignition off. Disconnect the PCM C2 harness connector. Measure the resistance between ground and the (K683) EGR Position Signal circuit at the EGR Valve Assembly. Is the resistance above 10k Ohms? Yes Go To 4 . No Repair the (K683) EGR Position Signal circuit for a short to ground. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
4. CHECK THE (K683) EGR POSITION SIGNAL CIRCUIT FOR A SHORT TO THE (K934) SENSOR GROUND CIRCUIT Measure the resistance between the (K683) EGR Position Signal circuit and the (K934) Sensor Ground circuit at the EGR Valve Assembly. Is the resistance above 10k Ohms? Yes Go To 5 . No Repair the short between the (K683) EGR Position Signal circuit and the (K934) Sensor Ground circuit. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
5. CHECK THE (K683) EGR POSITION SIGNAL CIRCUIT FOR AN OPEN/HIGH RESISTANCE Measure the resistance of the (K683) EGR Position Signal circuit between the EGR Valve Assembly harness connector and the PCM C2 harness connector. Is the resistance below 5.0 Ohms? Yes Go To 6 . No Repair the (K683) EGR Position Signal circuit for an open or high resistance. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
6. CHECK THE EGR VALVE Reconnect the EGR Valve Assembly harness connector. Reconnect the PCM C2 harness connector. Turn the ignition on. With the scan tool, erase DTCs. Turn the ignition off. Disconnect the EGR Valve Assembly harness connector. Connect a jumper between the (K683) EGR Position Signal circuit and the (K834) EGR Valve 5-Volt Supply circuit at the EGR Valve Assembly harness connector. Turn the ignition on. With the scan tool, select View DTCs. NOTE: The scan tool should display a P0406-EGR Position Sensor Circuit High DTC as active or pending with the jumper in place. Does the scan tool display the DTC as described above? Yes Replace the EGR Valve in accordance with the service information. Refer to «VALVE, EXHAUST GAS RECIRCULATION (EGR), REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#emissions-control) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Go To 7 .
7. POWERTRAIN CONTROL MODULE Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the EGR Valve and the Powertrain Control Module (PCM). Look for any chafed, pierced, pinched, or partially broken wires. Look for broken, bent, pushed out or corroded terminals. Perform any Technical Service Bulletins that may apply. Were any problems found? Yes Repair as necessary. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Replace the Powertrain Control Module in accordance with the service information. Refer to «MODULE, POWERTRAIN CONTROL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/communication-devices/#electronic-control-modules-service-information) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .

P0406-EGR POSITION SENSOR CIRCUIT HIGH

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article .

The Exhaust Gas Recirculation (EGR) Valve is opened by a motor located inside the EGR Valve. The pulse width modulated motor is controlled by the Powertrain Control Module (PCM). The EGR Valve also has an internal three wire 5-Volt EGR Position Sensor. This internal sensor reports the position of the valve back to the PCM over the EGR Position Sensor Signal circuit.

With the ignition on.

The Powertrain Control Module (PCM) detects that the EGR Valve Signal circuit voltage is above 4.4 Volts for 0.5 second.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

Scheme 620

Scheme 621

Scheme 622

1. DTC IS ACTIVE Ignition on, engine not running. With the scan tool, select View DTCs. Is the status Active for this DTC? Yes Go To 2 . No Perform the INTERMITTENT DTC diagnostic procedure. Refer to «INTERMITTENT DTC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
2. CHECK THE (K683) EGR POSITION SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE Turn the ignition off. Disconnect the EGR Valve harness connector. Disconnect the PCM C2 harness connector. Remove the ASD Relay from the TIPM. Connect a jumper wire between cavity 30 and cavity 87 of the ASD Relay connector. Turn the ignition on. Measure the voltage of the (K683) EGR Position Signal circuit at the EGR Valve harness connector. Is there any voltage present on either circuit? Yes Go To 3 . No Repair the (K683) EGR Position Signal circuit for a short to voltage. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
3. CHECK THE (K683) EGR POSITION SIGNAL CIRCUIT FOR A SHORT TO THE (K834) EGR VALVE 5-VOLT SUPPLY CIRCUIT Turn the ignition off. Remove the jumper and install the ASD Relay. Measure the resistance between the (K683) EGR Position Signal circuit and the (K834) EGR Valve 5-Volt Supply circuit at the EGR Valve harness connector. Is the resistance above 10k Ohms? Yes Go To 4 . No Repair the short between the (K683) EGR Position Signal circuit and the (K834) EGR Valve 5-Volt Supply circuit. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
4. CHECK THE (K934) SENSOR GROUND CIRCUIT FOR AN OPEN/HIGH RESISTANCE Measure the resistance of the (K934) Sensor Ground circuit between the EGR Valve harness connector and the PCM C1 harness connector. Is the resistance below 5.0 Ohms? Yes Go To 5 . No Repair the (K934) Sensor Ground circuit for an open or high resistance. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
5. CHECK THE EGR VALVE Reconnect the EGR Valve Assembly harness connector. Reconnect the PCM C2 harness connector. Turn the ignition on. With the scan tool, erase DTCs. Turn the ignition off. Disconnect the EGR Valve Assembly harness connector. Connect a jumper between ground and the (K683) EGR Position Signal circuit at the EGR Valve Assembly harness connector. Turn the ignition on. With the scan tool, select View DTCs. NOTE: The scan tool should display a P0405-EGR Position Sensor Circuit Low DTC with the jumper in place. Does the scan tool display the DTC as described above? Yes Go To 6 . No Replace the EGR Valve in accordance with the service information. Refer to «VALVE, EXHAUST GAS RECIRCULATION (EGR), REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#emissions-control) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
6. POWERTRAIN CONTROL MODULE Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the EGR Valve and the Powertrain Control Module (PCM). Look for any chafed, pierced, pinched, or partially broken wires. Look for broken, bent, pushed out or corroded terminals. Perform any Technical Service Bulletins that may apply. Were any problems found? Yes Repair as necessary. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Replace the Powertrain Control Module in accordance with the service information. Refer to «MODULE, POWERTRAIN CONTROL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/communication-devices/#electronic-control-modules-service-information) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .

P042C-CATALYST TEMPERATURE SENSOR CIRCUIT LOW

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article .

The Exhaust Gas Temperature Sensor 1/3 is located at the outlet of the Exhaust Manifold and is accessible from the top of the engine compartment. The Exhaust Gas Temperature Sensor 1/3 operates as a typical two wire 5-Volt sensor. It sends a signal to the Powertrain Control Module (PCM) indicating the temperature of the exhaust gases exiting the Diesel Particulate Filter.

With the engine running.

The PCM detects that the (K372) Exhaust Gas Temperature Sensor 1/3 Signal circuit voltage is below the minimum threshold for 0.5 second.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

1. DTC IS ACTIVE Ignition on, engine not running. With the scan tool, select View DTCs. Is the status Active for this DTC? Yes Go To 2 . No Perform the INTERMITTENT DTC diagnostic procedure. Refer to «INTERMITTENT DTC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
2. CHECK THE EXHAUST GAS TEMPERATURE SENSOR 1/3 Disconnect the Exhaust Gas Temperature Sensor 1/3 harness connector. Turn the ignition on. With the scan tool, select View DTCs. Monitor the scan tool for at least two minutes. NOTE: The scan tool should display an Exhaust Gas Temperature Sensor 1/3 High DTC as active with the Exhaust Gas Temperature Sensor 1/3 connector unplugged. Does the scan tool display the DTC as described above? Yes Replace the Exhaust Gas Temperature Sensor 1/3. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Go To 3 .
3. CHECK THE (K372) EXHAUST GAS TEMPERATURE SENSOR 1/3 SIGNAL CIRCUIT FOR A SHORT TO GROUND Turn the ignition off. Connect the PCM C1 harness connector. Measure the resistance between ground and the (K372) Exhaust Gas Temperature Sensor 1/3 Signal circuit at the Exhaust Gas Temperature Sensor 1/3 harness connector. Is the resistance above 10k Ohms? Yes Go To 4 . No Repair the (K372) Exhaust Gas Temperature Sensor 3 Signal circuit for a short to ground. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
4. CHECK FOR THE (K372) EXHAUST GAS TEMPERATURE SENSOR 1/3 SIGNAL CIRCUIT SHORTED TO THE (K900) SENSOR RETURN CIRCUIT Measure the resistance between the (K372) Exhaust Gas Temperature Sensor 3 Signal circuit and the (K900) Sensor Return circuit at the Exhaust Gas Temperature Sensor 1/3 harness connector. Is the resistance above 10k Ohms? Yes Go To 5 . No Repair the (K372) Exhaust Gas Temperature Sensor 1/3 Signal circuit for a short to the (K900) Sensor Return circuit. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
5. POWERTRAIN CONTROL MODULE Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Exhaust Gas Temperature Sensor 1/3 and the Powertrain Control Module (PCM). Look for any chafed, pierced, pinched, or partially broken wires. Look for broken, bent, pushed out or corroded terminals. Perform any Technical Service Bulletins that may apply. Were any problems found? Yes Repair as necessary. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Replace the Powertrain Control Module (PCM) in accordance with the service information. Refer to «MODULE, POWERTRAIN CONTROL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/communication-devices/#electronic-control-modules-service-information) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .

P042D-CATALYST TEMPERATURE SENSOR CIRCUIT HIGH

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article .

With the ignition on.

The Exhaust Gas Temperature Sensor 1/3 Signal is above the maximum threshold for 0.5 second.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

1. DTC IS ACTIVE Ignition on, engine not running. With the scan tool, select View DTCs. Is the status Active for this DTC? Yes Go To 2 . No Perform the INTERMITTENT DTC diagnostic procedure. Refer to «INTERMITTENT DTC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
2. CHECK THE (K372) EXHAUST GAS TEMPERATURE SENSOR 1/3 SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE Turn the ignition off. Disconnect the Exhaust Gas Temperature Sensor 1/3 harness connector. Turn the ignition on. Measure the voltage of the (K372) Exhaust Gas Temperature Sensor 1/3 Signal circuit at the Exhaust Gas Temperature Sensor 3 harness connector. Does the voltage measure above 5.2 Volts? Yes Repair the (K372) Exhaust Gas Temperature Sensor 1/1 Signal circuit for a short to voltage. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Go To 3 .
3. CHECK THE (K372) EXHAUST GAS TEMPERATURE SENSOR 1/3 SIGNAL FOR AN OPEN/HIGH RESISTANCE Turn the ignition off. Disconnect the PCM C1 harness connector. Measure the resistance of the (K372) Exhaust Gas Temperature Sensor 1/3 Signal circuit between the Exhaust Gas Temperature Sensor 1/3 harness connector and the PCM C1 harness connector. Is the resistance below 5.0 Ohms? Yes Go To 4 . No Repair the (K372) Exhaust Gas Temperature Sensor 1/3 Signal circuit for an open or high resistance. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
4. CHECK THE (K900) SENSOR RETURN CIRCUIT FOR AN OPEN/HIGH RESISTANCE Measure the resistance of the (K900) Sensor Return circuit between the Exhaust Gas Temperature Sensor 1/1 harness connector and the PCM C1 harness connector. Is the resistance below 5.0 Ohms? Yes Go To 5 . No Repair the (K900) Sensor Return circuit for an open or high resistance. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
5. EXHAUST GAS TEMPERATURE SENSOR 1/3 Turn the ignition off. Reconnect the PCM C1 harness connector. Connect a jumper wire between the (K372) Exhaust Gas Temperature Sensor 1/3 Signal circuit and the (K900) Sensor Return circuit at the Exhaust Gas Temperature Sensor 1/3 harness connector. Turn the ignition on. With the scan tool, select View DTCs. NOTE: The scan tool should display an Exhaust Gas Temperature Sensor 1/3 Low DTC as active with the jumper wire in place. Does the scan tool display the DTC as described above? Yes Replace the Exhaust Gas Temperature Sensor 1/3. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Go To 6 .
6. POWERTRAIN CONTROL MODULE Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Exhaust Gas Temperature Sensor 1/3 and the Powertrain Control Module (PCM). Look for any chafed, pierced, pinched, or partially broken wires. Look for broken, bent, pushed out or corroded terminals. Perform any Technical Service Bulletins that may apply. Were any problems found? Yes Repair as necessary. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Replace the Powertrain Control Module (PCM) in accordance with the service information. Refer to «MODULE, POWERTRAIN CONTROL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/communication-devices/#electronic-control-modules-service-information) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .

P042E-EXHAUST GAS RECIRCULATION CONTROL STUCK OPEN

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article .

The Exhaust Gas Recirculation (EGR) Valve is opened by a motor located inside the EGR Valve. The pulse width modulated motor is controlled by the Powertrain Control Module (PCM). The EGR Valve also has an internal three wire 5-Volt EGR Position Sensor. This internal sensor reports the position of the valve back to the PCM over the EGR Position Sensor Signal circuit. The EGR system and Diesel Particulate Filter regeneration will be disabled when the fault is active.

With the engine running.

The Powertrain Control Module (PCM) commands the EGR Valve Control closed and determines by the feedback that the valve is not closed.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

1. DTC IS ACTIVE NOTE: Diagnose and repair any EGR Control Circuit or EGR Position Signal DTCs before continuing with this test procedure. Ignition on, engine not running. With the scan tool, erase DTCs in the PCM. Start the engine and test drive the vehicle until the engine reaches operating temperature. With the scan tool, select View DTCs. Is the status Active for this DTC? Yes Go To 2 . No Perform the INTERMITTENT DTC diagnostic procedure. Refer to «INTERMITTENT DTC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
2. CHECK THE EGR VALVE Replace the EGR Valve in accordance with the service information. Refer to «VALVE, EXHAUST GAS RECIRCULATION (EGR), REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#emissions-control) . Turn the ignition on. With the scan tool, erase DTCs in the PCM. Start the engine and test drive the vehicle until the engine reaches operating temperature. With the scan tool, select View DTCs. Did the DTC return? Yes Go To 3 . No Test complete. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
3. POWERTRAIN CONTROL MODULE Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the EGR Valve and the Powertrain Control Module (PCM). Look for any chafed, pierced, pinched, or partially broken wires. Look for broken, bent, pushed out or corroded terminals. Perform any Technical Service Bulletins that may apply. Were any problems found? Yes Repair as necessary. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Replace the Powertrain Control Module in accordance with the service information. Refer to «MODULE, POWERTRAIN CONTROL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/communication-devices/#electronic-control-modules-service-information) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .

P0462-FUEL LEVEL SENSOR 1 CIRCUIT LOW

For a complete wiring diagram, refer to wiring information .

With the ignition on.

The Powertrain Control Module (PCM) determines that the fuel tank level is below the minimum threshold.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

1. ACTIVE DTC NOTE: The fuel level reading is a BUS Communication signal from the TIPM to the PCM. Diagnose any CAN - C or CAN - B Communication DTCs before continuing. Turn the ignition on. With a scan tool, select View DTCs and record the related Freeze Frame data. Is the DTC Active or Pending at this time? Yes Go To 2 . No Perform the INTERMITTENT DTC diagnostic procedure. Refer to «INTERMITTENT DTC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
2. FUEL LEVEL DTCS IN THE TIPM Turn the ignition on. With a scan tool, select View DTCs in the TIPM. Are there any DTCs Active or Pending at this time? Yes and perform the appropriate diagnostic procedure. Refer to «DIAGNOSTIC CODE INDEX»(/jeep/grand-cherokee/wk2-2010-2013/remont/communication-devices/#totally-integrated-power-module-tipm-diagnostic-code-index) . No Go To 3 .
3. VISUALLY INSPECT FUEL TANK Turn the ignition off. Visually inspect the Fuel Tank for damage that may restrict the Fuel Sending Unit float from moving. Was any damage found? Yes Replace the Fuel Tank in accordance with the service information. Refer to «TANK, FUEL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Go To 4 .
4. CHECK THE FUEL TANK LEVEL Turn the ignition on. With a scan tool, check the fuel tank level reading in the TIPM. Does the reading indicate that there is fuel in the tank? Yes Replace the Powertrain Control Module in accordance with the service information. Refer to «MODULE, POWERTRAIN CONTROL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/communication-devices/#electronic-control-modules-service-information) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Add enough fuel to turn off the low fuel light. Clear the DTC and retest. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .

P0480-COOLING FAN 1 CONTROL CIRCUIT

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article .

With the ignition on and CAN monitoring enabled.

The Powertrain Control Module (PCM) is requesting the Totally Integrated Power Module (TIPM) to turn on the Cooling Fan Relay and it is not operating. The Cooling Fan Relay is located in the Fuses and Relay section of the TIPM.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

1. COOLING FAN RELAY OPERATION Ignition on, engine not running. With a scan tool, actuate the Cooling Fan. Is the Cooling Fan operating? Yes Perform the INTERMITTENT DTC diagnostic procedure. Refer to «INTERMITTENT DTC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Go To 2 .
2. CAN C or ENGINE COOLANT TEMPERATURE (ECT) SENSOR DTCS CURRENTLY ACTIVE Are any CAN C or Engine Coolant Temperature (ECT) Sensor DTCs Active at this time? Yes Perform the appropriate diagnostics for the ECT Sensor or CAN C Bus DTC. No Go To 3 .
3. COOLING FAN CONTROL CIRCUIT DTCS SET IN THE TIPM Are any Cooling Fan Control Circuit DTCs set in the TIPM? Yes Diagnose the appropriate Cooling Fan Control Circuit DTC in the TIPM. Refer to «DIAGNOSIS AND TESTING»(/jeep/grand-cherokee/wk2-2010-2013/remont/communication-devices/#totally-integrated-power-module-tipm-dtcs-b10b4-to-b25ae) . No Go To 4 .
4. POWERTRAIN CONTROL MODULE NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary. Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all power and ground circuits. Were there any problems found? Yes Repair as necessary. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Replace and program the Powertrain Control Module in accordance with the service information. Refer to «MODULE, POWERTRAIN CONTROL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/communication-devices/#electronic-control-modules-service-information) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .

P0489-EGR CONTROL CIRCUIT LOW

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article .

The Exhaust Gas Recirculation (EGR) Valve is opened by a motor located inside the EGR Valve. The pulse width modulated motor is controlled by the Powertrain Control Module (PCM). The EGR Valve also has an internal three wire 5-Volt EGR Position Sensor. This internal sensor reports the position of the valve back to the PCM over the EGR Position Sensor Signal circuit.

With the engine running.

The Powertrain Control Module (PCM) detects a short to ground on the EGR Valve Control circuits for 0.5 second.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

Scheme 623

Scheme 624

1. DTC IS ACTIVE Ignition on, engine not running. With the scan tool, erase DTCs in the PCM. Start the engine and test drive the vehicle until the engine reaches operating temperature. With the scan tool, select View DTCs. Is the status Active for this DTC? Yes Go To 2 . No Perform the INTERMITTENT DTC diagnostic procedure. Refer to «INTERMITTENT DTC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
2. CHECK THE (K682) EGR CONTROL (+) CIRCUIT FOR A SHORT TO GROUND Turn the ignition off. Disconnect the EGR Solenoid harness connector. Disconnect the PCM C2 harness connector. Measure the resistance between ground and the (K682) EGR Control (+) circuit at the EGR Valve harness connector. Is the resistance above 10k Ohms? Yes Go To 3 . No Repair the (K682) EGR Control (+) circuit for a short to ground. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
3. CHECK THE (K684) EGR CONTROL (-) CIRCUIT FOR A SHORT TO GROUND Measure the resistance between ground and the (K684) EGR Control (-) circuit at the EGR Valve harness connector. Is the resistance above 10k Ohms? Yes Go To 4 . No Repair the (K684) EGR Control (-) circuit for a short to ground. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
4. CHECK THE EGR VALVE Replace the EGR Valve in accordance with the service information. Refer to «VALVE, EXHAUST GAS RECIRCULATION (EGR), REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#emissions-control) . Turn the ignition on. With the scan tool, erase DTCs in the PCM. Start the engine and test drive the vehicle until the engine reaches operating temperature. With the scan tool, select View DTCs. Did the DTC return? Yes Go To 5 . No Test complete. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
5. POWERTRAIN CONTROL MODULE Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the EGR Valve and the Powertrain Control Module (PCM). Look for any chafed, pierced, pinched, or partially broken wires. Look for broken, bent, pushed out or corroded terminals. Perform any Technical Service Bulletins that may apply. Were any problems found? Yes Repair as necessary. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Replace the Powertrain Control Module in accordance with the service information. Refer to «MODULE, POWERTRAIN CONTROL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/communication-devices/#electronic-control-modules-service-information) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .

P0490-EGR CONTROL CIRCUIT HIGH

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article .

The Exhaust Gas Recirculation (EGR) Valve is opened by a motor located inside the EGR Valve. The pulse width modulated motor is controlled by the Powertrain Control Module (PCM). The EGR Valve also has an internal three wire 5-Volt EGR Position Sensor. This internal sensor reports the position of the valve back to the PCM over the EGR Position Sensor Signal circuit.

With the ignition on and the EGR Solenoid command on.

The Powertrain Control Module (PCM) detects a short to voltage on the EGR Valve Control circuits for 0.5 second.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

Scheme 625

Scheme 626

1. DTC IS ACTIVE Ignition on, engine not running. With the scan tool, erase DTCs in the PCM. Start the engine and test drive the vehicle until the engine reaches operating temperature. With the scan tool, select View DTCs. Is the status Active for this DTC? Yes Go To 2 . No Perform the INTERMITTENT DTC diagnostic procedure. Refer to «INTERMITTENT DTC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
2. CHECK THE (K682) EGR CONTROL (+) CIRCUIT FOR A SHORT TO VOLTAGE Turn the ignition off. Disconnect the EGR Valve harness connector. Disconnect the PCM C2 harness connector. Remove the ASD Relay from the TIPM. Connect a jumper wire between cavity 30 and cavity 87 of the ASD Relay connector. Turn the ignition on. Measure the voltage of the (K682) EGR Control (+) circuit at the EGR Valve harness connector. Is there any voltage present? Yes Repair the (K682) EGR Control (+) circuit for a short to voltage. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Go To 3 .
3. CHECK FOR THE (K684) EGR CONTROL (-) CIRCUIT SHORTED TO VOLTAGE Measure the voltage of the (K684) EGR Control (-) circuit at the EGR Valve harness connector. Is there any voltage present? Yes Repair the (K684) EGR Control (-) circuit for a short to voltage. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Go To 4 .
4. CHECK THE EGR VALVE Replace the EGR Valve in accordance with the service information. Refer to «VALVE, EXHAUST GAS RECIRCULATION (EGR), REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#emissions-control) . Turn the ignition on. With the scan tool, erase DTCs. Start the engine and test drive the vehicle until the engine reaches operating temperature. With the scan tool, select View DTCs. Did the DTC return? Yes Test complete. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Go To 5 .
5. POWERTRAIN CONTROL MODULE (PCM) Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the EGR Valve and the Powertrain Control Module (PCM). Look for any chafed, pierced, pinched, or partially broken wires. Look for broken, bent, pushed out or corroded terminals. Refer to any Technical Service Bulletins that may apply. Were any problems found? Yes Repair as necessary. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Replace the Powertrain Control Module in accordance with the service information. Refer to «MODULE, POWERTRAIN CONTROL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/communication-devices/#electronic-control-modules-service-information) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .

P049D-EGR CONTROL POSITION EXCEEDED LEARNING LIMIT

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article .

The Exhaust Gas Recirculation (EGR) Valve is opened by a motor located inside the EGR Valve. The pulse width modulated motor is controlled by the Powertrain Control Module (PCM). The EGR Valve also has an internal three wire 5-Volt EGR Position Sensor. This internal sensor reports the position of the valve back to the PCM over the EGR Position Sensor Signal circuit.

In after run mode, during offset learning.

The Powertrain Control Module (PCM) detects that the EGR Valve is not able to be controlled or is sticking.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

1. DTC IS ACTIVE Ignition on, engine not running. With the scan tool, erase DTCs in the PCM. Cycle the ignition on and off several times, leaving the ignition off for two minutes. Turn the ignition on. With the scan tool, select View DTCs. Is the status Active for this DTC? Yes Go To 2 . No Perform the INTERMITTENT DTC diagnostic procedure. Refer to «INTERMITTENT DTC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .
2. CHECK THE EGR VALVE Replace the EGR Valve in accordance with the service information. Refer to «VALVE, EXHAUST GAS RECIRCULATION (EGR), REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#emissions-control) . Turn the ignition on. With the scan tool, erase DTCs. Cycle the ignition on and off several times, leaving the ignition off for two minutes. Turn the ignition on. With the scan tool, select View DTCs. Did the DTC return? Yes Test complete. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Go To 3 .
3. POWERTRAIN CONTROL MODULE Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the EGR Valve and the Powertrain Control Module. Look for any chafed, pierced, pinched, or partially broken wires. Look for broken, bent, pushed out or corroded terminals. Perform any Technical Service Bulletins that may apply. Were any problems found? Yes Repair as necessary. Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) . No Replace the Powertrain Control Module in accordance with the service information. Refer to «MODULE, POWERTRAIN CONTROL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/communication-devices/#electronic-control-modules-service-information) . Perform the PCM VERIFICATION TEST. Refer to «PCM VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#30l-diesel-intermittent-dtc-pcm-verification-test-pcmecmtcm-programming-pre-diagnostic-troubleshooting-procedure) .

See also:
• PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE
• SENSOR, CAMSHAFT POSITION, REMOVAL
• MODULE, POWERTRAIN CONTROL, REMOVAL
• CHECKING THE FUEL DELIVERY SYSTEM
• DIAGNOSIS AND TESTING
• SENSOR, AMBIENT TEMPERATURE, REMOVAL
• STANDARD PROCEDURE
• SENSOR, COOLANT TEMPERATURE, REMOVAL
• CHECKING THE PCM POWER AND GROUND CIRCUITS
• VALVE, EXHAUST GAS RECIRCULATION (EGR) AIRFLOW CONTROL, REMOVAL
• DIAGNOSTIC CODE INDEX