Driveability - Gas - Non-Dtc Based Diagnostics Jeep Grand Cherokee WK2

CHECKING THE FUEL DELIVERY SYSTEM

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

POSSIBLE CAUSES

Scheme 491

1. FUEL PUMP OPERATION Ignition on, engine not running. With the scan tool, actuate the Fuel System test. NOTE: It may be necessary to use a mechanics stethoscope in the next step. Listen for fuel pump operation at the fuel tank. Does the Fuel Pump operate? Yes Go To 2 . No Go To 5 . CAUTION: Stop All Actuations.
2. FUEL PRESSURE WARNING: The fuel system is under a constant pressure (even with the engine off). Before testing or servicing any fuel system hose, fitting, or line, the fuel system pressure must be released. Failure to follow these instructions can result in possible serious or fatal injury. Perform the following procedure to purge air from the system: Open the Fuel System Isolation Valve (1). Close the Flow Test Valve (2). Ignition on, engine not running. With the scan tool, actuate the fuel pump. Open the Flow Test Valve (1) for 10 seconds, then close the Valve. CAUTION: Stop All Actuations. Turn the ignition off. Disconnect, empty and then reconnect the Reservoir Assembly. Turn the ignition on, wait five seconds, turn the ignition off and then wait one minute before proceeding. Read the Fuel Pressure Gauge (3) and record the reading. Choose a conclusion that best matches your fuel pressure reading. Below Specification Go To 3 . Within Specification Test Complete. Above Specification Replace the fuel pressure regulator. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST - NGC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .
3. RESTRICTED FUEL SUPPLY LINE WARNING: The fuel system is under a constant pressure even with the engine off. Before testing or servicing any fuel system hose, fitting or line, the fuel system pressure must be released. Turn the ignition off. Disconnect the Fuel Pressure Decay Tester (special tool #8978A, Decay Tool, Fuel). Raise the vehicle on a hoist and disconnect the fuel pressure line at the fuel pump module. Install the Fuel Pressure Decay Tester (special tool #8978A, Decay Tool, Fuel) between the fuel supply line and the fuel pump module. Ignition on, engine not running. Using the scan tool, actuate the Fuel System test and observe the fuel pressure gauge. CAUTION: Stop All Actuations. Is the fuel pressure within specification now? Yes Repair/replace fuel supply line as necessary. Refer to «TUBE(S), FUEL , DESCRIPTION»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST - NGC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) . No Go To 4 .
4. CHECKING FUEL INLET STRAINER WARNING: The fuel system is under a constant pressure (even with the engine off). Before testing or servicing any fuel system hose, fitting or line, the fuel system pressure must be released. Failure to follow these instructions can result in possible serious or fatal injury. Turn the ignition off. Remove the Fuel Pump Module and inspect the Fuel Inlet Strainer. Refer to «MODULE, FUEL PUMP , REMOVAL - GAS»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . Is the Fuel Inlet Strainer plugged? Yes Replace the Fuel Pump Inlet Strainer. Refer to «MODULE, FUEL PUMP , REMOVAL - GAS»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST - NGC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) . No Replace the Fuel Pump Module. Refer to «MODULE, FUEL PUMP , REMOVAL - GAS»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST - NGC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .
5. FUEL PUMP OUTPUT CIRCUIT OPEN Turn the ignition off. Disconnect the Fuel Pump Module harness connector. Ignition on, engine not running. With the scan tool, actuate the Fuel System test. Using a 12-volt test light connected to ground, probe the Fuel Pump Output circuit. NOTE: The test light should be illuminated and bright. Compare the brightness to that of a direct connection to the battery. Does the test light illuminate brightly? Yes Replace the Fuel Pump Module. Refer to «MODULE, FUEL PUMP , REMOVAL - GAS»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST - NGC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) . No Repair the excessive resistance or open in the Fuel Pump Relay Output circuit. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST - NGC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .

FUEL DELIVERY SYSTEM OUTPUT - FLOW TEST

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

DIAGNOSTIC TEST

Scheme 492

Scheme 493

Scheme 494

1. CHECK FUEL DELIVERY SYSTEM FOR LEAKS AND DAMAGE WARNING: The fuel system is under a constant pressure (even with the engine off). Before testing or servicing any fuel system hose, fitting, or line, the fuel system pressure must be released. Failure to follow these instructions can result in possible serious or fatal injury. Visually and physically inspect the fuel delivery system for external leaks and damage. Is the system leaking or damaged? Yes Repair or replace as necessary. Perform the PCM VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST - NGC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) . No Go To 2 .
2. INSTALL APPROPRIATE FUEL LINE ADAPTERS / FITTING FROM THE GAS AND DIESEL FUEL PRESSURE/DECAY TESTER 8978A Turn the ignition off. WARNING: The fuel system is under a constant pressure (even with the engine off). Before testing or servicing any fuel system hose, fitting, or line, the fuel system pressure must be released. Failure to follow these instructions can result in possible serious or fatal injury. Disconnect the frame rail fuel supply line connector between the fuel supply line and the fuel rail. Install the appropriate Fuel Line Adapters / Fitting from the Gas and Diesel Fuel Pressure/Decay Tester (special tool #8978A, Decay Tool, Fuel). Proceed Go To 3 .
3. INSTALL FUEL PRESSURE GAUGE ASSEMBLY WARNING: The fuel system is under a constant pressure (even with the engine off). Before testing or servicing any fuel system hose, fitting, or line, the fuel system pressure must be released. Failure to follow these instructions can result in possible serious or fatal injury. Connect the Gas and Diesel Fuel Pressure/Decay Tester (special tool #8978A, Decay Tool, Fuel), Fuel Inlet Hose (1) and Fuel Outlet Hose (2) to the Fuel Line Adapters / Fitting. Connect special tool Drain Extension Hose 535680 (3) to the Fuel Pressure Gauge Assembly Drain Hose (5). Connect Reservoir Assembly 534960 (4) to Drain Extension Hose 535680 (3). WARNING: To reduce the risk of fire and possible serious or fatal injury, place Reservoir Assembly 534960 (4) on the floor and out of the way so that it is not a trip hazard. Proceed Go To 4 .
4. CHECK FUEL PRESSURE WARNING: The fuel system is under a constant pressure (even with the engine off). Before testing or servicing any fuel system hose, fitting, or line, the fuel system pressure must be released. Failure to follow these instructions can result in possible serious or fatal injury. Perform the following procedure to purge air from the system: Open the Fuel System Isolation Valve (1). Close the Flow Test Valve (2). Ignition on, engine not running. With the scan tool, actuate the fuel pump. Open the Flow Test Valve (1) for 10 seconds, then close the valve. CAUTION: Stop All Actuations. Turn the ignition off. Disconnect, empty and then reconnect the Reservoir Assembly. Turn the ignition on, wait five seconds, turn the ignition off and then wait one minute before proceeding. Read the Fuel Pressure Gauge (3) and record the reading. and reference the fuel pressure specification. Refer to «FUEL DELIVERY, GAS [ERB, EZH]»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . Is the fuel pressure within specifications? Yes Go To 5 . No Refer to «DIAGNOSIS AND TESTING»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#driveability-gas-non-dtc-based-diagnostics) and perform the CHECKING THE FUEL DELIVERY SYSTEM diagnostic procedure.
5. CHECK FUEL DELIVERY SYSTEM OUTPUT WARNING: The fuel system is under a constant pressure (even with the engine off). Before testing or servicing any fuel system hose, fitting, or line, the fuel system pressure must be released. Failure to follow these instructions can result in possible serious or fatal injury. Ignition on, engine not running. With the scan tool, actuate the fuel pump. Open the Flow Test Valve (1) for 20 seconds, then close the Valve. CAUTION: Stop All Actuations. Turn the ignition off. Measure the amount of fuel in the Reservoir Assembly (2). The fuel output specification is ml/s X 20 seconds = fuel flow in ml. FUEL FLOW ENGINE ml/s ml per 20 Seconds 4 Cylinder and 6 Cylinder 20.8333 417 8 Cylinder 38.88889 778 SRT-4 50 1000 Does the amount of fuel in the reservoir meet or exceed the specification? Yes Test complete. No Refer to «DIAGNOSIS AND TESTING»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#driveability-gas-non-dtc-based-diagnostics) and perform the CHECKING THE FUEL DELIVERY SYSTEM diagnostic procedure.

FUEL PRESSURE LEAK DOWN

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

Scheme 495

1. CHECK FUEL DELIVERY SYSTEM FOR LEAKS AND DAMAGE WARNING: The fuel system is under a constant pressure (even with the engine off). Before testing or servicing any fuel system hose, fitting, or line, the fuel system pressure must be released. Failure to follow these instructions can result in possible serious or fatal injury. Visually and physically inspect the fuel delivery system for external leaks and damage. Is the system leaking or damaged? Yes Repair / replace as necessary. Perform the PCM VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST - NGC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) . No Go To 2 .
2. INSTALL APPROPRIATE FUEL LINE ADAPTERS / FITTING FROM GAS AND DIESEL FUEL PRESSURE/DECAY TESTER 8978A Turn the ignition off. WARNING: The fuel system is under a constant pressure (even with the engine off). Before testing or servicing any fuel system hose, fitting, or line, the fuel system pressure must be released. Failure to follow these instructions can result in possible serious or fatal injury. Disconnect the frame rail fuel supply line connector between the fuel supply line and the fuel rail. Install the appropriate Fuel Line Adapters / Fitting from Gas and Diesel Fuel Pressure/Decay Tester (special tool #8978A, Decay Tool, Fuel). Proceed Go To 3 .
3. INSTALL FUEL PRESSURE GAUGE ASSEMBLY WARNING: The fuel system is under a constant pressure (even with the engine off). Before testing or servicing any fuel system hose, fitting, or line, the fuel system pressure must be released. Failure to follow these instructions can result in possible serious or fatal injury. Connect Fuel Pressure Gauge Assembly Fuel Inlet Hose (special tool #8978-1, Gauge, Fuel Pressure Assembly) (1) and Fuel Outlet Hose (2) to the Fuel Line Adapters / Fitting. Connect Drain Extension Hose 535680 (3) to the Fuel Pressure Gauge Assembly Drain Hose (5). Connect the Reservoir Assembly 534960 (4) to the Drain Extension Hose 535680 (3). WARNING: To reduce the risk of fire and serious possible serious or fatal injury, place Reservoir Assembly 534960 (4) on the floor and out of the way so that it is not a trip hazard. Proceed Go To 4 .
4. CHECK FUEL PRESSURE WARNING: The fuel system is under a constant pressure (even with the engine off). Before testing or servicing any fuel system hose, fitting, or line, the fuel system pressure must be released. Failure to follow these instructions can result in possible serious or fatal injury. Perform the following procedure to purge air from the system: Open the Fuel System Isolation Valve (1). Close the Flow Test Valve (2). Ignition on, engine not running. With the scan tool, actuate the fuel pump. Open the Flow Test Valve (1) for 10 seconds, then close the Valve. CAUTION: Stop All Actuations. Turn the ignition off. Disconnect, empty and then reconnect the Reservoir Assembly. Turn the ignition on, wait five seconds, turn the ignition off and then wait 1 minute before proceeding. Read the Fuel Pressure Gauge (3) and record the reading. Non SRT-4 fuel pressure specification is 407 KPa +/- 34 KPa (59 psi +/- 5 psi). SRT-4 fuel pressure specification is 552 KPa +/- 34 KPa (80 psi +/- 5 psi). Is the fuel pressure within specifications? Yes Go To 5 . No Perform the Checking The Fuel Delivery System diagnostic procedure as directed.
5. CHECK FUEL DELIVERY SYSTEM FOR LEAK DOWN WARNING: The fuel system is under a constant pressure (even with the engine off). Before testing or servicing any fuel system hose, fitting, or line, the fuel system pressure must be released. Failure to follow these instructions can result in possible serious or fatal injury. Close the Fuel System Isolation Valve (1) and then wait five minutes before proceeding. Read the Fuel Inlet (2) and Fuel Outlet (3) Pressure Gauges. The pressure should not drop more than 10 psi on either gauge. Does the fuel pressure drop more than 10 psi? Yes - On Fuel Inlet Gauge (1) Replace the fuel pump module. Perform the PCM VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST - NGC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) . Yes - On Fuel Outlet Gauge (2) Replace the leaking fuel injector(s). Perform the PCM VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST - NGC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) . No If directed here by another test, return to that test. Otherwise, test complete.

1. CHECKING THE EXHAUST SYSTEM FOR LEAKS Turn the ignition off. Raise the vehicle in accordance with the Service Information. WARNING: The normal operating temperature of the exhaust system is very high. Never work around or attempt to service any part of the exhaust system until it has cooled. Special care should be taken when working near the catalytic converter. The temperature of the converter rises to a high level after a short period of engine operating time. Connect Exhaust Cone (special tool #8404-EC, Exhaust Cone)or (special tool #8404-ECT, Exhaust Cone, Truck) to Air Pressure Regulator (with hose) W-18-MIL-1146AS. CAUTION: The air pressure must not exceed 27.6 kPa (4 psi), otherwise engine damage can occur. Attach shop air to the air pressure regulator. Adjust the Air Pressure Regulator to 27.6 kPa (4 psi) Insert the exhaust cone into the vehicle tail pipe. If the vehicle is equipped with dual exhaust. Use the (special tool #8404-ECT, Exhaust Cone, Truck) with equipped attached plug, plug one side of the dual exhaust pipe. Pressurize the other as described above. Apply Mopar® Air Leak Detector PN 05191804AA (or an equivalent leak finder liquid) to the following areas: All welded joints from the exhaust manifold to 45.72 cm (18 inches) behind the downstream O2 sensor O2 sensor seal points O2 sensor boss welds Flange/joint connection(s) Exhaust manifold to cylinder head connection(s) EGR solenoid gasket base and tube seal points (if equipped) Watch for the Mopar® Air Leak Detector PN 05191804AA (or the equivalent leak finder liquid) to bubble. Use the following definitions to help determine if system or component repair/replacement is necessary: Type 1 Leak is defined as a leak where very small foam like bubbles 1 mm (0.04 of an inch) or less appear. Any Type 1 or greater leaks found in welded joints, O2 sensor seal points or O2 sensor boss welds must be repaired or the component must be replaced. Type 2 Leak is defined as a leak where larger bubbles pea size, 8 mm (0.3 of an inch) or greater appear. Any Type 2 or greater leaks found in flange or joint connections, exhaust manifold to cylinder head connections, or EGR gasket and tube seal points must be repaired or the components must be replaced. Leak Location Repair required if results at 27.6 kPa (4 psi) reveal bubble size: Welded joints Type 1, 1 mm (0.04 of an inch) or greater O2 Sensor seal points Type 1, 1 mm (0.04 of an inch) or greater O2 Sensor boss welds Type 1, 1 mm (0.04 of an inch) or greater Flange / joint connections Type 2, 8 mm (0.3 of an inch) or greater Exhaust Manifold to cylinder head connections Type 2, 8 mm (0.3 of an inch) or greater EGR gasket and tube seal points Type 2, 8 mm (0.3 of an inch) or greater If a leak is found that matches the above definition, repair or replace the component as necessary. Once the repair is complete, repeat the procedure to verify that all leaks have been repaired. Were any exhaust leaks found? Yes Repair or replace the leaking exhaust parts as necessary. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST - NGC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) . No Test complete.

CHECKING EXHAUST RESTRICTION

Exhaust system restriction can be checked by measuring back pressure.

1. Disconnect and remove the upstream (before catalytic converter) oxygen sensor. Refer to «SENSOR, OXYGEN , REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) and «SENSOR, OXYGEN , REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) .
2. Install the Exhaust Back Pressure Fitting Adaptor (special tool #CH8519, Hose, Exhaust Back Pressure).
3. Connect a low pressure gauge to the Exhaust Back Pressure Fitting capable of reading the specification in the table below.
4. Apply the park brake and start the engine.
5. With transmission in Park or Neutral, raise engine speed to 2000 RPM. Monitor the pressure. Back pressure should not exceed the specification in the table below. NOTE: For applications with dual catalytic converters, repeat test on opposite converter using the previous steps.
6. If pressure exceeds maximum limits, inspect exhaust system for restricted component. For further catalytic converter inspection procedures. Refer to «CONVERTER, CATALYTIC , INSPECTION»(/jeep/grand-cherokee/wk2-2010-2013/remont/exhaust/#exhaust-system__inspection) . Replace or repair component(s) as necessary.

EXHAUST BACK PRESSURE LIMITS

CHECKING THE OXYGEN SENSOR OPERATION

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

1. OXYGEN SENSOR, WIRING, OR CONNECTORS NOTE: Diagnose and repair any O2 sensor or rationality DTCs before proceeding with this test. NOTE: When performing this procedure as part of another diagnostic process, it may be necessary to repeat this test for all of the oxygen sensors on the vehicle. Turn the ignition off. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Oxygen sensor and the PCM. Look for any chafed, pierced, pinched, or partially broken wires. Look for broken, bent, pushed out or corroded terminals. Turn the ignition on. Monitor the scan tool data relative to the sensor and wiggle test the wiring and connectors. Look for the data to change or for a DTC to set during the wiggle test. If necessary, check each sensor circuit for high resistance or a shorted condition. Were any problems found? Yes Repair as necessary. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST - NGC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) . No Go to 2 .
2. OXYGEN SENSOR VOLTAGE Start the engine and allow it to reach normal operating temperature. WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts or fan. Do not wear loose clothing. Failure to follow these instructions may result in possible serious or fatal injury. With a scan tool, monitor all O2 Sensor voltage readings. Is the voltage switching between 2.5 and 3.4 volts for all O2 sensors? Yes Go to 3 . Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST - NGC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) . No Go to 4 .
3. O2 SENSOR HEATER OPERATION Turn the ignition off. NOTE: Wait a minimum of 10 minutes to allow the O2 Sensor to cool down before continuing the test. Allow the O2 Sensor voltage to stabilize at 5.0 volts. Turn the ignition on. With a scan tool, actuate the O2 Sensor heater. With the scan tool, monitor O2 Sensor voltage for at least 2 minutes. Does the voltage stay above 4.5 volts? Yes Go to 4 . Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST - NGC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) . No Test complete.
4. O2 SENSOR Turn the ignition off. NOTE: Check for contaminants that may cause improper O2 Sensor operation, such as contaminated fuel, unapproved silicone, or evidence of oil or coolant. Disconnect the O2 Sensor harness connector. Turn the ignition on. With a scan tool, monitor the O2 Sensor voltage. NOTE: The voltage should be approximately 5.0 volts with the connector disconnected. Connect a jumper wire between the signal circuit and the return circuit in the O2 Sensor harness connector. NOTE: The voltage should drop from 5.0 volts to 2.5 volts with the jumper wire in place. Is the O2 Sensor voltage displayed on the scan tool as described? Yes Replace the O2 Sensor. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST - NGC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) . No Go to 5 .
5. O2 SENSOR SIGNAL CIRCUIT Using the wiring diagram/schematic as a guide, inspect the O2 Sensor Signal circuit and connectors between the O2 sensor and the PCM. Check the O2 Sensor signal circuit for a short to ground, open circuit, short to voltage, or high resistance. Were any problems found? Yes Repair as necessary. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST - NGC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) . No Go to 6 .
6. O2 SENSOR RETURN CIRCUIT Using the wiring diagram/schematic as a guide, inspect the O2 Sensor Return circuit and connectors between the O2 sensor and the PCM. Check the O2 Sensor return circuit for a short to ground, open circuit, short to voltage or high resistance. Were any problems found? Yes Repair as necessary. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST - NGC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) . No Go to 7 .
7. POWERTRAIN CONTROL MODULE (PCM) Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the O2 sensor and the 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 the components tested in this procedure and wiggle test the wiring and connectors. Look for the data to change or for a DTC to set during the wiggle test. Refer to any Technical Service Bulletins that may apply. Were any problems found? Yes Repair as necessary. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST - NGC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) . No Replace and program the Powertrain Control Module (PCM) in accordance with the Service Information. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST - NGC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .

CHECKING THE PCM POWER AND GROUND CIRCUITS

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

Scheme 496

Scheme 497

Scheme 498

1. PCM WIRING OR CONNECTORS Turn the ignition off. Using the wiring diagram/schematic as a guide, inspect the wiring and each connector at the PCM. Look for any chafed, pierced, pinched, or partially broken wires. Look for broken, bent, pushed out or corroded terminals. Were any problems found? Yes Repair as necessary. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST - NGC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) . No Go To 2 .
2. CHECKING THE PCM GROUND CIRCUITS Turn the ignition off. CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install the PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position) to perform diagnosis. Using a 12 volt test light connected to 12 volts, check the PCM ground circuits. Wiggle test each circuit during the test to check for an intermittent open in the circuit. 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 PCM ground circuit(s) for an open circuit or high resistance. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST - NGC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .
3. CHECKING THE PCM FUSED IGNITION CIRCUITS CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install the PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position) to perform diagnosis. Turn the ignition on. Using a 12 volt test light connected to ground, check the PCM Fused Ignition circuits. Check each circuit with the ignition on, engine running position, and during cranking. Wiggle test each circuit during the test to check for an intermittent open in the circuit. 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 4 . No Repair the open or short to ground in the PCM Fused Ignition circuits. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST - NGC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .
4. CHECKING THE PCM FUSED B+ CIRCUITS Turn the ignition off. CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install the PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position) to perform diagnosis. Using a 12 volt test light connected to Ground, check the PCM Fused B+ circuits. Wiggle test each circuit during the test to check for an intermittent open in the circuit. NOTE: The test light should be illuminated and bright with the ignition on and not illuminated with the ignition off. Compare the brightness to that of a direct connection to the battery. Is the test light illuminated as described above? Yes Test complete. No Repair the open or short to ground in the PCM Fused B+ circuit(s) for as necessary. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST - NGC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .

Scheme 499

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

1. NO START PRE-TEST NOTE: Verify no DTCs are set in the Occupant Restraint Controller. If DTCs are present, they may be the cause of a No Start condition. NOTE: The following list of items must be checked before continuing with any No Start diagnostic tests. The battery must be fully charged and in good condition. A low charged battery may produce invalid test results. If the battery is low, charge the battery and then attempt to start the vehicle by cranking the engine for 15 seconds, three consecutive times. This will allow any DTCs to set that may have been erased due to a dead battery. Try to communicate with PCM using a scan tool. If communication between the scan tool and PCM is not allowed, inspect fuses. If the PCM reports a No Response condition, and perform the No Response from PCM diagnostic procedure. Refer to «DIAGNOSIS AND TESTING»(/jeep/grand-cherokee/wk2-2010-2013/remont/communication-devices/#communication-non-dtc-based-diagnostics) . Make sure the PCM Power and Ground circuits are OK. Using the scan tool, read PCM DTCs. If any DTCs are present, they must be repaired before continuing with any other No Start diagnostic tests. for the related P-code that is reported by the PCM. Refer to «DIAGNOSTIC CODE INDEX - NGC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-diagnostic-code-index) . Make sure that the Bus is functional. Attempt to communicate with the Instrument Cluster and VTSS, If you are unable to establish communications, for the proper Diagnostic procedures. Refer to «DIAGNOSIS AND TESTING»(/jeep/grand-cherokee/wk2-2010-2013/remont/communication-devices/#communication-non-dtc-based-diagnostics) . The Sentry Key Immobilizer System (Wireless Ignition Node) must be operating properly. Check for proper communication with the scan tool and check for DTCs that may be stored in the WIN. Repair the DTCs before continuing. If no DTCs are found, using the scan tool, select Clear PCM (BATT Disconnect). Crank the engine several times. Using the scan tool, read DTCs. If a DTC is present, perform the DTC diagnostics before continuing. Were any problems found? Yes Repair as necessary. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST - NGC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) . No Go To 2 .
2. OPEN FUSE Check for any open fuses in the IPM or Junction Block that may be related to the No Start condition. Are any of the fuses open? Yes Replace the open fuse and check the related circuit(s) for a short to ground. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST - NGC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) . No Go To 3 .
3. CRANKSHAFT POSITION SENSOR Turn the ignition off. Disconnect the CKP Sensor. Attempt to start the engine. Does the engine start? Yes Replace the Crankshaft Position Sensor in accordance with the Service Information. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST - NGC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) . No Go To 4 .
4. CAMSHAFT POSITION SENSOR Turn the ignition off. Connect the CKP Sensor. Disconnect the CMP Sensor. Attempt to start the engine. Does the engine start? Yes Replace the Camshaft Position Sensor in accordance with the Service Information. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST - NGC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) . No Go To 5 .
5. FUSED B+ CIRCUIT CHECK Turn the ignition off. Disconnect the C1 PCM harness connector. CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install the PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position) to perform diagnosis. Using a 12-volt test light connected to ground, probe the Fused B+ circuits. Does the test light illuminate brightly? Yes Go To 6 . No Repair the open or short to ground in the Fused B+ circuit. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST - NGC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .
6. (A142) ASD RELAY OUTPUT CIRCUIT OPEN Turn the ignition off. Remove the ASD relay from the IPM. Disconnect the C3 PCM harness connector. Verify the ASD Relay is getting voltage on the Fused B+ circuits before continuing. CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install the PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position) to perform diagnosis. Measure the resistance of the (A142) ASD Relay Output circuit from the ASD Relay connector to the appropriate terminals of PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position), Ignition coil, and the fuel injectors. Is the resistance below 5.0 Ohms? Yes Go To 7 . No Repair the open in the (A142) ASD Relay Output circuit. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST - NGC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .
7. FUEL PUMP DELIVERY Verify that the Fuel tank is not empty before continuing. Follow the diagnostics for Checking the Fuel Delivery System in the appropriate Electrical Diagnostic Information. Was the No Start condition solved after following the Checking the Fuel Delivery System diagnostic procedure? Yes Test Complete. No Go To 8 .
8. ENGINE MECHANICAL Check for any of the following conditions/mechanical problems. ENGINE COMPRESSION - must be within specifications ENGINE EXHAUST SYSTEM - must be free of any restrictions or leaks. ENGINE VALVE TIMING - must be within specifications, check for broken timing components Are there any engine mechanical problems? Yes Repair as necessary. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST - NGC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) . No Go To 9 .
9. POWERTRAIN CONTROL MODULE (PCM) 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 POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST - NGC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) . No Replace and program the Powertrain Control Module in accordance with the Service Information. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST - NGC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .

ETC INTERMITTENT NO CRANK CONDITION

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

1. ETC STARTER INHIBIT NOTE: This ETC equipped engine will try to relearn ETC position when the key is left in the on position for an extended period of time and will not allow the starter to crank during this procedure. This procedure can take up to 2.5 seconds. To verify the cause of the no crank condition or delayed crank use the scan tool, and read the ETC Starter Inhibit mileage. The controller will store the mileage at which the no start condition occurred because of the ETC testing procedure. This is considered normal operation for a vehicle equipped with an Electronic Throttle Control System and no repairs are necessary. Is a mileage stored under the ETC Starter Inhibit? Yes Test Complete. No Refer to the appropriate diagnostic procedure for further assistance if any other DTC's are set. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST - NGC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .

HARD START FUEL SYSTEM

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

1. CHECKING FUEL PRESSURE WARNING: The fuel system is under a constant pressure (even with the engine off). Before testing or servicing any fuel system hose, fitting or line, the fuel system pressure must be released. Failure to follow these instructions can result in possible serious or fatal injury. Turn the ignition off. Install the Fuel Pressure Decay Tester (special tool #8978A, Decay Tool, Fuel) at the engine. Ignition on, engine not running. With a scan tool, actuate the ASD Fuel System test and observe the fuel pressure gauge. NOTE: Fuel pressure specification is 407 kPa +/- 34 kPa (59 psi +/- 5 psi). Choose a conclusion that best matches your fuel pressure reading. Below Specification Go To 2 . Within Specification Go To 4 .
2. RESTRICTED FUEL SUPPLY LINE WARNING: The fuel system is under a constant pressure (even with the engine off). Before testing or servicing any fuel system hose, fitting or line, the fuel system pressure must be released. Failure to follow these instructions can result in possible serious or fatal injury. Turn the ignition off. Remove the Fuel Pressure Decay Tester (special tool #8978A, Decay Tool, Fuel). Raise the vehicle on a hoist, and disconnect the fuel pressure line at the fuel pump module. Install the Fuel Pressure Decay Tester (special tool #8978A, Decay Tool, Fuel) between the fuel supply line and the fuel pump module. Ignition on, engine not running. With the scan tool, actuate the ASD Fuel System test and observe the fuel pressure gauge. NOTE: Fuel pressure specification is 407 kPa +/- 34 kPa (59 psi +/- 5 psi). Is the fuel pressure within specification? Yes Visually and physically inspect the fuel supply lines between the fuel tank and the fuel rail. Repair/replace as necessary. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST - NGC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) . No Go To 3 .
3. CHECKING THE FUEL INLET STRAINER WARNING: The fuel system is under a constant pressure (even with the engine off). Before testing or servicing any fuel system hose, fitting or line, the fuel system pressure must be released. Failure to follow these instructions can result in possible serious or fatal injury. Turn the ignition off. Remove the Fuel Pump Module and inspect the Fuel Inlet Strainer. Is the Fuel Inlet Strainer plugged? Yes Replace the Fuel Pump Inlet Strainer. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST - NGC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) . No Replace the Fuel Pump Module. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST - NGC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .
4. FUEL PUMP MODULE NOTE: Before continuing visually and physically inspect the fuel delivery system for external leaks or damage. Repair/replace as necessary. WARNING: The fuel system is under a constant pressure (even with the engine off). Before testing or servicing any fuel system hose, fitting or line, the fuel system pressure must be released. Failure to follow these instructions can result in possible serious or fatal injury. Turn the ignition off. Install the Fuel Pressure Decay Tester (special tool #8978A, Decay Tool, Fuel) at the intake manifold. Start the engine and allow the fuel system to reach maximum pressure. Turn the ignition off. Close the Fuel System Isolation Valve and then wait 5 minutes before proceeding. NOTE: Fuel specification is 407 KPa +/- 34 KPa (59 psi +/- 5 psi). Read the Fuel Inlet and Fuel Outlet Pressure Gauges. The pressure should not drop more than 10 psi on either gauge. Monitor the fuel pressure gauge for a minimum of 5 minutes. Does the fuel pressure drop more than 10 psi? Yes - On Fuel Inlet Gauge Replace Fuel Pump Module. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST - NGC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) . Yes - On Fuel Outlet Gauge Replace the leaking fuel injector(s). Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST - NGC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) . No If directed here by another test, return to that test. Otherwise, test complete.

NO CRANK CONDITION

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

1. MECHANICAL CONDITION NOTE: Install a known good Starter relay and see if the vehicle will start. NOTE: Verify the battery is fully charged and capable of passing a load test before continuing. WARNING: Make sure the battery is disconnected, then wait two minutes before proceeding. Failure to do so may result in possible serious or fatal injury. Turn the engine over by hand to make sure the engine is not seized. Is the engine able to turn over? Yes Go To 2 . No Repair the mechanical condition preventing the starter motor from cranking. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST - NGC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .
2. REMOTE START ANTENNA NOTE: If the vehicle is not equipped with Remote Start, proceed to the next test step. Reconnect the battery. Turn the ignition on. Using the scan tool, erase DTCs. Turn the ignition off. Disconnect the Remote Start Antenna from the Wireless Ignition Node (WIN). Using the ignition key, start the vehicle. Did the vehicle start? Yes Replace the Remote Start Antenna in accordance with the 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) . No Go To 3 .
3. PCM FUSED B+ CIRCUITS Turn the ignition off. Disconnect the C1 PCM harness connector. CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install the PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position) to perform diagnosis. Using a 12-volt test light connected to ground, probe the Fused B+ circuits at the appropriate terminals of the PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position). Does the test light illuminate brightly? Yes Go To 4 . No Repair the open or short to ground in the PCM Fused B+ circuits. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST - NGC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .
4. TRANSMISSION RANGE SENSOR Turn the ignition off. Disconnect the TRS harness connectors. Move the Gear selector through all gear positions, from Park to 1st and back. While moving the gear selector through each gear, measure the resistance between ground and the TRS (T41) Sense (P/N Position Switch Sense) circuit at the TRS connector. NOTE: The circuit is grounded in Park and Neutral and open in the other positions. Did the resistance change from above 100 kOhms (open) to below 10.0 Ohms (grounded) ? Yes Go To 5 . No Replace the Transmission Range Sensor. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST - NGC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .
5. EXCESSIVE RESISTANCE IN THE BATTERY CIRCUIT Turn the ignition off. Check the Battery Cables for excessive resistance using the service information procedure. Did either Battery Cable have a voltage drop greater than 0.2 of a volt? Yes Repair the excessive resistance in the Battery circuit. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST - NGC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) . No Go To 6 .
6. STARTER CAUTION: The Parking Brake must be on and the Transmission must be in park for a vehicle equipped with an automatic transmission. WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts or fan. Do not wear loose clothing. Failure to follow these instructions may result in possible serious or fatal injury. Turn ignition off. Disconnect the Starter Solenoid harness connector. NOTE: The Stater Solenoid harness connector must remain disconnected at this time. Have an assistant turn the ignition key to the CRANK position. Using a 12-volt test light connected ground, probe the (T750) Stater Relay Output circuit in the Starter Solenoid harness connector while the ignition key is in the CRANK position. Does the test light illuminate brightly? Yes Replace the Starter in accordance with the service information. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST - NGC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) . No Go To 7 .
7. (T752) STARTER OVERRIDE CIRCUIT CHECK NOTE: Inspect fuses related to the Starter. Turn the ignition off. Disconnect the TIPM C2 harness connector. Disconnect the PCM C3 harness connector. CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install the PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position) to perform diagnosis. Check the T752 Starter Relay Control circuit for and open or short to ground. Were any problems found in the T752 Starter Override circuit between the TIPM and PCM? Yes Repair as necessary. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST - NGC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) . No Go To 8 .
8. (T750) STARTER CONTROL OUTPUT CIRCUIT OPEN Disconnect the Starter Solenoid connector. Measure the resistance of the (T750) Starter Control Output circuit between the Starter Solenoid harness connector and the TIPM C2 harness connector. Is the resistance below 5.0 Ohms? Yes Go To 9 . No Repair the open in the (T750) Starter Control Output circuit. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST - NGC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .
9. (T750) STARTER CONTROL OUTPUT CIRCUIT SHORTED TO GROUND Measure the resistance between ground and the (T750) Starter Control Output circuit in the Starter Solenoid harness connector. Is the resistance below 100 Ohms? Yes Repair the short to ground in the (T750) Starter Control Output circuit. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST - NGC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) . No Go To 10 .
10. TOTALLY INTEGRATED POWER MODULE NOTE: Before continuing, check the TIPM 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 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 in accordance with the 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) .

NO RESPONSE WITH A NO START CONDITION

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

Scheme 500

Scheme 501

Scheme 502

1. (A209) PCM FUSED B+ CIRCUIT NOTE: The scan tool and cable must be operating properly for the results of this test to be valid. NOTE: Make sure the ignition switch was on while trying to communicate with the PCM. Turn the ignition off. Disconnect the C1 PCM harness connector. CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install the PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position) to perform diagnosis. Using a 12-volt test light connected to ground, probe the (A209) Fused B+ circuit in the appropriate terminal of PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position). Does the test light illuminate brightly? Yes Go To 2 . No Repair the open or short to ground in the (A209) Fused B+ circuit. Inspect and replace fuses as necessary. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST - NGC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .
2. (F942), (F1), (F26) PCM FUSED IGNITION SWITCH CIRCUITS Using a 12-volt test light connected to ground, probe the (F942), (F1), (F26) PCM Fused Ignition Switch Output circuit in the appropriate terminals of PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position). Does the test light illuminate brightly? Yes Go To 3 . No Repair the open or short to ground in the (F942), (F1), (F26) Ignition Switch Output circuit. Inspect and replace fuses as necessary. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST - NGC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .
3. (Z130), (Z816) PCM GROUND CIRCUITS Using a 12-volt test light connected to battery voltage, probe the (Z130), (Z816) PCM ground circuits in the appropriate terminals of PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position). Does the test light illuminate brightly? Yes Go To 4 . No Repair the open or excessive resistance in the (Z130), (Z816) PCM ground circuits. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST - NGC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .
4. (F855) 5-VOLT SUPPLY CIRCUIT Turn the ignition off. Connect the PCM harness connectors. Disconnect the Crankshaft Position Sensor harness connector. Ignition on, engine not running. Measure the voltage on the (F855) 5-Volt Supply circuit. Is the voltage between 4.5 and 5.2 Volts? Yes Go To 5 . No Go To 6 .
5. CKP SENSOR Turn the ignition off. Disconnect the Throttle Body harness connector. Ignition on, engine not running. Measure the voltage on the (F855) 5-Volt Supply circuit in the Throttle Body harness connector. Is the voltage between 4.5 and 5.2 Volts? Yes If communication is available with a PCM on a like vehicle, replace and program the Powertrain Control Module in accordance with the service information. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST - NGC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) . No Replace the Crankshaft Position Sensor. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST - NGC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .
6. (F855) 5-VOLT SENSOR OPEN/SHORTED Turn the ignition off. Disconnect the Throttle Body harness connector. Ignition on, engine not running. Measure the voltage on the (F855) 5-Volt Supply circuit. Disconnect all the sensors that use the (F855) 5-Volt Supply circuit. Did the voltage return to 4.5 to 5.2 Volts when disconnecting any of the sensors. Yes Replace the sensor that is pulling down the (F855) 5-Volt supply. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST - NGC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) . No Go To 7 .
7. (F855) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND Turn the ignition off. Disconnect PCM harness connectors. Disconnect all the sensors that share the (F855) 5-Volt Supply circuit. Measure the resistance between ground and the (F855) 5-Volt Supply circuit at one of the sensor harness connectors. Is the resistance below 100 Ohms? Yes Repair the short to ground in the (F855) 5-Volt Supply circuit. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST - NGC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) . No Go To 8 .
8. (F856) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND Disconnect all the sensors that share the (F856) 5-Volt Supply circuit. Measure the resistance between ground and the (F856) 5-Volt Supply circuit at one of the sensor harness connectors. Is the resistance below 100 Ohms? Yes Repair the short to ground in the (F856) 5-Volt Supply circuit. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST - NGC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) . No Go To 9 .
9. POWERTRAIN CONTROL MODULE (PCM) Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the related Sensors 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. Verify that there is good pin to terminal contact in the related Sensor and Powertrain Control Module connectors. Perform any Technical Service Bulletins that may apply. Were there any problems found? Yes Repair as necessary. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST - NGC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) . No Replace and program the Powertrain Control Module in accordance with the service information. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST - NGC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .

START AND STALL CONDITION

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

Scheme 503

Scheme 504

1. CHECKING DTCS NOTE: Before continuing with this procedure, review the TSBs that mat be related to a start and stall condition. NOTE: It may be helpful to review Secondary Indicators, if a two trip DTCs is present, drive the vehicle to try and mature the DTC to Active. Ignition on, engine not running. With a scan tool, read DTCs. Are any DTCs present? Yes Perform the appropriate Diagnostic Procedure. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST - NGC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc). No Go To 2.
2. CHECKING VEHICLE THEFT DTCS Using the scan tool, read the Wireless Ignition Node (WIN) codes. Are there any SKIM/SKREEM DTCs present in the WIN? Yes Refer to «DIAGNOSIS AND TESTING»(/jeep/grand-cherokee/wk2-2010-2013/remont/door-locks-anti-theft-systems/#wireless-ignition-node-win-electrical-diagnostics) and perform the appropriate diagnostic procedure. No Go To 3.
3. CAM/CRANK VERIFICATION Using a scan tool, under OBDII Monitors, read and record the Cam Crank Synchronization Event Monitors. CAM EVENT STATUS CM1ULTRH CM1ULTLH CM1TOL1 CM1LOW CM1ULZERO CM1MFS CM1MFR CM1IF CM1ONLY CM2ULTRH CM2ULTLH CM2TOL1 CM2LOW CM2ULZERO CM2MFS CM2MFR CM2IF CM2ONLY CM3ULTRH CM3ULTLH CM3TOL1 CM3LOW CM3ULZERO CM3MFS CM3MFR CM3IF CM3ONLY CM4ULTRH CM4ULTLH CM4TOL1 CM4LOW CM4ULZERO CM4MFS CM4MFR CM4IF CM4ONLY SYULCAM - - - - - CRANK EVENT STATUS CKULTRH CKULTLH CKLOW CKUL60M2 CKMFS CKMFR CK1IF CKULGTRH CKULGTLH CKULGTVR CKULGTVL CKUL220 CKUL40 SYULCRK SYNOCLCK - - - - - - SYNC EVENT STATUS SYULTOL SYTOLF - - - - - Use the table above and determine if any of the values are present in the Cam Crank Synchronization Event Monitor display. CAM EVENT STATUS ONLY Go To 7. CRANK EVENT STATUS ONLY Go To 13. CAM, CKP and/or SYNC EVENT STATUS Go To 19. None Present Go To 4.
4. SPARK PLUG(S) NOTE: Inspect the ignition coil for damage, carbon tracking on the coil or a damaged spark plug insulator boot. If a problem is found, replace the ignition coil. Turn the ignition off. Remove the spark plug. Inspect the spark plug for any of the following conditions: Cracks or damage Carbon tracking Foreign material Gap not within specification Loose or broken electrode NOTE: Lightly tap the bottom of the spark plug on a solid surface. The electrode in the spark plug should not move. Were any problems found? Yes Replace the spark plug. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST - NGC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc). No Go To 5.
5. POSSIBLE CAUSES OF START AND STALL CONDITION The following items should be checked as a possible cause for a start and stall condition: Perform any Technical Service Bulletins (TSBs) that may apply to the symptom. The exhaust system must be free of any restrictions. The engine compression must be within specifications. The engine valve timing must be within specifications. The engine must be free from vacuum leaks. The throttle body must be free of carbon buildup and dirt. Cracked spark plugs, carbon track on spark plugs, spark plug wires if applicable, coil, and coil boot. Do any of the above conditions exist? Yes Repair as necessary. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST - NGC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc). No Go To 6.
6. FUEL PUMP DELIVERY Verify that the Fuel tank is not empty before continuing. Follow the diagnostics for Checking Fuel Delivery in this information. Was the No Start condition solved after following the above diagnostic test? Yes Test Complete. No Check for contamination/water in the fuel. Make sure the fuel being used in this vehicle meets OEM Fuel Requirement, perform the appropriate service procedure. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST - NGC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc).
7. 5 VOLT SUPPLY CIRCUIT VOLTAGE (CMP) Turn the ignition off. Disconnect the Camshaft Position Sensor connector. Turn the ignition on. Measure the voltage of the between the Sensor Ground circuit and the 5 Volt Supply circuit in the Camshaft Position Sensor harness connector. Is the voltage 5.0 Volts? Yes Go To 8. No Measure the voltage of the 5 Volt supply circuit between a known good ground and the 5 Volt supply circuit. If your reading is still low repair the 5 Volt supply circuit. If the voltage reading is 5 Volts repair the Sensor Ground circuit. NOTE: A battery disconnect must be performed to clear the Cam Crank Synchronization Events. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST - NGC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc).
8. CMP SIGNAL Turn the ignition on. Measure the voltage of the CMP Signal circuit in the Camshaft Position Sensor harness connector. Is the voltage between 4.7 and 5.0 Volts? Yes Go To 12. No Go To 9.
9. CMP SIGNAL CIRCUIT SHORTED TO VOLTAGE Turn the ignition off. Disconnect the Powertrain Control Module harness connector. Turn the ignition on. Measure the voltage of the CMP Signal circuit in the Camshaft Position Sensor harness connector. Is there any voltage present? Yes Repair the short to voltage in the CMP Signal circuit. NOTE: A battery disconnect must be performed to clear the Cam Crank Synchronization Events. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST - NGC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc). No Go To 10.
10. CMP SIGNAL CIRCUIT SHORTED TO GROUND Turn the ignition off. Measure the resistance between ground and the CMP Signal circuit in the Camshaft Position Sensor harness connector. Is the resistance above 100 Ohms? Yes Go To 11. No Repair the short to ground in the CMP Signal circuit. NOTE: A battery disconnect must be performed to clear the Cam Crank Synchronization Events. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST - NGC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc).
11. CMP SIGNAL CIRCUIT OPEN OR HIGH RESISTANCE CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals, resulting in poor terminal to pin connection. Install the PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position) to perform diagnosis. Measure the resistance of the CMP Signal circuit between the Camshaft Position Sensor harness connector and the appropriate terminal of PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position). Is the resistance below 5.0 Ohms? Yes Go To 22. No Repair the excessive resistance in the CMP Signal circuit. NOTE: A battery disconnect must be performed to clear the Cam Crank Synchronization Events. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST - NGC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc).
12. CAMSHAFT POSITION SENSOR SIGNAL Turn the ignition off. (Scheme 503) is a depiction of typical scope patterns of the Cam (1) and Crank (2) sensors for 4, 6, and 8 cylinder engines. The square wave patterns are uniform and are identical to one another. The patterns must be evenly spread apart and at the same height. The larger gap pattern (signature) after the shorter wave forms are used for cylinder identification (Crank signal) and the distance between the series of slots (trigger) on the camshaft pulley (cam signal). Any variation of the pattern will indicate an issue with the sensor, wiring, or trigger (target) wheel. CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install the PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position) along with the Adapter (special tool #8815-1, PCM Pinout Box Adapter) to perform the diagnosis. With a lab scope, probe the CMP Signal circuit in the appropriate terminal of the PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position). WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts or fan. Do not wear loose clothing. Failure to follow these instructions may result in possible serious or fatal injury. Start and allow the engine to run. Observe the lab scope screen. Compare the scope pattern with the ones in (Scheme 504). 1. Pattern indicates a clean (good) square wave form that is identical to what the cam and crank should be. The square wave patterns are uniformed and are identical to one another. 2. Two pulses joined together in the same spot on target. Indicates damage to the target (trigger) on the flexplate or broke tooth, runout in the target or large airgap between the sensor and the target wheel. 3. Wide airgap or intermittent connection. 4. Early signature, predominately at high speed. Large airgap between the sensor and the target wheel. 5. Missed pulse. Possible burr or light damage to target or incorrect lateral position of the crank sensor to target (trigger). NOTE: If any of the above (except pattern 1) is displayed on the lab scope repair as necessary. Was the square wave found to match any of the above except pattern 1? Yes Repair as necessary. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST - NGC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc). No Replace the Camshaft Position Sensor in accordance with the Service Information. NOTE: A battery disconnect must be performed to clear the Cam Crank Synchronization Events. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST - NGC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc).
13. 5 VOLT SUPPLY CIRCUIT VOLTAGE (CKP) Turn the ignition off. Disconnect the Crankshaft Position Sensor connector. Turn the ignition on. Measure the voltage of the between the Sensor Ground circuit and the 5 Volt Supply circuit in the Crankshaft Position Sensor harness connector. Is the voltage 5.0 Volts? Yes Go To 14. No Measure the voltage of the 5 Volt Supply circuit between a known good ground and the 5 Volt supply circuit. If your reading is still low repair the 5 Volt Supply circuit. If the voltage reading is 5 Volts repair the Sensor Ground circuit. NOTE: A battery disconnect must be performed to clear the Cam Crank Synchronization Events. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST - NGC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc).
14. CKP SIGNAL Turn the ignition on. Measure the voltage of the CKP Signal circuit in the Crankshaft Position Sensor harness connector. Is the voltage between 4.7 and 5.0 Volts? Yes Go To 18. No Go To 15.
15. CKP SIGNAL CIRCUIT SHORTED TO VOLTAGE Turn the ignition off. Disconnect the C2 Powertrain Control Module (PCM) harness connector. Turn the ignition on. Measure the voltage of the CKP Signal circuit in the Crankshaft Position Sensor harness connector. Is there any voltage present? Yes Repair the short to voltage in the CKP Signal circuit. NOTE: A battery disconnect must be performed to clear the Cam Crank Synchronization Events. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST - NGC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc). No Go To 16.
16. CKP SIGNAL CIRCUIT SHORTED TO GROUND Turn the ignition off. Measure the resistance between ground and the CKP Signal circuit in the Crankshaft Position Sensor harness connector. Is the resistance above 100 Ohms? Yes Go To 17. No Repair the short to ground in the CKP Signal circuit. NOTE: A battery disconnect must be performed to clear the Cam Crank Synchronization Events. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST - NGC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc).
17. CKP SIGNAL CIRCUIT OPEN OR HIGH RESISTANCE CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals, resulting in poor terminal to pin connection. Install the PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position) to perform diagnosis. Measure the resistance of the CKP Signal circuit between the Crankshaft Position Sensor harness connector and the appropriate terminal of PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position). Is the resistance below 5.0 Ohms? Yes Go To 22. No Repair the excessive resistance in the CKP Signal circuit. NOTE: A battery disconnect must be performed to clear the Cam Crank Synchronization Events. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST - NGC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc).
18. CRANKSHAFT POSITION SENSOR SIGNAL Turn the ignition off. see scheme 24 is a depiction of typical scope patterns of the Cam (1) and Crank (2) sensors for 4, 6, and 8 cylinder engines. The square wave patterns are uniform and are identical to one another. The patterns must be evenly spread apart and at the same height. The larger gap pattern (signature) after the shorter wave forms are used for cylinder identification (Crank signal) and the distance between the series of slots (trigger) on the camshaft pulley (cam signal). Any variation of the pattern will indicate an issue with the sensor, wiring, and trigger (target) wheel. CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install the PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position) along with the Adapter (special tool #8815-1, PCM Pinout Box Adapter) to perform the diagnosis. With a lab scope, probe the CKP Signal circuit in the appropriate terminal of the PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position). WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts or fan. Do not wear loose clothing. Failure to follow these instructions may result in possible serious or fatal injury. Start and allow the engine to run. Observe the lab scope screen. Compare the scope pattern with the ones in see scheme 25. 1. Pattern indicates a clean (good) square wave form that is identical to what the cam and crank should be. The square wave patterns are uniformed and are identical to one another. 2. Two pulses joined together in the same spot on target. Indicates damage to the target (trigger) on the flexplate or broke tooth, runout in the target or large airgap between the sensor and the target wheel. 3. Wide airgap or intermittent connection. 4. Early signature, predominately at high speed. Large airgap between the sensor and the target wheel. 5. Missed pulse. Possible burr or light damage to target or incorrect lateral position of the crank sensor to target (trigger). NOTE: If any of the above (except pattern 1) is displayed on the lab scope repair as necessary. Was the square wave found to match any of the above except pattern 1? Yes Repair as necessary. NOTE: A battery disconnect must be performed to clear the Cam Crank Synchronization Events. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST - NGC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc). No Replace the Crankshaft Position Sensor. NOTE: A battery disconnect must be performed to clear the Cam Crank Synchronization Events. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST - NGC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc).
19. VALVE TIMING Make sure the valve timing is within specification. Was the valve timing within specification? Yes Go To 20. No Repair as necessary. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST - NGC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc).
20. 5 VOLT SUPPLY CIRCUIT VOLTAGE (CMP/CKP) NOTE: The 5 Volt Supply circuit must be present at both CMP and CKP Sensors. Turn the ignition off. Disconnect the Camshaft Position Sensor connector. Turn the ignition on. Measure the voltage of the 5 Volt Supply circuit in the Camshaft Position Sensor harness connector. Repeat the above test at the Crankshaft Position Sensor (Crankshaft Position Sensor harness connector measure). Is the voltage 5.0 Volts at each sensor? Yes Go To 21. No Repair the 5 Volt Supply circuit(s) as necessary. NOTE: A battery disconnect must be performed to clear the Cam Crank Synchronization Events. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST - NGC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc).
21. SENSOR GROUND CIRCUIT NOTE: The Ground circuit must be present at both CMP and CKP Sensors. Turn the ignition off. Using a 12-volt test light connected to 12 Volts, probe the Sensor Ground circuit in the Camshaft Position Sensor harness connector. Repeat the above test at the Crankshaft Position Sensor (Crankshaft Position Sensor harness connector measure). 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 Replace both the Camshaft Position Sensor and Crankshaft Position Sensor in accordance with the Service Information. NOTE: A battery disconnect must be performed to clear the Cam Crank Synchronization Events. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST - NGC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc). No Repair the Ground Circuit(s) as necessary. NOTE: A battery disconnect must be performed to clear the Cam Crank Synchronization Events. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST - NGC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc).
22. POWERTRAIN CONTROL MODULE (PCM) Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Camshaft Position 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. NOTE: A battery disconnect must be performed to clear the Cam Crank Synchronization Events. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST - NGC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc). No Replace and program the Powertrain Control Module (PCM) in accordance with the Service Information. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST - NGC»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc).

See also:
• POWERTRAIN VERIFICATION TEST - NGC
• TUBE(S), FUEL , DESCRIPTION
• CONVERTER, CATALYTIC , INSPECTION
• DIAGNOSIS AND TESTING
• DIAGNOSTIC CODE INDEX - NGC
• STANDARD PROCEDURE
• DIAGNOSIS AND TESTING
• DIAGNOSIS AND TESTING