3.6l & 5.7l - Dtcs p0591 to p1628 Jeep Grand Cherokee WK2

P0591-SPEED CONTROL SWITCH 2 PERFORMANCE

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

THEORY OF OPERATION

The Speed Control Switch is hardwired to the Steering Column Control Module (SCCM). The SCCM is located near the top of the steering column below the steering wheel. The SCCM includes the steering column shroud, the Steering Angle Sensor (SAS), the Clockspring, the Multi-function Switch, a Steering Column Power Tilt and Telescope Switch (if equipped), and a trim cover. The speed control messages are bussed to the Powertrain Control Module (PCM) via the Can Bus.

WHEN MONITORED

Continuously with the ignition on.

SET CONDITION

The Steering Column Control Module (SCCM) has detected that a non-permissable combination has occurred in the Speed Control Switch.

POSSIBLE CAUSES

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

DIAGNOSTIC TEST

1. CHECK FOR AN ACTIVE DTC WARNING: Turn the ignition off disconnect the 12-volt battery and wait two minutes before proceeding. Failure to follow these instructions may result in possible serious or fatal injury. WARNING: Do not place an intact non-deployed airbag face down on a hard surface, the airbag propels into the air if accidentally deployed. Failure to follow these instructions may result in possible serious or fatal injury. Turn the ignition on. With the scan tool, read DTCs Does the scan tool display this DTC as active? Yes NOTE: Visually and physically inspect the wiring harness between the Speed Control Switch harness connector and the SCCM harness connector. Repair any damaged wires, connectors, and open/spread terminals. If harness is OK, proceed with test. Replace the Steering Column Control Module (SCCM) in accordance with the Service Information. Refer to «MODULE, STEERING COLUMN, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/communication-devices/#electronic-control-modules-service-information) . Perform the PCM VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) . No Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to «INTERMITTENT CONDITION»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .

P0592-SPEED CONTROL SWITCH 2 CIRCUIT LOW

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

The Speed Control Switch is hardwired to the Steering Column Control Module (SCCM). The SCCM is located near the top of the steering column below the steering wheel. The SCCM includes the steering column shroud, the Steering Angle Sensor (SAS), the Clockspring, the Multi-function Switch, a Steering Column Power Tilt and Telescope Switch (if equipped), and a trim cover. The speed control messages are bussed to the Powertrain Control Module (PCM) via the Can Bus.

Continuously with the ignition on.

Fault signifies when the switch voltage is shorted low.

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

1. CHECK FOR AN ACTIVE DTC WARNING: Turn the ignition off disconnect the 12-volt battery and wait two minutes before proceeding. Failure to follow these instructions may result in possible serious or fatal injury. WARNING: Do not place an intact non-deployed airbag face down on a hard surface, the airbag propels into the air if accidentally deployed. Failure to follow these instructions may result in possible serious or fatal injury. Turn the ignition on. With the scan tool, read DTCs. Does the scan tool display this DTC as active? Yes NOTE: Visually and physically inspect the wiring harness between the Speed Control Switch harness connector and the SCCM harness connector. Repair any damaged wires, connectors, and open/spread terminals. If harness is OK, proceed with test. Replace the Speed Control Switch in accordance with the Service Information. Refer to «SWITCH, SPEED CONTROL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/cruise-control-systems/#speed-control-service-information__removal) . Perform the PCM VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) . No Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to «INTERMITTENT CONDITION»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .

P0593-SPEED CONTROL SWITCH 2 CIRCUIT HIGH

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

The Speed Control Switch is hardwired to the Steering Column Control Module (SCCM). The SCCM is located near the top of the steering column below the steering wheel. The SCCM includes the steering column shroud, the Steering Angle Sensor (SAS), the Clockspring, the Multi-function Switch, a Steering Column Power Tilt and Telescope Switch (if equipped), and a trim cover. The speed control messages are bussed to the Powertrain Control Module (PCM) via the Can Bus.

Continuously with the ignition on.

Fault signifies when the switch voltage is shorted high.

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

1. CHECK FOR AN ACTIVE DTC WARNING: Turn the ignition off disconnect the 12-volt battery and wait two minutes before proceeding. Failure to follow these instructions may result in possible serious or fatal injury. WARNING: Do not place an intact non-deployed airbag face down on a hard surface, the airbag propels into the air if accidentally deployed. Failure to follow these instructions may result in possible serious or fatal injury. Turn the ignition on. With the scan tool, read DTCs Does the scan tool display this DTC as active? Yes NOTE: Visually and physically inspect the wiring harness between the Speed Control Switch harness connector and the SCCM harness connector. Repair any damaged wires, connectors, and open/spread terminals. If harness is OK, proceed with test. Replace the Speed Control Switch in accordance with the Service Information. Refer to «SWITCH, SPEED CONTROL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/cruise-control-systems/#speed-control-service-information__removal) . Perform the PCM VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) . No Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to «INTERMITTENT CONDITION»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .

P0600-SERIAL COMMUNICATION LINK

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

With the ignition on.

Internal Bus communication failure between processors. One Trip Fault. Three good trips to clear.

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

1. POWERTRAIN CONTROL MODULE (PCM) NOTE: Diagnose any CMP or CKP Sensor faults before continuing. Check for intermittent loose CMP or CKP connections. The Powertrain Control Module is reporting internal errors, view repair to continue. Repair 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 POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .

P0601-INTERNAL MEMORY CHECKSUM INVALID

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

With the ignition on.

Internal checksum for software failed, does not match calculated value. One trip fault, three good trips to clear.

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

1. POWERTRAIN CONTROL MODULE (PCM) NOTE: Diagnose any CMP or CKP Sensor faults before continuing. Check for intermittent loose CMP or CKP connections. The Powertrain Control Module is reporting internal errors, view repair to continue. Repair 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 POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .

P0606-INTERNAL ECM PROCESSOR

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

Engine running.

When the Powertrain Control Module (PCM) recognizes an internal failure to communicate with the ECM or the CMP and CKP Sensor count periods are too short. One trip fault. ETC light is flashing.

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

1. POWERTRAIN CONTROL MODULE (PCM) NOTE: Diagnose any CMP or CKP Sensor faults before continuing. Check for intermittent loose CMP or CKP connections. The Powertrain Control Module is reporting internal errors, view repair to continue. Repair 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 POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .

P060B-ETC A/D GROUND PERFORMANCE

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

Theory of operation

The Electronic Throttle Control (ETC) motor is controlled by the Powertrain Control Module (PCM). The DC motor located in the throttle body drives the throttle blade. In order to decrease idle speed, along with spark and fuel delivery changes the PCM commands the throttle closed reducing air flow into the engine and the idle speed decreases. In order to increase idle speed, the PCM commands the throttle plate open allowing more air to pass the throttle plate.

When the Throttle Motor is powered.

When A2D reading does not return to ground within a set period of time of test activation, this fault sets. The test typically runs a couple of times per second and is the reason why APP2 signal spikes to ground a couple of times per second in normal running. Reprogramming the module may not always fix this fault. One trip fault. ETC lamp is illuminated.

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

1. PROGRAM THE POWERTRAIN CONTROL MODULE Verify the PCM is at the latest calibration (flash level). NOTE: An intermittent loss of power to the PCM without performing an ETC Relearn procedure may cause this DTC to set. NOTE: Diagnose any other DTCs that may have set with the P060B. Refer to «PCM/ECM REPROGRAMMING - GAS»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) . Program the PCM in accordance with the Service Information and follow the PCM/ECM PROGRAMMING procedure. . Start the engine. Allow the engine to reach normal operating temperature. Operate the accelerator pedal. (do not exceed 3500 RPM) With the scan tool, select View DTCs. Does this DTC reset by itself? Yes Replace and reprogram 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 POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/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.

P060D-ETC LEVEL 2 APP PERFORMANCE

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

Theory of operation

The Electronic Throttle Control (ETC) motor is controlled by the Powertrain Control Module (PCM). The DC motor located in the throttle body drives the throttle blade. In order to decrease idle speed, along with spark and fuel delivery changes the PCM commands the throttle closed reducing air flow into the engine and the idle speed decreases. In order to increase idle speed, the PCM commands the throttle plate open allowing more air to pass the throttle plate.

Throttle motor is powered and no matured faults related to APP Sensors.

When secondary software determines that APPS 1 and APPS 2 signals do not match for a period of time. One trip fault. ETC lamp will flash

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

1. PROGRAM THE POWERTRAIN CONTROL MODULE Verify the PCM is at the latest calibration (flash level). NOTE: An intermittent loss of power to the PCM without performing an ETC Relearn procedure may cause this DTC to set. Refer to «PCM/ECM REPROGRAMMING - GAS»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) . Program the PCM in accordance with the Service Information and follow the PCM/ECM PROGRAMMING procedure. . Start the engine. Allow the engine to reach normal operating temperature. Operate the accelerator pedal. (do not exceed 3500 RPM) With a scan tool, select View DTCs. NOTE: Diagnose any other DTCs that may have set with the P060D. Does this DTC reset by itself? Yes Replace and reprogram 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 POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/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.

P060E-ETC LEVEL 2 TPS PERFORMANCE

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

Theory of operation

The Electronic Throttle Control (ETC) motor is controlled by the Powertrain Control Module (PCM). The DC motor located in the throttle body drives the throttle blade. In order to decrease idle speed, along with spark and fuel delivery changes the PCM commands the throttle closed reducing air flow into the engine and the idle speed decreases. In order to increase idle speed, the PCM commands the throttle plate open allowing more air to pass the throttle plate.

Throttle motor is powered and no matured faults related to TP Sensors.

When secondary software determines that TPS 1 and TPS 2 signals do not match for a period of time. One trip fault. ETC lamp will flash.

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

1. PROGRAM THE POWERTRAIN CONTROL MODULE Verify the PCM is at the latest calibration (flash level). NOTE: An intermittent loss of power to the PCM without performing an ETC Relearn procedure may cause this DTC to set. Refer to «PCM/ECM REPROGRAMMING - GAS»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) . Program the PCM in accordance with the Service Information and follow the PCM/ECM PROGRAMMING procedure. . Start the engine. Allow the engine to reach normal operating temperature. Operate the accelerator pedal. (do not exceed 3500 RPM). With the scan tool, select View DTCs. NOTE: Diagnose any other DTCs that may have set with the P060E. Does this DTC reset by itself? Yes Replace and reprogram 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 POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/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.

P060F-ETC LEVEL 2 ECT PERFORMANCE

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

Theory of operation

The Electronic Throttle Control (ETC) motor is controlled by the Powertrain Control Module (PCM). The DC motor located in the throttle body drives the throttle blade. In order to decrease idle speed, along with spark and fuel delivery changes the PCM commands the throttle closed reducing air flow into the engine and the idle speed decreases. In order to increase idle speed, the PCM commands the throttle plate open allowing more air to pass the throttle plate.

Throttle motor is powered and no matured faults related to the Engine Coolant Temp Sensor.

When secondary software determines that the Coolant Temperature is implausible for a period of time. One trip fault. ETC lamp will flash.

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

1. PROGRAM THE POWERTRAIN CONTROL MODULE NOTE: Diagnose any Engine Coolant Temperature Sensor DTCs before continuing. Verify the PCM is at the latest calibration (flash level). NOTE: An intermittent loss of power to the PCM without performing an ETC Relearn procedure may cause this DTC to set. Refer to «PCM/ECM REPROGRAMMING - GAS»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) . Program the PCM in accordance with the Service Information and follow the PCM/ECM PROGRAMMING procedure. . Start the engine. Allow the engine to reach normal operating temperature. Operate the accelerator pedal. (do not exceed 3500 RPM). With the scan tool, select View DTCs. NOTE: Diagnose any other DTCs that may have set with the P060F. Does this DTC reset by itself? Yes Replace and reprogram 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 POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/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.

P061A-ETC LEVEL 2 TORQUE PERFORMANCE

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

Theory of operation

The Electronic Throttle Control (ETC) motor is controlled by the Powertrain Control Module (PCM). The DC motor located in the throttle body drives the throttle blade. In order to decrease idle speed, along with spark and fuel delivery changes the PCM commands the throttle closed reducing air flow into the engine and the idle speed decreases. In order to increase idle speed, the PCM commands the throttle plate open allowing more air to pass the throttle plate.

Throttle motor is powered.

When secondary software determines that the customer requested output is not being achieved by the engine for a period of time. One trip fault. ETC lamp will flash.

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

1. PROGRAM THE POWERTRAIN CONTROL MODULE NOTE: Check the engine for air/vacuum leaks and diagnose any Fuel System Lean/Rich as well as MAP Sensor DTCs before continuing. Verify the PCM is at the latest calibration (flash level). NOTE: An intermittent loss of power to the PCM without performing an ETC Relearn procedure may cause this DTC to set. Refer to «PCM/ECM REPROGRAMMING - GAS»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) . Program the PCM in accordance with the Service Information and follow the PCM/ECM PROGRAMMING procedure. . Start the engine. Allow the engine to reach normal operating temperature. Operate the accelerator pedal. (do not exceed 3500 RPM) With the scan tool, select View DTCs. NOTE: Diagnose any other DTCs that may have set with the P061A. Does this DTC reset by itself? Yes Replace and reprogram 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 POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/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.

P061C-ETC LEVEL 2 RPM PERFORMANCE

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

Theory of operation

The Electronic Throttle Control (ETC) motor is controlled by the Powertrain Control Module (PCM). The DC motor located in the throttle body drives the throttle blade. In order to decrease idle speed, along with spark and fuel delivery changes the PCM commands the throttle closed reducing air flow into the engine and the idle speed decreases. In order to increase idle speed, the PCM commands the throttle plate open allowing more air to pass the throttle plate.

Throttle motor is powered and no camshaft or crankshaft electrical signal related DTCs are set.

When secondary software determines that the engine speed is implausible for a period of time. One trip fault. ETC lamp will flash.

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

1. PROGRAM THE POWERTRAIN CONTROL MODULE NOTE: Diagnose any Camshaft Position and Crankshaft Position Sensor DTCs before continuing. Verify the PCM is at the latest calibration (flash level). NOTE: An intermittent loss of power to the PCM without performing an ETC Relearn procedure may cause this DTC to set. Refer to «PCM/ECM REPROGRAMMING - GAS»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) . Program the PCM in accordance with the Service Information and follow the PCM/ECM PROGRAMMING procedure. . Start the engine. Allow the engine to reach normal operating temperature. Operate the accelerator pedal. (do not exceed 3500 RPM) With the scan tool, select View DTCs. NOTE: Diagnose any other DTCs that may have set with the P061C. Does this DTC reset by itself? Yes Replace and reprogram 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 POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/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.

Scheme 295

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

The Powertrain Control module (PCM) uses the generator field duty cycle signal circuit or F-terminal circuit, to monitor the duty cycle of the generator. The generator field duty cycle signal circuit connects to high side of the field windings in the generator. A Pulse Width Modulated (PWM) high side driver in the voltage regulator turns the field windings ON and OFF. The PCM uses the PWM signal input to determine the generator load on the engine. This allows the PCM to adjust the idle speed to compensate for high electrical loads. The PCM monitors the status of the generator field duty cycle signal circuit. When the key is in the RUN position and the engine is OFF, the PCM should detect a duty cycle near 0 percent. However, when the engine is running, the duty cycle should be between 5-95 percent.

With the ignition on. Engine running.

When the Powertrain Control Module (PCM) tries to regulate the generator field with no result during monitoring. One Trip Fault. Three good trips to turn off the MIL.

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

Scheme 296

Scheme 297

Scheme 298

Scheme 299

1. ACTIVE DIAGNOSTIC TROUBLE CODE (DTC) Start the engine and allow it to reach 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. Increase engine speed by pressing the accelerator pedal. Do not exceed 3500 RPM. Using the scan tool, read the active DTCs. Is the DTC Active at this time? Yes Go To 2 . No Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to «INTERMITTENT CONDITION»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .
2. GENERATOR OPERATION Turn the ignition off. Disconnect the Generator harness connector. Using a 12-volt test light connected to ground, probe the (K125) Generator Field Control circuit in the Generator Field harness connector. Ignition on, engine not running. NOTE: The DTC needs to be cleared before actuating the Solenoid, if the DTC is not cleared, the Solenoid may not be allowed to actuate. With the scan tool, actuate the Generator Field Driver. NOTE: The test light should be illuminated and bright proportional to the maximum duty cycle allowed by the scan tool. For example, if the scan tool allows 100% actuation, the brightness should be as bright as a direct connection to the battery. If the scan tool allows a maximum 25% actuation, the brightness should be 25% as bright as a direct connection to the battery. Does the test light illuminate brightly and flash on and off? Yes Verify that there is good pin to terminal contact in the Generator and Powertrain Control Module connectors. If OK, replace the Generator. Refer to «GENERATOR, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/charging-system/#charging-service-information) . Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/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. (K125) GEN FIELD CIRCUIT SHORTED TO VOLTAGE Turn the ignition off. Disconnect the C2 PCM harness connector. Ignition on, engine not running. Measure the voltage on the (K125) Gen Field Control circuit in the Generator Field harness connector. Is there any voltage present? Yes Repair the short to voltage in the (K125) Gen Field Control circuit. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/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. (K125) GEN FIELD CIRCUIT OPEN 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. Measure the resistance of the (K125) Gen Field Control circuit from the Generator Field harness connector to appropriate terminal of the PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position). Is the resistance below 5.0 Ohms? Yes Go To 5 . No Repair the open in the (K125) Gen Field Control circuit. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .
5. (K125) GEN FIELD CIRCUIT SHORTED TO GROUND Measure the resistance between ground and the (K125) Gen Field Control circuit in the Generator Field harness connector. Is the resistance below 100 Ohms? Yes Repair the short to ground in the (K125) Gen Field Control circuit. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/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. POWERTRAIN CONTROL MODULE (PCM) Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Generator 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 Generator 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»(/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. Refer to «MODULE, POWERTRAIN CONTROL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/communication-devices/#electronic-control-modules-service-information) . Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .

Scheme 300

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

The Fuel Pump control is requested by the Powertrain Control Module (PCM) along the Fuel Pump control relay circuit. The Totally Integrated Power Module (TIPM) monitors the sense voltage on the Fuel Pump relay circuit, when PCM pulls the circuit low the TIPM engages the Fuel Pump. If the sense voltage is open or pulled low the PCM will set the P0627-FUEL PUMP RELAY CIRCUIT DTC.

With the engine running and the battery voltage greater than 10.4 Volts.

The Powertrain Control Module (PCM) detects that the actual state of the fuel pump control does not match the intended state.

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

Scheme 301

Scheme 302

Scheme 303

1. DTC IS ACTIVE NOTE: If there are any ASD/Main Relay or system voltage DTCs present, diagnose those DTCs before proceeding with this test procedure. Ignition on, engine not running. With the scan tool, select View DTCs. Copy DTC and Freeze Frame information and clear DTCs. NOTE: Active or pending DTCs may not allow Fuel Pump actuation, ensure all DTCs are cleared before proceeding with this test procedure. With the scan tool, actuate the Fuel Pump. 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 CONDITION diagnostic procedure. Refer to «INTERMITTENT CONDITION»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .
2. (K31) FUEL PUMP RELAY CIRCUIT SHORTED TO GROUND Turn the ignition off. Disconnect the C1 Totally Integrated Power Module (TIPM) harness connector. Disconnect the C3 Powertrain Control Module (PCM) harness connector. Measure the resistance between ground and the (K31) Fuel Pump Control circuit in the C1 Totally Integrated Power Module (TIPM) harness connector. Is the resistance below 100 Ohms? Yes Repair the short to ground in the (K31) Fuel Pump Control circuit. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/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. (K31) FUEL PUMP RELAY 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 the diagnostics. Measure the resistance of the (K31) Fuel Pump Control circuit between the Totally Integrated Power Module (TIPM) 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 4 . No Repair the open or high resistance in the (K31) Fuel Pump Control circuit. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .
4. TOTALLY INTEGRATED POWER MODULE (TIPM) ACTUATION Connect the C1 Totally Integrated Power Module (TIPM) connector. Turn the ignition on. 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 the diagnostics. Using a 12-volt test light connected to ground, probe the (K31) Fuel Pump Control circuit at the appropriate terminal of PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position). 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 brightly? Yes Go To 6 . No Go To 5 .
5. TOTALLY INTEGRATED POWER MODULE (TIPM) Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Totally Integrated Power Module (TIPM) 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 connectors. Perform 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»(/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 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) .
6. POWERTRAIN CONTROL MODULE (PCM) Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Totally Integrated Power Module (TIPM) 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 connectors. Perform 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»(/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. Refer to «MODULE, POWERTRAIN CONTROL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/communication-devices/#electronic-control-modules-service-information) . Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .

P062C-ETC LEVEL 2 MPH PERFORMANCE

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

Theory of operation

The Electronic Throttle Control (ETC) motor is controlled by the Powertrain Control Module (PCM). The DC motor located in the throttle body drives the throttle blade. In order to decrease idle speed, along with spark and fuel delivery changes the PCM commands the throttle closed reducing air flow into the engine and the idle speed decreases. In order to increase idle speed, the PCM commands the throttle plate open allowing more air to pass the throttle plate.

Throttle motor is powered and no vehicle speed related DTCs have matured.

When secondary software determines that the vehicle speed is implausible for a period of time. One trip fault. ETC lamp will flash.

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

1. PROGRAM THE POWERTRAIN CONTROL MODULE Verify the PCM is at the latest calibration (flash level). NOTE: An intermittent loss of power to the PCM without performing an ETC Relearn procedure may cause this DTC to set. Refer to «PCM/ECM REPROGRAMMING - GAS»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) . Program the PCM in accordance with the Service Information and follow the PCM/ECM PROGRAMMING procedure. . Start the engine. Allow the engine to reach normal operating temperature. Operate the accelerator pedal. (do not exceed 3500 RPM) With the scan tool, select View DTCs. NOTE: Diagnose any other DTCs that may have set with the P062C. Does this DTC reset by itself? Yes Replace and reprogram 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 POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/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.

P0630-VIN NOT PROGRAMMED IN PCM

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

At initialization.

The VIN has not been programmed into the PCM. One Trip Fault. Three good trips to turn off the MIL.

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

1. PROGRAMMING VIN INTO THE PCM Ignition on, engine not running. Using the scan tool, program VIN into the PCM. Start the engine. NOTE: If the engine will not start, crank the engine over for 15 seconds. Crank at least two times with the ignition switch returning to the off position each time. Allow the engine to reach normal operating temperature. With the scan tool, select View DTCs. Does the DTC reset? 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 POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) . No The VIN has been successfully programmed into the PCM. Test is complete. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .

P0632-ODOMETER NOT PROGRAMMED IN PCM

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

Ignition on.

Odometer is not programed into the Powertrain Control Module (PCM). One Trip Fault. Three good trips to turn off the MIL.

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

1. PROGRAMMING MILEAGE INTO THE PCM Ignition on, engine not running. With the scan tool, erase DTCs. Using a scan tool, program the mileage into the PCM. Start the engine. Allow the engine to reach normal operating temperature. With the scan tool, select View DTCs. Does the DTC reset? 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 POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) . No The mileage has been successfully programmed into the PCM. Test is complete. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .

P0633-SKIM SECRET KEY NOT STORED IN PCM

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

Ignition on.

The Secret Key information has not been programmed into the Powertrain Control Module (PCM). One Trip Fault. Three good trips to turn off the MIL.

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

1. PROGRAMMING SECRET KEY INTO THE PCM Ignition on, engine not running. With the scan tool, erase DTCs. Using the scan tool, program the Secret Key information into the PCM using the MODULE PROGRAMMING procedure. Refer to «STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/communication-devices/#electronic-control-modules-service-information__standard-procedure) . Start the engine. NOTE: If the engine will not start, crank the engine over for 15 seconds. Crank at least 2 times with the ignition switch returning to the off position each time. Allow the engine to reach normal operating temperature. With the scan tool, select View DTCs. Does the DTC reset? 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 POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) . No The Secret Key information has been successfully programmed into the PCM. Test is complete. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .

Scheme 304

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

The engine running. The engine speed greater than 1157 RPM.

The Powertrain Control Module (PCM) recognizes the alternator output voltage is less than the Battery feed circuit voltage. One trip failure. The Generator light will illuminate. The fault will be checked again on the next key cycle.

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

Scheme 305

Scheme 306

Scheme 307

1. ACTIVE DIAGNOSTIC TROUBLE CODE (DTC) NOTE: Inspect the vehicle for aftermarket accessories that may exceed the Generator System output. NOTE: The battery must be fully charged. NOTE: The Generator belt tension and condition must be checked before continuing. Ignition on, engine not running. Start the engine. Allow the idle to stabilize. Using the scan tool, read the active DTCs. Is the DTC Active at this time? Yes Go To 2 . No Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to «INTERMITTENT CONDITION»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .
2. EXCESSIVE RESISTANCE IN THE (A803) GENERATOR SENSE CIRCUIT Turn the ignition off. Disconnect the Generator harness connector. 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. Measure the resistance of the (A803) Generator Sense circuit from the Generator harness connector to the appropriate terminal of PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position). Is the resistance below 5.0 Ohms? Yes Go To 3 . No Repair the excessive resistance in the (A803) Generator Sense circuit. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .
3. (A803) GENERATOR SENSE CIRCUIT SHORTED TO GROUND Measure the resistance between ground and the (A803) Generator Sense circuit at the Generator harness connector. Is the resistance below 100 Ohms? Yes Repair the short to ground in the (A803) Generator Sense circuit. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/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. GENERATOR OPERATION Connect the C1 PCM harness connector. Ignition on, engine not running. NOTE: The DTC needs to be cleared before actuating the Solenoid, if the DTC is not cleared, the Solenoid may not be allowed to actuate. Using a 12-volt test light connected to ground, probe the (K20) Generator Field Control circuit in the Generator Field harness connector. With a scan tool, actuate the Generator Field Driver. NOTE: The test light should be illuminated and bright proportional to the maximum duty cycle allowed by the scan tool. For example, if the scan tool allows 100% actuation, the brightness should be as bright as a direct connection to the battery. If the scan tool allows a maximum 25% actuation, the brightness should be 25% as bright as a direct connection to the battery. Does the test light illuminate brightly and flash on and off? Yes Verify that there is good pin to terminal contact in the Generator and Powertrain Control Module connectors. If OK, replace the Generator. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/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. POWERTRAIN CONTROL MODULE (PCM) Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Generator 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 Generator 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»(/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»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .

Scheme 308

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

Ignition on.

When the Powertrain Control Module (PCM) recognizes the Primary 5-Volt Supply circuit voltage is too low. One Trip Fault. ETC light is flashing.

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

Scheme 309

Scheme 310

1. ACTIVE DIAGNOSTIC TROUBLE CODE (DTC) NOTE: Improperly installed aftermarket accessories can cause this DTC to set. Check for any improperly installed aftermarket accessories before continuing with this test. Start the engine and allow it to idle for at least 60 seconds. 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, read the active DTCs. Is the DTC Active at this time? Yes Go To 2 . No Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to «INTERMITTENT CONDITION»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .
2. (F855) PRIMARY 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND Turn the ignition off. Disconnect the C2 PCM harness connector. Disconnect all the Sensor harness connectors that share the (F855) Primary 5-Volt Supply circuit. Measure the resistance between ground and the (F855) Primary 5-Volt Supply circuit in the CKP Sensor harness connector. Is the resistance below 100 Ohms? Yes Repair the short to ground in the (F855) Primary 5-Volt Supply circuit. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/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. 5-VOLT SENSOR Turn the ignition off. Reconnect all the previously disconnected Sensors except for the CKP Sensor harness connector. Ignition on, engine not running. Measure the voltage on the (F855) Primary 5-Volt Supply circuit in the CKP Sensor harness connector. Is the voltage below 4.5 Volts? Yes Go To 4 . No Verify that there is good pin to terminal contact in the CKP Sensor and Powertrain Control Module connectors. If OK, replace the Crankshaft Position Sensor. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .
4. 5-VOLT SENSOR SHORTED TO GROUND Measure the voltage on the (F855) Primary 5-Volt Supply circuit at the CKP Sensor harness connector. NOTE: You must Turn the Ignition OFF when disconnecting any of the Sensor harness connectors and Turn the Ignition On to check the voltage readings. While monitoring the voltage, disconnect each Sensor harness connector that shares the (F855) Primary 5-Volt Supply circuit, one at a time. NOTE: Reconnect all the Sensors and clear all trouble codes before continuing. Does the voltage increase above 4.5 Volts when disconnecting any of the remaining Sensors? Yes Replace the Sensor that causes the (F855) Primary 5-Volt Supply circuit voltage to increase when disconnected. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/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. 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»(/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»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .

P0643-PRIMARY 5-VOLT SUPPLY CIRCUIT HIGH

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

Ignition on.

When the Powertrain Control Module (PCM) recognizes the Primary 5-Volt Supply circuit voltage is too high. One Trip Fault. ETC light is flashing.

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

1. ACTIVE DIAGNOSTIC TROUBLE CODE (DTC) NOTE: Improperly installed aftermarket accessories can cause this DTC to set. Check for any improperly installed aftermarket accessories before continuing with this test. Start the engine and allow it to idle for at least 60 seconds. 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, read the active DTCs. Is the DTC Active at this time? Yes Go To 2 . No Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to «INTERMITTENT CONDITION»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .
2. (F855) PRIMARY 5-VOLT SUPPLY SHORTED TO VOLTAGE Turn the ignition off. Disconnect the C2 PCM harness connector. Disconnect all the Sensor harness connectors that share the (F855) Primary 5-Volt Supply circuit. NOTE: Improperly installed aftermarket accessories can cause this DTC to set. Check for wiring added by customer. Ignition on, engine not running. Measure the voltage on the (F855) Primary 5-Volt Supply circuit at the CKP Sensor harness connector. Is there any voltage present? Yes Repair the short to voltage in the (F855) Primary 5-Volt Supply circuit. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/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. 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»(/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»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .

P0645-A/C CLUTCH RELAY CIRCUIT

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

The A/C clutch control is requested by the Powertrain Control Module (PCM) along the A/C clutch control relay circuit. The Totally Integrated Power Module (TIPM) monitors the sense voltage on the A/C clutch relay circuit, when PCM pulls the circuit low the TIPM engages the A/C clutch. If the sense voltage is missing or pulled low the PCM will set the P0645-A/C CLUTCH RELAY CIRCUIT DTC.

With the ignition on. Battery voltage greater than 10 Volts. A/C is being requested.

An open or shorted condition is detected in the A/C Clutch Relay control circuit. One Trip Fault. Three good trips to turn off the MIL.

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

Scheme 311

Scheme 312

Scheme 313

1. DTC IS ACTIVE NOTE: If there are any ASD/Main Relay or system voltage DTCs present, diagnose those DTCs before proceeding with this test procedure. Ignition on, engine not running. With the scan tool, select View DTCs. Copy DTC and Freeze Frame information and clear DTCs. NOTE: Active or pending DTCs may not allow A/C clutch actuation, make sure all DTCs are cleared before proceeding with this test procedure. With the scan tool, actuate the A/C Compressor. 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 CONDITION diagnostic procedure. Refer to «INTERMITTENT CONDITION»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .
2. (C13) A/C CLUTCH CONTROL CIRCUIT SHORTED TO GROUND Turn the ignition off. Disconnect the C1 Totally Integrated Power Module (TIPM) harness connector. Disconnect the C3 Powertrain Control Module (PCM) harness connector. Measure the resistance between ground and the (C13) A/C Clutch Control circuit in the C1 Totally Integrated Power Module (TIPM) harness connector. Is the resistance below 100 Ohms? Yes Repair the short to ground in the (C13) A/C Clutch Control circuit. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/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. (C13) A/C CLUTCH CONTROL 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 the diagnostics. Measure the resistance of the (C13) A/C Clutch Control circuit between the Totally Integrated Power Module (TIPM) 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 4 . No Repair the open or high resistance in the (C13) A/C Clutch Control circuit. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .
4. TOTALLY INTEGRATED POWER MODULE (TIPM) ACTUATION Connect the C1 Totally Integrated Power Module (TIPM) harness connector. Turn the ignition on. 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 the diagnostics. Using a 12-volt test light connected to ground, probe the (C13) A/C Clutch Control circuit at the appropriate terminal of PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position). 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 brightly? Yes Go To 6 . No Go To 5 .
5. TOTALLY INTEGRATED POWER MODULE (TIPM) Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Totally Integrated Power Module (TIPM) 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 connectors. Perform 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»(/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 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) .
6. POWERTRAIN CONTROL MODULE (PCM) Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Totally Integrated Power Module (TIPM) 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 connectors. Perform 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»(/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. Refer to «MODULE, POWERTRAIN CONTROL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/communication-devices/#electronic-control-modules-service-information) . Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .

Scheme 314

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

Ignition on.

When the Powertrain Control Module (PCM) recognizes the Auxiliary 5-Volt Supply circuit voltage is too low. One Trip Fault. ETC light is flashing.

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

Scheme 315

Scheme 316

1. ACTIVE DIAGNOSTIC TROUBLE CODE (DTC) NOTE: Improperly installed aftermarket accessories can cause this DTC to set. Check for any improperly installed aftermarket accessories before continuing with this test. Start the engine and allow it to idle for at least 60 seconds. 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, read the active DTCs. Is the DTC Active at this time? Yes Go To 2 . No Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to «INTERMITTENT CONDITION»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .
2. (F856) AUXILIARY 5-VOLT SUPPLY SHORTED TO GROUND Turn the ignition off. Disconnect the C1 PCM harness connector. Disconnect all the Sensors that share the (F856) Auxiliary 5-Volt Supply circuit. Measure the resistance between ground and the (F856) Auxiliary 5-Volt Supply circuit in the CMP Sensor harness connector. Is the resistance below 100 Ohms? Yes Repair the short to ground in the (F856) Auxiliary 5-Volt Supply circuit. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/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. CMP SENSOR Turn the ignition off. Reconnect all the previously disconnected Sensors except for the CMP Sensor harness connector. Ignition on, engine not running. Measure the voltage on the (F856) Auxiliary 5-Volt Supply circuit in the CMP Sensor harness connector. Is the voltage below 4.5 Volts? Yes Go To 4 . No Verify that there is good pin to terminal contact in the CMP Sensor and Powertrain Control Module connectors. If OK, replace the Camshaft Position Sensor. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .
4. 5-VOLT SENSOR SHORTED TO GROUND Measure the voltage on the (F856) Auxiliary 5-Volt Supply circuit at the CMP Sensor harness connector. NOTE: You must Turn the Ignition OFF when disconnecting any of the Sensor harness connectors and Turn the Ignition On to check the voltage readings. While monitoring the voltage, disconnect each Sensor harness connector that shares the (F856) Auxiliary 5-Volt Supply circuit, one at a time. Does the voltage increase above 4.5 Volts when disconnecting any of the Sensor harness connectors? Yes Verify that there is good pin to terminal contact in the related Sensor and Powertrain Control Module connectors. If OK, replace the Sensor that causes the (F856) Auxiliary 5-Volt Supply circuit voltage to increase when disconnected. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/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. 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»(/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»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .

P0653-SENSOR REFERENCE VOLTAGE 2 CIRCUIT HIGH

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

Ignition on.

When the Powertrain Control Module (PCM) recognizes the Auxiliary 5-Volt Supply circuit voltage is too high. One Trip Fault. ETC light is flashing.

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

1. ACTIVE DIAGNOSTIC TROUBLE CODE (DTC) NOTE: Improperly installed aftermarket accessories can cause this DTC to set. Check for any improperly installed aftermarket accessories before continuing with this test. Start the engine and allow it to idle for at least 60 seconds. 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, read the active DTCs. Is the DTC Active at this time? Yes Go To 2 . No Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to «INTERMITTENT CONDITION»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .
2. (F856) AUXILIARY 5-VOLT SUPPLY SHORTED TO VOLTAGE Turn the ignition off. Disconnect the C1 PCM harness connector. Disconnect all the Sensors that share the (F856) Auxiliary 5-Volt Supply circuit. NOTE: Improperly installed aftermarket accessories can cause this DTC to set. Check for wiring added by customer. Ignition on, engine not running. Measure the voltage on the (F856) Auxiliary 5-Volt Supply circuit at the CMP Sensor harness connector. Is there any voltage present? Yes Repair the short to voltage in the (F856) Auxiliary 5-Volt Supply circuit. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/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. 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»(/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»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .

Scheme 317

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

For information regarding ASD relay description and operation. Refer to RELAY, AUTO SHUT DOWN, DESCRIPTION .

For specific relay location and type. Refer to FUSE LOCATIONS AND TYPES, SPECIFICATIONS .

With ignition on. Battery voltage above 10 Volts.

The actual ASD state is not equal to the desired ASD state. One Trip Fault. Three good trips to turn off the MIL.

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

Scheme 318

Scheme 319

Scheme 320

1. ASD RELAY OPERATION Ignition on, engine not running. With the scan tool, select View DTCs. Is the DTC Active at this time? Yes Go To 2 . No Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to «INTERMITTENT CONDITION»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .
2. (A209) FUSED B+ CIRCUITS Turn the ignition off. Remove the ASD Relay from the TIPM. Refer to «RELAY, AUTO SHUT DOWN, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/ignition-system/#ignition-system-service-information) . Using a 12-volt test light connected to ground, probe the (A209) Fused B+ circuits in the TIPM. 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 Go To 3 . No Repair the open or short to ground in the (A209) Fused B+ circuits. Inspect and replace any open fuses. Refer to «FUSE LOCATIONS AND TYPES, SPECIFICATIONS»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuses-circuit-breakers/#vehicle-quick-reference) . Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .
3. ASD RELAY Measure the resistance of the ASD Relay Coil. Is the resistance between 60 to 80 Ohms? Yes Go To 4 . No Replace the ASD Relay. Refer to «RELAY, AUTO SHUT DOWN, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/ignition-system/#ignition-system-service-information) . Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .
4. (K51) ASD RELAY CONTROL CIRCUIT OPEN Disconnect the C3 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. Measure the resistance of the (K51) ASD Relay Control circuit from the TIPM to the appropriate terminals of PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position). Is the resistance below 5.0 Ohms? Yes Go To 5 . No Repair the open in the (K51) ASD Relay Control circuit. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .
5. (K51) ASD RELAY CONTROL CIRCUIT SHORTED TO GROUND Measure the resistance between ground and the (K51) ASD Relay Control circuit in the TIPM. Is the resistance below 100 Ohms? Yes Repair the short to ground in the (K51) ASD Relay Control circuit. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/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. POWERTRAIN CONTROL MODULE (PCM) Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the ASD Relay 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 ASD Relay 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»(/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. Refer to «MODULE, POWERTRAIN CONTROL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/communication-devices/#electronic-control-modules-service-information) . Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .

P0688-AUTO SHUTDOWN RELAY SENSE CIRCUIT LOW

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

For information for ASD relay description and operation. Refer to RELAY, AUTO SHUT DOWN, DESCRIPTION .

For specific relay location and type. Refer to FUSE LOCATIONS AND TYPES, SPECIFICATIONS .

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

No voltage sensed at the PCM when the ASD relay is energized. One Trip Fault. Three good trips to turn off the MIL.

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

Scheme 321

1. VERIFY ASD DTC NOTE: If any O2 SENSOR HEATER CIRCUIT HIGH DTCs set along with P0688-AUTO SHUTDOWN RELAY SENSE CIRCUIT LOW, all of the O2 Sensor Heater Control circuits need to be checked for a short to battery voltage. NOTE: If any of the following component DTCs have set along with P0688, diagnose them first before continuing. Ignition Coil(s) Fuel Injector(s) ASD Control ASD Control Output (TIPM DTC) With the scan tool, erase the DTC. Attempt to start the engine. If the engine will not start, crank the engine for at least 15 seconds. It may be necessary to repeat several times. Does the DTC reset? Yes Go To 2 . No Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to «INTERMITTENT CONDITION»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .
2. ENGINE OPERATION Attempt to start the engine. Does the engine start? Yes Go To 3 . No Go To 4 .
3. (F342) ASD RELAY OUTPUT CIRCUIT OPEN Turn the ignition off. Remove the ASD Relay. Refer to «RELAY, AUTO SHUT DOWN, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/ignition-system/#ignition-system-service-information) . Disconnect the C1 and C3 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. Measure the resistance of the (F342) ASD Relay Output circuit from the Relay connection to the appropriate terminals of PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position). Is the resistance below 5.0 Ohms? Yes Go To 7 . No Repair the open in the (F342) ASD Relay Output circuits. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .
4. ASD RELAY Turn the ignition off. Install a substitute relay in place of the ASD Relay. Refer to «RELAY, AUTO SHUT DOWN, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/ignition-system/#ignition-system-service-information) . Ignition on, engine not running. With the scan tool, erase DTCs. Attempt to start the engine. With the scan tool, select View DTCs. Does the DTC reset? Yes Go To 5 . No Replace the ASD Relay. Refer to «RELAY, AUTO SHUT DOWN, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/ignition-system/#ignition-system-service-information) . Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .
5. (A209) FUSED B+ CIRCUITS Turn the ignition off. Using a 12-volt test light connected to ground, probe the (A209) Fused B+ circuits at the Relay connection. 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 Go To 6 . No Repair the open or short to ground in the (A209) Fused B+ circuits. Inspect the related fuse and repair as necessary. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .
6. (F342) ASD RELAY OUTPUT CIRCUIT OPEN Disconnect the C1 and C3 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. Measure the resistance of the (F342) ASD Relay Output circuit from the Relay connection to the appropriate terminals of PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position). Is the resistance below 5.0 Ohms? Yes Go To 7 . No Repair the open in the (F342) ASD Relay Output circuit. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .
7. POWERTRAIN CONTROL MODULE (PCM) Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the ASD Relay 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 ASD Relay 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»(/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. Refer to «MODULE, POWERTRAIN CONTROL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/communication-devices/#electronic-control-modules-service-information) . Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .

Scheme 322

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

The engine oil pump features seven vanes and a moving element that continuously adjusts to maintain a regulated oil pressure supply by varying the displacement of the pump. The pump has two regulated pressure stages of operation controlled by an on/off solenoid. Low pressure mode regulation (solenoid on) is approximately 200 kPa (29 psi) and high pressure mode regulation (solenoid off) is approximately 450 kPa (65 psi). The Powertrain Control Module (PCM) switches the pump between stages based on engine operating conditions, oil and coolant temperatures, speed and load. Under most typical conditions, the pump will run in low mode from idle up to around 3000 RPM and switch from low to high mode between 3000 and 4000 RPM. The maximum oil pressure in the engine is limited to 1000 kPa (145 psi) by the relief valve. Pressure in the main oil gallery of the engine can be monitored with diagnostic equipment through the oil pressure sensor mounted on the rear of the oil filter module. The minimum pressure for the engine is 41 kPa (6 psi) at any operating condition. Anything under this pressure could result in damage to critical moving parts.

With the battery voltage is between 11 and 18 Volts with the engine running.

The Powertrain Control Module (PCM) detects that the actual voltage of the oil pump solenoid control circuit does not match the intended state. One Trip Fault. Three good trips to turn off the MIL.

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

Scheme 323

Scheme 324

Scheme 325

Scheme 326

Scheme 327

1. DTC IS ACTIVE Ignition on, engine not running. With the scan tool, record the related Freeze Fame Data and clear the DTCs in the Powertrain Control Module (PCM). Start the engine and allow it to reach normal operating temperature. Hold engine speed greater than 1, 000 RPM for at least one minute. The DTC will not be set unless cam phasing becomes active, which may not occur if speed never leaves idle. 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 can result possible serious or fatal injury. With the scan tool, select View DTCs. Is the DTC Active or Pending at this time? Yes Go To 2 . No Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to «INTERMITTENT CONDITION»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .
2. (G62) OIL PUMP CONTROL CIRCUIT SHORTED TO VOLTAGE Turn the ignition off. Disconnect the Oil Pump Solenoid harness connector. Disconnect the Powertrain Control Module (PCM) C2 harness connector. Turn the ignition on. Measure the voltage on the (G62) Oil Pump Control circuit at the Oil Pump Solenoid harness connector. Is the voltage greater than 1.0 volt? Yes Repair the short to voltage in the (G62) Oil Pump Control circuit. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/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. EXCESSIVE RESISTANCE IN THE (G62) OIL PUMP CONTROL CIRCUIT 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. Measure the resistance of the (G62) Oil Pump Control circuit between the Oil Pump Solenoid harness connector and the appropriate terminal of the PCM Pinout Box. Is the resistance below 5.0 Ohms? Yes Go To 4 . No Repair the excessive resistance in the (G62) Oil Pump Control circuit. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .
4. (G62) OIL PUMP CONTROL CIRCUIT SHORTED TO GROUND Measure the resistance between ground and the (G62) Oil Pump Control circuit at the Oil Pump Solenoid harness connector. Is the resistance greater than 20k Ohms? Yes Go To 5 . No Repair the short to ground in the (G62) Oil Pump Control circuit. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .
5. OIL PUMP SOLENOID Connect the Powertrain Control Module (PCM) C2 harness connector. Turn the ignition on. Using a 12-volt test light connected to 12 Volts probe the (G62) Oil Pump Control circuit in the Oil Pump Solenoid harness connector. NOTE: The test light should be off unless you have a short to ground, except for a brief period immediately after turning ignition on. With the scan tool, actuate the Oil Pump Solenoid control to the ON (100%) position. 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 during the actuation and was it off when required? Yes Verify that there is good pin to terminal contact in the Oil Pump Solenoid and Powertrain Control Module connectors. If OK, replace the Oil Pump Solenoid in accordance with the Service Information. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/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. EXCESSIVE RESISTANCE OR OPEN IN THE (Z903) OIL PUMP SOLENOID GROUND CIRCUIT Turn the ignition off. Measure the resistance between ground and the (Z903) Oil Pump Solenoid ground circuit at the Oil Pump Solenoid harness connector. Is the resistance below 5.0 Ohms? Yes Go To 7 . No Repair the excessive resistance in the (Z903) Oil Pump Solenoid ground control circuit. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .
7. POWERTRAIN CONTROL MODULE (PCM) Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the oil pump 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. Verify that there is good pin to terminal contact in the oil pump solenoid and Powertrain Control Module harness connectors. Perform 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»(/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. Refer to «MODULE, POWERTRAIN CONTROL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/communication-devices/#electronic-control-modules-service-information) . Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .

P06DD-DUAL STAGE OIL PUMP STUCK LOW

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

The engine oil pump features seven vanes and a moving element that continuously adjusts to maintain a regulated oil pressure supply by varying the displacement of the pump. The pump has two regulated pressure stages of operation controlled by an on/off solenoid. Low pressure mode regulation (solenoid on) is approximately 200 kPa (29 psi) and high pressure mode regulation (solenoid off) is approximately 450 kPa (65 psi). The Powertrain Control Module (PCM) switches the pump between stages based on engine operating conditions, oil and coolant temperatures, speed and load. Under most typical conditions, the pump will run in low mode from idle up to around 3000 RPM and switch from low to high mode between 3000 and 4000 RPM. The maximum oil pressure in the engine is limited to 1000 kPa (145 psi) by the relief valve. Pressure in the main oil gallery of the engine can be monitored with diagnostic equipment through the oil pressure sensor mounted on the rear of the oil filter module. The minimum pressure for the engine is 41 kPa (6 psi) at any operating condition. Anything under this pressure could result in damage to critical moving parts.

Based upon Engine oil temperature, the monitor runs when engine speed (RPM) is over a calibrated value. The cooler the engine oil, the lower is the enable engine speed (Minimum 1000 RPM). To evaluate the dual stage oil pump, fully warm up the engine. To run DUAL STAGE OIL PUMP STUCK LOW (P06DD), drive vehicle with engine speed over 3500 RPM.

The Powertrain Control Module (PCM) senses the oil pressure is less than a low threshold for five (5) seconds. One Trip fault.

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

1. ACTIVE DIAGNOSTIC TROUBLE CODE (DTC) NOTE: Make sure that the engine oil is at the proper level. Also, review the customers oil change history to make sure that the oil is being changed at the correct intervals and that the proper oil viscosity is being used. 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. Using the scan tool, read the active DTCs. Is the DTC Active at this time? Yes Go To 2 . No Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to «INTERMITTENT CONDITION»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .
2. ENGINE OIL/ENGINE MECHANICAL Turn the ignition off. The following items should be considered before determining the cause of this DTC: ENGINE MECHANICAL TOLERANCES OUT OF SPECIFICATION ENGINE OIL PRESSURE OUT OF SPECIFICATION LOW ENGINE OIL DETERIORATED OR DIRTY OIL ENGINE OIL CONTAMINATED (i.e., coolant and/or fuel) NOTE: Failure to do so may lead to misdiagnosis. If any of the above conditions are found, repair as necessary. Were any of the above conditions present? Yes Repair as necessary. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/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. DUAL STAGE OIL PUMP NOTE: The 3.6L Oil pump is released as an assembly. The assembly includes both the pump and the solenoid. There are no serviceable sub-assembly components. In the event the oil pump or solenoid are not functioning or out of specification they must be replaced as an assembly. Replace the Oil Pressure Sensor accordance with the Service Information. Turn the ignition on. Using the scan tool, erase the DTCs. Start the engine and allow it to reach normal operating temperature. Drive the vehicle get the engine within the set conditions. Using the scan tool, read the active DTCs. Did the DTC return? Yes Replace the oil pump in accordance with the Service Information. Refer to «PICK-UP, OIL PUMP, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) . Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/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 complete. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .

P06DE-DUAL STAGE OIL PUMP STUCK HIGH

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

The engine oil pump features seven vanes and a moving element that continuously adjusts to maintain a regulated oil pressure supply by varying the displacement of the pump. The pump has two regulated pressure stages of operation controlled by an on/off solenoid. Low pressure mode regulation (solenoid on) is approximately 200 kPa (29 psi) and high pressure mode regulation (solenoid off) is approximately 450 kPa (65 psi). The Powertrain Control Module (PCM) switches the pump between stages based on engine operating conditions, oil and coolant temperatures, speed and load. Under most typical conditions, the pump will run in low mode from idle up to around 3000 RPM and switch from low to high mode between 3000 and 4000 RPM. The maximum oil pressure in the engine is limited to 1000 kPa (145 psi) by the relief valve. Pressure in the main oil gallery of the engine can be monitored with diagnostic equipment through the oil pressure sensor mounted on the rear of the oil filter module. The minimum pressure for the engine is 41 kPa (6 psi) at any operating condition. Anything under this pressure could result in damage to critical moving parts.

Based upon Engine oil temperature, the monitor runs when engine speed (RPM) is over a calibrated value. The cooler the engine oil, the lower is the enable engine speed (Minimum 1000 RPM). To evaluate dual stage oil pump, fully warm up the engine. To run DUAL STAGE OIL PUMP STUCK HIGH (P06DE), drive vehicle over 2500 RPM.

The Powertrain Control Module (PCM) senses the oil pressure is more than a high threshold for 50 seconds. One Trip fault.

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

1. ACTIVE DIAGNOSTIC TROUBLE CODE (DTC) NOTE: Make sure that the engine oil is at the proper level. Also, review the customers oil change history to ensure that the oil is being changed at the correct intervals and that the proper oil viscosity is being used. 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. Using the scan tool, read the active DTCs. Is the DTC Active at this time? Yes Go To 2 . No Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to «INTERMITTENT CONDITION»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .
2. ENGINE OIL/ENGINE MECHANICAL Turn the ignition off. The following items should be considered before determining the cause of this DTC: ENGINE MECHANICAL TOLERANCES OUT OF SPECIFICATION ENGINE OIL PRESSURE OUT OF SPECIFICATION LOW ENGINE OIL DETERIORATED OR DIRTY OIL ENGINE OIL CONTAMINATED (i.e., coolant and/or fuel) NOTE: Failure to do so may lead to misdiagnosis. If any of the above conditions are found, repair as necessary Were any of the above conditions present? Yes Repair as necessary. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/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. DUAL STAGE OIL PUMP NOTE: The 3.6L Oil pump is released as an assembly. The assembly includes both the pump and the solenoid. There are no serviceable sub-assembly components. In the event the oil pump or solenoid are not functioning or out of specification they must be replaced as an assembly. Replace the Oil Pressure Sensor accordance with the Service Information. Turn the ignition on. Using the scan tool, erase the DTCs. Start the engine and allow it to reach normal operating temperature. Drive the vehicle get the engine within the set conditions. Using the scan tool, read the active DTCs. Did the DTC return? Yes Replace the oil pump in accordance with the Service Information. Refer to «PICK-UP, OIL PUMP, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) . Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/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 complete. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .

Scheme 328

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

for further information. Refer to SWITCH, STOP LAMP, DESCRIPTION .

Ignition on.

When the Powertrain Control Module (PCM) recognizes Brake Switch No. 2 voltage is not equal to the applied value at the PCM when Brake Switch No. 1 is applied. This could be a normal condition. If this condition is seen repeatedly by the PCM the fault is set. Cruise will not work for the rest of the key cycle.

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

Scheme 329

Scheme 330

Scheme 331

Scheme 332

Scheme 333

1. ACTIVE DTC NOTE: Make sure the Stop Lamp Switch is adjusted properly before continuing. NOTE: Make sure the Stop Lamp Switch is properly wired, such as (B15) Brake Switch No. 1 and (B16) Brake Switch No. 2 Signal circuit are not switched at the harness connector. Ignition on, engine not running. With the scan tool, select View DTCs. Is the DTC Active at this time? Yes Go To 2 . No Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to «INTERMITTENT CONDITION»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .
2. (F941) FUSED IGNITION SWITCH CIRCUIT Turn the ignition off. Disconnect the Stop Lamp Switch harness connector. Using a 12-volt test light connected to ground, probe the (F941) Fused Ignition Switch Output circuit in the Stop Lamp Switch harness connector. Does the test light illuminate brightly? Yes Go To 3 . No Repair the open or short to ground in the (F941) Fused Ignition Switch Output circuit. Inspect the related fuse and repair as necessary. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .
3. STOP LAMP SWITCH Turn the ignition off. Measure the resistance between the (F941) Fused Ignition Switch Output circuit terminal and the (B16) Brake Switch No. 2 Signal circuit terminal in the Stop Lamp Switch. Measure the resistance between the (Z916) Ground circuit terminal and the (B15) Brake Switch No. 1 Signal terminal in the Stop Lamp Switch. Apply and release the Stop Lamp Switch while monitoring the ohmmeter. Does the resistance change from below 5.0 Ohms to open circuit for each circuit check? Yes Go To 4 . No Verify that there is good pin to terminal contact in the Switch and Powertrain Control Module connectors. If OK, replace the Stop Lamp Switch. Refer to «SWITCH, STOP LAMP, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/exterior-lights/#lampslighting-exterior-service-information) . Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .
4. (B16) BRAKE SWITCH NO. 2 SIGNAL CIRCUIT SHORTED TO VOLTAGE Disconnect the C3 PCM harness connector. Measure the voltage on the (B16) Brake Switch No. 2 Signal circuit in the Stop Lamp Switch harness connector. Ignition on, engine not running. Is there any voltage present? Yes Repair the short to voltage in the (B16) Brake Switch No. 2 Signal circuit. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/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. (B16) BRAKE SWITCH NO. 2 SIGNAL CIRCUIT OPEN Turn the ignition off. Measure the resistance of the (B16) Brake Switch No. 2 Signal circuit from the Stop Lamp Switch harness connector to the appropriate terminal of PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position). Is the resistance below 5.0 Ohms? Yes Go To 6 . No Repair the open in the (B16) Brake Switch No. 2 Signal circuit. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .
6. (B16) BRAKE SWITCH NO. 2 SIGNAL CIRCUIT SHORTED TO GROUND Measure the resistance between ground and the (B16) Brake Switch No. 2 Signal circuit in the Stop Lamp Switch harness connector. Is the resistance below 5.0 Ohms? Yes Repair the short to ground in the (B16) Brake Switch No. 2 Signal circuit. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/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. (B15) BRAKE SWITCH NO. 1 SIGNAL CIRCUIT OPEN Measure the resistance of the (B15) Brake Switch No. 1 Signal circuit from the Stop Lamp Switch harness connector to the appropriate terminal of PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position). Is the resistance below 5.0 Ohms? Yes Go To 8 . No Repair the open in the (B15) Brake Switch No. 1 Signal circuit. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .
8. POWERTRAIN CONTROL MODULE (PCM) Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Stop Lamp Switch 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 Switch 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»(/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. Refer to «MODULE, POWERTRAIN CONTROL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/communication-devices/#electronic-control-modules-service-information) . Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .

P0850-PARK/NEUTRAL SWITCH PERFORMANCE

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

The Park Neutral switch rationality test is enabled only for vehicles equipped with a 4/5 speed automatic transmission. This diagnostic checks if the park/neutral switch is incorrectly stuck in the neutral position during driving conditions by comparing Vehicle Speed, Engine Speed, Throttle Position and Pressure Ratio to the fail thresholds and by looking at the state of the Park/Neutral Switch. The stuck in drive condition is not explicitly checked as the starter relay does not energize and therefore render the vehicle inoperable.

Continuously with the transmission in Park, Neutral or Drive and NOT in Limp-in mode.

This code will set if the PCM detects an incorrect Park/Neutral switch state for a given mode of vehicle operation. Two trip fault. Three good trips to turn off the MIL.

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

1. ACTIVE DTC NOTE: Check the TCM for DTCs, if P0706 is set in the TCM diagnose the TCM code before continuing. Ignition on, engine not running. While moving the gear selector through all gear positions (Park to 1 and back to Park). Using a scan tool, select View DTCs. Is the DTC Active at this time? Yes Go To 2 . No Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to «INTERMITTENT CONDITION»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .
2. TRS (T41) SENSE (P/N SENSE) CIRCUIT OPEN Turn the ignition off. Disconnect the C3 PCM harness connector. Disconnect the Transmission Range Sensor 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. Measure the resistance of the TRS (T41) Sense (P/N Sense) circuit from the TRS harness connector to the appropriate terminal of PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position). Is the resistance below 5.0 Ohms? Yes Go To 3 . No Repair the open in the TRS (T41) Sense (P/N Sense) circuit. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .
3. TRS (T41) SIGNAL CIRCUIT SHORTED TO GROUND Measure the resistance between ground and the TRS (T41) Sense (P/N Sense) circuit at the TRS harness connector. Is the resistance above 100k Ohms? Yes Go To 4 . No Repair the short to ground in the TRS (T41) Sense (P/N Sense) circuit. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/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 Measure the resistance between ground and the (T41) TRS Sense (P/N Sense) circuit while moving the gear selector through each gear in the TRS connector. NOTE: The circuit is grounded in Park and Neutral and open in the other positions. Did the resistance change from above 100k Ohms (open) to below 10.0 Ohms (grounded)? Yes Go To 5 . No Verify that there is good pin to terminal contact in the TRS and Powertrain Control Module connectors. Replace the Transmission Range Sensor. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .
5. POWERTRAIN CONTROL MODULE (PCM) Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Transmission Range 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. Verify that there is good pin to terminal contact in the TRS 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»(/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. Refer to «MODULE, POWERTRAIN CONTROL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/communication-devices/#electronic-control-modules-service-information) . Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .

Scheme 334

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

The General Temperature Rationality looks at the outputs of the three temperature sensors and compare them under cold start conditions. Following a start to run delay time, the outputs of the ambient, engine coolant and intake air temperature sensors will be compared. If two sensors agree but not the third, the third sensor is declared as irrational. If all three sensors are irrational the General Temperature Sensor Rationality is failed.

Engine off time is greater than 480 minutes and the vehicle has been driven for one minute over 35 mph. Ambient temperature is greater than -64° C (-83° F).

Once the vehicle is soaked for a calibrated engine off time and then driven over calibrated speed and load conditions for some calibrated time, the PCM compares the ambient air, engine coolant and intake air temperature sensor values. If the values of all the three sensors disagree with one another, a general temperature sensor irrationality is declared. Two Trip Fault. Three good trips to turn off the MIL.

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

Scheme 335

Scheme 336

Scheme 337

Scheme 338

Scheme 339

Scheme 340

Scheme 341

Scheme 342

Scheme 343

Scheme 344

Scheme 345

Scheme 346

Scheme 347

Scheme 348

Scheme 349

Scheme 350

Scheme 351

Scheme 352

1. ACTIVE DTC Turn the ignition off. If possible, allow the vehicle to sit with the ignition off for more than 480 minutes in an environment where the temperature is consistent and above -7° C (19.4° F). Test drive the vehicle. The vehicle must exceed 48 km/h (30 mph) during the test drive. Do not cycle the ignition off when the test drive is completed. With the scan tool, select View the DTCs. NOTE: All ECT, Intake Air and Ambient Air Temperature Sensor codes must be diagnosed and repaired before continuing. NOTE: In cold weather, this DTC could be set by a high powered block heater and no repair would be required. Is the DTC Active or Pending at this time? Yes Go To 2 . No Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to «INTERMITTENT CONDITION»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .
2. TEMPERATURE SENSOR CIRCUIT With the scan tool, read the ECT, Ambient Air Temp and Intake Air Temp Sensor temp values. Start the engine. Allow the engine to reach normal operating temperature while monitoring the three Sensor temperature values. Is the temperature for each of the Sensors increasing properly? Yes Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to «INTERMITTENT CONDITION»(/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. TEMPERATURE SENSOR Disconnect the suspected sensor. Ignition on, engine not running. With the scan tool, read the voltage of the suspected Sensor. Connect a jumper wire between the Sensor Signal circuit and the Sensor ground circuit. Did the voltage reading start at 4.8 to 5.0 Volts and decrease to 0 Volts when the jumper wire was installed? Yes Verify that there is good pin to terminal contact in the Sensor and Control Module connectors. If OK, replace the appropriate Temperature Sensor. Refer to «SENSOR, COOLANT TEMPERATURE, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/accessory-drive-belts/#engine-cooling-system) . Refer to «SENSOR, AIR TEMPERATURE, INTAKE, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/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 . NOTE: Remove the jumper wire before continuing.
4. EXCESSIVE RESISTANCE IN THE TEMPERATURE SENSOR SIGNAL CIRCUIT Turn the ignition off. Disconnect the C2 PCM harness connector. Disconnect the C4 TIPM 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. Measure the resistance of the Sensor Signal circuit from the Sensor harness connector to the appropriate terminal of PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position) for the ECT Sensor and IAT Sensor. Measure the resistance of the (G31) AAT Sensor Signal circuit from the Sensor harness connector to the C4 TIPM harness connector. Is the resistance above 5.0 Ohms? Yes Repair the excessive resistance in the Temperature Sensor Signal circuit. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/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. EXCESSIVE RESISTANCE IN THE SENSOR GROUND CIRCUIT Measure the resistance of the (K900) Sensor ground circuit from the ECT Sensor and IAT Sensor to the appropriate terminal of PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position). Measure the resistance of the (G931) Sensor ground circuit from the AAT Sensor harness connector to the C4 TIPM harness connector. Is the resistance above 5.0 Ohms? Yes Repair the excessive resistance in the Sensor ground circuit. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/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 .
6. SENSOR SIGNAL CIRCUIT SHORTED TO GROUND Measure the resistance between ground and the Sensor Signal circuit at the Sensor harness connector. Is the resistance below 100 Ohms? Yes Repair the short to ground in the Sensor Signal circuit. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/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. SENSOR SIGNAL CIRCUIT SHORTED TO THE SENSOR GROUND CIRCUIT Measure the resistance between ground and the Sensor Signal circuit at the Sensor harness connector. Is the resistance below 100 Ohms? Yes Repair the short between the Sensor ground circuit and the Sensor Signal circuit. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/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. SENSOR SIGNAL CIRCUIT SHORTED TO VOLTAGE Turn the ignition on. Measure the voltage on the Sensor Signal circuit at the Sensor harness connector. Is there any voltage present? Yes Repair the short to voltage in the Sensor Signal circuit. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/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) Turn the ignition off. 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»(/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. Refer to «MODULE, POWERTRAIN CONTROL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/communication-devices/#electronic-control-modules-service-information) . Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .

Scheme 353

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

Engine running in closed loop mode.

Enable conditions are met and the 02 sensor has not been in closed loop control at least once on each of the two consecutive trips, the MIL illuminates and the DTC is set. Two Trip Fault. Three good trips to turn off the MIL

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

Scheme 354

Scheme 355

1. ACTIVE DIAGNOSTIC TROUBLE CODE (DTC) Diagnose all other DTCs before continuing. Start the engine. Allow the engine to reach normal operating temperature. With the scan tool, read DTCs. NOTE: It may be necessary to drive the vehicle to meet the conditions to set this DTC, try to repeat the conditions in which the fault originally set by reviewing the Freeze Frame data. Is the DTC Active or Pending at this time? Yes Go To 2 . No Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to «INTERMITTENT CONDITION»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .
2. 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 Fuel Pressure Decay Tester (special tool #8978A, Decay Tool, Fuel) to the fuel rail. Ignition on, engine not running. With the scan tool, actuate the Fuel System test and observe the fuel pressure gauge. NOTE: Fuel pressure specification: 5.7L is 407 kPa +/- 34 kPa (59 psi +/- 5 psi), 3.6L is 400 kPa +/- 14 kPa (58 psi +/- 2 psi). Turn the ignition off. Choose a conclusion that best matches your fuel pressure reading. Within Specification Go To 3 . Above Specification Replace the fuel filter/pressure regulator. Refer to «MODULE, FUEL PUMP, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) . Below Specification Go To 12 . CAUTION: Stop All Actuations.
3. O2 SENSOR OPERATION Start the engine. Allow the engine to reach normal operating temperature. NOTE: If one of the O2 Sensor's Signal or Return circuit is shorted to ground the scan tool will display all O2 Sensor voltage readings low. The O2 Sensor that is shorted to ground will display a voltage reading near or at 0 Volts. NOTE: If one of the O2 Sensor Signal or Return circuits are shorted to voltage, the scan tool will display all O2 Sensor voltage readings high. NOTE: After the repairs have been made, verify proper O2 Sensor operation. If all the O2 Sensor voltage readings have not returned to normal, follow the diagnostic procedure for the remaining O2 Sensors. With the scan tool, monitor all of the O2 Sensor voltage readings. Is the voltage switching between 2.5 and 3.4 Volts for all the O2 Sensors? Yes Go To 4 . No Go To 8 .
4. 1/1 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. Ignition on, engine not running. With the scan tool, actuate the 1/1 O2 Heater Test. Using the scan tool, monitor 1/1 O2 Sensor voltage for at least two minutes. Does the voltage stay above 4.5 Volts? Yes Verify that there is good pin to terminal contact in the 1/1 O2 Sensor and Powertrain Control Module connectors. If OK, replace the 1/1 O2 Sensor. Refer to «SENSOR, OXYGEN, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/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. MAP SENSOR OPERATION Turn the ignition off. Connect a Vacuum Gauge to a Manifold Vacuum source. Start the engine. Allow the engine to idle. NOTE: If engine will not idle, maintain a constant RPM above idle. Using the scan tool, read the MAP Sensor vacuum value. Is the scan tool reading within 1" of Hg on the Vacuum Gauge reading? Yes Go To 6 . No Verify that there is good pin to terminal contact in the MAP Sensor and Powertrain Control Module connectors. If OK, replace the MAP Sensor. Refer to «SENSOR, MANIFOLD AIR PRESSURE (MAP), REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .
6. ECT SENSOR OPERATION NOTE: For this test to be valid, the thermostat must be operating correctly. NOTE: This test works best if performed on a cold engine (cold soak) Ignition on, engine not running. With the scan tool, read the Engine Coolant Temperature (ECT) Sensor value. If the engine was allowed to sit overnight (cold soak), the temperature value should be a sensible value that is somewhere close to the ambient temperature. NOTE: If engine coolant temperature is above 82° C (180° F), allow the engine to cool until 65° C (150° F) is reached. Start the Engine. During engine warm-up, monitor the ECT Sensor value. The temperature value change should be a smooth transition from start up to normal operating temperature 82° C (180° F). The value should reach at least 82° C (180° F). Did the ECT value increase smoothly and did it reach at least 82° C (180° F)? Yes Go To 7 . No Verify that there is good pin to terminal contact in the ECT Sensor and Powertrain Control Module connectors. If OK, replace the Engine Coolant Temperature Sensor. Refer to «SENSOR, COOLANT TEMPERATURE, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/accessory-drive-belts/#engine-cooling-system) . Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .
7. ENGINE MECHANICAL PROBLEM Turn the ignition off. Check for any of the following conditions/mechanical problems: AIR INDUCTION SYSTEM - must be free from leaks. ENGINE VACUUM - must be at least 13 inches in neutral ENGINE VALVE TIMING - must be within specifications ENGINE COMPRESSION - must be within specifications ENGINE EXHAUST SYSTEM - must be free of any restrictions or leaks. ENGINE PCV SYSTEM - must flow freely TORQUE CONVERTER STALL SPEED - must be within specifications POWER BRAKE BOOSTER - no internal vacuum leaks FUEL - must be free of contamination FUEL INJECTOR - plugged or restricted injector; control wire not connected to correct injector Are there any engine mechanical problems? Yes Repair as necessary. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/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 11 .
8. 1/1 O2 SENSOR Ignition on, engine not running. Disconnect the 1/1 O2 Sensor harness connector. With the scan tool, monitor the 1/1 O2 Sensor voltage. O2 Sensor voltage should read between 4.1 and 5.0 Volts on the scan tool with the connector disconnected. Connect a jumper wire between the (K41) Signal circuit and the (K902) O2 Return Upstream circuit in the O2 Sensor harness connector. NOTE: The voltage should drop from between 4.1 and 5.0 Volts to 2.5 Volts with the jumper wire in place. Did the O2 Sensor voltage change from between 4.1 and 5.0 Volts to 2.5 Volts with the jumper wire installed? Yes Verify that there is good pin to terminal contact in the O2 Sensor and Powertrain Control Module connectors. If OK, replace the O2 Sensor. Refer to «SENSOR, OXYGEN, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/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 . NOTE: Remove the jumper wire before continuing.
9. (K41) O2 SENSOR 1/1 SIGNAL CIRCUIT With the scan tool, monitor the 1/1 O2 Sensor voltage reading with the jumper wire removed. NOTE: The scan tool will display all O2 Sensor voltage readings approximately 5.0 Volts when only one O2 Sensor's Signal circuit is shorted to voltage. NOTE: The scan tool will display one O2 Sensor voltage close to zero and the others will read lower than normal when one O2 Sensor Signal circuit contains excessive resistance. Is the voltage between 4.1 and 5.0 Volts? Yes Go To 10 . No Check the (K41) O2 Sensor 1/1 Signal circuit for a short to ground, open or short to voltage. Inspect the O2 Sensor connector and the PCM harness connector. If OK, 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 POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .
10. (K902) O2 RETURN UPSTREAM CIRCUIT Measure the voltage on the (K902) O2 Return Upstream circuit in the O2 Sensor harness connector. Is the voltage at 2.5 Volts? Yes Go To 11 . No Check the O2 Return Upstream circuit for a short to ground, open or short to voltage. Inspect the O2 Sensor connector and the PCM harness connector. If OK, replace and program the Powertrain Control Module in accordance with the Service Information. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .
11. 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»(/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. Refer to «MODULE, POWERTRAIN CONTROL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/communication-devices/#electronic-control-modules-service-information) . Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .
12. 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. Raise vehicle on hoist and disconnect the fuel pressure line at the fuel pump module. Install 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: 5.7L is 407 kPa +/- 34 kPa (59 psi +/- 5 psi), 3.6L is 400 kPa +/- 14 kPa (58 psi +/- 2 psi). Is the fuel pressure within specification? Yes Repair or replace fuel supply line as necessary. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/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 13 . CAUTION: Stop All Actuations.
13. FUEL PUMP 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. 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. Refer to «MODULE, FUEL PUMP, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/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 14 .
14. FUEL PUMP MODULE Repair Verify that there is good pin to terminal contact in the Fuel Pump Module, Relay and Powertrain Control Module connectors. If OK, replace the Fuel Pump Module. Refer to «MODULE, FUEL PUMP, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .

Scheme 356

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

Engine running in closed loop mode.

Enable conditions are met and the O2 sensor has not been in closed loop control at least once on each of the two consecutive trips, the MIL illuminates and the DTC is set. Two Trip Fault. Three good trips to turn off the MIL

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

1. ACTIVE DIAGNOSTIC TROUBLE CODE (DTC) Diagnose all other DTCs before continuing. NOTE: Check for contaminants that may have damaged an O2 Sensor: contaminated fuel, unapproved silicone, oil and coolant. Start the engine. Allow the engine to reach normal operating temperature. With the scan tool, read DTCs. NOTE: It may be necessary to drive the vehicle to meet the conditions to set this DTC, try to repeat the conditions in which the fault originally set by reviewing the Freeze Frame data. Is the DTC Active or Pending at this time? Yes Go To 2 . No Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to «INTERMITTENT CONDITION»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .
2. 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 Fuel Pressure Decay Tester (special tool #8978A, Decay Tool, Fuel) to the fuel rail. Ignition on, engine not running. Using the scan tool, actuate the ASD Fuel System test and observe the fuel pressure gauge. NOTE: Fuel pressure specification: 5.7L is 407 kPa +/- 34 kPa (59 psi +/- 5 psi), 3.6L is 400 kPa +/- 14 kPa (58 psi +/- 2 psi). Turn the ignition off. Choose a conclusion that best matches your fuel pressure reading. Within Specification Go To 3 . Above Specification Replace the fuel filter/pressure regulator. Refer to «MODULE, FUEL PUMP, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) . Below Specification Go To 12 . CAUTION: Stop All Actuations.
3. O2 SENSOR OPERATION Start the engine. Allow the engine to reach normal operating temperature. NOTE: If one of the O2 Sensor's Signal or Return circuit is shorted to ground the scan tool will display all O2 Sensor voltage readings low. The O2 Sensor that is shorted to ground will display a voltage reading near or at 0 Volts. NOTE: If one of the O2 Sensor Signal or Return circuits are shorted to voltage, the scan tool will display all O2 Sensor voltage readings high. NOTE: After the repairs have been made, verify proper O2 Sensor operation. If all the O2 Sensor voltage readings have not returned to normal, follow the diagnostic procedure for the remaining O2 Sensors. Using the scan tool, monitor the 2/1 O2 Sensor voltage reading. Is the voltage switching between 2.5 and 3.4 Volts? Yes Go To 4 . No Go To 8 .
4. 2/1 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. NOTE: Perform the following test on all O2 Sensors. Ignition on, engine not running. With the scan tool, actuate the 2/1 O2 Heater Test. Using the scan tool, monitor 2/1 O2 Sensor voltage for at least two minutes. Does the voltage stay above 4.5 Volts? Yes Verify that there is good pin to terminal contact in the 2/1 O2 Sensor and Powertrain Control Module connectors. If OK, replace the 2/1 O2 Sensor. Refer to «SENSOR, OXYGEN, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/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. MAP SENSOR OPERATION Turn the ignition off. Connect a Vacuum Gauge to a Manifold Vacuum source. Start the engine. Allow the engine to idle. NOTE: If engine will not idle, maintain a constant RPM above idle. Using the scan tool, read the MAP Sensor vacuum value. Is the scan tool reading within 1 inch of Hg on the Vacuum Gauge reading? Yes Go To 6 . No Verify that there is good pin to terminal contact in the MAP Sensor and Powertrain Control Module connectors. If OK, replace the MAP Sensor. Refer to «SENSOR, MANIFOLD AIR PRESSURE (MAP), REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .
6. ECT SENSOR OPERATION NOTE: For this test to be valid, the thermostat must be operating correctly. NOTE: This test works best if performed on a cold engine (cold soak). Ignition on, engine not running. Using the scan tool, read the Engine Coolant Temperature (ECT) Sensor value. If the engine was allowed to sit overnight (cold soak), the temperature value should be a sensible value that is somewhere close to the ambient temperature. NOTE: If engine coolant temperature is above 82° C (180° F), allow the engine to cool until 65° C (150° F) is reached. Start the Engine. During engine warm-up, monitor the ECT Sensor value. The temperature value change should be a smooth transition from start up to normal operating temperature 82° C (180° F). The value should reach at least 82° C (180° F). Did the ECT value increase smoothly and did it reach at least 82° C (180° F)? Yes Go To 7 . No Verify that there is good pin to terminal contact in the ECT Sensor and Powertrain Control Module connectors. If OK, replace the Engine Coolant Temperature Sensor. Refer to «SENSOR, COOLANT TEMPERATURE, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/accessory-drive-belts/#engine-cooling-system) . Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .
7. ENGINE MECHANICAL PROBLEM Turn the ignition off. Check for any of the following conditions/mechanical problems: AIR INDUCTION SYSTEM - must be free from leaks. ENGINE VACUUM - must be at least 13 inches in neutral ENGINE VALVE TIMING - must be within specifications ENGINE COMPRESSION - must be within specifications ENGINE EXHAUST SYSTEM - must be free of any restrictions or leaks ENGINE PCV SYSTEM - must flow freely TORQUE CONVERTER STALL SPEED - must be within specifications POWER BRAKE BOOSTER - no internal vacuum leaks FUEL - must be free of contamination FUEL INJECTOR - plugged or restricted injector; control wire not connected to correct injector Are there any engine mechanical problems? Yes Repair as necessary. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/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 11 .
8. O2 SENSOR Ignition on, engine not running. Disconnect the 2/1 O2 Sensor harness connector. Using the scan tool, monitor the 2/1 O2 Sensor voltage. O2 Sensor voltage should read between 4.1 and 5.0 Volts on the scan tool with the connector disconnected. Connect a jumper wire between the (K43) O2 Sensor 2/1 Signal circuit and the (K902) O2 Return Upstream circuit in the O2 Sensor harness connector. NOTE: The voltage should drop from between 4.1 and 5.0 Volts to 2.5 Volts with the jumper wire in place. Did the O2 Sensor voltage change from between 4.1 and 5.0 Volts to 2.5 Volts when the jumper wire was installed? Yes Verify that there is good pin to terminal contact in the 2/1 O2 Sensor and Powertrain Control Module connectors. If OK, replace the 2/1 O2 Sensor. Refer to «SENSOR, OXYGEN, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/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 . NOTE: Remove the jumper wire before continuing.
9. O2 SENSOR SIGNAL CIRCUIT Using the scan tool, monitor all the O2 Sensor voltage reading with the jumper wire removed. NOTE: The scan tool will display all O2 Sensor voltage readings approximately 5.0 Volts when only one O2 Sensor's Signal circuit is shorted to voltage. NOTE: The scan tool will display one O2 Sensor voltage close to zero and the others will read lower than normal when one O2 Sensor Signal circuit contains excessive resistance. Is the voltage between 4.1 and 5.0 Volts? Yes Go To 10 . No Check all the O2 Signal circuits for a short to ground, open or short to voltage. Inspect the O2 Sensor connector and the PCM harness connector. If OK, 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 POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .
10. (K902) O2 RETURN UPSTREAM CIRCUIT Measure the voltage on the (K902) O2 Return Upstream circuit in the O2 Sensor harness connector. Is the voltage at 2.5 Volts? Yes Go To 11 . No Check the (K902) O2 Return Upstream circuit for a short to ground, open or short to voltage. Inspect the O2 Sensor connector and the PCM harness connector. If OK, 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 POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .
11. POWERTRAIN CONTROL MODULE (PCM) Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the related 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. 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»(/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. Refer to «MODULE, POWERTRAIN CONTROL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/communication-devices/#electronic-control-modules-service-information) . Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .
12. 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. Raise vehicle on hoist and disconnect the fuel pressure line at the fuel pump module. Install 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 ASD Fuel System test and observe the fuel pressure gauge. NOTE: Fuel pressure specification: 5.7L is 407 kPa +/- 34 kPa (59 psi +/- 5 psi), 3.6L is 400 kPa +/- 14 kPa (58 psi +/- 2 psi). Is the fuel pressure within specification? Yes Repair or replace fuel supply line as necessary. Refer to «MODULE, FUEL PUMP, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/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 13 . CAUTION: Stop All Actuations.
13. FUEL PUMP 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. 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. Refer to «MODULE, FUEL PUMP, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/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 14 .
14. FUEL PUMP MODULE Repair Verify that there is good pin to terminal contact in the Fuel Pump Module, Relay and Powertrain Control Module connectors. If OK, replace the Fuel Pump Module. Refer to «MODULE, FUEL PUMP, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .

P113D-O2 SENSOR 1/1 SLOW RESPONSE (HIGH FREQUENCY)

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

For an aged O2 sensor, the response rate to the air/fuel change is slower than when it was new. The O2 sensor tends to move less with the same air/fuel changes in a given time frame. Therefore by observing the activity of voltage readings from the upstream O2 sensor, the quality of the O2 sensor can be detected. DTCs P113D and P113E are used to validate the high frequency switching of the O2 sensor for DTCs P219A and P219B.

With the Engine Coolant Temperature (ECT) at least 60° C (140° F), engine RPM between 1000 and 2750, minimum engine run time of 20 seconds and Manifold Absolute Pressure (MAP) reading is between 21 - 96 kPa (6.2 - 28.3 inHg).

The Powertrain Control Module (PCM) detects that the oxygen sensor signal does not switch adequately at high frequency. Two Trip Fault. Three good trips to turn off the MIL.

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

Scheme 357

1. ACTIVE DIAGNOSTIC TROUBLE CODE (DTC) NOTE: Check for contaminants that may have damaged the O2 Sensor: contaminated fuel, unapproved silicone, oil and coolant. NOTE: After the repairs have been made, verify proper O2 Sensor operation. If all the O2 Sensor voltage readings have not returned to normal, follow the diagnostic procedure for the remaining O2 Sensors. Start the engine. Allow the engine 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, read the active DTCs. NOTE: It may be necessary to drive the vehicle to meet the conditions to set this DTC, try to repeat the conditions in which the fault originally set by reviewing the Freeze Frame data. Is the DTC Active or Pending at this time? Yes Go To 2 . No Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to «INTERMITTENT CONDITION»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .
2. 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 152.4 mm (6 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 liquid/soapy water 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»(/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. (K41) O2 1/1 SIGNAL CIRCUIT Turn the ignition off Disconnect the 1/1 O2 Sensor harness connector. Ignition on, engine not running. Measure the voltage on the (K41) O2 1/1 Signal circuit in the O2 Sensor harness connector. Is the voltage between 4.1 and 5.0 Volts? Yes Go To 4 . No Check the (K41) O2 1/1 Signal circuit for a short to ground, open, or short to voltage. If OK, replace and program the Powertrain Control Module in accordance with the service information. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .
4. (K902) O2 RETURN UPSTREAM CIRCUIT Measure the voltage on the (K902) O2 Return Upstream circuit in the O2 Sensor harness connector. Is the voltage at 2.5 Volts? Yes Go To 5 . No Check the (K902) O2 Return Upstream circuit for a short to ground, open, or short to voltage. If OK, replace and program the Powertrain Control Module in accordance with the service information. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .
5. O2 SENSOR NOTE: Check for signs of contaminants that may have damaged the O2 Sensor, such as contaminated fuel, unapproved silicone, oil and coolant. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the 1/1 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. Verify that there is good pin to terminal contact in the 1/1 O2 Sensor and Powertrain Control Module connectors. Perform 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»(/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 1/1 Oxygen Sensor in accordance with the Service Information. Refer to «SENSOR, OXYGEN, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .

P113E-O2 SENSOR 2/1 SLOW RESPONSE (HIGH FREQUENCY)

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

For an aged O2 sensor, the response rate to the air/fuel change is slower than when it was new. The O2 sensor tends to move less with the same air/fuel changes in a given time frame. Therefore by observing the activity of voltage readings from the upstream O2 sensor, the quality of the O2 sensor can be detected. DTCs P113D and P113E are used to validate the high frequency switching of the O2 sensor for DTCs P219A and P219B.

With the ECT at least 60° C (140° F), engine RPM between 1000 and 2750, minimum engine run time of 20 seconds and Manifold Absolute Pressure (MAP) reading is between 21 - 96 kPa (6.2 - 28.3 inHg).

The Powertrain Control Module (PCM) detects that the oxygen sensor signal does not switch adequately at high frequency. Two Trip Fault. Three good trips to turn off the MIL.

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

1. ACTIVE DIAGNOSTIC TROUBLE CODE (DTC) NOTE: Check for contaminants that may have damaged the O2 Sensor: contaminated fuel, unapproved silicone, oil and coolant. NOTE: After the repairs have been made, verify proper O2 Sensor operation. If all the O2 Sensor voltage readings have not returned to normal, follow the diagnostic procedure for the remaining O2 Sensors. Start the engine. Allow the engine 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 the scan tool, read DTCs. NOTE: It may be necessary to drive the vehicle to meet the conditions to set this DTC, try to repeat the conditions in which the fault originally set by reviewing the Freeze Frame data. Is the DTC Active or Pending at this time? Yes Go To 2 . No Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to «INTERMITTENT CONDITION»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .
2. 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-EC, Exhaust Cone) 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 152.4 mm (6 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 liquid/soapy water 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»(/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. (K43) O2 2/1 SIGNAL CIRCUIT Turn the ignition off Disconnect the O2 Sensor harness connector. Ignition on, engine not running. Measure the voltage on the (K43) O2 2/1 Signal circuit in the O2 Sensor harness connector. Is the voltage between 4.1 and 5.0 Volts? Yes Go To 4 . No Check the (K43) O2 2/1 Signal circuit for a short to ground, open or short to voltage. If OK, 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 POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .
4. (K902) O2 RETURN UPSTREAM CIRCUIT Measure the voltage on the (K902) O2 Return Upstream circuit in the O2 Sensor harness connector. Is the voltage at 2.5 Volts? Yes Go To 5 . No Check the (K902) O2 Return Upstream circuit for a short to ground, open or short to voltage. If OK, replace and program the Powertrain Control Module in accordance with the Service Information. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .
5. OXYGEN SENSOR NOTE: Check for signs of contaminants that may have damaged the O2 Sensor, such as contaminated fuel, unapproved silicone, oil and coolant. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the 2/1 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. Verify that there is good pin to terminal contact in the 2/1 O2 Sensor and Powertrain Control Module connectors. Perform 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»(/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 2/1 Oxygen Sensor in accordance with the Service Information. Refer to «SENSOR, OXYGEN, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .

P1239-ENGINE OIL TEMPERATURE TOO LOW

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

The engine oil temperature has dropped below a calibrated temperature value. Engine start up.

The Engine Oil temperature rises slower than a calibrated modeled temperature. When the actual oil temperature falls below the low boundary of the calibrated modeled temperature for three minutes the fault is set. Two trip fault. Three good trips to turn off the MIL.

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

1. DTC IS ACTIVE NOTE: Diagnose any CAN - C Communication DTCs before continuing. Turn the ignition off. If possible, allow the vehicle to sit with the ignition off for more than 60 minutes in an environment where the temperature will allow the oil temperature to cool down. Start the engine and allow it to reach normal operating conditions. With the scan tool, select View DTCs. Is the status Active or Pending for this DTC? Yes Go to 2 . No Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to «INTERMITTENT CONDITION»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .
2. ENGINE OIL The following conditions must be checked: OEM recommended oil viscosity is being used. Customer is following the oil change schedule. Check the engine oil for contamination. (i.e., fuel and/or engine coolant) Internal engine condition that may effect oil pressure. Were any of the above conditions found? Yes Repair as necessary. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/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. ENGINE OIL TEMPERATURE SENSOR VOLTAGE Turn the ignition off. Disconnect the Engine Oil Temperature Sensor harness connector. Turn the ignition on. With the scan tool, read the Engine Oil Temperature Sensor voltage. NOTE: The sensor voltage should be approximately 5.0 Volts (plus or minus.1 Volt) with the connector disconnected. Does the scan tool display the voltage as described above? Yes Go to 4 . No Go to 5 .
4. ENGINE OIL TEMPERATURE SENSOR Turn the ignition off. Connect a jumper wire between the (G224) EOT Signal circuit and the (K900) Sensor Ground circuit in the Engine Oil Temperature Sensor harness connector. Turn the ignition on. With the scan tool, read the Engine Oil Temperature Sensor voltage. NOTE: The sensor voltage should be approximately 0.0 Volts (plus or minus.1 of a Volt) with the jumper wire in place. Does the scan tool display the voltage as described above? Yes Replace the Engine Oil Temperature Sensor. Refer to «SENSOR, OIL TEMPERATURE, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) . Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/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. (G224) EOT SIGNAL CIRCUIT HIGH RESISTANCE Turn the ignition off. Connect the Engine Oil Temperature Sensor 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) along with the (special tool #8815-1, PCM Pinout Box Adapter) to perform the diagnosis. Using a Voltmeter, perform a voltage drop test by backprobing the (G224) EOT Signal circuit at the Engine Oil Temperature Sensor harness connector and probing the appropriate terminal of the PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position). Make sure the Voltmeter leads are connected so that positive polarity is displayed on the Voltmeter. 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 can result in possible serious or fatal injury. Start the engine. Is the voltage below 0.5 of a Volt? Yes Go to 6 . No Repair the (G224) EOT Signal circuit for high resistance. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .
6. (K900) SENSOR GROUND CIRCUIT HIGH RESISTANCE 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) along with the (special tool #8815-1, PCM Pinout Box Adapter) to perform the diagnosis. Using a Voltmeter, perform a voltage drop test by backprobing the (K900) Sensor Ground circuit at the Engine Oil Temperature Sensor harness connector and probing the appropriate terminal of the PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position). Make sure the Voltmeter leads are connected so that positive polarity is displayed on the Voltmeter. 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 can result in personal injury or death. Start the engine. Is the voltage below 0.5 of a Volt? Yes Go to 7 . No Repair the (K900) Sensor Ground circuit for high resistance. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .
7. POWERTRAIN CONTROL MODULE (PCM) Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Engine Oil 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. 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 POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/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 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 POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .

P1411-CYLINDER 1 REACTIVATION CONTROL PERFORMANCE

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

When all criteria has been met, power is supplied to each Multiple Displacement System (MDS) solenoid when the engine is making a transition from 8 cylinder mode to 4 cylinder mode. By actuating the solenoid, oil pressure is raised to the pair of lifters that coincide with each particular solenoid. The oil pressure pushes in the locking pins that allows the lifter to collapse, decoupling the valves and camshaft.

Transition from 8 to 4 cylinder mode.

The MDS fails to active and take place for cylinder 1. One trip fault.

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

Scheme 358

Scheme 359

Scheme 360

1. ACTIVE DTC NOTE: Diagnose any Misfire DTCs before continuing. 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. NOTE: It may be necessary to test drive the vehicle in order for this DTC to set. With the scan tool, select View DTCs. Is the DTC Active at this time? Yes Go To 2 . No Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to «INTERMITTENT CONDITION»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .
2. (K451) MDS SOLENOID NO. 1 CONTROL CIRCUIT SHORTED TO VOLTAGE Turn the ignition off. Disconnect the C3 PCM harness connector. Disconnect the MDS In-line 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. Turn the ignition on. Measure the voltage on (K451) MDS Solenoid No. 1 Control circuit in the appropriate terminal of the PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position). Is voltage present? Yes Repair the short to voltage in the (K451) MDS Solenoid No. 1 Control circuit. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/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. MDS SOLENOID RESISTANCE Turn the ignition off. Reconnect the MDS In-line harness connector. Measure the resistance between Ground and the (K451) MDS Solenoid No. 1 Control circuit in the appropriate terminal of PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position). NOTE: It is important to follow the below temp/resistance values to ensure an accurate reading. MDS SOLENOID RESISTANCE TEMPERATURE VALUE RESISTANCE - MINIMUM RESISTANCE - MAXIMUM -18° C (0° F) 7.22 ? 8.12 ? 0° C (32° F) 7.92 ? 8.82 ? 20° C (68° F) 8.72 ? 9.62 ? 38° C (100° F) 9.42 ? 10.32 ? 66° C (150° F) 10.62 ? 11.52 ? 93° C (200° F) 11.82 ? 12.72 ? 121° C (250° F) 12.82 ? 13.72 ? 149° C (300° F) 14.02 ? 14.92 ? Is the resistance within an acceptable range? Yes Go To 4 . No Visually and Physically inspect the wiring harness between the MDS In-line connector and the MDS Solenoid connector. Repair as necessary. If OK, replace the MDS Solenoid in accordance with the Service Information. Refer to «SOLENOID, MULTIPLE DISPLACEMENT, REMOVAL, 5.7L»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#57l-engine-service-information) . Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .
4. PCM CONTROL Turn the ignition off. Reconnect the C3 PCM harness connector. Disconnect the MDS In-line harness connector. Ignition on, engine not running. Using a 12-volt test light connected to the (Z903) Ground circuit, probe the (K451) MDS Solenoid No. 1 Control circuit in the MDS In-line harness connector (PCM side). With the scan tool, actuate the MDS Solenoid. NOTE: The test light should be illuminated and bright proportional to the maximum duty cycle allowed by the scan tool. For example, if the scan tool allows 100% actuation, the brightness should be as bright as a direct connection to the battery. If the scan tool allows a maximum 25% actuation, the brightness should be 25% as bright as a direct connection to the battery. Does the test light illuminate accordingly during the actuation? Yes Go To 5 . 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 POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .
5. MDS SOLENOID 1 Turn the ignition off. Remove the Intake Manifold in accordance with the Service Information. Refer to «MANIFOLD, INTAKE, REMOVAL, 5.7L»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#57l-engine-service-information) . Turn the ignition on. With the scan tool actuate the MDS Solenoid 1. Can you feel and hear the Solenoid Actuating? Yes Go To 6 . No Remove the Solenoid (1) and check for any debris that may be blocking the oil passages (3) to the Solenoid. If the passages are clogged, clean the passages and replace the MDS Solenoid 1. If the passages are not clogged with debris, replace the MDS Solenoid 1. Refer to «SOLENOID, MULTIPLE DISPLACEMENT, REMOVAL, 5.7L»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#57l-engine-service-information) . Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .
6. OIL PASSAGES RESTRICTED Turn the ignition off. Remove both Solenoids on Bank 1 of the engine block. Refer to «SOLENOID, MULTIPLE DISPLACEMENT, REMOVAL, 5.7L»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#57l-engine-service-information) . Remove the Bank 1 Cylinder Head in accordance with the Service Information. Refer to «CYLINDER HEAD, REMOVAL, 5.7L»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#57l-engine-service-information) . Remove the Lifters from the left engine bank. Refer to «LIFTER(S), HYDRAULIC, ROLLER, REMOVAL, 5.7L»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#57l-engine-service-information) . Inspect the oil passages to the Solenoids and from the Solenoids to the lifters. Are the passages blocked? Yes Clean the oil passages as necessary. If the entire engine is restricted disassembly of the entire engine block may be necessary. Refer to appropriate information in «5.7L ENGINE - SERVICE INFORMATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#57l-engine-service-information) article. . Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/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 both sets of lifters if no other possible causes remain. Refer to «LIFTER(S), HYDRAULIC, ROLLER, REMOVAL, 5.7L»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#57l-engine-service-information) . Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .

P1414-CYLINDER 4 REACTIVATION CONTROL PERFORMANCE

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

When all criteria has been met, power is supplied to each Multiple Displacement System (MDS) solenoid when the engine is making a transition from 8 cylinder mode to 4 cylinder mode. By actuating the solenoid, oil pressure is raised to the pair of lifters that coincide with each particular solenoid. The oil pressure pushes in the locking pins that allows the lifter to collapse, decoupling the valves and camshaft.

Transition from 8 to 4 cylinder mode.

The MDS fails to active and take place for cylinder 4. One trip fault.

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

Scheme 361

Scheme 362

Scheme 363

1. ACTIVE DTC NOTE: Diagnose any Misfire DTCs before continuing. 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. NOTE: It may be necessary to test drive the vehicle in order for this DTC to set. With the scan tool, select View DTCs. Is the DTC Active at this time? Yes Go To 2 . No Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to «INTERMITTENT CONDITION»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .
2. (K452) MDS SOLENOID NO. 4 CONTROL CIRCUIT SHORTED TO VOLTAGE Turn the ignition off. Disconnect the C3 PCM harness connector. Disconnect the MDS In-line 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. Turn the ignition on. Measure the voltage on (K452) MDS Solenoid No. 4 Control circuit in the appropriate terminal of PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position). Is there any voltage present? Yes Repair the short to voltage in the (K452) MDS Solenoid No. 4 Control circuit. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/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. MDS SOLENOID RESISTANCE Turn the ignition off. Reconnect the MDS In-line harness connector. Measure the resistance between Ground and the (K452) MDS Solenoid No. 4 Control Circuit in the appropriate terminal of PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position). NOTE: It is important to follow the below temp/resistance values to ensure an accurate reading. MDS SOLENOID RESISTANCE TEMPERATURE VALUE RESISTANCE - MINIMUM RESISTANCE - MAXIMUM -18° C (0° F) 7.22 ? 8.12 ? 0° C (32° F) 7.92 ? 8.82 ? 20° C (68° F) 8.72 ? 9.62 ? 38° C (100° F) 9.42 ? 10.32 ? 66° C (150° F) 10.62 ? 11.52 ? 93° C (200° F) 11.82 ? 12.72 ? 121° C (250° F) 12.82 ? 13.72 ? 149° C (300° F) 14.02 ? 14.92 ? Is the resistance within an acceptable range? Yes Go To 4 . No Visually and Physically inspect the wiring harness between the MDS In-line connector and the MDS Solenoid connector. Repair as necessary. If OK, replace the MDS Solenoid in accordance with the Service Information.
4. PCM CONTROL Turn the ignition off. Reconnect the C3 Powertrain Control Module (PCM) harness connector. Disconnect the MDS In-line harness connector. Ignition on, engine not running. Using a 12-volt test light connected to the (Z903) Ground circuit, probe the (K452) MDS Solenoid No. 4 Control circuit in the MDS In-line harness connector (PCM side). With the scan tool, actuate the MDS Solenoid. NOTE: The test light should be illuminated and bright proportional to the maximum duty cycle allowed by the scan tool. For example, if the scan tool allows 100% actuation, the brightness should be as bright as a direct connection to the battery. If the scan tool allows a maximum 25% actuation, the brightness should be 25% as bright as a direct connection to the battery. Does the test light illuminate accordingly during the actuation? Yes Go To 5 . 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 POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .
5. MDS SOLENOID 4 Turn the ignition off. Remove the Intake Manifold in accordance with the Service Information. Refer to «MANIFOLD, INTAKE, REMOVAL, 5.7L»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#57l-engine-service-information) . Reconnect the Solenoid harness connector. Turn the ignition on. With the scan tool actuate the MDS Solenoid 4. Can you feel and hear the Solenoid Actuating? Yes Go To 6 . No Remove the Solenoid and check for any debris that may be blocking the oil passages to the Solenoid. If the passages are clogged, clean the passages and replace the MDS Solenoid 4. If the passages are not clogged with debris, replace the MDS Solenoid 4. Refer to «SOLENOID, MULTIPLE DISPLACEMENT, REMOVAL, 5.7L»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#57l-engine-service-information) . Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .
6. OIL PASSAGES RESTRICTED Turn the ignition off. Remove both Solenoids on Bank 2 of the engine block. Refer to «SOLENOID, MULTIPLE DISPLACEMENT, REMOVAL, 5.7L»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#57l-engine-service-information) . Remove the Bank 2 Cylinder Head in accordance with the Service Information. Refer to «CYLINDER HEAD, REMOVAL, 5.7L»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#57l-engine-service-information) . Remove the Lifters from the right engine bank. Refer to «LIFTER(S), HYDRAULIC, ROLLER, REMOVAL, 5.7L»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#57l-engine-service-information) . Inspect the oil passages to the Solenoids and from the Solenoids to the lifters. Are the passages blocked? Yes Clean the oil passages as necessary. If the entire engine is restricted disassembly of the entire engine block may be necessary. Refer to appropriate information in «5.7L ENGINE - SERVICE INFORMATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#57l-engine-service-information) article. . Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/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 both sets of lifters if no other possible causes remain. Refer to «LIFTER(S), HYDRAULIC, ROLLER, REMOVAL, 5.7L»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#57l-engine-service-information) . Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .

Scheme 364

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

When all criteria has been met, power is supplied to each Multiple Displacement System (MDS) solenoid when the engine is making a transition from 8 cylinder mode to 4 cylinder mode. By actuating the solenoid, oil pressure is raised to the pair of lifters that coincide with each particular solenoid. The oil pressure pushes in the locking pins that allows the lifter to collapse, decoupling the valves and camshaft.

Transition from 8 to 4 cylinder mode.

The MDS fails to active and take place for cylinder 6. One trip fault.

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

Scheme 365

Scheme 366

1. ACTIVE DTC NOTE: Diagnose any Misfire DTCs before continuing. 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. NOTE: It may be necessary to test drive the vehicle in order for this DTC to set. With the scan tool, select View DTCs. Is the DTC Active at this time? Yes Go To 2 . No Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to «INTERMITTENT CONDITION»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .
2. (K453) MDS SOLENOID NO. 6 CONTROL CIRCUIT SHORTED TO VOLTAGE Turn the ignition off. Disconnect the C2 PCM harness connector. Disconnect the MDS In-line 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. Turn the ignition on. Measure the voltage on (K453) MDS Solenoid No. 6 Control circuit in the appropriate terminal of PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position). Is voltage present? Yes Repair the short to voltage in the (K453) MDS Solenoid No. 6 Control circuit. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/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. MDS SOLENOID RESISTANCE Turn the ignition off. Reconnect the MDS In-line harness connector. Measure the resistance between Ground and the (K453) MDS Solenoid No. 6 Control circuit in the appropriate terminal of PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position). NOTE: It is important to follow the below temp/resistance values to ensure an accurate reading. MDS SOLENOID RESISTANCE TEMPERATURE VALUE RESISTANCE - MINIMUM RESISTANCE - MAXIMUM -18° C (0° F) 7.22 ? 8.12 ? 0° C (32° F) 7.92 ? 8.82 ? 20° C (68° F) 8.72 ? 9.62 ? 38° C (100° F) 9.42 ? 10.32 ? 66° C (150° F) 10.62 ? 11.52 ? 93° C (200° F) 11.82 ? 12.72 ? 121° C (250° F) 12.82 ? 13.72 ? 149° C (300° F) 14.02 ? 14.92 ? Is the resistance within an acceptable range? Yes Go To 4 . No Visually and Physically inspect the wiring harness between the MDS In-line connector and the MDS Solenoid connector. Repair as necessary. If OK, replace the MDS Solenoid in accordance with the Service Information.
4. PCM CONTROL Turn the ignition off. Reconnect the C2 PCM harness connector. Disconnect the MDS In-line harness connector. Ignition on, engine not running. Using a 12-volt test light connected to the (Z903) Ground circuit, probe the (K453) MDS Solenoid No. 6 Control circuit in the MDS In-line harness connector (PCM side). With the scan tool, actuate the MDS Solenoid. NOTE: The test light should be illuminated and bright proportional to the maximum duty cycle allowed by the scan tool. For example, if the scan tool allows 100% actuation, the brightness should be as bright as a direct connection to the battery. If the scan tool allows a maximum 25% actuation, the brightness should be 25% as bright as a direct connection to the battery. Does the test light illuminate accordingly during the actuation? Yes Go To 5 . 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 POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .
5. MDS SOLENOID 6 Turn the ignition off. Remove the Intake Manifold in accordance with the Service Information. Refer to «MANIFOLD, INTAKE, REMOVAL, 5.7L»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#57l-engine-service-information) . Reconnect the Solenoid connector. Turn the ignition on. With the scan tool actuate the MDS Solenoid 6. Can you feel and hear the Solenoid Actuating? Yes Go To 6 . No Remove the Solenoid and check for any debris that may be blocking the oil passages to the Solenoid. If the passages are clogged, clean the passages and replace the MDS Solenoid 6. If the passages are not clogged with debris, replace the MDS Solenoid 6. Refer to «SOLENOID, MULTIPLE DISPLACEMENT, REMOVAL, 5.7L»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#57l-engine-service-information) . Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .
6. OIL PASSAGES RESTRICTED Turn the ignition off. Remove both Solenoids on Bank 2 of the engine block. Refer to «SOLENOID, MULTIPLE DISPLACEMENT, REMOVAL, 5.7L»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#57l-engine-service-information) . Remove the Bank 2 Cylinder Head in accordance with the Service Information. Refer to «CYLINDER HEAD, REMOVAL, 5.7L»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#57l-engine-service-information) . Remove the Lifters from the right engine bank. Refer to «LIFTER(S), HYDRAULIC, ROLLER, REMOVAL, 5.7L»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#57l-engine-service-information) . Inspect the oil passages to the Solenoids and from the Solenoids to the lifters. Are the passages blocked? Yes Clean the oil passages as necessary. If the entire engine is restricted disassembly of the entire engine block may be necessary. Refer to appropriate information in «5.7L ENGINE - SERVICE INFORMATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#57l-engine-service-information) article. . Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/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 both sets of lifters if no other possible causes remain. Refer to «LIFTER(S), HYDRAULIC, ROLLER, REMOVAL, 5.7L»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#57l-engine-service-information) . Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .

P1417-CYLINDER 7 REACTIVATION CONTROL PERFORMANCE

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

When all criteria has been met, power is supplied to each Multiple Displacement System (MDS) solenoid when the engine is making a transition from 8 cylinder mode to 4 cylinder mode. By actuating the solenoid, oil pressure is raised to the pair of lifters that coincide with each particular solenoid. The oil pressure pushes in the locking pins that allows the lifter to collapse, decoupling the valves and camshaft.

Transition from 8 to 4 cylinder mode.

The MDS fails to active and take place for cylinder 7. One trip fault.

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

Scheme 367

Scheme 368

1. ACTIVE DTC NOTE: Diagnose any Misfire DTCs before continuing. 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. NOTE: It may be necessary to test drive the vehicle in order for this DTC to set. With the scan tool, select View DTCs. Is the DTC Active at this time? Yes Go To 2 . No Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to «INTERMITTENT CONDITION»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .
2. (K454) MDS SOLENOID NO. 7 CONTROL CIRCUIT SHORTED TO VOLTAGE Turn the ignition off. Disconnect the C3 PCM harness connector. Disconnect the MDS In-line 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. Turn the ignition on. Measure the voltage on (K454) MDS Solenoid No. 7 Control circuit in the appropriate terminal of PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position). Is there any voltage present? Yes Repair the short to voltage in the (K454) MDS Solenoid No. 7 Control circuit. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/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. MDS SOLENOID RESISTANCE Turn the ignition off. Reconnect the MDS In-line harness connector. Measure the resistance between Ground and the (K454) MDS Solenoid No. 7 Control circuit in the appropriate terminal of PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position). NOTE: It is important to follow the below temp/resistance values to ensure an accurate reading. MDS SOLENOID RESISTANCE TEMPERATURE VALUE RESISTANCE - MINIMUM RESISTANCE - MAXIMUM -18° C (0° F) 7.22 ? 8.12 ? 0° C (32° F) 7.92 ? 8.82 ? 20° C (68° F) 8.72 ? 9.62 ? 38° C (100° F) 9.42 ? 10.32 ? 66° C (150° F) 10.62 ? 11.52 ? 93° C (200° F) 11.82 ? 12.72 ? 121° C (250° F) 12.82 ? 13.72 ? 149° C (300° F) 14.02 ? 14.92 ? Is the resistance within an acceptable range? Yes Go To 4 . No Visually and Physically inspect the wiring harness between the MDS In-line connector and the MDS Solenoid connector. Repair as necessary. If OK, replace the MDS Solenoid in accordance with the Service Information. Refer to «SOLENOID, MULTIPLE DISPLACEMENT, REMOVAL, 5.7L»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#57l-engine-service-information) . Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .
4. PCM CONTROL Turn the ignition off. Reconnect the C3 PCM harness connector. Disconnect the MDS In-line harness connector. Ignition on, engine not running. Using a 12-volt test light connected to the (Z903) Ground circuit, probe the (K454) MDS Solenoid No. 7 Control circuit in the MDS harness connector. With the scan tool, actuate the MDS Solenoid. NOTE: The test light should be illuminated and bright proportional to the maximum duty cycle allowed by the scan tool. For example, if the scan tool allows 100% actuation, the brightness should be as bright as a direct connection to the battery. If the scan tool allows a maximum 25% actuation, the brightness should be 25% as bright as a direct connection to the battery. Does the test light illuminate accordingly during the actuation? Yes Go To 5 . 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»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .
5. MDS SOLENOID 7 Turn the ignition off. Remove the Intake Manifold in accordance with the Service Information. Refer to «MANIFOLD, INTAKE, REMOVAL, 5.7L»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#57l-engine-service-information) . Reconnect the Solenoid harness connector. Turn the ignition on. With the scan tool actuate the MDS Solenoid 7. Can you feel and hear the Solenoid Actuating? Yes Go To 6 . No Remove the Solenoid and check for any debris that may be blocking the oil passages to the Solenoid. If the passages are clogged, clean the passages and replace the MDS Solenoid 7. If the passages are not clogged with debris, replace the MDS Solenoid 7 in accordance with the Service Information. Refer to «SOLENOID, MULTIPLE DISPLACEMENT, REMOVAL, 5.7L»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#57l-engine-service-information) . Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .
6. OIL PASSAGES RESTRICTED Turn the ignition off. Remove both Solenoids on Bank 1 of the engine block in accordance with the Service Information. Refer to «SOLENOID, MULTIPLE DISPLACEMENT, REMOVAL, 5.7L»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#57l-engine-service-information) . Remove the Bank 1 Cylinder Head in accordance with the Service Information. Refer to «CYLINDER HEAD, REMOVAL, 5.7L»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#57l-engine-service-information) . Remove the Lifters from the left engine bank in accordance with the Service Information. Refer to «LIFTER(S), HYDRAULIC, ROLLER, REMOVAL, 5.7L»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#57l-engine-service-information) . Inspect the oil passages to the Solenoids and from the Solenoids to the lifters. Are the passages blocked? Yes Clean the oil passages as necessary. If the entire engine is restricted disassembly of the entire engine block may be necessary. Refer to appropriate information in «5.7L ENGINE - SERVICE INFORMATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#57l-engine-service-information) article. . Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/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 both sets of lifters if no other possible causes remain. Refer to «LIFTER(S), HYDRAULIC, ROLLER, REMOVAL, 5.7L»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#57l-engine-service-information) . Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .

For information regarding engine oil. Refer to CAPACITIES AND RECOMMENDED FLUIDS , 3.6L ENGINE, DESCRIPTION , or 5.7L ENGINE, DESCRIPTION .

Engine Running.

Using the oil pressure, oil temperature and other vital engine inputs the Powertrain Control Module (PCM) can determine the engine oil viscosity. Incorrect viscosity will effect the operation of the MDS by delaying cylinder activation.

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

1. ACTIVE DTC NOTE: Review the customers oil change history. Make sure the customers is using the correct engine oil viscosity. If the incorrect oil is being used, change the oil, using the correct engine oil viscosity. Ignition on, engine off. With the scan tool, select View DTCs. Is the DTC Active at this time? Yes Go To 2 . No Test Complete.
2. ENGINE OIL NOTE: If any engine oil pressure or oil temperature DTCs set along with P1521, repair them before continuing with the P1521 diagnostics. The following conditions must be checked. OEM recommended oil viscosity is being used. Customer is following the oil change schedule. Check the engine oil for contamination. (i.e., fuel and/or engine coolant) Internal engine condition that may effect oil pressure. Were any of the above conditions found? Yes Repair as necessary. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) . No Change the engine oil using the correct oil viscosity. Refer to «FILTER, ENGINE OIL, 3.6L»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#57l-engine-service-information) , or «FILTER, ENGINE OIL, 5.7L»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#57l-engine-service-information) . Also see «CAPACITIES AND RECOMMENDED FLUIDS»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuses-circuit-breakers/#vehicle-quick-reference) . Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .

Scheme 369

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

For the Variable Camshaft Timing (VCT) to enable, the oil pressure has to be approximately 42 psi. For the VCT to remain enabled the engine oil pressure can not drop below 31 psi.

Engine running. RPM greater than or equal to 1100. Oil temperature less than or equal to 100° C (212° F)

The engine oil pressure never reaches the calibrated specification to allow the VCT activation. One trip fault.

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

Scheme 370

Scheme 371

Scheme 372

Scheme 373

Scheme 374

Scheme 375

1. ACTIVE DTC NOTE: Make sure that the engine oil is at the proper level. Also, check the customers oil change history to ensure that the oil is being changed at the correct intervals and that the proper oil viscosity is being used. 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. NOTE: Diagnose and repair any system voltage or sensor supply voltage DTCs before continuing with this test. Is the DTC Active at this time? Yes Go To 2 . No Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to «INTERMITTENT CONDITION»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .
2. ENGINE OIL/ENGINE MECHANICAL NOTE: The following items must be considered before determining the cause of this DTC. Failure to do so may lead to misdiagnosis. For the VCT to enable the oil pressure has to be approximately 42 psi. For the VCT to remain enabled the engine oil pressure can not drop below 31 psi. When checking the engine oil pressure use a mechanical gauge. ENGINE MECHANICAL TOLERANCES OUT OF SPECIFICATION ENGINE OIL PRESSURE OUT OF SPECIFICATION LOW ENGINE OIL OIL DIRTY OR DETERIORATED (Lack of scheduled oil changes) CORRECT VISCOSITY ENGINE OIL CONTAMINATED (i.e., coolant and/or fuel) If any of the above conditions are found, repair as necessary. Were any of the above conditions present? Yes Repair as necessary. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/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. ENGINE OIL PRESSURE SENSOR Turn the ignition off. Connect the C2 PCM harness connector. Ignition on, engine not running. With a scan tool, monitor the Engine Oil Pressure Sensor voltage. Connect a jumper wire between the (K900) Sensor Ground circuit and the (G6) Engine Oil Pressure Signal circuit. NOTE: Engine Oil Pressure voltage should change from approximately 4.5 volts to less than 0.5 of a volt. Is the voltage reading within the listed specification when the jumper wire is installed? Yes Verify that there is good pin to terminal contact in the Sensor and Powertrain Control Module connectors. Remove the Engine Oil Pressure sensor and ensure the oil passage/port is free from any blockage. If OK, replace the Engine Oil Pressure Sensor. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/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 . NOTE: Remove the jumper wire before continuing.
4. EXCESSIVE RESISTANCE IN THE (G6) ENGINE OIL PRESSURE SIGNAL CIRCUIT 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. Measure the resistance of the (G6) Engine Oil Pressure Signal circuit from the Engine Oil Pressure Sensor harness connector to the appropriate terminal of PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position). Is the resistance below 5.0 Ohms? Yes Go To 5 . No Repair the excessive resistance in the (G6) Engine Oil Pressure Signal circuit. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .
5. (G6) ENGINE OIL PRESSURE SIGNAL CIRCUIT SHORTED TO GROUND Measure the resistance between ground and the (G6) Engine Oil Pressure Signal circuit in the Engine Oil Pressure Sensor harness connector. Is the resistance below 100 Ohms? Yes Repair the short to ground in the (G6) Engine Oil Pressure Signal circuit. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/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. EXCESSIVE RESISTANCE IN THE (F855) 5-VOLT SUPPLY CIRCUIT Measure the resistance of the (F855) 5-volt Supply circuit from the Engine Oil Pressure Sensor harness connector to the appropriate terminal of PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position). Is the resistance below 5.0 Ohms? Yes Go To 7 . No Repair the excessive resistance in the (F855) 5-volt Supply circuit. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .
7. (F855) 5-VOLT SUPPLY SHORTED TO GROUND Measure the resistance between ground and the (F855) 5-volt Supply circuit in the Engine Oil Pressure Sensor harness connector. 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»(/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. EXCESSIVE RESISTANCE IN THE (K900) SENSOR GROUND CIRCUIT Measure the resistance of the (K900) Sensor Ground circuit from the Engine Oil Pressure Sensor harness connector to the appropriate terminal of PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position). Is the resistance below 5.0 Ohms? Yes Go To 9 . No Repair the excessive resistance in the (K900) Sensor Ground circuit. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .
9. POWERTRAIN CONTROL MODULE (PCM) Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Engine Oil 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. Verify that there is good pin to terminal contact in the 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»(/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 per Service Information. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .

P1572-BRAKE PEDAL STUCK ON

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

for further information. Refer to SWITCH, STOP LAMP, DESCRIPTION .

Ignition on. In plant mode only.

The Powertrain Control Module (PCM) recognizes the Brake Pedal could not electrically indicate the applied (On) position with both switch inputs. One trip fault.

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

1. ACTIVE DTC NOTE: Make sure the Stop Lamp Switch is adjusted properly before continuing. Ignition on, engine not running. With the scan tool, select View DTCs. It may be necessary to press and release the Brake Pedal to get the fault to become Active. Is the DTC Active at this time? Yes Go To 2 . No Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to «INTERMITTENT CONDITION»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .
2. STOP LAMP SWITCH OPERATION Turn the ignition off. Disconnect the Stop Lamp Switch harness connector. Measure the resistance between the (Z916) Ground circuit terminal and the (B15) Brake Switch No. 1 Signal terminal in the Stop Lamp Switch. Apply and release the Stop Lamp Switch while monitoring the ohmmeter. Does the resistance change from below 5.0 Ohms to open circuit when pressing and releasing the brake pedal switch? Yes Go To 3 . No Replace the Stop Lamp Switch. Refer to «SWITCH, STOP LAMP, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/exterior-lights/#lampslighting-exterior-service-information) . Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .
3. STOP LAMP SWITCH OPERATION Measure the resistance between the (F941) Fused Ignition Switch terminal and the (B16) Brake Switch No. 2 Signal circuit terminal in the Stop Lamp Switch. Apply and release the Stop Lamp Switch while monitoring the ohmmeter. Does the resistance change from below 5.0 Ohms to open circuit when pressing and releasing the Stop Lamp switch? Yes Go To 4 . No Replace the Stop Lamp Switch. Refer to «SWITCH, STOP LAMP, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/exterior-lights/#lampslighting-exterior-service-information) . Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .
4. (B15) BRAKE SWITCH NO. 1 SIGNAL CIRCUIT OPEN Disconnect the C3 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. Measure the resistance of the (B15) Brake Switch No. 1 Signal circuit from the Stop Lamp Switch harness connector to the appropriate terminal of PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position). Is the resistance below 5.0 Ohms? Yes Go To 5 . No Repair the open in the (B15) Brake Switch No. 1 Signal circuit. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .
5. (B16) BRAKE SWITCH NO. 2 SIGNAL CIRCUIT OPEN Measure the resistance of the (B16) Brake Switch No. 2 Signal circuit from the Stop Lamp Switch harness connector to the appropriate terminal of PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position). Is the resistance below 5.0 Ohms? Yes Go To 6 . No Repair the open in the (B16) Brake Switch No. 2 Signal circuit. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .
6. POWERTRAIN CONTROL MODULE (PCM) Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Stop Lamp Switch 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 Switch 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»(/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. Refer to «MODULE, POWERTRAIN CONTROL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/communication-devices/#electronic-control-modules-service-information) . Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .

P1573-BRAKE PEDAL STUCK OFF

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

Ignition on, In plant mode passed the Applied test.

The Powertrain Control Module (PCM) recognizes the Brake Pedal could not electronically indicate the released (Off) position with both switches. If P1572 sets, P1573 will also set. One trip fault.

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

Scheme 376

1. ACTIVE DTC NOTE: Make sure the Stop Lamp Switch is adjusted properly before continuing. Ignition on, engine not running. With the scan tool, select View DTCs. It may be necessary to press and release the Brake Pedal to get the code to become Active. Is the DTC Active at this time? Yes Go To 2 . No Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to «INTERMITTENT CONDITION»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .
2. STOP LAMP SWITCH OPERATION Turn the ignition off. Disconnect the Stop Lamp Switch harness connectors. Measure the resistance between the (Z916) Ground circuit terminal and the (B15) Brake Switch No. 1 Signal terminal in the Stop Lamp Switch. Apply and release the Stop Lamp Switch while monitoring the ohmmeter. Does the resistance change from below 5.0 Ohms to an open circuit when pressing and releasing the brake switch? Yes Go To 3 . No Replace the Stop Lamp Switch. Refer to «SWITCH, STOP LAMP, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/exterior-lights/#lampslighting-exterior-service-information) . Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .
3. STOP LAMP SWITCH OPERATION Measure the resistance between the (F941) Fused Ignition Switch circuit terminal and the (B16) Brake Switch No. 2 Signal circuit terminal in the Stop Lamp Switch. Apply and release the Stop Lamp Switch while monitoring the ohmmeter. Does the resistance change from below 5.0 Ohms to an open circuit when pressing and releasing the Stop Lamp switch? Yes Go To 4 . No Replace the Stop Lamp Switch. Refer to «SWITCH, STOP LAMP, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/exterior-lights/#lampslighting-exterior-service-information) . Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .
4. (B16) BRAKE SWITCH NO. 2 SIGNAL CIRCUIT SHORTED TO VOLTAGE Disconnect the C3 PCM harness connector. Ignition on, engine not running. Measure the voltage on the (B16) Brake Switch No. 2 Signal circuit in the Stop Lamp Switch harness connector. Is there any voltage present? Yes Repair the short to voltage in the (B16) Brake Switch No. 2 Signal circuit. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/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. (B15) BRAKE SWITCH NO. 1 SIGNAL CIRCUIT SHORTED TO GROUND Turn the ignition off. Measure the resistance between ground and the (B15) Brake Switch No. 1 Signal circuit in the Stop Lamp Switch harness connector. Is the resistance below 100 Ohms? Yes Repair the short to ground in the (B15) Brake Switch No. 1 Signal circuit. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/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. POWERTRAIN CONTROL MODULE (PCM) Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Stop Lamp Switch 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 Switch 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»(/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. Refer to «MODULE, POWERTRAIN CONTROL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/communication-devices/#electronic-control-modules-service-information) . Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .

P1593-SPEED CONTROL SWITCH 1/2 STUCK

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

The Speed Control Switch is hardwired to the Steering Column Control Module (SCCM). The SCCM is located near the top of the steering column below the steering wheel. The SCCM includes the steering column shroud, the Steering Angle Sensor (SAS), the Clockspring, the Multi-function Switch, a Steering Column Power Tilt and Telescope Switch (if equipped), and a trim cover. The speed control messages are bussed to the Powertrain Control Module (PCM) via the Can Bus.

Continuously with the ignition on.

Fault signifies when the switch voltage does not register a valid cruise position.

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

1. CHECK FOR AN ACTIVE DTC WARNING: Turn the ignition off disconnect the 12-volt battery and wait two minutes before proceeding. Failure to follow these instructions may result in possible serious or fatal injury. WARNING: Do not place an intact non-deployed airbag face down on a hard surface, the airbag propels into the air if accidentally deployed. Failure to follow these instructions may result in possible serious or fatal injury. Turn the ignition on. With the scan tool, read DTCs. Does the scan tool display this DTC as active? Yes NOTE: Visually and physically inspect the wiring harness between the Speed Control Switch harness connector and the SCCM harness connector. Repair any damaged wires, connectors, and open/spread terminals. If harness is OK, proceed with test. Replace the Speed Control Switch in accordance with the Service Information. Refer to «SWITCH, SPEED CONTROL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/cruise-control-systems/#speed-control-service-information__removal) . Perform the PCM VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) . No Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to «INTERMITTENT CONDITION»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .

P1607-PCM INTERNAL SHUTDOWN TIMER RATIONALITY TOO SLOW

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

The Powertrain Control Module (PCM) compares actual shutdown time to a calculated shutdown time value. The calculated shut down time value is based on the amount the Engine Coolant Temperature (ECT) should drop after a completely warmed up engine is shut down for a minimum of 8 hours. If the difference between actual shutdown time and the calculated shut down time is greater than a maximum value, a one trip failure will set. The shutdown time is measured again after 1 hour of ignition off time following the next engine warm up cycle. The PCM compares the shutdown time to a calculated value. If the difference is greater than a maximum value, the MIL is illuminated and a DTC will set.

With the engine running after a cycle when a complete engine warm up was achieved, the difference between engine coolant temperature and ambient air temperature less than or equal to 10° C (50° F) and battery voltage greater than 10 Volts.

This DTC sets if the engine coolant temp does not drop enough or drops too much during engine off time. This DTC may also set if the controller timer is inaccurate. Two Trip Fault. Three good trips to turn off the MIL.

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

1. ENGINE COOLANT INSPECTION NOTE: This DTC will set if the engine cools quicker than is should compared to engine off times. If the customer washed a hot engine with the engine off, a One Trip Failure will set. If the vehicle is parked in a highly ventilated area or has a large fan blowing on it which might cause the engine to cool quicker than expected this DTC may set. WARNING: Do not remove or loosen the radiator cap with the system hot and under pressure. Serious burns from coolant can occur. Turn the ignition off. Allow the engine to cool enough to allow the pressure in the coolant system to drop enough to safely remove the radiator cap. Check the coolant level and condition. Is the engine coolant level filled to the proper level? Yes Go To 2 . No Add the appropriate type and amount of engine coolant. Refer to «STANDARD PROCEDURE»(/jeep/grand-cherokee/wk2-2010-2013/remont/accessory-drive-belts/#engine-cooling-system) . Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .
2. POWERTRAIN CONTROL MODULE (PCM) Turn the ignition on. With the scan tool monitor the Ignition Off Time value. While monitoring a stop watch, turn the Ignition off for 10 minutes, watch the stop watch for those 10 minutes and then turn the Ignition on. With the scan tool check the Ignition Off Time value again. Does the Ignition Time Off value on the scan tool match the actual time you had the Ignition off on the stop watch? Yes The conditions that set the DTC are not active at this time. Refer to the INTERMITTENT CONDITION diagnostic procedure. Refer to «INTERMITTENT CONDITION»(/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. Refer to «MODULE, POWERTRAIN CONTROL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/communication-devices/#electronic-control-modules-service-information) . Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .

P1618-SENSOR REFERENCE VOLTAGE 1 CIRCUIT ERRATIC

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

Ignition on.

When the PCM recognizes the Primary 5-Volt Supply circuit voltage is varying too much too quickly. One Trip Fault. ETC light is flashing.

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

Scheme 377

Scheme 378

1. ACTIVE DIAGNOSTIC TROUBLE CODE (DTC) NOTE: Improperly installed aftermarket accessories can cause this DTC to set. Check for any improperly installed aftermarket accessories before continuing with this test. Start the engine and allow it to idle for at least 60 seconds. 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, read the active DTCs. Is the DTC Active at this time? Yes Go To 2 . No Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to «INTERMITTENT CONDITION»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .
2. (F855) PRIMARY 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND Turn the ignition off. Disconnect the C2 PCM harness connector. Disconnect all the Sensor harness connectors that share the (F855) Primary 5-Volt Supply circuit. NOTE: This code can be caused by the improper installation of after market accessories that may be causing excessive noise on the (F855) 5-Volt Supply circuit. Measure the resistance between ground and the (F855) Primary 5-Volt Supply circuit in the CKP Sensor harness connector. Is the resistance below 100 Ohms? Yes Repair the short to ground in the (F855) Primary 5-Volt Supply circuit. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/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. SENSOR SHORTED TO GROUND Connect the C2 PCM harness connector and all the previously disconnected Sensor harness connectors except for the Throttle Body harness connector. Ignition on, engine not running. Measure the voltage on the (F855) Primary 5-Volt Supply circuit at the Throttle Body harness connector. NOTE: You must Turn the Ignition Off when disconnecting any of the Sensor harness connectors and Turn the Ignition On to check the voltage readings. While monitoring the voltage, disconnect each Sensor harness connector that shares the (F855) Primary 5-Volt Supply circuit, one at a time. Does the voltage increase above 4.5 Volts when disconnecting any of the Sensor harness connectors? Yes Verify that there is good pin to terminal contact in the related Sensor and Powertrain Control Module connectors. If OK, replace the Sensor that causes the (F855) Primary 5-Volt Supply circuit voltage to increase when disconnected. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/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. 5-VOLT SENSOR Turn the ignition off. Connect all the previously disconnected Sensor harness connectors except for the CKP Sensor harness connector. Ignition on, engine not running. Measure the voltage on the (F855) Primary 5-Volt Supply circuit at the CKP Sensor harness connector. Is the voltage between 4.8 and 5.2 Volts? Yes Verify that there is good pin to terminal contact in the CKP Sensor and Powertrain Control Module connectors. If OK, replace the Crankshaft Position Sensor. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/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. (F855) PRIMARY 5-VOLT SUPPLY SHORTED TO VOLTAGE Turn the ignition off. Disconnect the C2 PCM harness connector. Disconnect all the Sensor harness connectors that share the (F855) Primary 5-Volt Supply circuit. Ignition on, engine not running. Measure the voltage on the (F855) Primary 5-Volt Supply circuit in the CKP Sensor harness connector. Is there any voltage present? Yes Repair the short to voltage in the (F855) Primary 5-Volt Supply circuit. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/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. (F855) PRIMARY 5-VOLT SUPPLY CIRCUIT OPEN Turn the ignition off. Reconnect all the Sensor harness connectors that were disconnected in the previous step except for the CKP Sensor 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. Measure the resistance in the (F855) Primary 5-Volt Supply circuit from the Sensor harness connector to the appropriate terminal of PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position). It may be necessary to perform this test from every sensor that uses the (F855) Primary 5-Volt Supply circuit. Is the resistance below 5.0 Ohms? Yes Go To 7 . No Repair the open in the (F855) Primary 5-Volt Supply circuit. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .
7. 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»(/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»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .

P1628-SENSOR REFERENCE VOLTAGE 2 CIRCUIT ERRATIC

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

Ignition on.

When the Powertrain Control Module (PCM) recognizes the Auxiliary 5-Volt Supply circuit voltage is varying too much to quickly. One Trip Fault. ETC light is flashing.

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

Scheme 379

1. ACTIVE DIAGNOSTIC TROUBLE CODE (DTC) NOTE: Improperly installed aftermarket accessories can cause this DTC to set. Check for any improperly installed aftermarket accessories before continuing with this test. Start the engine and allow it to idle for at least 60 seconds. 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, read the active DTCs. Is the DTC Active at this time? Yes Go To 2 . No Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to «INTERMITTENT CONDITION»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .
2. (F856) AUXILIARY 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND Turn the ignition off. Disconnect the C1 PCM harness connector. Disconnect all the Sensors that share the (F856) Auxiliary 5-Volt Supply circuit. NOTE: This code can be caused by the improper installation of after market accessories that may be causing excessive noise on the (F856) 5-Volt Supply circuit. Measure the resistance between ground and the (F856) Auxiliary 5-Volt Supply circuit at the CMP Sensor harness connector. Is the resistance below 100 Ohms? Yes Repair the short to ground in the (F856) Auxiliary 5-Volt Supply circuit. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/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. SENSOR SHORTED TO GROUND Connect the C1 PCM harness connector and all the previously disconnected Sensors except for the CMP Sensor harness connector. Ignition on, engine not running. Measure the voltage on the (F856) Auxiliary 5-Volt Supply circuit in the CMP Sensor harness connector. NOTE: You must Turn the Ignition OFF when disconnecting any of the Sensor harness connectors and Turn the Ignition On to check the voltage readings. While monitoring the voltage, disconnect each Sensor harness connector that shares the (F856) Auxiliary 5-Volt Supply circuit, one at a time. Does the voltage increase above 4.5 Volts when disconnecting any of the Sensor harness connectors? Yes Verify that there is good pin to terminal contact in the related Sensor and Powertrain Control Module connectors. If OK, replace the Sensor that causes the (F856) Auxiliary 5-Volt Supply circuit voltage to increase when disconnected. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/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. 5-VOLT SENSOR Turn the ignition off. Connect all the previously disconnected Sensors except for the CMP Sensor harness connector. Ignition on, engine not running. Measure the voltage on the (F856) Auxiliary 5-Volt Supply circuit in the CMP Sensor harness connector. Is the voltage below 4.5 Volts? Yes Go To 5 . No Verify that there is good pin to terminal contact in the CMP Sensor and Powertrain Control Module connectors. If OK, replace the Camshaft Position Sensor. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .
5. (F856) AUXILIARY 5-VOLT SUPPLY CIRCUIT SHORTED TO VOLTAGE Turn the ignition off. Disconnect the C1 PCM harness connector. Disconnect all the Sensors that share the (F856) Auxiliary 5-Volt Supply circuit. Ignition on, engine not running. Measure the voltage on the (F856) Auxiliary 5-Volt Supply circuit at the CMP Sensor harness connector. Is there any voltage present? Yes Repair the short to voltage in the (F856) Auxiliary 5-Volt Supply circuit. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/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. (F856) AUXILIARY 5-VOLT SUPPLY CIRCUIT OPEN Turn the ignition off. Reconnect all the sensors that were disconnected in the previous step except the CMP Sensor 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. Measure the resistance in the (F856) Auxiliary 5-Volt Supply circuit from the Sensor harness connector to the appropriate terminal of PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position). It may be necessary to perform this test from every sensor that uses the (F856) Auxiliary 5-Volt Supply circuit. Is the resistance below 5.0 Ohms? Yes Go To 7 . No Repair the open in the (F856) Auxiliary 5-Volt Supply circuit. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-intermittent-condition-pcmecm-reprogramming-gas-powertrain-verification-test-pre-diagnostic-troubleshooting-proc) .
7. 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»(/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»(/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:
• PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE
• MODULE, STEERING COLUMN, REMOVAL
• SWITCH, SPEED CONTROL, REMOVAL
• GENERATOR, REMOVAL
• STANDARD PROCEDURE
• STANDARD PROCEDURE
• RELAY, AUTO SHUT DOWN, DESCRIPTION
• FUSE LOCATIONS AND TYPES, SPECIFICATIONS
• PICK-UP, OIL PUMP, REMOVAL
• SWITCH, STOP LAMP, DESCRIPTION
• SENSOR, COOLANT TEMPERATURE, REMOVAL
• SENSOR, AIR TEMPERATURE, INTAKE, REMOVAL
• SOLENOID, MULTIPLE DISPLACEMENT, REMOVAL, 5.7L
• 3.6L ENGINE, DESCRIPTION
• 5.7L ENGINE, DESCRIPTION