3.6l & 5.7l - Dtcs p1696 to p2323 Jeep Grand Cherokee WK2

P1696-EEPROM MEMORY WRITE DENIED/INVALID

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

WHEN MONITORED

Continuously with the ignition on.

SET CONDITION

An attempt to program/write to the internal EEPROM failed, Also checks at power down. One Trip Fault. Three good trips to turn off the MIL.

POSSIBLE CAUSES

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

DIAGNOSTIC TEST

1. DTC IS ACTIVE NOTE: Diagnose and repair any other DTCs set in the PCM before proceeding with this test. Turn the ignition on. With the scan tool, Clear DTCs. 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 can 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. PCM ODOMETER MILEAGE NOT PROGRAMMED Turn the ignition on. With the scan tool, attempt to perform the Program PCM Odometer function under the PCM/ECM REPROGRAMMING Procedure. 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) . With the scan tool, clear DTCs. Start the engine. Allow the engine to reach normal operating temperature. With the scan tool, select View DTCs. Is the status Active for this DTC? Yes Go To 3 . No The SRI 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) .
3. CHECKING THE PCM POWER AND GROUND CIRCUITS Perform the diagnostic procedure for CHECKING THE PCM POWER AND GROUND CIRCUITS. Refer to «CHECKING THE PCM POWER AND GROUND CIRCUITS»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#driveability-gas-non-dtc-based-diagnostics__checking-the-pcm-power-and-ground) . Using the wiring diagram/schematic as a guide, inspect the Powertrain Control Module (PCM) wiring and connectors. Look for any chafed, pierced, pinched or partially broken wires. Look for broken, bent, pushed out or corroded terminals. Perform any Technical Service Bulletins that may apply. Were any problems found? Yes Repair as necessary. Perform the 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. POWERTRAIN CONTROL MODULE (PCM) Turn the ignition on. With the scan tool, attempt to perform the Program PCM Odometer function under the PCM/ECM REPROGRAMMING Procedure. 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) . With the scan tool, Clear DTCs. Start the engine. Allow the engine to reach normal operating temperature. With the scan tool, select View DTCs. Is the DTC Active at this time? Yes 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) . No The SRI 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) .

P1697-EMR (SRI) MILEAGE NOT STORED

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

Continuously with the ignition on.

The PCM Odometer mileage has not been programmed into the PCM.

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

1. PCM ODOMETER MILEAGE NOT PROGRAMMED Turn the ignition on. With the scan tool, attempt to perform the Program PCM Odometer function under the PCM/ECM REPROGRAMMING Procedure. 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) . Using the scan tool, clear DTCs. Start the engine. Allow the engine to reach normal operating temperature. With the scan tool, select View DTCs. Is the DTC Active at this time? 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 SRI 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) .

P1718-EEPROM INTEGRITY FAILURE

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

Continuously with the ignition on.

An attempt to program/write to the internal EEPROM failed, Also checks at power down. 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. DTC IS ACTIVE NOTE: Diagnose and repair any other DTCs set in the PCM before proceeding with this test. Turn the ignition on. With the scan tool, clear DTCs. 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. 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. PCM ODOMETER MILEAGE NOT PROGRAMMED Turn the ignition on. With the scan tool, attempt to perform the Program PCM Odometer function. With the scan tool, Clear DTCs. Start the engine. Allow the engine to reach normal operating temperature. With the scan tool, select View DTCs. Is the status Active for this DTC? Yes Go To 3 . No The SRI 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) .
3. CHECKING THE PCM POWER AND GROUND CIRCUITS Perform the CHECKING THE PCM POWER AND GROUND CIRCUITS diagnostic procedure. Refer to «CHECKING THE PCM POWER AND GROUND CIRCUITS»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#driveability-gas-non-dtc-based-diagnostics__checking-the-pcm-power-and-ground) . Using the wiring diagram/schematic as a guide, inspect the Powertrain Control Module (PCM) wiring and connectors. Look for any chafed, pierced, pinched or partially broken wires. Look for broken, bent, pushed out or corroded terminals. Perform any Technical Service Bulletins that may apply. Were any problems found? Yes Repair as necessary. Perform the 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. POWERTRAIN CONTROL MODULE (PCM) Turn the ignition on. With the scan tool, attempt to perform the Program PCM Odometer function. With the scan tool, Clear DTCs. Start the engine. Allow the engine to reach normal operating temperature. With the scan tool, select View DTCs. Is the DTC Active at this time? Yes 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) . No The SRI 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) .

Scheme 380

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

THEORY OF OPERATION

The fuel level sensor information is a bussed message to the Powertrain Control Module (PCM) from the Totally Integrated Power Module (TIPM). The fuel level rationality will set a fault for a fuel level reading that does not change over an accumulated mileage threshold to keep stuck high or stuck low fuel levels from disabling OBD monitors. If the vehicle is fitted with a saddle tank fuel system this feature includes diagnostics for both of the sending units and diagnostics for a siphon tube that has become disconnected or plugged. The power up test looks to see a large enough fuel level voltage change from the last key-off to the following engine run. The engine run test looks to see a fuel level voltage change over an accumulated mileage.

Vehicles fitted with saddle fuel tank configurations have two fuel level sending units. The primary side of the tank has the filler tube inlet near the bottom and contains the fuel pump module. During fuel tank fills, fuel must overflow the primary side to reach the secondary side of the tank. As fuel is consumed, a siphon tube is used to draw fuel from the secondary side to the primary side. Because the siphon tube flow rate exceeds the fuel consumption rate, the secondary side of the tank will be empty before fuel is depleted from the primary side. Fuel level sensor 1 is located on the primary side of the tank. Fuel level sensor 2 is located on the secondary side of the tank.

With engine run time greater than three minutes and Fuel Level Sensor 1 reading high.

The Powertrain Control Module (PCM) detects no change in Fuel Level Sensor 2 circuit voltage after a significant amount of fuel should have been consumed based on a calculated value and the vehicle operating conditions.

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

1. ACTIVE DTC NOTE: Diagnose and repair any Can bus, communication or implausible signal DTCs before proceeding with this test. NOTE: Diagnose DTC «P2067»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-dtcs-p1696-to-p2323__p2067-fuel-level-sensor-2-circuit-low) or «P2068»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#36l-57l-dtcs-p1696-to-p2323__p2068-fuel-level-sensor-2-circuit-high) first, if set along with P2066. Start the engine. Allow the engine to reach normal operating temperature. With the scan tool, select View 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. VISUALLY INSPECT FUEL TANK Visually inspect the Fuel Tank for damage that may restrict the Fuel Sending Unit float from moving. Is the Fuel Tank OK? Yes Go To 3 . No Replace the Fuel Tank 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. FUEL LEVEL SENSOR CIRCUIT DTCS SET IN THE TIPM Are any Fuel Level Sensor Circuit DTCs set in the TIPM? Yes Diagnose the appropriate Fuel Level Sensor Circuit DTC in the TIPM. Refer to «DIAGNOSTIC CODE INDEX»(/jeep/grand-cherokee/wk2-2010-2013/remont/communication-devices/#totally-integrated-power-module-tipm-diagnostic-code-index) . No Go To 4 .
4. INTERNAL INSPECTION OF THE FUEL TANK 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. Remove the Fuel Tank in accordance with the Service Information. Refer to «TANK, FUEL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . Remove the Fuel Pump Module. Refer to «MODULE, FUEL PUMP, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . Visually inspect the inside of the Fuel Tank for any obstructions or deformities. Inspect the Fuel Pump Module Float arm for damage. Were any problems found? Yes Repair or replace 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 5 .
5. 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 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) .

P2067-FUEL LEVEL SENSOR 2 CIRCUIT LOW

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

The fuel level sensor information is a bussed message to the Powertrain Control Module (PCM) from the Totally Integrated Power Module (TIPM). Vehicles fitted with saddle fuel tank configurations have two fuel level sending units. The primary side of the tank has the filler tube inlet near the bottom and contains the fuel pump module. During fuel tank fills, fuel must overflow the primary side to reach the secondary side of the tank. As fuel is consumed, a siphon tube is used to draw fuel from the secondary side to the primary side. Because the siphon tube flow rate exceeds the fuel consumption rate, the secondary side of the tank will be empty before fuel is depleted from the primary side. Fuel level sensor 1 is located on the primary side of the tank. Fuel level sensor 2 is located on the secondary side of the tank.

With the ignition on and battery voltage greater than 10.4 Volts.

The Fuel Level Sensor 2 input voltage is below the minimum acceptable value.

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

1. ACTIVE DTC NOTE: Diagnose and repair any Can bus, communication or implausible signal DTCs before proceeding with this test. Start the engine. Allow the engine to reach normal operating temperature. With the scan tool, select View 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. VISUALLY INSPECT FUEL TANK Visually inspect the Fuel Tank for damage that may restrict the Fuel Sending Unit float from moving. Is the Fuel Tank OK? Yes Go To 3 . No Replace the Fuel Tank 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. FUEL LEVEL SENSOR CIRCUIT DTCS SET IN THE TIPM Are any Fuel Level Sensor Circuit DTCs set in the TIPM? Yes Diagnose the appropriate Fuel Level Sensor Circuit DTC in the TIPM. Refer to «DIAGNOSTIC CODE INDEX»(/jeep/grand-cherokee/wk2-2010-2013/remont/communication-devices/#totally-integrated-power-module-tipm-diagnostic-code-index) . No Go To 4 .
4. INTERNAL INSPECTION OF THE FUEL TANK 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. Remove the Fuel Tank in accordance with the Service Information. Refer to «TANK, FUEL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . Remove the Fuel Pump Module. Refer to «MODULE, FUEL PUMP, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . Visually inspect the inside of the Fuel Tank for any obstructions or deformities. Inspect the Fuel Pump Module Float arm for damage. Were any problems found? Yes Repair or replace 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 5 .
5. 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 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) .

P2068-FUEL LEVEL SENSOR 2 CIRCUIT HIGH

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

With the ignition on and battery voltage greater than 10.4 Volts.

The Fuel Level Sensor 2 input voltage is above the maximum acceptable value.

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

1. ACTIVE DTC NOTE: Diagnose and repair any Can bus, communication or implausible signal DTCs before proceeding with this test. Start the engine. Allow the engine to reach normal operating temperature. With the scan tool, select View 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. VISUALLY INSPECT FUEL TANK Visually inspect the Fuel Tank for damage that may restrict the Fuel Sending Unit float from moving. Is the Fuel Tank OK? Yes Go To 3 . No Replace the Fuel Tank 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. FUEL LEVEL SENSOR CIRCUIT DTCS SET IN THE TIPM Are any Fuel Level Sensor Circuit DTCs set in the TIPM? Yes Diagnose the appropriate Fuel Level Sensor Circuit DTC in the TIPM. Refer to «DIAGNOSTIC CODE INDEX»(/jeep/grand-cherokee/wk2-2010-2013/remont/communication-devices/#totally-integrated-power-module-tipm-diagnostic-code-index) . No Go To 4 .
4. INTERNAL INSPECTION OF THE FUEL TANK 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. Remove the Fuel Tank in accordance with the Service Information. Refer to «TANK, FUEL, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . Remove the Fuel Pump Module. Refer to «MODULE, FUEL PUMP, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . Visually inspect the inside of the Fuel Tank for any obstructions or deformities. Inspect the Fuel Pump Module Float arm for damage. Were any problems found? Yes Repair or replace 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 5 .
5. 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 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 381

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

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.

Ignition on.

The PCM recognizes the Throttle plate is stuck during extremely cold Ambient Temperature operation. The throttle plate goes through a de-icing procedure. If the throttle blade still doesn't move this fault sets. The MIL will not illuminate. The vehicle will be in Limp home condition, limiting RPM and vehicle speed.

1. THROTTLE BODY INSPECTION Ignition on, engine not running. With the scan tool, select View DTCs and record the related Freeze Frame data. NOTE: This DTC sets in extreme cold Ambient Temperatures with the throttle plate stuck by the time the vehicle gets to the dealership the condition may be corrected. NOTE: P2110 will set with P2072. P2118 may also set and the customer will experience a Limp-in condition. If either of these two faults are set, it indicates that the ice blockage software has run and no repair is necessary. NOTE: Diagnose any other DTCs that may also be set before continuing. Turn the ignition off. Remove the Air Cleaner Assembly from the Throttle Body. Refer to «BODY, AIR CLEANER, REMOVAL, 3.6L»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) , or «BODY, AIR CLEANER, REMOVAL, 5.7L»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#57l-engine-service-information) . Check for any signs of a foreign material (ice or dirt) on the Throttle Plate or in the bore causing the Throttle Plate to stick. Is the throttle blade still stuck because it is frozen? Yes Allow the Throttle Body to thaw naturally in a room temperature climate. 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 382

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

The Oxygen sensors (O2 sensor) are used for fuel control and catalyst monitoring. Each O2 sensor compares the oxygen content of the surrounding air with the oxygen content of the exhaust stream. When the engine is started, the Powertrain Control Module (PCM) operates in an Open Loop mode, ignoring the O2 sensor signal voltage while calculating the air-to-fuel ratio. The heating elements inside each O2 sensor heat the sensor to bring the sensor up to operating conditions faster. This allows the system to enter Closed Loop earlier and the PCM to calculate the air-to-fuel ratio sooner. While the engine runs, the O2 sensor heats up and begins to generate a voltage within a range of 0-1, 275 mV. Once sufficient O2 sensor voltage fluctuation is observed by the PCM, Closed Loop is entered. The PCM uses the O2 sensor voltage to determine the air-to-fuel ratio. An O2 sensor voltage that increases toward 1, 000 mV indicates a rich fuel mixture. An O2 sensor voltage that decreases toward 0 mV indicates a lean fuel mixture.

With the engine running in closed loop mode, the ambient/battery temperature above -6.7° C (20° F) and altitude below 2590.8 m (8500 ft).

The conditions that cause this diagnostic to fail is when the upstream O2 sensor becomes biased from an exhaust leak, O2 sensor contamination or some other extreme operating condition. The downstream O2 sensor is considered to be protected from extreme environments by the catalyst. The PCM monitors the downstream O2 sensor feedback control, called downstream fuel trim, to detect any shift in the upstream O2 sensor target voltage from nominal target voltage. The value of the downstream fuel trim is compared with the lean thresholds. Every time the value exceeds the calibrated threshold, a fail timer is incremented and mass flow through the exhaust is accumulated. If the fail timer and accumulated mass flow exceed the fail thresholds, the test fails and the diagnostic stops running for that trip. If the test fails on consecutive trips, a DTC is set.

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

1. ACTIVE DIAGNOSTIC TROUBLE CODE (DTC) NOTE: Check the vehicle repair history. If the 1/2 O2 has been replaced make sure that the O2 sensor was properly installed and meets OEM specification. NOTE: Check for contaminants that may have damaged the 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 THE EXHAUST SYSTEM FOR LEAKS NOTE: A thorough exhaust leak test must be completed before removing an O2 Sensor or any other part from the exhaust system. Do not remove any parts before an exhaust leak check has been completed. NOTE: An exhaust leak may cause downstream fuel adaptives to rail out, resulting in a false O2 Sensor failure 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. CHECKING THE FUEL DELIVERY SYSTEM Perform the diagnostic procedure for CHECKING THE FUEL DELIVERY SYSTEM. Refer to «CHECKING THE FUEL DELIVERY SYSTEM»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#driveability-gas-non-dtc-based-diagnostics__checking-the-fuel-delivery-system) . Were any problems found? Yes Repair as necessary 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 4 .
4. CHECKING THE OXYGEN SENSOR OPERATION Perform the diagnostic procedure for CHECKING THE OXYGEN SENSOR OPERATION. Refer to «CHECKING THE OXYGEN SENSOR OPERATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#driveability-gas-non-dtc-based-diagnostics__checking-the-oxygen-sensor-operation) . Were any problems found? Yes Repair as necessary 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 5 .
5. ENGINE MECHANICAL 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 6 .
6. POWERTRAIN CONTROL MODULE (PCM) Using the wiring diagram/schematic as a guide, inspect the wiring and connectors relative to the components tested in this procedure. Look for any chafed, pierced, pinched or partially broken wires. Look for broken, bent, pushed out or corroded terminals. Monitor the scan tool data relative to the components tested in this procedure and wiggle test the wiring and connectors. Look for the data to change or for a DTC to set during the wiggle test. 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 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) .

P2097-DOWNSTREAM FUEL TRIM SYSTEM 1 RICH

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

The Oxygen sensors (O2 sensor) are used for fuel control and catalyst monitoring. Each O2 sensor compares the oxygen content of the surrounding air with the oxygen content of the exhaust stream. When the engine is started, the Powertrain Control Module (PCM) operates in an Open Loop mode, ignoring the O2 sensor signal voltage while calculating the air-to-fuel ratio. The heating elements inside each O2 sensor heat the sensor to bring the sensor up to operating conditions faster. This allows the system to enter Closed Loop earlier and the PCM to calculate the air-to-fuel ratio sooner. While the engine runs, the O2 sensor heats up and begins to generate a voltage within a range of 0-1, 275 mV. Once sufficient O2 sensor voltage fluctuation is observed by the PCM, Closed Loop is entered. The PCM uses the O2 sensor voltage to determine the air-to-fuel ratio. An O2 sensor voltage that increases toward 1, 000 mV indicates a rich fuel mixture. An O2 sensor voltage that decreases toward 0 mV indicates a lean fuel mixture.

With the engine running in closed loop mode, the ambient/battery temperature above -6.7° C (20° F) and altitude below 2590.8 m (8500 ft).

The conditions that cause this diagnostic to fail is when the upstream O2 sensor becomes biased from an exhaust leak, O2 sensor contamination or some other extreme operating condition. The downstream O2 sensor is considered to be protected from extreme environments by the catalyst. The PCM monitors the downstream O2 sensor feedback control, called downstream fuel trim, to detect any shift in the upstream O2 sensor target voltage from nominal target voltage. The value of the downstream fuel trim is compared with the rich thresholds. Every time the value exceeds the calibrated threshold, a fail timer is incremented and mass flow through the exhaust is accumulated. If the fail timer and accumulated mass flow exceed the fail thresholds, the test fails and the diagnostic stops running for that trip. If the test fails on consecutive trips, a DTC is set.

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

1. ACTIVE DIAGNOSTIC TROUBLE CODE (DTC) NOTE: Check the vehicle repair history. If the 1/2 O2 has been replaced make sure that the O2 sensor was properly installed and meets OEM specification. NOTE: Check for contaminants that may have damaged the 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 THE EXHAUST SYSTEM FOR LEAKS NOTE: A thorough exhaust leak test must be completed before removing an O2 Sensor or any other part from the exhaust system. Do not remove any parts before an exhaust leak check has been completed. NOTE: An exhaust leak may cause downstream fuel adaptives to rail out, resulting in a false O2 Sensor failure 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. CHECKING THE FUEL DELIVERY SYSTEM Perform the diagnostic procedure for CHECKING THE FUEL DELIVERY SYSTEM. Refer to «CHECKING THE FUEL DELIVERY SYSTEM»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#driveability-gas-non-dtc-based-diagnostics__checking-the-fuel-delivery-system) . Were any problems found? Yes Repair as necessary 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 4 .
4. CHECKING THE OXYGEN SENSOR OPERATION Perform the diagnostic procedure for CHECKING THE OXYGEN SENSOR OPERATION. Refer to «CHECKING THE OXYGEN SENSOR OPERATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#driveability-gas-non-dtc-based-diagnostics__checking-the-oxygen-sensor-operation) . Were any problems found? Yes Repair as necessary 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 5 .
5. ENGINE MECHANICAL 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 6 .
6. POWERTRAIN CONTROL MODULE (PCM) Using the wiring diagram/schematic as a guide, inspect the wiring and connectors relative to the components tested in this procedure. Look for any chafed, pierced, pinched or partially broken wires. Look for broken, bent, pushed out or corroded terminals. Monitor the scan tool data relative to the components tested in this procedure and wiggle test the wiring and connectors. Look for the data to change or for a DTC to set during the wiggle test. 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 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 383

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

The Oxygen sensors (O2 sensor) are used for fuel control and catalyst monitoring. Each O2 sensor compares the oxygen content of the surrounding air with the oxygen content of the exhaust stream. When the engine is started, the Powertrain Control Module (PCM) operates in an Open Loop mode, ignoring the O2 sensor signal voltage while calculating the air-to-fuel ratio. The heating elements inside each O2 sensor heat the sensor to bring the sensor up to operating conditions faster. This allows the system to enter Closed Loop earlier and the PCM to calculate the air-to-fuel ratio sooner. While the engine runs, the O2 sensor heats up and begins to generate a voltage within a range of 0-1, 275 mV. Once sufficient O2 sensor voltage fluctuation is observed by the PCM, Closed Loop is entered. The PCM uses the O2 sensor voltage to determine the air-to-fuel ratio. An O2 sensor voltage that increases toward 1, 000 mV indicates a rich fuel mixture. An O2 sensor voltage that decreases toward 0 mV indicates a lean fuel mixture.

With the engine running in closed loop mode, the ambient/battery temperature above -6.7° C (20° F) and altitude below 2590.8 m (8500 ft). Fuel level greater than 15%.

The conditions that cause this diagnostic to fail is when the upstream O2 sensor becomes biased from an exhaust leak, O2 sensor contamination or some other extreme operating condition. The downstream O2 sensor is considered to be protected from extreme environments by the catalyst. The PCM monitors the downstream O2 sensor feedback control, called downstream fuel trim, to detect any shift in the upstream O2 sensor target voltage from nominal target voltage. The value of the downstream fuel trim is compared with the lean thresholds. Every time the value exceeds the calibrated threshold, a fail timer is incremented and mass flow through the exhaust is accumulated. If the fail timer and accumulated mass flow exceed the fail thresholds, the test fails and the diagnostic stops running for that trip. If the test fails on consecutive trips, a DTC is set.

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

1. ACTIVE DIAGNOSTIC TROUBLE CODE (DTC) NOTE: Check the vehicle repair history. If the 2/2 O2 has been replaced make sure that the O2 sensor was properly installed and meets OEM specification. NOTE: Check for contaminants that may have damaged the 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 THE EXHAUST SYSTEM FOR LEAKS NOTE: A thorough exhaust leak test must be completed before removing an O2 Sensor or any other part from the exhaust system. Do not remove any parts before an exhaust leak check has been completed. NOTE: An exhaust leak may cause downstream fuel adaptives to rail out, resulting in a false O2 Sensor failure 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. CHECKING THE FUEL DELIVERY SYSTEM Perform the diagnostic procedure for CHECKING THE FUEL DELIVERY SYSTEM. Refer to «CHECKING THE FUEL DELIVERY SYSTEM»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#driveability-gas-non-dtc-based-diagnostics__checking-the-fuel-delivery-system) . Were any problems found? Yes Repair as necessary 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 4 .
4. CHECKING THE OXYGEN SENSOR OPERATION Perform the diagnostic procedure for CHECKING THE OXYGEN SENSOR OPERATION. Refer to «CHECKING THE OXYGEN SENSOR OPERATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#driveability-gas-non-dtc-based-diagnostics__checking-the-oxygen-sensor-operation) . Were any problems found? Yes Repair as necessary 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 5 .
5. ENGINE MECHANICAL 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 6 .
6. POWERTRAIN CONTROL MODULE (PCM) Using the wiring diagram/schematic as a guide, inspect the wiring and connectors relative to the components tested in this procedure. Look for any chafed, pierced, pinched or partially broken wires. Look for broken, bent, pushed out or corroded terminals. Monitor the scan tool data relative to the components tested in this procedure and wiggle test the wiring and connectors. Look for the data to change or for a DTC to set during the wiggle test. 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 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) .

P2099-DOWNSTREAM FUEL TRIM SYSTEM 2 RICH

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

The Oxygen sensors (O2 sensor) are used for fuel control and catalyst monitoring. Each O2 sensor compares the oxygen content of the surrounding air with the oxygen content of the exhaust stream. When the engine is started, the Powertrain Control Module (PCM) operates in an Open Loop mode, ignoring the O2 sensor signal voltage while calculating the air-to-fuel ratio. The heating elements inside each O2 sensor heat the sensor to bring the sensor up to operating conditions faster. This allows the system to enter Closed Loop earlier and the PCM to calculate the air-to-fuel ratio sooner. While the engine runs, the O2 sensor heats up and begins to generate a voltage within a range of 0-1, 275 mV. Once sufficient O2 sensor voltage fluctuation is observed by the PCM, Closed Loop is entered. The PCM uses the O2 sensor voltage to determine the air-to-fuel ratio. An O2 sensor voltage that increases toward 1, 000 mV indicates a rich fuel mixture. An O2 sensor voltage that decreases toward 0 mV indicates a lean fuel mixture.

With the engine running in closed loop mode, the ambient/battery temperature above -6.7° C (20° F) and altitude below 2590.8 m (8500 ft).

The conditions that cause this diagnostic to fail is when the upstream O2 sensor becomes biased from an exhaust leak, O2 sensor contamination or some other extreme operating condition. The downstream O2 sensor is considered to be protected from extreme environments by the catalyst. The PCM monitors the downstream O2 sensor feedback control, called downstream fuel trim, to detect any shift in the upstream O2 sensor target voltage from nominal target voltage. The value of the downstream fuel trim is compared with the lean thresholds. Every time the value exceeds the calibrated threshold, a fail timer is incremented and mass flow through the exhaust is accumulated. If the fail timer and accumulated mass flow exceed the fail thresholds, the test fails and the diagnostic stops running for that trip. If the test fails on consecutive trips, a DTC is set.

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

1. ACTIVE DIAGNOSTIC TROUBLE CODE (DTC) NOTE: Check the vehicle repair history. If the 2/2 O2 has been replaced make sure that the O2 sensor was properly installed and meets OEM specification. NOTE: Check for contaminants that may have damaged the 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 THE EXHAUST SYSTEM FOR LEAKS NOTE: A thorough exhaust leak test must be completed before removing an O2 Sensor or any other part from the exhaust system. Do not remove any parts before an exhaust leak check has been completed. NOTE: An exhaust leak may cause downstream fuel adaptives to rail out, resulting in a false O2 Sensor failure 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. CHECKING THE FUEL DELIVERY SYSTEM Perform the diagnostic procedure for CHECKING THE FUEL DELIVERY SYSTEM. Refer to «CHECKING THE FUEL DELIVERY SYSTEM»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#driveability-gas-non-dtc-based-diagnostics__checking-the-fuel-delivery-system) . Were any problems found? Yes Repair as necessary 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 4 .
4. CHECKING THE OXYGEN SENSOR OPERATION Perform the diagnostic procedure for CHECKING THE OXYGEN SENSOR OPERATION. Refer to «CHECKING THE OXYGEN SENSOR OPERATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#driveability-gas-non-dtc-based-diagnostics__checking-the-oxygen-sensor-operation) . Were any problems found? Yes Repair as necessary 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 5 .
5. ENGINE MECHANICAL 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 6 .
6. POWERTRAIN CONTROL MODULE (PCM) Using the wiring diagram/schematic as a guide, inspect the wiring and connectors relative to the components tested in this procedure. Look for any chafed, pierced, pinched or partially broken wires. Look for broken, bent, pushed out or corroded terminals. Monitor the scan tool data relative to the components tested in this procedure and wiggle test the wiring and connectors. Look for the data to change or for a DTC to set during the wiggle test. 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 384

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

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.

With the ignition on and the ETC Motor is not in Limp Home mode.

When the Powertrain Control Module (PCM) detects an internal error or a short between the ETC Motor - and ETC Motor + circuits in the ETC Motor Driver. One trip fault. ETC light is flashing.

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

Scheme 385

Scheme 386

Scheme 387

Scheme 388

Scheme 389

Scheme 390

Scheme 391

1. ACTIVE DIAGNOSTIC TROUBLE CODE (DTC) Ignition on, engine not running. NOTE: If the P2100 is intermittent, it is possible that the controller is overheating in extreme hot temperatures and this is considered a normal protection operation. No repair is necessary. NOTE: Low battery voltage can also cause excessive current draw, in very hot and very cold ambient temperatures. Make sure the battery can pass a load test before continuing. With the scan tool, read the active DTCs. Look closely at the temperatures at which this DTC set. 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. THROTTLE PLATE INSPECTION Turn the ignition off. Remove the Air Cleaner Assembly from the Throttle Body. Refer to «BODY, AIR CLEANER, REMOVAL, 3.6L»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) , or «BODY, AIR CLEANER, REMOVAL, 5.7L»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#57l-engine-service-information) . Check for any signs of a foreign material (ice or dirt) on the Throttle Plate or in the bore causing the Throttle Plate to stick. Were any signs of foreign material or scoring of the throttle plate or bore found? Yes Remove the debris if possible or replace the Throttle Body Assembly. Refer to «THROTTLE BODY, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . Disconnect the Battery when replacing the Throttle Body Assembly. After installation is complete, use a scan tool and select the ETC RELEARN function. 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. (K124) ETC POSITIVE CIRCUIT SHORTED TO VOLTAGE Turn the ignition off. Disconnect the Throttle Body harness connector. Disconnect the C2 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 the diagnostics. Ignition on, engine not running. Measure the voltage on the (K124) ETC Positive circuit at 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 on the (K124) ETC Positive 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. (K126) ETC NEGATIVE CIRCUIT SHORTED TO VOLTAGE Measure the voltage on the (K126) ETC Negative circuit at 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 (K126) ETC Negative 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. (K124) ETC POSITIVE CIRCUIT SHORTED TO THE (K126) ETC NEGATIVE CIRCUIT Turn the ignition off. Measure the resistance between the (K124) ETC Positive circuit and the (K126) ETC Negative circuit at the appropriate terminals of PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position). Is the resistance below 100 Ohms? Yes Repair the short to between the (K124) ETC Positive circuit and the (K126) ETC Negative 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. (K124) ETC POSITIVE CIRCUIT OPEN Measure the resistance of the (K124) ETC Positive circuit from the Throttle Body 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 open in the (K124) ETC Positive 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. (K124) ETC POSITIVE CIRCUIT SHORTED TO GROUND Measure the resistance between ground and the (K124) ETC Positive circuit between the appropriate terminals of PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position). Is the resistance below 100 Ohms? Yes Repair the short to ground in the (K124) ETC Positive 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. (K126) ETC NEGATIVE CIRCUIT OPEN Measure the resistance of the (K126) ETC Negative circuit from the Throttle Body 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 open in the (K126) ETC Negative 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. (K126) ETC NEGATIVE CIRCUIT SHORTED TO GROUND Measure the resistance between ground and the (K126) ETC Negative circuit using the appropriate terminal of PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position). Is the resistance below 100 Ohms? Yes Repair the short to ground in the (K126) ETC Negative 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 10 .
10. ETC MOTOR NOTE: Take the following measurement using PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position) to avoid possible damage to the Throttle Body harness connector. Connect the Throttle Body harness connector. Measure the resistance of the ETC Motor between the (K124) ETC Positive circuit and the (K126) ETC Negative circuit at the appropriate terminals of PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position). Is the resistance between 2.5 and 25 Ohms at closed throttle? Yes Go To 11 . No Replace the Throttle Body Assembly. Refer to «THROTTLE BODY, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . Disconnect the Battery when replacing the Throttle Body Assembly. After installation is complete, use a scan tool and select the ETC RELEARN function. 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 Throttle Body 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 Throttle Body 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) .

P2101-ELECTRONIC THROTTLE CONTROL MOTOR PERFORMANCE

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

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.

With the vehicle running, ETC Motor not in Limp Home mode and the TPS adaptation is complete.

The Powertrain Control Module (PCM) recognizes too large of an error between the actual position of the Throttle Plate and the Set Point position. One trip fault and the code will set within five seconds. Three good trips to turn off the MIL 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: When this DTC is Active the engine speed, torque and vehicle speed are limited to a Limp in mode. NOTE: Before continuing visually inspect the throttle blade and bore for any obstructions. Icing of the throttle body may have caused this code to set. NOTE: Low battery voltage can also cause excessive current draw, in very hot and very cold ambient temperature. Make sure the battery can pass a load test before continuing. NOTE: Diagnose any 5 Volt Supply, Battery and TP Sensor DTCs before continuing. Ignition on, engine not running. With 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. THROTTLE PLATE INSPECTION Turn the ignition off. Remove the Air Cleaner Assembly from the Throttle Body. Refer to «BODY, AIR CLEANER, REMOVAL, 3.6L»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) , or «BODY, AIR CLEANER, REMOVAL, 5.7L»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#57l-engine-service-information) . Check for any signs of a foreign material (ice or dirt) on the Throttle Plate or in the bore causing the Throttle Plate to stick. Were any problems found? Yes Remove the debris if possible or replace the Throttle Body Assembly. Refer to «THROTTLE BODY, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . Disconnect the Battery when replacing the Throttle Body Assembly. After installation is complete, use a scan tool and select the ETC RELEARN function. 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. THROTTLE POSITION WITHIN 2° DEGREES OF DESIRED THROTTLE POSITION Start the engine. Allow the engine to reach normal operating temperature. With the scan tool, monitor the Actual Throttle Position and Desired Throttle Position. Compare the Actual Throttle Position and the Set Point Throttle Position. Is the Actual Throttle Position within 2° degrees of the Desired Throttle Position? Yes Go To 4 . No Replace the Throttle Body Assembly. Refer to «THROTTLE BODY, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . Disconnect the Battery when replacing the Throttle Body Assembly. After installation is complete, use a scan tool and select the ETC RELEARN function. 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. ETC OPERATION Ignition on, engine not running. With the scan tool, perform the ETC Throttle Follower Test. NOTE: It may be necessary to use a mirror to see the throttle blade. Observe the throttle blade. NOTE: Make sure the motion of the throttle blade is smooth and that it opens and closes. Did the ETC motor operate 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 Replace the Throttle Body Assembly. Refer to «THROTTLE BODY, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . Disconnect the Battery when replacing the Throttle Body Assembly. After installation is complete, use a scan tool and select the ETC RELEARN function. 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) .

P2107-ELECTRONIC THROTTLE CONTROL MODULE PROCESSOR

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

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.

With the ignition on and the ETC Motor is not in Limp Home mode.

When the Powertrain Control Module (PCM) detects an internal error or a short between the ETC Motor - and ETC Motor + circuits in the ETC Motor Driver. One trip fault. ETC light is flashing.

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

1. ACTIVE DTC NOTE: Diagnose and repair P2100-ELECTRONIC THROTTLE CONTROL CIRCUIT if set with P2107-ELECTRONIC THROTTLE CONTROL MODULE PROCESSOR DTC before continuing. Check for any related TSBs. 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. Flash the Powertrain Control Module in accordance with the Service Information if any updates are available. Start the engine. Allow the engine to reach normal operating temperature. Operate the accelerator pedal. (do not exceed 3500 RPM) Test drive the vehicle for 10 miles on a flat road surface. NOTE: Diagnose and repair DTC P2100-ELECTRONIC THROTTLE CONTROL CIRCUIT before continuing. Did DTC P2107-ELECTRONIC THROTTLE CONTROL MODULE PROCESSOR set 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. THROTTLE PLATE INSPECTION Turn the ignition off. Remove the Air Cleaner Assembly from the Throttle Body. Check for any signs of a foreign material (ice or dirt) on the Throttle Plate or in the bore causing the Throttle Plate to stick. Were any signs of foreign material or scoring of the throttle plate or bore found? Yes Remove the debris if possible or replace the Throttle Body Assembly. Refer to «THROTTLE BODY, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . Disconnect the Battery when replacing the Throttle Body Assembly. After installation is complete, use a scan tool and select the ETC RELEARN function. 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. (K124) ETC POSITIVE CIRCUIT SHORTED TO VOLTAGE Turn the ignition off. Disconnect the Throttle Body harness connector. Disconnect the C2 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 the diagnostics. Ignition on, engine not running. Measure the voltage on the (K124) ETC Positive circuit at 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 on the (K124) ETC Positive 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. (K126) ETC NEGATIVE CIRCUIT SHORTED TO VOLTAGE Measure the voltage on the (K126) ETC Negative circuit at 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 (K126) ETC Negative 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. (K124) ETC POSITIVE CIRCUIT SHORTED TO THE (K126) ETC NEGATIVE CIRCUIT Turn the ignition off. Measure the resistance between the (K124) ETC Positive circuit and the (K126) ETC Negative circuit at the appropriate terminals of PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position). Is the resistance below 100 Ohms? Yes Repair the short to between the (K124) ETC Positive circuit and the (K126) ETC Negative 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. (K124) ETC POSITIVE CIRCUIT OPEN Measure the resistance of the (K124) ETC Positive circuit from the Throttle Body 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 open in the (K124) ETC Positive 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. (K124) ETC POSITIVE CIRCUIT SHORTED TO GROUND Measure the resistance between ground and the (K124) ETC Positive circuit between the appropriate terminals of PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position). Is the resistance below 100 Ohms? Yes Repair the short to ground in the (K124) ETC Positive 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. (K126) ETC NEGATIVE CIRCUIT OPEN Measure the resistance of the (K126) ETC Negative circuit from the Throttle Body 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 open in the (K126) ETC Negative 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. (K126) ETC NEGATIVE CIRCUIT SHORTED TO GROUND Measure the resistance between ground and the (K126) ETC Negative circuit using the appropriate terminal of PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position). Is the resistance below 100 Ohms? Yes Repair the short to ground in the (K126) ETC Negative 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 10 .
10. ETC MOTOR NOTE: Take the following measurement using PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position) to avoid possible damage to the Throttle Body harness connector. Connect the Throttle Body harness connector. Measure the resistance of the ETC Motor between the (K124) ETC Positive circuit and the (K126) ETC Negative circuit at the appropriate terminals of PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position). Is the resistance between 2.5 and 25 Ohms at closed throttle? Yes Go To 11 . No Replace the Throttle Body Assembly. Refer to «THROTTLE BODY, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . Disconnect the Battery when replacing the Throttle Body Assembly. After installation is complete, use a scan tool and select the ETC RELEARN function. 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 Throttle Body 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 Throttle Body 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) .

P2110-ELECTRONIC THROTTLE CONTROL - FORCED LIMITED RPM

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

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.

Ignition on and ETC motor is working.

When the Powertrain Control Module (PCM) requests to limit engine speed if PWM is too high for 20.5 seconds and before P2118 sets. One trip fault and the code will set within five seconds. ETC light is illuminated.

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

Scheme 392

Scheme 393

Scheme 394

1. ACTIVE DIAGNOSTIC TROUBLE CODE (DTC) NOTE: When this DTC is Active the engine speed, torque and vehicle speed are limited to a Limp in mode. Ignition on, engine not running. With the scan tool, read the active DTCs. In the Freeze Frame data, look at the temperature at which the fault occurred. If it occurred in extreme cold temperatures, Icing of the throttle body may have caused this code to set. NOTE: Diagnose any TP Sensor faults, 5 Volt Supply faults and Battery voltage High or Low DTCs before continuing. NOTE: If P2072 is also set, this indicates that the cold weather ice blockage routine has run. No repair action is required. 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. THROTTLE PLATE STUCK Turn the ignition off. Remove the Air Cleaner Assembly from the Throttle Body. Refer to «BODY, AIR CLEANER, REMOVAL, 3.6L»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) , or «BODY, AIR CLEANER, REMOVAL, 5.7L»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#57l-engine-service-information) . Check for any signs of a foreign material (ice or dirt) causing the Throttle to stick. Were any problems found? Yes Remove the debris if possible or replace the Throttle Body Assembly if signs of physical damage are present. Refer to «THROTTLE BODY, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . Disconnect the Battery when replacing the Throttle Body Assembly. After installation is complete, use a scan tool and select the ETC RELEARN function. 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. (K124) ETC POSITIVE CIRCUIT OPEN Turn the ignition off. Disconnect the Throttle Body harness connector. Disconnect the C2 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 (K124) ETC Positive circuit from the Throttle Body 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 4 . No Repair the open in the (K124) ETC Positive 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. (K126) ETC NEGATIVE CIRCUIT OPEN Measure the resistance of the (K126) ETC Negative circuit from the Throttle Body 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 (K126) ETC Negative 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. (K124) ETC POSITIVE CIRCUIT SHORTED TO GROUND Measure the resistance between a known good ground and the (K124) ETC Positive circuit at the appropriate terminal of PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position). Is the resistance below 100 Ohms? Yes Repair the short to ground in the (K124) ETC Positive 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. (K126) ETC NEGATIVE CIRCUIT SHORTED TO GROUND Measure the resistance between a known good ground and the (K126) ETC Negative circuit at the appropriate terminal of PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position). Is the resistance below 100 Ohms? Yes Repair the short to ground in the (K126) ETC Negative 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. ETC MOTOR NOTE: Take the following measurement using PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position) to avoid possible damage to the Throttle Body harness connector. Measure the resistance of the ETC Motor between the (K124) ETC Positive circuit and the (K126) ETC Negative circuit at the appropriate terminals of PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position). Is the resistance between 2.5 and 25 Ohms at closed throttle? Yes Go To 8 . No Remove the debris if possible or replace the Throttle Body Assembly if signs of physical damage are present. Refer to «THROTTLE BODY, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . Disconnect the Battery when replacing the Throttle Body Assembly. After installation is complete, use a scan tool and select the ETC RELEARN function. 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 Throttle Body 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 Throttle Body 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) .

P2111-ELECTRONIC THROTTLE CONTROL - UNABLE TO CLOSE

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

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.

Ignition on and battery voltage greater than 10 Volts.

Just after key on, the throttle is opened and closed to test the system. If the TP Sensor does not return to Limp Home Position at the end of this test, this DTC will set. One trip fault and the code will set within five seconds. ETC light is flashing.

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

Scheme 395

1. ACTIVE DIAGNOSTIC TROUBLE CODE (DTC) NOTE: Maximum engine speed could be reduced while this fault is active, it just depends where the throttle gets stuck. Ignition on, engine not running. NOTE: The PCM tests the ETC Motor by opening and closing the Throttle Plate before starting the engine. If during this test the Throttle plate does not return to the closed position this DTC sets. With a scan tool, read the active DTCs. NOTE: Diagnose any TP Sensor or 5-Volt Supply DTCs before continuing. 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. THROTTLE PLATE STUCK OPEN Turn the ignition off. NOTE: The PCM tests the ETC Motor by opening and closing the Throttle Plate before starting the engine. If during this test the Throttle plate does not return to the closed position this DTC sets. Remove the Air Cleaner Assembly from the Throttle Body. Refer to «BODY, AIR CLEANER, REMOVAL, 3.6L»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) , or «BODY, AIR CLEANER, REMOVAL, 5.7L»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#57l-engine-service-information) . Check for any signs of a foreign material causing the Throttle to remain open. Using a scan tool, under System Tests, perform the ETC Throttle Follower Test. Have an assistant watch the throttle plate to verify it moves during the test. Does the Throttle Plate move? Yes Go To 3 . No Remove the debris if possible or replace the Throttle Body Assembly if signs of physical damage are present. Refer to «THROTTLE BODY, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . Disconnect the Battery when replacing the Throttle Body Assembly. After installation is complete, use a scan tool and perform the ETC RELEARN function. 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. TP SENSOR NO. 1 AND TP SENSOR NO. 2 BOTH EQUAL 2.5 VOLTS With a scan tool, perform the ETC Throttle Follower test while reading both TP Sensor voltage readings. Are both TP Sensor readings stuck at 2.5 Volts? Yes Check the TP Sensor Signal circuits for excessive resistance, being shorted to each other, or shorted to the Sensor Return 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. (K124) ETC POSITIVE CIRCUIT SHORTED TO VOLTAGE Turn the ignition off. Disconnect the Throttle Body harness connector. Disconnect the C2 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 the diagnostics. Ignition on, engine not running. Measure the voltage on the (K124) ETC Positive circuit at 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 on the (K124) ETC Positive 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. (K124) ETC POSITIVE CIRCUIT OPEN Turn the ignition off. Measure the resistance of the (K124) ETC Positive circuit from the Throttle Body 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 (K124) ETC Positive 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. (K126) ETC NEGATIVE CIRCUIT OPEN Measure the resistance of the (K126) ETC Negative circuit from the Throttle Body 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 open in the (K126) ETC Negative 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. (K124) ETC POSITIVE CIRCUIT SHORTED TO GROUND Measure the resistance between a known good ground and the (K124) ETC Positive circuit at the appropriate terminal of PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position). Is the resistance below 100 Ohms? Yes Repair the short to ground in the (K124) ETC Positive 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. (K126) ETC NEGATIVE CIRCUIT SHORTED TO GROUND Measure the resistance between a known good ground and the (K126) ETC Negative circuit at the appropriate terminal of PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position). Is the resistance below 100 Ohms? Yes Repair the short to ground in the (K126) ETC Negative 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) Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Throttle Body 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 Throttle Body 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) .

P2112-ELECTRONIC THROTTLE CONTROL - UNABLE TO OPEN

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

The Electronic Throttle Control (ETC) system uses two Accelerator Pedal Position (APP) sensors to monitor the accelerator pedal position. The APP sensors 1 and 2 are located within the pedal assembly. Each sensor has a 5 Volt reference circuit, a low reference circuit and a signal circuit. Processors are also used to monitor the ETC system data. The processors are located within the Powertrain Control Module (PCM). Each signal circuit provides processors with a signal voltage proportional to pedal movement. The processors share and monitor data to verify that the indicated APP calculation is correct.

Ignition on and battery voltage greater than 10 Volts.

Just after key on, the throttle is opened and closed to test the system. If the TP Sensor does not return to Limp Home Position at the end of this test, this DTC will set. One trip fault and the code will set within five seconds. ETC light is flashing.

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

Scheme 396

1. ACTIVE DIAGNOSTIC TROUBLE CODE (DTC) Ignition on, engine not running. NOTE: The PCM tests the ETC Motor by opening and closing the Throttle Plate before starting the engine. If during this test the Throttle plate does not return to the closed position this DTC sets. With the scan tool, read the active DTCs. NOTE: Diagnose any TP Sensor, Battery voltage and 5 Volt Supply DTCs before continuing. 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. THROTTLE PLATE STUCK OPEN Turn the ignition off. NOTE: The PCM tests the ETC Motor by opening and closing the Throttle Plate before starting the engine. If during this test the Throttle plate does not open this DTC sets. Remove the Air Cleaner Assembly from the Throttle Body. Refer to «AIR CLEANER, REMOVAL, 3.6L»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#36l-engine-service-information) , or «AIR CLEANER, REMOVAL, 5.7L»(/jeep/grand-cherokee/wk2-2010-2013/remont/mechanical/#57l-engine-service-information) . Check for any signs of a foreign material causing the Throttle to remain open. Using a scan tool, under System Tests, perform the ETC Throttle Follower Test. Have an assistant watch the throttle plate to verify it moves during the test. Does the Throttle Plate move? Yes Go To 3 . No Remove the debris if possible or replace the Throttle Body Assembly. Refer to «THROTTLE BODY, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . Disconnect the Battery when replacing the Throttle Body Assembly. After installation is complete, use a scan tool and select the ETC RELEARN function. 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. (K126) ETC NEGATIVE CIRCUIT SHORTED TO VOLTAGE Turn the ignition off. Disconnect the Throttle Body harness connector. Disconnect the C2 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. Ignition on, engine not running. Measure the voltage on the (K126) ETC Negative circuit at 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 on the (K126) ETC Negative 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. (K124) ETC POSITIVE CIRCUIT OPEN Turn the ignition off. Measure the resistance of the (K124) ETC Positive circuit from the Throttle Body 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 (K124) ETC Positive 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. (K126) ETC NEGATIVE CIRCUIT OPEN Measure the resistance of the (K126) ETC Negative circuit from the Throttle Body 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 (K126) ETC Negative 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. (K124) ETC POSITIVE CIRCUIT SHORTED TO GROUND Measure the resistance between a known good ground and the (K124) ETC Positive circuit at the appropriate terminal of PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position). Is the resistance below 100 Ohms? Yes Repair the short to ground in the (K124) ETC Positive 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. (K126) ETC NEGATIVE CIRCUIT SHORTED TO GROUND Measure the resistance between a known good ground and the (K126) ETC Negative circuit at the appropriate terminal of PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position). Is the resistance below 100 Ohms? Yes Repair the short to ground in the (K126) ETC Negative 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. POWERTRAIN CONTROL MODULE (PCM) Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Throttle Body 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 Throttle Body 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) .

P2115-ACCELERATOR PEDAL POSITION SENSOR 1 MINIMUM STOP PERFORMANCE

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

The Electronic Throttle Control (ETC) system uses two Accelerator Pedal Position (APP) sensors to monitor the accelerator pedal position. The APP sensors 1 and 2 are located within the pedal assembly. Each sensor has a 5-volt reference circuit, a low reference circuit, and a signal circuit. Processors are also used to monitor the ETC system data. The processors are located within the Powertrain Control Module (PCM). Each signal circuit provides processors with a signal voltage proportional to pedal movement. The processors share and monitor data to verify that the indicated APP calculation is correct.

Ignition on. During in plant mode the APP Sensors need to be checked to make sure that idle and full pedal travel can be reached on both sensors. The test for P2115 is only enabled once test for P2166 has passed.

APPS No. 1 has failed to achieve the required minimum value during In Plant testing. One trip fault and the code will set within five seconds. Engine will only idle. ETC light is illuminated.

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

1. IN PLANT TEST FAILURE Ignition on, engine not running. NOTE: This DTC is set when the APP Sensors are learned in plant but do not reach the Minimum or Maximum voltage range. With the scan tool, select View DTCs. With the scan tool, erase DTCs. Start the engine. With the scan tool, view DTCs. NOTE: Diagnose any APPS out of Range and 5 Volt Supply DTCs before continuing. 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. APPS RELEARN With the scan tool select the ETC RELEARN function. Next, erase DTCs. Start the engine. Does the DTC return? Yes Replace the APPS Assembly in accordance with the Service Information. Refer to «PEDAL, ACCELERATOR, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . After installation is complete, use a scan tool and select the ETC RELEARN function. 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.

P2116-ACCELERATOR PEDAL POSITION SENSOR 2 MINIMUM STOP PERFORMANCE

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

The Electronic Throttle Control (ETC) system uses two Accelerator Pedal Position (APP) sensors to monitor the accelerator pedal position. The APP sensors 1 and 2 are located within the pedal assembly. Each sensor has a 5-volt reference circuit, a low reference circuit, and a signal circuit. Processors are also used to monitor the ETC system data. The processors are located within the Powertrain Control Module (PCM). Each signal circuit provides processors with a signal voltage proportional to pedal movement. The processors share and monitor data to verify that the indicated APP calculation is correct.

Ignition on. During in plant mode the APP Sensors need to be checked to make sure that idle and full pedal travel can be reached on both sensors. The test for P2116 is only enabled once test for P2167 has passed.

APPS No. 2 has failed to achieve the required minimum value during In Plant testing. One trip fault and the code will be stored within 5 seconds. Engine will only idle. ETC light is illuminated.

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

1. IN PLANT TEST FAILURE Ignition on, engine not running. NOTE: This DTC is set when the APP Sensors are learned in plant but do not reach the Minimum or Maximum voltage range. With a scan tool, select View DTCs and record the related Freeze Frame data. With a scan tool, erase DTCs. Start the engine. With a scan tool, 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. APPS RELEARN With a scan tool select the ETC RELEARN function. Next, erase DTCs. Start the engine. Does the DTC return? Yes Replace the APPS Assembly in accordance with the service information. Refer to «SENSOR, ACCELERATOR PEDAL POSITION, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . After installation is complete, use a scan tool and select the ETC RELEARN function. 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.

P2118-ELECTRONIC THROTTLE CONTROL MOTOR CIRCUIT

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

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.

With the ignition on and the ETC Motor is not in Limp Home mode.

When the Powertrain Control Module (PCM) detects an internal error or a short between the ETC Motor- and ETC Motor + circuits in the ETC Motor Driver. 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: When this DTC is Active, the engine speed, torque and vehicle speed are limited to a Limp in mode. NOTE: If P2072 is also set, this indicates that the cold weather ice blockage routine has run. No repair action is required. Ignition on, engine not running. NOTE: If the P2118 is intermittent, it is possible that the controller is overheating in extreme hot temperatures and this is considered a normal protection operation. No repair is necessary. With the scan tool, read the active DTCs. Look closely at the temperatures at which this DTC set. 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. THROTTLE PLATE INSPECTION Turn the ignition off. Remove the Air Cleaner Assembly from the Throttle Body. Refer to «THROTTLE BODY, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . Check for any signs of a foreign material (ice or dirt) on the Throttle Plate or in the bore causing the Throttle Plate to stick. Were any signs of foreign material or scoring of the throttle plate or bore found? Yes Remove the debris if possible or replace the Throttle Body Assembly. Refer to «THROTTLE BODY, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . Disconnect the Battery when replacing the Throttle Body Assembly. After installation is complete, use a scan tool and select the ETC RELEARN function. 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. (K124) ETC POSITIVE CIRCUIT SHORTED TO VOLTAGE Turn the ignition off. Disconnect the Throttle Body harness connector. Disconnect the C2 PCM harness connector. Ignition on, engine not running. 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 voltage on the (K124) ETC Positive circuit at 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 on the (K124) ETC Positive 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. (K126) ETC NEGATIVE CIRCUIT SHORTED TO VOLTAGE Measure the voltage on the (K126) ETC Negative circuit at 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 (K126) ETC Negative 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. (K124) ETC POSITIVE CIRCUIT SHORTED TO THE (K126) ETC NEGATIVE CIRCUIT Turn the ignition off. Measure the resistance between the (K124) ETC Positive circuit and the (K126) ETC Negative circuit at the appropriate terminals of PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position). Is the resistance below 100 Ohms? Yes Repair the short to between the (K124) ETC Positive circuit and the (K126) ETC Negative 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. (K124) ETC POSITIVE CIRCUIT OPEN Measure the resistance of the (K124) ETC Positive circuit from the Throttle Body 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 open in the (K124) ETC Positive 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. (K124) ETC POSITIVE CIRCUIT SHORTED TO GROUND Measure the resistance between ground and the (K124) ETC Positive circuit between the appropriate terminals of PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position). Is the resistance below 100 Ohms? Yes Repair the short to ground in the (K124) ETC Positive 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. (K126) ETC NEGATIVE CIRCUIT OPEN Measure the resistance of the (K126) ETC Negative circuit from the Throttle Body 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 open in the (K126) ETC Negative 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. (K126) ETC NEGATIVE CIRCUIT SHORTED TO GROUND Measure the resistance between ground and the (K126) ETC Negative circuit between the appropriate terminals of PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position). Is the resistance below 100 Ohms? Yes Repair the short to ground in the (K126) ETC Negative 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 10 .
10. ETC MOTOR NOTE: Take the following measurement using PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position) to avoid possible damage to the Throttle Body harness connector. Connect the Throttle Body harness connector. Measure the resistance of the ETC Motor between the (K124) ETC Positive circuit and the (K126) ETC Negative circuit at the appropriate terminals of PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position). Is the resistance between 2.5 and 25 Ohms at closed throttle? Yes Go To 11 . No Verify that there is good pin to terminal contact in the Throttle Body and Powertrain Control Module connectors. If OK, replace the Throttle Body Assembly. Disconnect the Battery when replacing the Throttle Body Assembly. After installation is complete, use a scan tool and select the ETC RELEARN function. Refer to «THROTTLE BODY, 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) .
11. POWERTRAIN CONTROL MODULE (PCM) Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Throttle Body 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 Throttle Body 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) .

P2122-ACCELERATOR PEDAL POSITION SENSOR 1 CIRCUIT LOW

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

The Electronic Throttle Control (ETC) system uses two Accelerator Pedal Position (APP) sensors to monitor the accelerator pedal position. The APP sensors 1 and 2 are located within the pedal assembly. Each sensor has a 5-volt reference circuit, a low reference circuit, and a signal circuit. Processors are also used to monitor the ETC system data. The processors are located within the Powertrain Control Module (PCM). Each signal circuit provides processors with a signal voltage proportional to pedal movement. The processors share and monitor data to verify that the indicated APP calculation is correct.

With the ignition on and no other APPS No. 1 DTCs present.

When the APP Sensor No. 1 voltage is too low. Engine will additionally idle if the brake pedal is pressed or has failed. Acceleration rate and Engine output are limited. One trip fault and the code will set within five seconds. ETC light is flashing.

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

Scheme 397

Scheme 398

Scheme 399

Scheme 400

Scheme 401

Scheme 402

Scheme 403

Scheme 404

1. ACTIVE DTC NOTE: When this DTC is Active the engine speed, torque and vehicle speed are limited to a Limp in mode. 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 can result in possible serious or fatal injury. NOTE: Diagnose and repair any system voltage or sensor supply voltage DTCs before continuing with this test. NOTE: If you are viewing data recorder information or Freeze Frame data the APP Sensor No. 2 is pulled low by the PCM as part of its system testing. This test happens every 320 milliseconds and may not show up on the scan tool but may show up on a data recorder or lab scope. It is acceptable to see the voltage close to zero with a normal sensor when using a data recorder/lab scope. With the scan tool, select View DTCs. Is the DTC Active at this time? Yes Go To 2 . No Go To 11 .
2. (F855) 5 VOLT SUPPLY CIRCUIT Turn the ignition off. Disconnect the APP Sensor harness connector. Ignition on, engine not running. Measure the voltage on the (F855) 5 Volt Supply circuit in the APP Sensor harness connector. Is the voltage between 4.5 and 5.02 Volts? Yes Go To 3 . No Go To 8 .
3. (K23) APP SENSOR NO. 1 SIGNAL CIRCUIT OPEN Turn the ignition off. 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 (K23) APP Sensor No. 1 Signal circuit from the APP 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 4 . No Repair the open in the (K23) APP Sensor 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) .
4. (K23) APP SENSOR NO. 1 SIGNAL CIRCUIT SHORTED TO GROUND Measure the resistance between ground and the (K23) APP Sensor No. 1 Signal circuit in the APP Sensor harness connector. Is the resistance below 100 Ohms? Yes Repair the short to ground in the (K23) APP Sensor 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 5 .
5. (K23) APP SENSOR NO. 1 SIGNAL CIRCUIT SHORTED TO THE (K167) APP SENSOR NO. 1 RETURN CIRCUIT Measure the resistance between the (K23) APP Sensor No. 1 Signal circuit and the (K167) Sensor No. 1 Return circuit at the APP Sensor harness connector. Is the resistance below 100 Ohms? Yes Repair the short between the (K167) APP Sensor No. 1 Return circuit and the (K23) APP Sensor 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. (K23) APP SENSOR NO. 1 SIGNAL CIRCUIT SHORTED TO THE (K400) APP SENSOR NO. 2 RETURN CIRCUIT Measure the resistance between the (K23) APP Sensor No. 1 Signal circuit and the (K400) APP Sensor No. 2 Return circuit in the APP Sensor harness connector. Is the resistance below 100 Ohms? Yes Repair the short between the (K400) APP Sensor No. 2 Return circuit and the (K23) APP Sensor 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 7 .
7. ACCELERATOR PEDAL POSITION SENSOR Connect the PCM harness connectors. Ignition on, engine not running. With the scan tool, monitor the APP Sensor No. 1 voltage. Connect a jumper wire between the (F855) 5 Volt Supply circuit and the (K23) APP Sensor No. 1 Signal circuit in the Sensor harness connector. NOTE: The sensor voltage should be approximately 5.0 Volts (plus or minus.1 of a Volt) with the jumper wire installed. Does the scan tool display the voltage as described above? Yes Verify that there is good pin to terminal contact in the APP Sensor and Powertrain Control Module connectors. If OK, replace the APP Sensor Assembly in accordance with the Service Information. Refer to «PEDAL, ACCELERATOR, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . After installation is complete, use a scan tool and select the ETC RELEARN function to relearn the APPS values. 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 10 . NOTE: Remove the jumper wire before continuing.
8. (F855) 5 VOLT SUPPLY CIRCUIT OPEN Turn the ignition off. Disconnect the C2 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 (F855) 5 Volt Supply circuit from the 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 open 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) .
9. (F855) 5 VOLT SUPPLY CIRCUIT SHORTED TO GROUND Measure the resistance between ground and the (F855) 5 Volt Supply circuit in the APP 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 10 .
10. POWERTRAIN CONTROL MODULE (PCM) Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Accelerator Pedal Position Sensor and the Powertrain Control Module (PCM). Look for any chafed, pierced, pinched or partially broken wires. Look for broken, bent, pushed out or corroded terminals. Verify that there is good pin to terminal contact in the APP 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) .
11. APP SENSOR SWEEP Ignition on, engine not running. With the scan tool, monitor the APP Sensor 1 voltage. Slowly press the Accelerator pedal down. Does voltage start at approximately 0.45 of a Volt and go above 4.6 Volts with a smooth transition? 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 Replace the APP Sensor Assembly in accordance with the Service Information. Refer to «PEDAL, ACCELERATOR, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . After installation is complete, use a scan tool and select the ETC RELEARN function to relearn the APPS values. 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) .

P2123-ACCELERATOR PEDAL POSITION SENSOR 1 CIRCUIT HIGH

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

With the ignition on and no other APPS No. 1 DTCs present.

When APP Sensor No. 1 voltage is too high. Engine will additionally idle if the brake pedal is pressed or has failed. Acceleration rate and Engine output are limited. One trip fault and the code will set within five seconds. ETC light is flashing.

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

Scheme 405

Scheme 406

Scheme 407

Scheme 408

1. ACTIVE DTC NOTE: When this DTC is Active the engine speed, torque and vehicle speed are limited to a Limp in mode. 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 can result in possible serious or fatal injury. NOTE: Diagnose and repair any system voltage or sensor supply voltage DTCs before continuing with this test. NOTE: If you are viewing data recorder information or Freeze Frame data the APP Sensor No. 2 is pulled low by the PCM as part of its system testing. This test happens every 320 milliseconds and may not show up on the scan tool but may show up on a data recorder or lab scope. It is acceptable to see the voltage close to zero with a normal sensor when using a data recorder/lab scope. With the scan tool, select View DTCs. Is the DTC Active at this time? Yes Go To 2 . No Go To 8 .
2. (K23) APP SENSOR NO. 1 SIGNAL CIRCUIT SHORTED TO VOLTAGE Turn the ignition off. Disconnect the PCM harness connectors. Disconnect the APP Sensor harness connector. Ignition on, engine not running. Measure the voltage on the (K23) APP Sensor No. 1 Signal circuit in the APP Sensor harness connector. Is there any voltage present? Yes Repair the short to voltage in the (K23) APP Sensor 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 3 .
3. (K23) APPS NO. 1 SIGNAL CIRCUIT SHORTED TO THE (K852) 5 VOLT SUPPLY CIRCUIT Turn the ignition off. Measure the resistance between the (K23) APP Sensor No. 1 Signal circuit and the (K852) 5 Volt Supply circuit in the APP Sensor harness connector. Is the resistance below 100 Ohms? Yes Repair the short between the (K23) APP Sensor No. 1 Signal circuit and the (K852) 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 4 .
4. (K23) APPS NO. 1 SIGNAL CIRCUIT SHORTED TO THE (F856) 5 VOLT SUPPLY CIRCUIT Measure the resistance between the (K23) APP Sensor No. 1 Signal circuit and the (F856) 5 Volt Supply circuit in the APP Sensor harness connector. Is the resistance below 100 Ohms? Yes Repair the short between the (K23) APP Sensor No. 1 Signal circuit and the (F856) 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 5 .
5. (K167) APP SENSOR NO. 1 RETURN CIRCUIT OPEN 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 (K167) APP Sensor No. 1 Return circuit from the APP 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 6 . No Repair the open in the (K167) APP Sensor No. 1 Return 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. ACCELERATOR PEDAL POSITION SENSOR Connect the PCM harness connectors. Ignition on, engine not running. With the scan tool, monitor the APP Sensor 2 voltage. Is the voltage above 0 Volts? Yes Go To 7 . No Verify that there is good pin to terminal contact in the APP Sensor and Powertrain Control Module connectors. If OK, replace the APP Sensor Assembly in accordance with the Service Information. Refer to «PEDAL, ACCELERATOR, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . After installation is complete, use a scan tool and select the ETC RELEARN function to relearn the APPS values. 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 Accelerator Pedal Position Sensor and the Powertrain Control Module (PCM). Look for any chafed, pierced, pinched or partially broken wires. Look for broken, bent, pushed out or corroded terminals. Verify that there is good pin to terminal contact in the APP 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) .
8. APP SENSOR NO. 1 SWEEP Ignition on, engine not running. With the scan tool, monitor the Accelerator Pedal Position Sensor voltage. Slowly press the Accelerator Pedal down. Does voltage start at approximately 0.45 of a Volt and go above 4.6 Volts with a smooth transition? 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 Verify that there is good pin to terminal contact in the APP Sensor and Powertrain Control Module connectors. If OK, replace the APP Sensor Assembly in accordance with the Service Information. Refer to «PEDAL, ACCELERATOR, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . After installation is complete, use a scan tool and select the ETC RELEARN function to relearn the APPS values. 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) .

P2127-ACCELERATOR PEDAL POSITION SENSOR 2 CIRCUIT LOW

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

The Electronic Throttle Control (ETC) system uses two Accelerator Pedal Position (APP) sensors to monitor the accelerator pedal position. The APP sensors 1 and 2 are located within the pedal assembly. Each sensor has a 5 Volt reference circuit, a low reference circuit and a signal circuit. Processors are also used to monitor the ETC system data. The processors are located within the Powertrain Control Module (PCM). Each signal circuit provides processors with a signal voltage proportional to pedal movement. The processors share and monitor data to verify that the indicated APP calculation is correct.

With the ignition on and no other APPS No. 2 DTCs present.

When the APP Sensor No. 2 voltage is too low. Engine will only idle if the Brake pedal is Pressed or has failed. Acceleration rate and Engine output are limited. One trip fault and the code will set within five seconds. ETC light is flashing.

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

Scheme 409

Scheme 410

Scheme 411

Scheme 412

Scheme 413

Scheme 414

Scheme 415

Scheme 416

1. ACTIVE DTC NOTE: When this DTC is Active the engine speed, torque and vehicle speed are limited to a Limp in mode. 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 can result in possible serious or fatal injury. NOTE: Diagnose and repair any system voltage or sensor supply voltage DTCs before continuing with this test. NOTE: If you are viewing data recorder information or Freeze Frame data the APP Sensor No. 2 is pulled low by the PCM as part of its system testing. This test happens every 320 milliseconds and may not show up on the scan tool but may show up on a data recorder or lab scope. It is acceptable to see the voltage close to zero with a normal sensor when using a data recorder/lab scope. With the scan tool, select View DTCs. Is the DTC Active at this time? Yes Go To 2 . No Go To 11 .
2. (K856) 5 VOLT SUPPLY CIRCUIT Turn the ignition off. Disconnect the APP Sensor harness connector. Ignition on, engine not running. Measure the voltage on the (K856) 5 Volt Supply circuit in the APP Sensor harness connector. Is the voltage between 4.5 and 5.02 Volts? Yes Go To 3 . No Go To 8 .
3. (K29) APP SENSOR NO. 2 SIGNAL CIRCUIT OPEN Turn the ignition off. Disconnect the PCM harness connectors. 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 (K29) APP Sensor No. 2 Signal circuit from the APP 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 4 . No Repair the open in the (K29) APP Sensor 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) .
4. (K29) APP SENSOR NO. 2 SIGNAL CIRCUIT SHORTED TO GROUND Measure the resistance between ground and the (K29) APP Sensor No. 2 Signal circuit in the APP Sensor harness connector. Is the resistance below 100 Ohms? Yes Repair the short to ground in the (K29) APP Sensor 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. (K29) APP SENSOR NO. 2 SIGNAL CIRCUIT SHORTED TO THE (K400) APP SENSOR NO. 2 RETURN CIRCUIT Measure the resistance between the (K29) APP Sensor No. 2 Signal circuit and the (K400) Sensor No. 2 Return circuit in the APP Sensor harness connector. Is the resistance below 100 Ohms? Yes Repair the short between the (K400) APP Sensor No. 2 Return circuit and the (K29) APP Sensor 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 6 .
6. (K29) APP SENSOR NO. 2 SIGNAL CIRCUIT SHORTED TO THE (K167) APP SENSOR NO. 1 RETURN CIRCUIT Measure the resistance between the (K29) APP Sensor No. 2 Signal circuit and the (K167) Sensor No. 1 Return circuit in the APP Sensor harness connector. Is the resistance below 100 Ohms? Yes Repair the short between the (K167) APP Sensor No. 1 Return circuit and the (K29) APP Sensor 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. ACCELERATOR PEDAL POSITION SENSOR Connect the PCM harness connectors. Ignition on, engine not running. With the scan tool, monitor the APP Sensor No. 2 voltage. Connect a jumper wire between the (K856) 5 Volt Supply circuit and the (K29) APP Sensor No. 2 Signal circuit in the Sensor harness connector. NOTE: The sensor voltage should be approximately 5.0 Volts (plus or minus.1 Volt) with the jumper wire installed. Does the scan tool display the voltage as described above? Yes Verify that there is good pin to terminal contact in the APP Sensor and Powertrain Control Module connectors. If OK, replace the APP Sensor Assembly in accordance with the Service Information. Refer to «PEDAL, ACCELERATOR, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . After installation is complete, use a scan tool and select the ETC RELEARN function to relearn the APPS values. 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 10 . NOTE: Remove the jumper wire before continuing.
8. (K856) 5 VOLT SUPPLY CIRCUIT OPEN 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 (K856) 5 Volt Supply circuit from the 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 open in the (K856) 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) .
9. (K856) 5 VOLT SUPPLY CIRCUIT SHORTED TO GROUND Measure the resistance between ground and the (K856) 5 Volt Supply circuit in the APP Sensor harness connector. Is the resistance below 100 Ohms? Yes Repair the short to ground in the (K856) 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 10 .
10. POWERTRAIN CONTROL MODULE (PCM) Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Accelerator Pedal Position Sensor and the Powertrain Control Module (PCM). Look for any chafed, pierced, pinched or partially broken wires. Look for broken, bent, pushed out or corroded terminals. Verify that there is good pin to terminal contact in the APP 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) .
11. APP SENSOR SWEEP Ignition on, engine not running. With the scan tool, monitor the APP Sensor No. 2 voltage. Slowly press the Accelerator pedal down. Does voltage start at approximately 0.22 of a Volt and go above 2.31 Volts with a smooth transition? 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 If OK, replace the APP Sensor Assembly in accordance with the Service Information. Refer to «PEDAL, ACCELERATOR, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . After installation is complete, use a scan tool and select the ETC RELEARN function to relearn the APPS values. 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) .

P2128-ACCELERATOR PEDAL POSITION SENSOR 2 CIRCUIT HIGH

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

The Electronic Throttle Control (ETC) system uses two Accelerator Pedal Position (APP) sensors to monitor the accelerator pedal position. The APP sensors 1 and 2 are located within the pedal assembly. Each sensor has a 5 Volt reference circuit, a low reference circuit and a signal circuit. Processors are also used to monitor the ETC system data. The processors are located within the Powertrain Control Module (PCM). Each signal circuit provides processors with a signal voltage proportional to pedal movement. The processors share and monitor data to verify that the indicated APP calculation is correct.

With the ignition on and no other APPS No. 2 DTCs present.

When APP Sensor No. 2 voltage is too high. Idle is additionally forced any time the brake is applied or failed. Acceleration rate and Engine output are limited. One trip fault and the code will set within five seconds. ETC light is flashing.

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

Scheme 417

Scheme 418

Scheme 419

Scheme 420

1. ACTIVE DTC NOTE: When this DTC is Active the engine speed, torque and vehicle speed are limited to a Limp in mode. 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 can result in possible serious or fatal injury. NOTE: Diagnose and repair any system voltage or sensor supply voltage DTCs before continuing with this test. NOTE: If you are viewing data recorder information or Freeze Frame data the APP Sensor No. 2 is pulled low by the PCM as part of its system testing. This test happens every 320 milliseconds and may not show up on the scan tool but may show up on a data recorder or lab scope. It is acceptable to see the voltage close to zero with a normal sensor when using a data recorder/lab scope. With the scan tool, select View DTCs. Is the DTC Active at this time? Yes Go To 2 . No Go To 8 .
2. (K29) APP SENSOR NO. 2 SIGNAL CIRCUIT SHORTED TO VOLTAGE Turn the ignition off. Disconnect the PCM harness connectors. Disconnect the APP Sensor harness connector. Ignition on, engine not running. Measure the voltage on the (K29) APP Sensor No. 2 Signal circuit in the APP Sensor harness connector. Is there any voltage present? Yes Repair the short to voltage in the (K29) APP Sensor 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 3 .
3. (K29) APPS NO. 2 SIGNAL CIRCUIT SHORTED TO THE (K856) 5 VOLT SUPPLY CIRCUIT Turn the ignition off. Measure the resistance between the (K29) APP Sensor No. 2 Signal circuit and the (K856) 5 Volt Supply circuit in the APP Sensor harness connector. Is the resistance below 10 Ohms? Yes Repair the short between the (K29) APP Sensor No. 2 Signal circuit and the (K856) 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 4 .
4. (K29) APPS NO. 2 SIGNAL CIRCUIT SHORTED TO THE (F855) 5 VOLT SUPPLY CIRCUIT Measure the resistance between the (K29) APP Sensor No. 2 Signal circuit and the (F855) 5 Volt Supply circuit in the APP Sensor harness connector. Is the resistance below 10 Ohms? Yes Repair the short between the (K29) APP Sensor No. 2 Signal circuit and 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 5 .
5. (K400) APP SENSOR NO. 2 RETURN CIRCUIT OPEN 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 (K400) APP Sensor No. 2 Return circuit from the APP 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 6 . No Repair the open in the (K400) APP Sensor No. 2 Return 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. ACCELERATOR PEDAL POSITION SENSOR Connect the PCM harness connector. Ignition on, engine not running. With the scan tool, monitor the APP Sensor 2 voltage. Is the voltage above 0 Volts? Yes Go To 7 . No Verify that there is good pin to terminal contact in the APP Sensor and Powertrain Control Module connectors. If OK, replace the APP Sensor Assembly in accordance with the Service Information. Refer to «PEDAL, ACCELERATOR, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . After installation is complete, use a scan tool and select the ETC RELEARN function to relearn the APPS values. 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 Accelerator Pedal Position Sensor and the Powertrain Control Module (PCM). Look for any chafed, pierced, pinched or partially broken wires. Look for broken, bent, pushed out or corroded terminals. Verify that there is good pin to terminal contact in the APP 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) .
8. APP SENSOR NO. 2 SWEEP Ignition on, engine not running. With the scan tool, monitor the APP Sensor 2 voltage. Slowly press the Accelerator Pedal down. Does voltage start at approximately 0.22 of a Volt and go above 2.31 Volts with a smooth transition? 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 Verify that there is good pin to terminal contact in the APP Sensor and Powertrain Control Module connectors. If OK, replace the APP Sensor Assembly in accordance with the Service Information. Refer to «PEDAL, ACCELERATOR, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . After installation is complete, use a scan tool and select the ETC RELEARN function to relearn the APPS values. 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) .

P2135-THROTTLE POSITION SENSOR 1/2 CORRELATION

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

The Electronic Throttle Control (ETC) system uses two Throttle Position Sensors (TPS) to monitor the accelerator pedal position. The TPS sensors 1 and 2 are located within the throttle body assembly. Each sensor has a 5-volt reference circuit, a low reference circuit, and a signal circuit. Processors are also used to monitor the ETC system data. The processors are located within the Powertrain Control Module (PCM). Each signal circuit provides processors with a signal voltage proportional to throttle blade movement. The processors share and monitor data to verify that the indicated TPS calculation is correct.

With the ignition on and no other DTCs present for TP Sensor No. 1 or No. 2.

The Powertrain Control Module (PCM) recognizes TP Sensors No. 1 and No. 2 are not coherent. One trip fault and the code will set within five seconds. ETC light is illuminated.

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

1. ACTIVE DIAGNOSTIC TROUBLE CODE (DTC) NOTE: The throttle plate and linkage should be free from binding and carbon build up. NOTE: Make sure the throttle plate is at the idle position. Ignition on, engine not running. NOTE: Inspect the engine for vacuum leaks. With a scan tool, read the active DTCs. Is the DTC Active at this time? Yes Go To 2 . No Go To 7 .
2. EXCESSIVE RESISTANCE IN THE (K22) TP SENSOR NO. 1 SIGNAL CIRCUIT Turn the ignition off. Disconnect the C2 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 Adapter (special tool #8815-1, PCM Pinout Box Adapter) to perform the diagnosis. Using a Voltmeter perform a voltage drop test. Backprobe the (K22) TP Sensor No. 1 Signal circuit at the Throttle Body harness connector and probe the appropriate terminal of the PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position). Make sure the Voltmeter leads are connected so a 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 may result in possible serious or fatal injury. Start the engine and allow it to reach normal operating temperature. Monitor the Voltmeter. Is the voltage below 0.5 of a Volt? Yes Go To 3 . No Repair the excessive resistance in the (K22) TP Sensor 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) .
3. EXCESSIVE RESISTANCE IN THE (K922) TP SENSOR RETURN CIRCUIT Turn the ignition off. Move the Voltmeter leads to backprobe the (K922) TP Sensor Return circuit at the Throttle Body harness connector and probe the appropriate terminal of the PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position). Make sure the Voltmeter leads are connected so a 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 may result in possible serious or fatal injury. Start the engine and allow it to reach normal operating temperature. Monitor the Voltmeter. Is the voltage below 0.5 of a Volt? Yes Go To 4 . No Repair the excessive resistance in the (K922) TP Sensor Return 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. EXCESSIVE RESISTANCE IN THE (K122) TP SENSOR NO. 2 SIGNAL CIRCUIT Turn the ignition off. Move the Voltmeter leads to backprobe the (K122) TP Sensor No. 2 Signal circuit at the Throttle Body harness connector and probe the appropriate terminal of the PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position). Make sure the Voltmeter leads are connected so a 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 may result in possible serious or fatal injury. Start the engine and allow it to reach normal operating temperature. Monitor the Voltmeter. Is the voltage below 0.5 of a Volt? Yes Go To 5 . No Repair the excessive resistance in the (K122) TP Sensor 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) .
5. EXCESSIVE RESISTANCE IN THE (F855) 5-VOLT SUPPLY CIRCUIT Turn the ignition off. Using a Voltmeter perform a voltage drop test. Backprobe the (F855) 5-Volt Supply circuit at the Throttle Body harness connector and probe the appropriate terminal of the PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position). Make sure the Voltmeter leads are connected so a 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 may result in possible serious or fatal injury. Start the engine and allow it to reach normal operating temperature. Monitor the Voltmeter. Is the voltage below 0.5 of a Volt? Yes Go To 6 . 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) .
6. POWERTRAIN CONTROL MODULE (PCM) Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Throttle Body 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 Throttle Body 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) .
7. THROTTLE FOLLOWER TEST Ignition on, engine not running. With a scan tool, perform the ETC Throttle Follower Test and monitor the TP Sensor No. 1 or No. 2 voltage. Slowly press the throttle pedal down. The voltage for TP Sensor No. 1 should start at approximately 0.7 of a Volt and increase to approximately 4.3 Volts. The voltage for TP Sensor No. 2 should start at approximately 4.3 Volts and decrease to approximately 0.7 of a Volt. Is the voltage within the range of the listed specification for the appropriate Sensor? 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 Verify that there is good pin to terminal contact in the Throttle Body and Powertrain Control Module connectors. If OK, disconnect the Battery when replacing the Throttle Body Assembly. Replace the Throttle Body Assembly. Refer to «THROTTLE BODY, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . After installation is complete, use a scan tool and select the ETC RELEARN function. 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) .

P2138-ACCELERATOR PEDAL POSITION SENSOR 1/2 CORRELATION

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

The Electronic Throttle Control (ETC) system uses two accelerator pedal position (APP) sensors to monitor the accelerator pedal position. The APP sensors 1 and 2 are located within the pedal assembly. Each sensor has a 5 Volt reference circuit, a low reference circuit and a signal circuit. Processors are also used to monitor the ETC system data. The processors are located within the Powertrain Control Module (PCM). Each signal circuit provides processors with a signal voltage proportional to pedal movement. The processors share and monitor data to verify that the indicated APP calculation is correct.

With the ignition on and no APPS No. 1 and APPS No. 2 DTC present.

APPS values No. 1 and No. 2 are not coherent. Idle is additionally forced when the brake pedal is pressed or failed. Acceleration rate and Engine output are limited. One trip fault and the code will set within five seconds. 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) 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 can result in possible serious or fatal injury. NOTE: Diagnose and repair any system voltage or sensor supply voltage DTCs before continuing with this test. NOTE: If you are viewing data recorder information or Freeze Frame data the APP Sensor No. 2 is pulled low by the PCM as part of its system testing. This test happens every 320 milliseconds and may not show up on the scan tool but may show up on a data recorder or lab scope. It is acceptable to see the voltage close to zero with a normal sensor when using a data recorder/lab scope. 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 (K23) APPS NO. 1 SIGNAL CIRCUIT Turn the ignition off. Disconnect the C3 harness connector. CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install the PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position) along with the Adapter (special tool #8815-1, PCM Pinout Box Adapter) to perform the diagnosis. Using a Voltmeter perform a voltage drop test. Backprobe the (K23) APPS No. 1 Signal circuit at the APPS harness connector and probe the appropriate terminal of the PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position). Make sure the Voltmeter leads are connected so a 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 may result in possible serious or fatal injury. Start the engine and allow it to reach normal operating temperature. Monitor the Voltmeter. Is the voltage below 0.5 of a Volt? Yes Go To 3 . No Repair the excessive resistance in the (K23) APP Sensor 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) .
3. EXCESSIVE RESISTANCE IN THE (K167) APP SENSOR NO. 1 GROUND CIRCUIT Turn the ignition off. Move the Voltmeter leads to backprobe the (K167) APP Sensor No. 1 Ground circuit at the APPS harness connector and probe the appropriate terminal of the PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position). Make sure the Voltmeter leads are connected so a 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 may result in possible serious or fatal injury. Start the engine and allow it to reach normal operating temperature. Monitor the Voltmeter. Is the voltage below 0.5 of a Volt? Yes Go To 4 . No Repair the excessive resistance in the (K167) APP Sensor No. 1 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) .
4. EXCESSIVE RESISTANCE IN THE (K29) APP SENSOR NO. 2 SIGNAL CIRCUIT Turn the ignition off. Move the Voltmeter leads to backprobe the (K29) APP Sensor No. 2 Signal circuit at the APPS harness connector and probe the appropriate terminal of the PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position). Make sure the Voltmeter leads are connected so a 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 may result in possible serious or fatal injury. Start the engine and allow it to reach normal operating temperature. Monitor the Voltmeter. Is the voltage below 0.5 of a Volt? Yes Go To 5 . No Repair the excessive resistance in the (K29) APP Sensor 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) .
5. EXCESSIVE RESISTANCE IN THE (K400) APP SENSOR NO. 2 GROUND CIRCUIT Turn the ignition off. Move the Voltmeter leads to backprobe the (K400) APP Sensor No. 2 Ground circuit at the APPS harness connector and probe the appropriate terminal of the PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position). Make sure the Voltmeter leads are connected so a 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 may result in possible serious or fatal injury. Start the engine and allow it to reach normal operating temperature. Monitor the Voltmeter. Is the voltage below 0.5 of a Volt? Yes Go To 6 . No Repair the excessive resistance in the (K400) APP Sensor No. 2 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) .
6. EXCESSIVE RESISTANCE IN THE (F855) 5 VOLT SUPPLY CIRCUIT Turn the Ignition off. Remove PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position) from the C3 PCM harness connector and Re-Connect the C3 PCM harness connector to the PCM. Disconnect the C2 PCM harness connector to install PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position) and Adapter (special tool #8815-1, PCM Pinout Box Adapter). Using a Voltmeter perform a voltage drop test. Backprobe the (F855) 5 Volt Supply circuit at the APPS harness connector and probe the appropriate terminal of the PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position). Make sure the Voltmeter leads are connected so a 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 may result in possible serious or fatal injury. Start the engine and allow it to reach normal operating temperature. Monitor the Voltmeter. Is the voltage below 0.5 of a Volt? 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. EXCESSIVE RESISTANCE IN THE (F856) 5 VOLT SUPPLY CIRCUIT Turn the Ignition off. Remove PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position) from the C2 PCM harness connector and Re-Connect the C2 PCM harness connector to the PCM. Disconnect the C1 PCM harness connector to install PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position) and Adapter (special tool #8815-1, PCM Pinout Box Adapter). Using a Voltmeter perform a voltage drop test. Backprobe the (F856) 5 Volt Supply circuit at the APPS harness connector and probe the appropriate terminal of the PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position). Make sure the Voltmeter leads are connected so a 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 may result in possible serious or fatal injury. Start the engine and allow it to reach normal operating temperature. Monitor the Voltmeter. Is the voltage below 0.5 of a Volt? Yes Go To 8 . No Repair the excessive resistance in the (F856) 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) .
8. CHECKING APPS NO. 1 AND NO. 2 WITH A LAB SCOPE Ignition on, engine not running. Set up a lab scope in a way that you can view two graphs simultaneously. Backprobe (K23) APP Sensor No. 1 Signal circuit using Channel 1 at the APP Sensor harness connector. Backprobe (K29) APP Sensor No. 2 Signal circuit using Channel 2 at the APP Sensor harness connector. NOTE: The APP Sensor No. 2 is pulled low by the PCM as part of its system testing. This test happens every 320 milliseconds and may not show up on the scan tool but may show up on a data recorder or lab scope. It is acceptable to see the voltage close to zero with a normal sensor when using a data recorder/lab scope. Slowly press and release the Accelerator Pedal while monitoring the lab scope screen. Does the scope pattern show any missing or erratic signals? Yes Replace the APP Sensor Assembly in accordance with the Service Information. Refer to «PEDAL, ACCELERATOR, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . After installation is complete, use a scan tool and select the ETC RELEARN function to relearn the APPS values. 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) Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Accelerator Pedal Position Sensor and the Powertrain Control Module (PCM). Look for any chafed, pierced, pinched or partially broken wires. Look for broken, bent, pushed out or corroded terminals. Verify that there is good pin to terminal contact in the APP 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) .

P2161-VEHICLE SPEED SENSOR 2 ERRATIC

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

Ignition on.

The Powertrain Control Module (PCM) recognizes Vehicle speed input No. 2 erratic or high. VSS No. 2 is based on the average of the Front Wheel Speeds. One trip fault and the code will set within five seconds. No MIL and No ETC light. Cruise is disabled.

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

1. ACTIVE DTC Ignition on, engine not running. NOTE: Check for any Bus Communication DTCs. If no Bus or Communication DTCs are set, check for active DTCs stored in the Anti-Lock Brake Module. Any bus or communication DTCs or VSS DTCs in the Anti-Lock Brake Module must be properly diagnosed before continuing. 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. VISUAL INSPECTION NOTE: This code can set due to tire circumference differences and from the front or rear wheels being on a slippery surface while the opposite tires are not. This code may also set on a hard acceleration on loose gravel or during other off road driving conditions. Check tire pressure of all the tires. Check tire wear on all the tires. Ask the customer what the road and driving conditions were like when the fault set. Were any problems found? Yes Repair as necessary. If the code sets during a front OR rear wheel spin condition, no repair is 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. POWERTRAIN CONTROL MODULE (PCM) Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Wheel Speed Sensor, ABS Module 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 Wheel Speed Sensor, ABS Module 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) .

P2166-ACCELERATOR PEDAL POSITION SENSOR 1 MAXIMUM STOP PERFORMANCE

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

The Electronic Throttle Control (ETC) system uses two accelerator pedal position (APP) sensors to monitor the accelerator pedal position. The APP sensors 1 and 2 are located within the pedal assembly. Each sensor has a 5 Volt reference circuit, a low reference circuit and a signal circuit. Processors are also used to monitor the ETC system data. The processors are located within the Powertrain Control Module (PCM). Each signal circuit provides processors with a signal voltage proportional to pedal movement. The processors share and monitor data to verify that the indicated APP calculation is correct.

Ignition on. During in plant mode the APP Sensors need to be checked to make sure that idle and full pedal travel can be reached on both sensors.

APPS No. 1 has failed to achieve the required maximum value during In Plant testing. One trip fault and the code will set within five seconds. Engine will only idle. ETC light will illuminate.

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

1. IN PLANT TEST FAILURE Ignition on, engine not running. NOTE: This DTC is set when the APP Sensors are learned in plant but do not reach the Minimum or Maximum voltage range. With the scan tool, select View DTCs. With the scan tool, erase DTCs. Start the engine. With the scan tool, 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. APPS RELEARN With the scan tool select the ETC RELEARN function. Next, erase DTCs. Start the engine. Does the DTC return? Yes Replace the APPS Assembly in accordance with the Service Information. After installation is complete, use a scan tool and select the ETC RELEARN function. Refer to «SENSOR, ACCELERATOR PEDAL POSITION, 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 Test Complete.

P2167-ACCELERATOR PEDAL POSITION SENSOR 2 MAXIMUM STOP PERFORMANCE

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

The Electronic Throttle Control (ETC) system uses two accelerator pedal position (APP) sensors to monitor the accelerator pedal position. The APP sensors 1 and 2 are located within the pedal assembly. Each sensor has a 5-volt reference circuit, a low reference circuit, and a signal circuit. Processors are also used to monitor the ETC system data. The processors are located within the Powertrain Control Module (PCM). Each signal circuit provides processors with a signal voltage proportional to pedal movement. The processors share and monitor data to verify that the indicated APP calculation is correct.

Ignition on. During in plant mode the APP Sensors need to be checked to make sure that idle and full pedal travel can be reached on both sensors.

APPS No. 2 has failed to achieve the required maximum value during In Plant testing. One trip fault and the code will set within five seconds. Engine will only idle. ETC light will illuminate.

1. IN PLANT TEST FAILURE Ignition on, engine not running. NOTE: This DTC is set when the APP Sensors are learned in plant but do not reach the Minimum or Maximum voltage range. With a scan tool, select View DTCs. With the scan tool, erase DTCs. Start the engine. With the scan tool, 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. APPS RELEARN With a scan tool select the ETC RELEARN function. Next, erase DTCs. Start the engine. Does the DTC return? Yes Replace the APPS Assembly in accordance with the Service Information. Refer to «PEDAL, ACCELERATOR, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . After installation is complete, use a scan tool and select the ETC RELEARN function. 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.

P2172-HIGH AIRFLOW/VACUUM LEAK DETECTED (INSTANTANEOUS ACCUMULATION)

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

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.

Ignition on and engine running with no MAP Sensor DTCs.

A large vacuum leak has been detected or both of the TP Sensors have failed based on their position being 2.5 Volts and the calculated MAP value is less than the actual MAP minus an Offset value. One trip fault and the code will set within five seconds. ETC light will flash.

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

Scheme 421

Scheme 422

Scheme 423

Scheme 424

Scheme 425

Scheme 426

1. ACTIVE DIAGNOSTIC TROUBLE CODE (DTC) NOTE: The most likely cause of this DTC is a vacuum leak. NOTE: This fault code could be present if any Camshaft or Crankshaft Position Sensor DTCs are set. No repair is necessary for P2172 if any Camshaft or Crankshaft Position Sensor DTCs are set. NOTE: Diagnose any 5 Volt Supply, TP Sensor, Fuel System Lean or Rich or MAP Sensor DTCs before continuing. NOTE: The throttle plate should be free from binding and carbon build up. Ignition on, engine not running. With 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. VACUUM LEAK NOTE: This code is enabled on engines with a plastic intake manifold and is intended to limit the maximum engine speed if a large crack occurs. NOTE: A large vacuum leak is most likely the cause of this DTC. Inspect the Intake Manifold and Throttle Body for leaks and cracks. Inspect the Power Brake Booster for any vacuum leaks. Inspect the PCV system for proper operation and any vacuum leaks. Inspect the MAP Sensor for proper installation. Were any vacuum leaks found? Yes Repair the vacuum leak 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. MAP SENSOR OPERATION Start the engine. With the scan tool, monitor the MAP Sensor voltage. Snap the Accelerator pedal. Does the MAP Sensor voltage vary from below 2.0 Volts at idle to above 3.5 Volts at Wide Open Throttle? Yes Go To 4 . No Go To 13 .
4. TP SENSOR OPERATION Ignition on, engine not running. With the scan tool, perform the ETC Throttle Follower Test. TP Sensor No. 1 should start at approximately 0.7 of a Volt and increase to 4.3 Volts. TP Sensor No. 2 should start at approximately 4.3 Volts and decrease to 0.7 of a Volt. Is the voltage transition smooth between the appropriate values? 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 5 .
5. RESISTANCE IN THE (F855) 5 VOLT SUPPLY CIRCUIT Turn the ignition off. Disconnect the Throttle Body harness connector. Disconnect the C2 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 (F855) 5 Volt Supply circuit from the Throttle Body harness connector to the appropriate terminal of PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position). Is the resistance above 100 Ohms? Yes Go To 6 . 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) .
6. (F855) 5 VOLT SUPPLY CIRCUIT SHORTED TO GROUND Measure the resistance between ground and (F855) 5 Volt Supply circuit at the Throttle Body harness connector. Is the resistance above 100 Ohms? Yes Go To 7 . No 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) .
7. TP SENSOR Connect the C2 PCM harness connector. Ignition on, engine not running. With the scan tool, monitor the TP Sensor voltage. Connect a jumper wire between the (K22) TP Sensor No. 1 Signal circuit and the (K922) TP Sensor Return circuit in the Throttle Body harness connector. TP Sensor No. 1 voltage should start at approximately 4.8 Volts and decrease to 0.2 of a Volt. Connect a jumper wire between the (K122) TP Sensor No. 2 Signal circuit and the (F855) 5 Volt Supply circuit in the Throttle Body harness connector. TP Sensor No. 2 voltage should start at approximately 0 Volts and increase to 4.8 to 5.2 Volts. Does the TP Sensor voltage change to the appropriate voltage with the jumper wire installed? Yes Verify that there is good pin to terminal contact in the Throttle Body and Powertrain Control Module connectors. Disconnect the Battery before replacing the Throttle Body Assembly. If OK, replace the Throttle Body Assembly. After installation is complete, use a scan tool and select the ETC RELEARN function 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. RESISTANCE IN THE (K22) TP SENSOR NO. 1 SIGNAL CIRCUIT Turn the ignition off. Disconnect the C2 PCM harness connector. Measure the resistance of the (K22) TP Sensor No. 1 Signal circuit from the Throttle Body harness connector 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 9 . No Repair the excessive resistance in the (K22) TP Sensor 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) .
9. RESISTANCE IN THE (K122) TP SENSOR NO. 2 SIGNAL CIRCUIT Measure the resistance of the (K122) TP Sensor No. 2 Signal circuit from the Throttle Body harness connector 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 10 . No Repair the excessive resistance in the (K122) TP Sensor 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) .
10. (K22) TP SENSOR NO. 1 SIGNAL CIRCUIT SHORTED TO GROUND Measure the resistance between ground and the (K22) TP Sensor No. 1 Signal circuit at the Throttle Body harness connector. Is the resistance above 100 Ohms? Yes Go To 11 . No Repair the short to ground in the (K22) TP Sensor 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) .
11. (K122) TP SENSOR NO. 2 SIGNAL CIRCUIT SHORTED TO GROUND Measure the resistance between ground and the (K122) TP Sensor No. 2 Signal circuit at the Throttle Body harness connector. Is the resistance above 100 Ohms? Yes Go To 12 . No Repair the short to ground in the (K122) TP Sensor 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) .
12. RESISTANCE IN THE (K922) TP SENSOR RETURN CIRCUIT Measure the resistance of the (K922) TP Sensor Return circuit from the Throttle Body 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 19 . No Repair the excessive resistance in the (K922) TP Sensor Return 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) .
13. RESISTANCE IN THE (F856) 5 VOLT SUPPLY CIRCUIT Turn the ignition off. Disconnect the MAP Sensor 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 (F856) 5 Volt Supply circuit from the MAP 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 14 . No Repair the excessive resistance in the (F856) 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) .
14. (F856) 5 VOLT SUPPLY CIRCUIT SHORTED TO GROUND Measure the resistance between ground and the (F856) 5 Volt Supply circuit in the MAP Sensor harness connector. Is the resistance above 100k Ohms? Yes Go To 15 . No Repair the short to ground in the (F856) 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) .
15. MAP SENSOR Connect the C1 PCM harness connector. Ignition on, engine not running. With the scan tool, monitor the MAP Sensor voltage. Connect a jumper wire between the (K1) MAP Signal circuit and the (K900) Sensor ground circuit in the MAP Sensor harness connector. Cycle the ignition switch from off to on. With the scan tool, monitor the MAP Sensor voltage. Does the scan tool display MAP voltage from approximately 4.9 Volts to below 0.5 Volt with the jumper wire installed? Yes 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) . No Go To 16 . NOTE: Remove the jumper wire before continuing.
16. RESISTANCE IN THE (K1) MAP SIGNAL CIRCUIT Turn the ignition off. Disconnect the C2 PCM harness connector. Measure the resistance of the (K1) MAP Signal circuit from the MAP 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 17 . No Repair the excessive resistance in the (K1) MAP 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) .
17. (K1) MAP SIGNAL CIRCUIT SHORTED TO GROUND Measure the resistance between ground and the (K1) MAP Signal circuit in the MAP Sensor harness connector. Is the resistance above 100k Ohms? Yes Go To 18 . No Repair the short to ground in the (K1) MAP 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) .
18. RESISTANCE IN THE (K900) SENSOR GROUND CIRCUIT Measure the resistance of the (K900) Sensor ground circuit from the MAP 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 19 . 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) .
19. POWERTRAIN CONTROL MODULE (PCM) Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the MAP Sensor, Throttle Body 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 MAP Sensor, Throttle Body 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) .

P2173-HIGH AIRFLOW/VACUUM LEAK DETECTED (SLOW ACCUMULATION)

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

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.

Ignition on and engine running with no MAP Sensor DTCs.

A large vacuum leak has been detected or both of the TP Sensors have failed based on their position being 2.5 Volts and the calculated MAP value is less than the Gas Flow Adaptation value is too high. One trip fault the code will set within five seconds. ETC light will flash.

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

1. ACTIVE DIAGNOSTIC TROUBLE CODE (DTC) NOTE: The most likely cause of this DTC is a vacuum leak. NOTE: Diagnose any 5 Volt Supply, TP Sensor, Oxygen Sensor, Fuel related or MAP Sensor DTCs before continuing. NOTE: The throttle plate should be free from binding and carbon build up. Ignition on, engine not running. With 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. VACUUM LEAK NOTE: This code is enabled on engines with a plastic intake manifold and is intended to limit the maximum engine speed if a large crack occurs. NOTE: A large vacuum leak is most likely the cause of this DTC. Inspect the Intake Manifold and Throttle Body for leaks and cracks. Inspect the Power Brake Booster for any vacuum leaks. Inspect the PCV system for proper operation or any vacuum leaks. Inspect the MAP Sensor for proper installation. Were any vacuum leaks found? Yes Repair the vacuum leak 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. MAP SENSOR OPERATION Start the engine. With the scan tool, monitor the MAP Sensor voltage. Snap the Accelerator pedal. Does the MAP Sensor voltage vary from below 2.0 Volts at idle to above 3.5 Volts at Wide Open Throttle? Yes Go To 4 . No Go To 13 .
4. TP SENSOR OPERATION Ignition on, engine not running. With the scan tool, perform the ETC Throttle Follower Test. TP Sensor No. 1 should start at approximately 0.7 of a Volt and increase to 4.3 Volts. TP Sensor No. 2 should start at approximately 4.3 Volts and decrease to 0.7 of a Volt. Is the voltage transition smooth between the appropriate values? 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 5 .
5. RESISTANCE IN THE (F855) 5 VOLT SUPPLY CIRCUIT Turn the ignition off. Disconnect the Throttle Body harness connector. Disconnect the C2 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 (F855) 5 Volt Supply circuit from the Throttle Body harness connector to the appropriate terminal of PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position). Is the resistance below 100 Ohms? Yes Go To 6 . 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) .
6. (F855) 5 VOLT SUPPLY CIRCUIT SHORTED TO GROUND Measure the resistance between ground and (F855) 5 Volt Supply circuit at the Throttle Body harness connector. Is the resistance above 100 Ohms? Yes Go To 7 . No 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) .
7. TP SENSOR Connect the C2 PCM harness connector. Ignition on, engine not running. With the scan tool, monitor the TP Sensor voltage. Connect a jumper wire between the (K22) TP Sensor No. 1 Signal circuit and the (K922) TP Sensor Return circuit in the Throttle Body harness connector. TP Sensor No. 1 voltage should start at approximately 4.7 Volts and decrease to 0.3 of a Volt. Connect a jumper wire between the (K122) TP Sensor No. 2 Signal circuit and the (F855) 5 Volt Supply circuit in the Throttle Body harness connector. TP Sensor No. 2 voltage should start at approximately 0.3 of a Volt and increase to 4.7 Volts. Does the TP Sensor voltage change to the appropriate voltage with the jumper wire installed? Yes Verify that there is good pin to terminal contact in the Throttle Body and Powertrain Control Module connectors. Disconnect the Battery before replacing the Throttle Body Assembly. If OK, replace the Throttle Body Assembly. After installation is complete, use a scan tool and select the ETC RELEARN function. Refer to «THROTTLE BODY, 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 8 .
8. RESISTANCE IN THE (K22) TP SENSOR NO. 1 SIGNAL CIRCUIT Turn the ignition off. Disconnect the C2 PCM harness connector. Measure the resistance of the (K22) TP Sensor No. 1 Signal circuit from the Throttle Body harness connector 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 9 . No Repair the excessive resistance in the (K22) TP Sensor 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) .
9. RESISTANCE IN THE (K122) TP SENSOR NO. 2 SIGNAL CIRCUIT Measure the resistance of the (K122) TP Sensor No. 2 Signal circuit from the Throttle Body harness connector 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 10 . No Repair the excessive resistance in the (K122) TP Sensor 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) .
10. (K22) TP SENSOR NO. 1 SIGNAL CIRCUIT SHORTED TO GROUND Measure the resistance between ground and the (K22) TP Sensor No. 1 Signal circuit at the Throttle Body harness connector. Is the resistance above 100k Ohms? Yes Go To 11 . No Repair the short to ground in the (K22) TP Sensor 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) .
11. (K122) TP SENSOR NO. 2 SIGNAL CIRCUIT SHORTED TO GROUND Measure the resistance between ground and the (K122) TP Sensor No. 2 Signal circuit at the Throttle Body harness connector. Is the resistance above 100k Ohms? Yes Go To 12 . No Repair the short to ground in the (K122) TP Sensor 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) .
12. RESISTANCE IN THE (K922) TP SENSOR RETURN CIRCUIT Measure the resistance of the (K922) TP Sensor Return circuit from the Throttle Body 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 19 . No Repair the excessive resistance in the (K922) TP Sensor Return 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) .
13. RESISTANCE IN THE (F856) 5 VOLT SUPPLY CIRCUIT Turn the ignition off. Disconnect the MAP Sensor 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 (F856) 5 Volt Supply circuit from the MAP 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 14 . No Repair the excessive resistance in the (F856) 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) .
14. (F856) 5 VOLT SUPPLY CIRCUIT SHORTED TO GROUND Measure the resistance between ground and the (F856) 5 Volt Supply circuit in the MAP Sensor harness connector. Is the resistance above 100k Ohms? Yes Go To 15 . No Repair the short to ground in the (F856) 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) .
15. MAP SENSOR Connect the C1 PCM harness connector. Ignition on, engine not running. With the scan tool, monitor the MAP Sensor voltage. Connect a jumper wire between the (K1) MAP Signal circuit and the (K900) Sensor ground circuit in the MAP Sensor harness connector. Cycle the ignition switch from off to on. With the scan tool, monitor the MAP Sensor voltage. Does the scan tool display MAP voltage from approximately 4.9 Volts to below 0.5 of a Volt with the jumper wire installed? Yes 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) . No Go To 16 . NOTE: Remove the jumper wire before continuing.
16. RESISTANCE IN THE (K1) MAP SIGNAL CIRCUIT Turn the ignition off. Disconnect the C2 PCM harness connector. Measure the resistance of the (K1) MAP Signal circuit from the MAP 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 17 . No Repair the excessive resistance in the (K1) MAP 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) .
17. (K1) MAP SIGNAL CIRCUIT SHORTED TO GROUND Measure the resistance between ground and the (K1) MAP Signal circuit at the MAP Sensor harness connector. Is the resistance above 100k Ohms? Yes Go To 18 . No Repair the short to ground in the (K1) MAP 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) .
18. RESISTANCE IN THE (K900) SENSOR GROUND CIRCUIT Measure the resistance of the (K900) Sensor ground circuit from the MAP 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 19 . 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) .
19. POWERTRAIN CONTROL MODULE (PCM) Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the MAP Sensor, Throttle Body 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 MAP Sensor, Throttle Body 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) .

P2174-LOW AIRFLOW/RESTRICTION DETECTED (INSTANTANEOUS ACCUMULATION)

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

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.

Ignition on and engine running with no MAP Sensor DTCs.

The Powertrain Control Module (PCM) calculated MAP value is greater than actual MAP value plus an offset value. One trip fault. Three good trips to turn of the mil. ETC light will flash.

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

1. ACTIVE DIAGNOSTIC TROUBLE CODE (DTC) NOTE: The most likely cause of this DTC is a plugged intake air system or dirty Throttle Body. Check for TSBs before continuing. NOTE: Diagnose any 5-Volt Supply, TP Sensor, Fuel System Lean or Rich, or MAP Sensor DTCs before continuing. NOTE: The throttle plate should be free from binding and carbon build up. NOTE: Question the customer about weather conditions, as ice build up on the throttle blade can cause this fault when the ambient air temperature is in the -10° C (14° F) to 4° C (39° F) range. Ignition on, engine not running. 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. RESTRICTED AIR INLET SYSTEM Turn the ignition off. Remove the Air Cleaner Assembly. Remove the Air Filter. Inspect the Throttle Body opening for signs of any foreign materials. Check the intake tube and air cleaner for obstructions; include snow packing questions to customer. Were any restrictions found? Yes Repair the restriction 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. MAP SENSOR OPERATION Start the engine. With a scan tool, monitor the MAP Sensor voltage. Snap the Accelerator pedal. Does the MAP Sensor voltage vary from below 2.0 Volts at idle to above 3.5 Volts at Wide Open Throttle? Yes Go To 4 . No Go To 13 .
4. TP SENSOR OPERATION Ignition on, engine not running. With a scan tool, perform the Throttle Follower Test. TP Sensor No. 1 should start at approximately 0.7 of a Volt and increase to 4.3 Volts. TP Sensor No. 2 should start at approximately 4.3 Volts and decrease to 0.7 of a Volt. Is the voltage transition smooth between the appropriate values? 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 5 .
5. RESISTANCE IN THE (F855) 5-VOLT SUPPLY CIRCUIT Turn the ignition off. Disconnect the Throttle Body harness connector. Disconnect the C2 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 (F855) 5-Volt Supply circuit from the Throttle Body harness connector to the appropriate terminal of PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position). Is the resistance below 100 Ohms? Yes Go To 6 . 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) .
6. (F855) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND Measure the resistance between ground and (F855) 5-Volt Supply circuit at the Throttle Body harness connector. Is the resistance above 100k Ohms? Yes Go To 7 . No 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) .
7. TP SENSOR Connect the PCM harness connectors. Ignition on, engine not running. With a scan tool, monitor the TP Sensor voltage. Connect a jumper wire between the (K22) TP Sensor No. 1 Signal circuit and the (K922) TP Sensor Return circuit in the Throttle Body harness connector. TP Sensor No. 1 voltage should start at approximately 4.7 Volts and decrease to 0.3 of a Volt. Connect a jumper wire between the (K122) TP Sensor No. 2 Signal circuit and the (F855) 5-Volt Supply circuit in the Throttle Body harness connector. TP Sensor No. 2 voltage should start at approximately 0.3 Volts and increase to 4.7 Volts. Does the TP Sensor voltage change to the appropriate voltage with the jumper wire installed? Yes Verify that there is good pin to terminal contact in the Throttle Body and Powertrain Control Module connectors. Disconnect the Battery before replacing the Throttle Body Assembly. If OK, replace the Throttle Body Assembly. After installation is complete, use a scan tool and select the ETC RELEARN function. Refer to «THROTTLE BODY, 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 8 .
8. RESISTANCE IN THE (K22) TP SENSOR NO. 1 SIGNAL CIRCUIT Turn the ignition off. Disconnect the C2 PCM harness connector. Measure the resistance of the (K22) TP Sensor No. 1 Signal circuit from the Throttle Body harness connector 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 9 . No Repair the excessive resistance in the (K22) TP Sensor 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) .
9. RESISTANCE IN THE (K122) TP SENSOR NO. 2 SIGNAL CIRCUIT Measure the resistance of the (K122) TP Sensor No. 2 Signal circuit from the Throttle Body harness connector 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 10 . No Repair the excessive resistance in the (K122) TP Sensor 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) .
10. (K22) TP SENSOR NO. 2 SIGNAL CIRCUIT SHORTED TO GROUND Measure the resistance between ground and the (K22) TP Sensor No. 1 Signal circuit at the Throttle Body harness connector. Is the resistance above 100k Ohms? Yes Go To 11 . No Repair the short to ground in the (K22) TP Sensor 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) .
11. (K122) TP SENSOR NO. 2 SIGNAL CIRCUIT SHORTED TO GROUND Measure the resistance between ground and the (K122) TP Sensor No. 2 Signal circuit at the Throttle Body harness connector. Is the resistance above 100k Ohms? Yes Go To 12 . No Repair the short to ground in the (K122) TP Sensor 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) .
12. RESISTANCE IN (K922) TP SENSOR RETURN CIRCUIT Measure the resistance of the (K922) TP Sensor Return circuit from the Throttle Body 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 19 . No Repair the excessive resistance in the (K922) TP Sensor Return 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) .
13. RESISTANCE IN THE (F856) 5-VOLT SUPPLY CIRCUIT Turn the ignition off. Disconnect the MAP Sensor 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 (F856) 5-Volt Supply circuit from the MAP 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 14 . No Repair the excessive resistance in the (F856) 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) .
14. (F856) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND Measure the resistance between ground and the (F856) 5-Volt Supply circuit in the MAP Sensor harness connector. Is the resistance above 100k Ohms? Yes Go To 15 . No Repair the short to ground in the (F856) 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) .
15. MAP SENSOR Connect the PCM harness connectors. Ignition on, engine not running. With a scan tool, monitor the MAP Sensor voltage. Connect a jumper wire between the (K1) MAP Signal circuit and the (K900) Sensor ground circuit. Cycle the ignition switch from off to on. With a scan tool, monitor the MAP Sensor voltage. Does the scan tool display MAP voltage from approximately 4.9 Volts to below 0.5 Volt with the jumper wire installed? Yes 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) . No Go To 16 . NOTE: Remove the jumper wire before continuing.
16. RESISTANCE IN THE (K1) MAP SIGNAL CIRCUIT Turn the ignition off. Disconnect the C2 PCM harness connector. Measure the resistance of the (K1) MAP Signal circuit from the MAP 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 17 . No Repair the excessive resistance in the (K1) MAP 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) .
17. (K1) MAP SIGNAL CIRCUIT SHORTED TO GROUND Measure the resistance between ground and the (K1) MAP Signal circuit in the MAP Sensor harness connector. Is the resistance above 100k Ohms? Yes Go To 18 . No Repair the short to ground in the (K1) MAP 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) .
18. RESISTANCE IN (K900) SENSOR GROUND CIRCUIT Measure the resistance of the (K900) Sensor ground circuit from the MAP 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 19 . 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) .
19. POWERTRAIN CONTROL MODULE (PCM) Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the MAP Sensor, Throttle Body, 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 MAP Sensor, Throttle Body, 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) .

P2175-LOW AIRFLOW/RESTRICTION DETECTED (SLOW ACCUMULATION)

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

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.

Ignition on and engine running with no MAP Sensor DTCs.

The Powertrain Control Module (PCM) calculated MAP value is greater than actual MAP value plus an offset value. One trip fault and the code will set within five seconds. Three good trips to turn of the mil. ETC light will flash.

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

1. ACTIVE DIAGNOSTIC TROUBLE CODE (DTC) NOTE: The most likely cause of this DTC is a plugged intake air system or dirty Throttle Body. Check for any TSBs before continuing. NOTE: Diagnose any 5-Volt Supply, TP Sensor, Oxygen Sensor, Fuel related or MAP Sensor DTCs before continuing. NOTE: The throttle plate should be free from binding and carbon build up. NOTE: Question the customer about weather conditions, as ice build up on the throttle blade can cause this fault when the ambient air temperature is in the -10°C (14°F) to 4°C (39°F) range. Ignition on, engine not running. 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. RESTRICTED AIR INLET SYSTEM Turn the ignition off. Remove the Air Cleaner Assembly. Remove the Air Filter. Inspect the Throttle Body opening for signs of any foreign materials. Check the intake tube and air cleaner for obstructions; include snow packing questions to customer. Were any restrictions found? Yes Repair the restriction 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. MAP SENSOR OPERATION Start the engine. With a scan tool, monitor the MAP Sensor voltage. Snap the Accelerator pedal. Does the MAP Sensor voltage vary from below 2.0 Volts at idle to above 3.5 Volts at Wide Open Throttle? Yes Go To 4 . No Go To 13 .
4. TP SENSOR OPERATION Ignition on, engine not running. With a scan tool, perform the Throttle Follower Test. TP Sensor No. 1 should start at approximately 0.7 of a Volt and increase to 4.3 Volts. TP Sensor No. 2 should start at approximately 4.3 Volts and decrease to 0.7 of a Volt. Is the voltage transition smooth between the appropriate values? 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 5 .
5. RESISTANCE IN THE (F855) 5-VOLT SUPPLY CIRCUIT Turn the ignition off. Disconnect the Throttle Body harness connector. Disconnect the C2 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 (F855) 5-Volt Supply circuit from the Throttle Body harness connector to the appropriate terminal of PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position). Is the resistance below 100 Ohms? Yes Go To 6 . 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) .
6. (F855) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND Measure the resistance between ground and (F855) 5-Volt Supply circuit at the Throttle Body harness connector. Is the resistance above 100k Ohms? Yes Go To 7 . No 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) .
7. TP SENSOR Connect the PCM harness connector. Ignition on, engine not running. With a scan tool, monitor the TP Sensor voltage. Connect a jumper wire between the (K22) TP Sensor No. 1 Signal circuit and the (K922) TP Sensor Return circuit in the Throttle Body harness connector. TP Sensor No. 1 voltage should start at approximately 4.7 Volts and decrease to 0.3 of a Volt. Connect a jumper wire between the (K122) TP Sensor No. 2 Signal circuit and the (F855) 5-Volt Supply circuit in the Throttle Body harness connector. TP Sensor No. 2 voltage should start at approximately 0.3 Volts and increase to 4.7 Volts. Does the TP Sensor voltage change to the appropriate voltage with the jumper wire installed? Yes Verify that there is good pin to terminal contact in the Throttle Body and Powertrain Control Module connectors. Disconnect the Battery before replacing the Throttle Body Assembly. If OK, replace the Throttle Body Assembly. After installation is complete, use a scan tool and select the ETC RELEARN function. Refer to «THROTTLE BODY, 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 8 .
8. RESISTANCE IN THE (K22) TP SENSOR NO. 1 SIGNAL CIRCUIT Turn the ignition off. Disconnect the C2 PCM harness connector. Measure the resistance of the (K22) TP Sensor No. 1 Signal circuit from the Throttle Body harness connector 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 9 . No Repair the excessive resistance in the (K22) TP Sensor 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) .
9. RESISTANCE IN THE (K122) TP SENSOR NO. 2 SIGNAL CIRCUIT Measure the resistance of the (K22) and (K122) TP Signal circuit from the Throttle Body harness connector 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 10 . No Repair the excessive resistance in the (K122) TP Sensor 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) .
10. (K22) TP SENSOR NO. 2 SIGNAL CIRCUIT SHORTED TO GROUND Measure the resistance between ground and the (K22) TP Sensor No. 1 Signal circuit at the Throttle Body harness connector. Is the resistance above 100k Ohms? Yes Go To 11 . No Repair the short to ground in the (K22) TP Sensor 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) .
11. (K122) TP SENSOR NO. 2 SIGNAL CIRCUIT SHORTED TO GROUND Measure the resistance between ground and the (K122) TP Sensor No. 2 Signal circuit at the Throttle Body harness connector. Is the resistance above 100k Ohms? Yes Go To 12 . No Repair the short to ground in the (K122) TP Sensor 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) .
12. RESISTANCE IN THE (K922) TP SENSOR RETURN CIRCUIT Measure the resistance of the (K922) TP Sensor Return circuit from the Throttle Body 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 19 . No Repair the excessive resistance in the (K922) TP Sensor Return 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) .
13. RESISTANCE IN THE (F856) 5-VOLT SUPPLY CIRCUIT Turn the ignition off. Disconnect the MAP Sensor 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 (F856) 5-Volt Supply circuit from the MAP 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 14 . No Repair the excessive resistance in the (F856) 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) .
14. (F856) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND Measure the resistance between ground and the (F856) 5-Volt Supply circuit in the MAP Sensor harness connector. Is the resistance above 100k Ohms? Yes Go To 15 . No Repair the short to ground in the (F856) 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) .
15. MAP SENSOR Connect the C1 PCM harness connector. Ignition on, engine not running. With a scan tool, monitor the MAP Sensor voltage. Connect a jumper wire between the (K1) MAP Signal circuit and the (K900) Sensor ground circuit. Cycle the ignition switch from off to on. With a scan tool, monitor the MAP Sensor voltage. Does the scan tool display MAP voltage from approximately 4.9 Volts to below 0.5 Volt with the jumper wire installed? Yes 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) . No Go To 16 . NOTE: Remove the jumper wire before continuing.
16. RESISTANCE IN THE (K1) MAP SIGNAL CIRCUIT Turn the ignition off. Disconnect the C2 PCM harness connector. Measure the resistance of the (K1) MAP Signal circuit from the MAP 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 17 . No Repair the excessive resistance in the (K1) MAP 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) .
17. (K1) MAP SIGNAL CIRCUIT SHORTED TO GROUND Measure the resistance between ground and the (K1) MAP Signal circuit in the MAP Sensor harness connector. Is the resistance above 100k Ohms? Yes Go To 18 . No Repair the short to ground in the (K1) MAP 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) .
18. RESISTANCE IN THE (K900) SENSOR GROUND CIRCUIT Measure the resistance of the (K900) Sensor ground circuit from the MAP 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 19 . 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) .
19. POWERTRAIN CONTROL MODULE (PCM) Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the MAP Sensor, Throttle Body, 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 MAP Sensor, Throttle Body, 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 427

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

The Powertrain Control Module (PCM) predicts what the engine coolant temperature should be, based on the engine coolant temperature at start-up, ambient temperature and how the vehicle is subsequently driven. The predicted engine coolant temperature is compared to the Engine Coolant Temperature Sensor reading. The error between the two is calculated and integrated with respect to time. When the Thermostat diagnostic runs, the integrated error is compared to a calibrated threshold and pass/fail is determined. Separate pass and fail thresholds are used in order to improve accuracy of the diagnostic.

Ignition on, Engine running and no ECT DTCs present.

Powertrain Control Module (PCM) recognizes that the ECT Sensor has failed its self coherence test. The coolant temp should only change at a certain rate, if this rate is too slow or too fast this fault will set. Two trip fault. Three good trips to clear MIL. The MIL and ETC light will illuminate.

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

Scheme 428

Scheme 429

Scheme 430

Scheme 431

Scheme 432

Scheme 433

1. ACTIVE DTC Ignition on, engine not running. NOTE: If this code sets during extreme ambient temperatures, improper installation of a block heater may cause this DTC to set. With the scan tool, select View DTCs. Diagnose all other ECT and Cooling System codes before continuing. 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. LOW COOLANT LEVEL NOTE: If an Engine Coolant Temperature (ECT) DTC is set along with this code, diagnose the ECT DTC first. NOTE: Inspect the ECT Sensor terminals and related PCM terminals. Make sure the terminals are free from corrosion and damage. NOTE: The best way to diagnose this DTC is to allow the vehicle to sit overnight outside in order to cold soak the engine. NOTE: Extreme cold ambient temperatures may cause this DTC to set. NOTE: Inspect that there are no changes to the Cooling System that would make the warm up much slower or much faster: worn water pump, addition of aftermarket auxiliary cooler or a performance thermostat. WARNING: Never open the cooling system when the engine is hot. The system is under pressure. Failure to follow these instructions can result in personal injury or death. Allow the engine to cool before opening the cooling system. Inspect the coolant system for proper level and condition. Refer to «DIAGNOSIS AND TESTING»(/jeep/grand-cherokee/wk2-2010-2013/remont/accessory-drive-belts/#engine-cooling-system) . Is the coolant level and condition OK? Yes Go To 3 . No Inspect the vehicle for a coolant leak and add the necessary amount of coolant. Refer to «SPECIFICATIONS»(/jeep/grand-cherokee/wk2-2010-2013/remont/accessory-drive-belts/#engine-cooling-system__specifications) . 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. THERMOSTAT NOTE: This test works best if performed on a cold engine (cold soak). Ignition on, engine not running. With the scan tool, read the Eng Coolant Tmp Deg value. If the engine was allowed to sit overnight (cold soak), the temperature value should be a value that is 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 Eng Coolant Tmp Deg value. The temp deg value change should be a smooth transition from start up to normal operating temp 82° C (180° F). Also monitor the actual coolant temperature with a thermometer. NOTE: As the engine warms up to operating temperature, the actual coolant temperature (thermometer reading) and the Eng Coolant Tmp Deg on the scan tool should stay relatively close to each other. Using the appropriate Service Information, determine the proper opening temperature of the thermostat. Refer to «THERMOSTAT, DESCRIPTION»(/jeep/grand-cherokee/wk2-2010-2013/remont/accessory-drive-belts/#engine-cooling-system) . Did the thermostat open at the proper temperature? Yes Go To 4 . No Replace the thermostat. 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. ECT SENSOR Turn the ignition off. Disconnect the ECT Sensor harness connector. With the scan tool, read the ECT voltage. Connect a jumper between the (K2) ECT Signal circuit and the (K900) Sensor ground circuit in the ECT Sensor harness connector. Is the voltage below 1.0 Volt with the jumper wired installed? Yes Verify that there is good pin to terminal contact in the ECT Sensor and Powertrain Control Module connectors. If OK, replace the ECT 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) . No Go To 5 .
5. (K2) ECT SIGNAL CIRCUIT SHORTED TO VOLTAGE Turn the ignition off. Disconnect the C2 PCM harness connector. Ignition on, engine not running. Measure the voltage on the (K2) ECT Signal circuit in the ECT Sensor harness connector. Is there any voltage present? Yes Repair the short to voltage in the (K2) ECT 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. (K2) ECT SIGNAL 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 (K2) ECT Signal circuit from the ECT 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 open or excessive resistance in the (K2) ECT 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) .
7. (K900) SENSOR GROUND CIRCUIT OPEN Measure the resistance of the (K900) Sensor ground circuit from the ECT 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 8 . No Repair the open or 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) .
8. (K2) ECT SIGNAL CIRCUIT SHORTED TO GROUND Measure the resistance between ground and the (K2) ECT Signal circuit in the ECT Sensor harness connector. Is the resistance below 100 Ohms? Yes Repair the short to ground in the (K2) ECT 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. (K2) ECT SIGNAL CIRCUIT SHORTED TO THE (K900) SENSOR GROUND CIRCUIT Measure the resistance between the (K2) ECT Signal circuit and the (K900) Sensor ground circuit in the ECT Sensor harness connector. Is the resistance below 5.0 Ohms? Yes Repair the short between the (K900) Sensor ground and the (K2) ECT 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 10 .
10. POWERTRAIN CONTROL MODULE (PCM) Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the ECT 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 ECT Sensor and Powertrain Control Module connectors. Perform any Technical Service Bulletins (TSBs) 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) .

P219A-AIR-FUEL RATIO CYLINDER IMBALANCE BANK 1

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

The fuel feedback system will maintain a stoichiometric air/fuel mixture, 14.7:1, by modifying the injector pulsewidth according to the oxygen content of the exhaust gas. The Powertrain Control Module (PCM) makes short term and long term fuel corrections to maintain stoiciometric air/fuel ratio for best catalytic converter efficiency. If one or more cylinders do not operate at stoichiometric then the high frequency content of the O2 sensor will increase. Short term fuel correction is based on upstream O2 sensor output and is designed for quick engine response. The long term fuel correction compensated for variations in the engine specifications, sensor tolerances and component aging and is designed to correct rich and lean conditions over a longer period of time.

Engine Coolant Temperature (ECT) is greater than 70 °C (158 °F), Engine run time of 90 seconds, engine RPM 1000 - 2700, engine load 30 - 90% and in flex fuel vehicles the Fuel Adaptive Learned must be completed.

P113D is not set and the high frequency content of the O2 sensor exceeds a calibrated amount. 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 434

Scheme 435

Scheme 436

1. ACTIVE DIAGNOSTIC TROUBLE CODE (DTC) NOTE: Check for contaminates 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 the 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 Fuel System test and observe the fuel pressure gauge. NOTE: Fuel pressure specification: For 3.6L is 400 kPa +/- 14 kPa (58 psi +/- 2 psi) For 5.7L is 407 kPa +/- 34 kPa (59 psi +/- 5 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. 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) . CAUTION: Before Proceeding Stop All Actuations.
3. O2 SENSOR OPERATION Start the engine. Allow the engine to reach normal operating temperature. NOTE: If one of the O2 Sensors Signal or Return circuit is shorted to ground or voltage, all the other O2 Sensor voltage readings will be affected. 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 1/1 O2 Sensor voltage reading. Is the voltage switching between 2.5 and 3.4 Volts? Yes Go To 4 . No Go To 9 .
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. Using the scan tool, perform the 1/1 O2 Heater Test. Using the scan tool, monitor the O2 Sensor voltage while performing the Heater test for at least two minutes. Does the voltage stay above 4.5 Volts during the Heater test? Yes Verify that there is good pin to terminal contact in the O2 Sensor and Powertrain Control Module connectors. Replace the 1/1 O2 Sensor if no problems were found with the connectors. 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 Ignition on, engine not running. With the scan tool, read the Barometric Pressure. NOTE: The Barometric Pressure should be approximately equal to the actual barometric pressure. If necessary, compare the Barometric Pressure value of this vehicle to the value of a known good vehicle of a similar make and model. 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. With the scan tool, read the MAP Sensor vacuum value. Is the scan tool reading for MAP Vacuum within 1 inch of the Vacuum Gauge reading and is the Barometric Pressure reading of the vehicle the approximately the same as actual Barometric Pressure? Yes Go To 6 . No Verify that there is good pin to terminal contact in the MAP Sensor and Powertrain Control Module connectors. Replace the MAP Sensor if no problems were found with the connectors. 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) . NOTE: Remove the vacuum gauge before continuing.
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 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 Engine Coolant Temperature value. The temp value change should be a smooth transition from start up to normal operating temp 82° C (180° F). The value should reach at least 82° C (180° F). Did the ECT value increase smoothly and 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. Replace the Engine Coolant Temperature Sensor if no problems were found with the connectors. 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. EVAP PURGE SOLENOID OPERATION Turn the ignition off. Disconnect the hoses at the EVAP Purge Solenoid. Using a hand vacuum pump, apply 10 inches of vacuum to the EVAP Purge Solenoid vacuum source port on the component side. Did the EVAP Purge Solenoid hold vacuum? Yes Go To 8 . No Verify that there is good pin to terminal contact in the Solenoid and Powertrain Control Module connectors. Replace the EVAP Purge Solenoid if no problems were found with the connectors. Refer to «SOLENOID, EVAPORATIVE EMISSIONS PURGE, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#emissions-control) . 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) . NOTE: Connect the vacuum hoses before continuing.
8. ENGINE MECHANICAL 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 12 .
9. 1/1 O2 SENSOR NOTE: Perform the following test on the O2 Sensors whose voltage was not switching properly in the previous step. 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) O2 Sensor 1/1 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 down to 2.5 Volts with the jumper wire connected. Did the O2 Sensor voltage drop 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 O2 Sensor and Powertrain Control Module connectors. Replace the 1/1 O2 Sensor if no problems were found with the connectors. 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 10 . NOTE: Remove the jumper wire before continuing.
10. (K41) O2 SENSOR 1/1 SIGNAL CIRCUIT Measure the voltage on the (K41) O2 Sensor 1/1 Signal circuit in the O2 Sensor harness connector. Is the voltage between 4.1 and 5.0 Volts? Yes Go To 11 . No Check the (K41) O2 Sensor 1/1 Signal circuit for damage, 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. (K902) O2 SENSOR RETURN UPSTREAM CIRCUIT Measure the voltage on the (K902) O2 Return Upstream circuit in the 1/1 O2 Sensor harness connector. Is the voltage at 2.5 Volts? Yes Go To 12 . No Check the (K902) O2 Return Upstream circuit for damage, 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) . NOTE: Turn the ignition off before continuing.
12. POWERTRAIN CONTROL MODULE (PCM) Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the 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 1/1 O2 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) .

P219B-AIR-FUEL RATIO CYLINDER IMBALANCE BANK 2

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

The fuel feedback system will maintain a stoichiometric air/fuel mixture, 14.7:1, by modifying the injector pulsewidth according to the oxygen content of the exhaust gas. The Powertrain Control Module (PCM) makes short term and long term fuel corrections to maintain stoiciometric air/fuel ratio for best catalytic converter efficiency. If one or more cylinders do not operate at stoichiometric then the high frequency content of the O2 sensor will increase. Short term fuel correction is based on upstream O2 sensor output and is designed for quick engine response. The long term fuel correction compensated for variations in the engine specifications, sensor tolerances and component aging and is designed to correct rich and lean conditions over a longer period of time.

Engine Coolant Temperature (ECT) is greater than 70 °C (158 °F), Engine run time of 90 seconds, engine RPM 1000 - 2700, engine load 30 - 90% and in flex fuel vehicles the Fuel Adaptive Learned must be completed.

P113E is not set and the high frequency content of the O2 sensor exceeds a calibrated amount. 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 contaminates 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 the 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 Fuel System test and observe the fuel pressure gauge. NOTE: Fuel pressure specification: For 3.6L is 400 kPa +/- 14 kPa (58 psi +/- 2 psi) For 5.7L is 407 kPa +/- 34 kPa (59 psi +/- 5 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) . CAUTION: Before Proceeding Stop All Actuations.
3. O2 SENSOR OPERATION Start the engine. Allow the engine to reach normal operating temperature. NOTE: If one of the O2 Sensors Signal or Return circuit is shorted to ground or voltage, all the other O2 Sensor voltage readings will be affected. 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 9 .
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. Ignition on, engine not running. Using the scan tool, perform the 2/1 O2 Heater Test for each O2 Sensor. Using the scan tool, monitor the 2/1 O2 Sensor voltage while performing the Heater test for at least two minutes. Does the voltage stay above 4.5 Volts for each Sensor? Yes Verify that there is good pin to terminal contact in the O2 Sensor and Powertrain Control Module connectors. Replace the 2/1 O2 Sensor if no problems were found with the connectors. 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 5 .
5. MAP SENSOR OPERATION Ignition on, engine not running. With the scan tool, read the Barometric Pressure. NOTE: The Barometric Pressure should be approximately equal to the actual barometric pressure. If necessary, compare the Barometric Pressure value of this vehicle to the value of a known good vehicle of a similar make and model. 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 for MAP Vacuum within 1" of Hg on the Vacuum Gauge reading and is the Barometric Pressure reading of the vehicle the approximately the same as actual Barometric Pressure? Yes Go To 6 . No Verify that there is good pin to terminal contact in the MAP Sensor and Powertrain Control Module connectors. Replace the MAP Sensor if no problems were found with the connectors. 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) . NOTE: Remove the vacuum gauge before continuing.
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 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 Engine Coolant Temperature value. The temp value change should be a smooth transition from start up to normal operating temp 82° C (180° F). The value should reach at least 82° C (180° F). Did the ECT value increase smoothly and 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. Replace the Engine Coolant Temperature Sensor if no problems were found with the connectors. 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. EVAP PURGE SOLENOID OPERATION Turn the ignition off. Disconnect the hoses at the EVAP Purge Solenoid. Using a hand vacuum pump, apply 10 inches of vacuum to the EVAP Purge Solenoid vacuum source port on the component side. Did the EVAP Purge Solenoid hold vacuum? Yes Go To 8 . No Verify that there is good pin to terminal contact in the EVAP Purge Solenoid and Powertrain Control Module connectors. Replace the EVAP Purge Solenoid if no problems were found with the connectors. Refer to «SOLENOID, EVAPORATIVE EMISSIONS PURGE, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#emissions-control) . 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) . NOTE: Connect the vacuum hoses before continuing.
8. ENGINE MECHANICAL 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 12 .
9. 2/1 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 down to 2.5 Volts with the jumper wire connected. Did the O2 Sensor voltage drop 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 O2 Sensor and Powertrain Control Module connectors. Replace the 2/1 O2 Sensor if no problems were found with the connectors. 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 10 . NOTE: Remove the jumper wire before continuing.
10. O2 SENSOR SIGNAL CIRCUIT Measure the voltage on the (K43) O2 Sensor 2/1 Signal circuit in the O2 Sensor harness connector. Is the voltage between 4.1 and 5.0 Volts? Yes Go To 11 . No Check the (K43) O2 Sensor 2/1 Signal circuit for damage, 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. (K902) O2 SENSOR 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 12 . No Check the (K902) O2 Return Upstream circuit for damage, 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) . NOTE: Turn the ignition off before continuing.
12. POWERTRAIN CONTROL MODULE (PCM) Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the 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 2/1 O2 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 437

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

The Oxygen sensors (O2 sensor) are used for fuel control and catalyst monitoring. Each O2 sensor compares the oxygen content of the surrounding air with the oxygen content of the exhaust stream. When the engine is started, the Powertrain Control Module (PCM) operates in an Open Loop mode, ignoring the O2 sensor signal voltage while calculating the air-to-fuel ratio. The heating elements inside each O2 sensor heat the sensor to bring the sensor up to operating conditions faster. This allows the system to enter Closed Loop earlier and the PCM to calculate the air-to-fuel ratio sooner. While the engine runs, the O2 sensor heats up and begins to generate a voltage within a range of 0-1, 275 mV. Once sufficient O2 sensor voltage fluctuation is observed by the PCM, Closed Loop is entered. The PCM uses the O2 sensor voltage to determine the air-to-fuel ratio. An O2 sensor voltage that increases toward 1, 000 mV indicates a rich fuel mixture. An O2 sensor voltage that decreases toward 0 mV indicates a lean fuel mixture.

Continuously after 15 seconds of engine runtime, no O2 sensor heater DTCs present and battery voltage greater than 10.4 Volts.

The Oxygen Sensor reference voltage is below 0.9 of a Volt for 60 seconds. The DTC will set as Pending after one trip and Active after two trips. Three good trips to turn off the MIL.

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

Scheme 438

1. ACTIVE DTC NOTE: The most likely cause of this DTC is (K902) O2 Return circuit shorted to ground Ignition on, engine not running. With the scan tool, select View DTCs. Copy DTC and Freeze Frame information. Start the engine. 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. Allow the engine to reach normal operating temperature. Monitor the scan tool for at least two minutes. With the scan tool, select View DTCs. Is the status Active for this DTC? Yes Go To 2 . No Perform the INTERMITTENT 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. (K902) O2 RETURN (UPSTREAM) CIRCUIT SHORTED TO GROUND Turn the ignition off. Disconnect the C1 and C2 PCM harness connectors. Disconnect the 1/1 O2 Sensor harness connector. Disconnect the 2/1 O2 Sensor harness connector. Measure the resistance between ground and the (K902) O2 Return (Upstream) circuit reference voltage circuit at the O2 Sensor 1/1 or 2/1 harness connector. Is the resistance below 10k Ohms? Yes Repair the (K902) O2 Return (Upstream) circuit for a short to ground. 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. 1/1 OR 2/1 O2 SENSOR Turn the ignition off. Connect the C1 and C2 PCM harness connectors. Ignition on, engine not running. With the scan tool, monitor the 1/1 and 2/1 O2 Sensor voltage. Connect a jumper wire between the (K41) O2 1/1 Signal circuit and the (K902) O2 Return (Upstream) circuit in the O2 Sensor harness connector. Repeat step 5 for the (K141) O2 Sensor 2/1 Signal circuit Is the voltage between 2.3 and 2.7 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. Replace the O2 Sensor not indicating the specified voltage if no problems were found with the connections. 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 4 . NOTE: Remove the jumper wire before continuing.
4. POWERTRAIN CONTROL MODULE (PCM) Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Oxygen 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 Sensor and 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) .

P2246-O2 SENSOR 1/1, 2/1 REFERENCE VOLTAGE CIRCUIT HIGH

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

The Oxygen sensors (O2 sensor) are used for fuel control and catalyst monitoring. Each O2 sensor compares the oxygen content of the surrounding air with the oxygen content of the exhaust stream. When the engine is started, the Powertrain Control Module (PCM) operates in an Open Loop mode, ignoring the O2 sensor signal voltage while calculating the air-to-fuel ratio. The heating elements inside each O2 sensor heat the sensor to bring the sensor up to operating conditions faster. This allows the system to enter Closed Loop earlier and the PCM to calculate the air-to-fuel ratio sooner. While the engine runs, the O2 sensor heats up and begins to generate a voltage within a range of 0-1, 275 mV. Once sufficient O2 sensor voltage fluctuation is observed by the PCM, Closed Loop is entered. The PCM uses the O2 sensor voltage to determine the air-to-fuel ratio. An O2 sensor voltage that increases toward 1, 000 mV indicates a rich fuel mixture. An O2 sensor voltage that decreases toward 0 mV indicates a lean fuel mixture.

Engine running for 15 seconds, O2 Sensors at operating temperature and battery voltage greater 10.4 Volts.

The PCM detects that the (K902) Reference Signal voltage is greater than 3.9 Volts for nine seconds.

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

Scheme 439

Scheme 440

1. DTC IS ACTIVE Ignition on, engine not running. With the scan tool, select View DTCs. Copy DTC and Freeze Frame information. Start the engine. 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. Allow the engine to reach normal operating temperature. Monitor the scan tool for at least two minutes. With the scan tool, select View DTCs. Is the status Active for this DTC? Yes Go To 2 . No Perform the INTERMITTENT 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. (K902) O2 REFERENCE SIGNAL CIRCUIT SHORTED TO VOLTAGE Turn the ignition off. Disconnect the C1 and C2 PCM harness connectors. Disconnect the 1/1 O2 Sensor harness connector. Disconnect the 2/1 O2 Sensor harness connector. Turn the ignition on. Measure the voltage of the (K902) O2 Return (Upstream) circuit reference voltage circuit at the O2 Sensor 1/1 or 2/1 harness connector. Is there any voltage present? Yes Repair the (K902) O2 Reference Signal circuit for a short to voltage. 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. (K902) O2 REFERENCE SIGNAL CIRCUIT OPEN OR HIGH RESISTANCE CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install the PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position) to perform diagnosis. Measure the resistance of the (K902) O2 Return (Upstream) circuit reference voltage circuit at the O2 Sensor 1/1 or 2/1 harness connector and the appropriate terminal of PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position). Is the resistance below 10.0 Ohms? Yes Go To 4 . No Repair the (K902) 02 1/1 or 2/1 Reference Signal circuit for an open circuit or 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) .
4. O2 SENSOR Turn the ignition off. Connect the PCM harness connector. Ignition on, engine not running. With the scan tool, monitor the 1/1 and 2/1 O2 Sensor voltage. Connect a jumper wire between the (K41) O2 1/1 Signal circuit and the (K902) O2 Return (Upstream) circuit in the O2 Sensor harness connector. Repeat step 5 for the (K141) O2 Sensor 2/1 Signal circuit Is the voltage between 2.3 and 2.7 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. Replace the O2 Sensor not indicating the specified voltage if no problems were found with the connections. 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 . NOTE: Remove the jumper wire before continuing.
5. POWERTRAIN CONTROL MODULE Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Oxygen Sensor and the PCM. Look for any chafed, pierced, pinched or partially broken wires. Look for broken, bent, pushed out or corroded terminals. 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 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) .

P2271-O2 SENSOR 1/2 SIGNAL STUCK RICH

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

The downstream O2 Sensor is located in the exhaust path behind the catalytic converter and is monitored for proper response to assure optimum catalytic converter efficiency. The downstream O2 response monitor is intended to diagnose a downstream O2 sensor that is not moving or stuck in a voltage window and to insure accurate information for catalyst monitor diagnosis.

With the engine running, vehicle speed above 96 kph (60 mph), throttle open for a minimum of 120 seconds, ECT greater than 70° C (158° F), catalytic converter temperature greater than 600° C (1112° F) and downstream oxygen sensor in a rich state. During a decel fuel shutoff event, the downstream oxygen sensor should switch from rich to lean within a specific time.

The PCM monitors the downstream O2 sensor. If the PCM does not detect a rich to lean switch within a specific time during a decel fuel shutoff event, the monitor will fail. 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. DIAGNOSTIC TROUBLE CODE (DTC) IS ACTIVE 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. NOTE: It may be necessary to test drive the vehicle within the DTC monitoring conditions in order for this DTC to set. With 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. CHECKING THE OXYGEN SENSOR OPERATION NOTE: Check for signs of contaminants that may have damaged the O2 Sensor, such as contaminated fuel, unapproved silicone, oil and coolant. Perform the diagnostic procedure for CHECKING THE OXYGEN SENSOR OPERATION. Refer to «CHECKING THE OXYGEN SENSOR OPERATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#driveability-gas-non-dtc-based-diagnostics__checking-the-oxygen-sensor-operation) . 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 Go To 3 .
3. POWERTRAIN CONTROL MODULE (PCM) Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the 1/2 O2 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 the 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 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) .

P2273-O2 SENSOR 2/2 SIGNAL STUCK RICH

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

The downstream O2 Sensor is located in the exhaust path behind the catalytic converter, is monitored for proper response to assure optimum catalytic converter efficiency. The downstream O2 response monitor is intended to diagnose a downstream O2 sensor that is not moving or stuck in a voltage window and to insure accurate information for catalyst monitor diagnosis.

With the engine running, vehicle speed above 96 kph (60 mph), throttle open for a minimum of 120 seconds, ECT greater than 70 C (158 F), catalytic converter temperature greater than 600° C (1112° F) and downstream oxygen sensor in a rich state. During a decel fuel shutoff event, the downstream oxygen sensor should switch from rich to lean within a specific time.

The Powertrain Control Module (PCM) monitors the downstream O2 sensor. If the PCM does not detect a rich to lean switch within a specific time during a decel fuel shutoff event, the monitor will fail. 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. DIAGNOSTIC TROUBLE CODE (DTC) IS ACTIVE 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. NOTE: It may be necessary to test drive the vehicle within the DTC monitoring conditions in order for this DTC to set. With 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. CHECKING THE OXYGEN SENSOR OPERATION NOTE: Check for signs of contaminants that may have damaged the O2 Sensor, such as contaminated fuel, unapproved silicone, oil and coolant. Perform the diagnostic procedure for CHECKING THE OXYGEN SENSOR OPERATION. Refer to «CHECKING THE OXYGEN SENSOR OPERATION»(/jeep/grand-cherokee/wk2-2010-2013/remont/testing-diagnostics/#driveability-gas-non-dtc-based-diagnostics__checking-the-oxygen-sensor-operation) . 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 Go To 3 .
3. POWERTRAIN CONTROL MODULE (PCM) Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the 2/2 O2 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 the 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 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) .

P2299-BRAKE PEDAL POSITION/ACCELERATOR PEDAL POSITION INCOMPATIBLE

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

Ignition on. No Break or APPS faults present.

The PCM recognizes a brake application following the APPS showing a fixed pedal opening. Temporary or permanent. Internally the PCM will reduce throttle opening below driver demand. One trip fault and the code will be set within five seconds. ETC light will illuminate, the light will only stay illuminated while DTC is active.

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

1. DTC INFORMATION NOTE: If a pedal assembly becomes mechanically stuck the voltage output will stay fixed, if this is also Followed by a long application of the brakes this code will set. NOTE: When this code sets the pedal position in the PCM software will ramp to idle. If the Pedal voltage changes OR the brake pedal is released, the pedal position in the PCM software will ramp up to the pedal position and the ETC light will go out. With the scan tool, read DTCs and record the related Freeze Frame data. Diagnose all other Stop Lamp Switch and APP Sensor codes before continuing. This code can be set by a driver who uses both feet while driving, one for the Accelerator Pedal and the other for the Brake Pedal. NOTE: The most likely cause of this DTC is caused by the customer Brake Torquing the engine by pressing the Accelerator pedal and the pressing the Brake Pedal. Ask the driver of the vehicle if these conditions apply to their driving habits. Are the listed conditions part of the customers driving habits? Yes Advise the customer of what caused the DTC. This is normal operation of a ETC equipped vehicle because of safety issues. 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 2 .
2. STOP LAMP SWITCH OPERATION With the scan tool, read both Stop Lamp Switch statuses while pressing and releasing the Brake Pedal. Does the scan tool display the Pressed and Released while pressing and releasing the Pedal? Yes Go To 3 . No Check the Stop Lamp Switch for proper installation and check the related circuits for opens and shorts using the appropriate wiring diagram. If OK, replace the Stop Lamp Switch assembly. 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. APP SENSOR SWEEP Ignition on, engine not running. With the scan tool, monitor both APP Sensor voltage readings. Slowly press the accelerator pedal from idle until it reaches the end stop near the floor. APPS No. 1 voltage should start at approximately 0.45 of a Volt and increase to approximately 4.6 Volts with a smooth transition. APPS No. 2 voltage should start at approximately 0.22 of a Volt and increase to approximately 2.31 Volts with a smooth transition. Does the voltage for the appropriate sensor follow the list specification? 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 Check the Signal and Return circuits for opens and shorts. If OK, Replace the APP Sensor Assembly in accordance with the Service Information. Refer to «PEDAL, ACCELERATOR, REMOVAL»(/jeep/grand-cherokee/wk2-2010-2013/remont/fuel-system/#fuel-system) . After installation is complete, with a scan tool select the ETC RELEARN function to relearn the APPS values. 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 441

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

Engine running and battery voltage greater than 10.0 Volts.

If the Powertrain Control Module (PCM) detects that the secondary ignition burn time is incorrect, too short, or not present, an error is detected. 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 442

Scheme 443

Scheme 444

Scheme 445

1. ACTIVE DTC NOTE: Diagnose any ASD related DTCs before continuing. Start the engine. With a scan tool, select View 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 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. (F344) ASD RELAY OUTPUT CIRCUIT Turn the ignition off. Disconnect the Coil on Plug harness connector. Ignition on, engine not running. With a scan tool, actuate the ASD Relay. Using a 12-volt test light connected to ground, probe the (F344) ASD Relay Output circuit in the Coil on Plug harness connector. Does the test light illuminate brightly? Yes Go To 3 . No Repair the open or short to ground in the (F344) ASD Relay Output circuit between the IPM and Coil harness connector. 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) . NOTE: Stop All Actuations.
3. IGNITION COIL 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 a 12-volt test light connected to a 12 Volt source, probe the (K19) OR (K86) Coil Control No. 1 circuit. Crank the engine for five seconds while observing the test light. What is the condition of the test light while cranking the engine? Brightly blinking. Go To 4 . ON constantly. Go To 5 . OFF constantly. Go To 6 .
4. SPARK PLUG Turn the ignition off. Remove the Spark Plug(s) in accordance with the Service Information. Inspect the Spark Plug(s) for the following conditions: Cracks Carbon Tracking Foreign Material Gap size out of specifications Loose or broken electrode NOTE: Lightly tap the bottom of the spark plug on a solid surface. The electrode in the spark plug should not move. Were any of the above conditions present? Yes Replace the Spark Plug in accordance with the Service Information. NOTE: If carbon tracking is found on the Spark Plug, inspect the boot assembly for signs of damage and replace if 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 Coil On Plug and Spark Plug 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. (K19) OR (K86) COIL CONTROL NO. 1 CIRCUIT SHORTED TO GROUND Turn the ignition off. Disconnect the PCM C2 harness connector. Measure the resistance between ground and the (K19) OR (K86) Coil Control No. 1 circuit in the Coil on Plug harness connector. Is the resistance below 100 Ohms? Yes Repair the short to ground in the (K19) OR (K86) Coil Control No. 1 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 .
6. (K19) OR (K86) COIL CONTROL NO. 1 CIRCUIT OPEN Turn the ignition off. Disconnect the PCM C2 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 (K19) OR (K86) Coil Control No. 1 circuit from the Coil on Plug harness connector to the appropriate terminal of the 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 (K19) OR (K86) Coil Control No. 1 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 Ignition Coil 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 Ignition Coil and the 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 (PCM) in accordance 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 446

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

Engine running and battery voltage greater than 10.0 Volts.

If the Powertrain Control Module (PCM) detects that the secondary ignition burn time is incorrect, too short or not present, an error is detected. 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 447

1. ACTIVE DTC NOTE: Diagnose any ASD related DTCs before continuing. Start the engine. With the scan tool, select View 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 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. (F344) ASD RELAY OUTPUT CIRCUIT Turn the ignition off. Disconnect the Coil on Plug harness connector. Ignition on, engine not running. With the scan tool, actuate the ASD Relay. Using a 12-volt test light connected to ground, probe the (F344) ASD Relay Output circuit in the Coil on Plug harness connector. Does the test light illuminate brightly? Yes Go To 3 . No Repair the open or short to ground in the (F344) ASD Relay Output circuit between the IPM and Coil harness connector. 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) . NOTE: Stop All Actuations.
3. IGNITION COIL 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 a 12-volt test light connected to a 12 Volt source, probe the (K17) or (K85) Coil Control No. 2 circuit. Crank the engine for five seconds while observing the test light. What is the condition of the test light while cranking the engine? Brightly blinking. Go To 4 . ON constantly. Go To 5 . OFF constantly. Go To 6 .
4. SPARK PLUG Turn the ignition off. Remove the Spark Plug(s) in accordance with the Service Information. Inspect the Spark Plug(s) for the following conditions: Cracks Carbon Tracking Foreign Material Gap size out of specifications Loose or broken electrode NOTE: Lightly tap the bottom of the spark plug on a solid surface. The electrode in the spark plug should not move. Were any of the above conditions present? Yes Replace the Spark Plug in accordance with the Service Information. NOTE: If carbon tracking is found on the Spark Plug, inspect the boot assembly for signs of damage and replace if 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 Coil On Plug and Spark Plug 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. (K17) OR (K85) COIL CONTROL NO. 2 CIRCUIT SHORTED TO GROUND Turn the ignition off. Disconnect the PCM C2 harness connector. Measure the resistance between ground and the (K17) or (K85) Coil Control No. 2 circuit in the Coil on Plug harness connector. Is the resistance below 100 Ohms? Yes Repair the short to ground in the (K17) or (K85) Coil Control No. 2 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 .
6. (K17) OR (K85) COIL CONTROL NO. 2 CIRCUIT OPEN Turn the ignition off. Disconnect the PCM C2 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 (K17) or (K85) Coil Control No. 2 circuit from the Coil on Plug harness connector to the appropriate terminal of the 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 (K17) or (K85) Coil Control No. 2 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 Ignition Coil 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 Ignition Coil and the 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 (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 448

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

Engine running and battery voltage greater than 10.0 Volts.

If the Powertrain Control Module (PCM) detects that the secondary ignition burn time is incorrect, too short or not present, an error is detected. 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 449

1. ACTIVE DTC NOTE: Diagnose any ASD related DTCs before continuing. Start the engine. With the scan tool, select View 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 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. (F344) ASD RELAY OUTPUT CIRCUIT Turn the ignition off. Disconnect the Coil on Plug harness connector. Ignition on, engine not running. With the scan tool, actuate the ASD Relay. Using a 12-volt test light connected to ground, probe the (F344) ASD Relay Output circuit in the Coil on Plug harness connector. Does the test light illuminate brightly? Yes Go To 3 . No Repair the open or short to ground in the (F344) ASD Relay Output circuit between the IPM and Coil harness connector. 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) . NOTE: Stop All Actuations.
3. IGNITION COIL 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 a 12-volt test light connected to a 12 Volt source, probe the (K18) or (K93) Coil Control No. 3 circuit. Crank the engine for five seconds while observing the test light. What is the condition of the test light while cranking the engine? Brightly blinking. Go To 4 . ON constantly. Go To 5 . OFF constantly. Go To 6 .
4. SPARK PLUG Turn the ignition off. Remove the Spark Plug(s) in accordance with the Service Information. Inspect the Spark Plug(s) for the following conditions: Cracks Carbon Tracking Foreign Material Gap size out of specifications Loose or broken electrode NOTE: Lightly tap the bottom of the spark plug on a solid surface. The electrode in the spark plug should not move. Were any of the above conditions present? Yes Replace the Spark Plug in accordance with the Service Information. NOTE: If carbon tracking is found on the Spark Plug, inspect the boot assembly for signs of damage and replace if 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 Coil On Plug and Spark Plug 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. (K18) OR (K93) COIL CONTROL NO. 3 CIRCUIT SHORTED TO GROUND Turn the ignition off. Disconnect the PCM C2 harness connector. Measure the resistance between ground and the (K18) or (K93) Coil Control No. 3 circuit in the Coil on Plug harness connector. Is the resistance below 100 Ohms? Yes Repair the short to ground in the (K18) or (K93) Coil Control NO. 3 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 .
6. (K18) OR (K93) COIL CONTROL NO. 3 CIRCUIT OPEN Turn the ignition off. Disconnect the PCM C2 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 (K18) or (K93) Coil Control No. 3 circuit from the Coil on Plug harness connector to the appropriate terminal of the 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 (K18) or (K93) Coil Control No. 3 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 Ignition Coil 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 Ignition Coil and the 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 (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 450

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

Engine running and battery voltage greater than 10.0 Volts.

If the Powertrain Control Module (PCM) detects that the secondary ignition burn time is incorrect, too short or not present, an error is detected. 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 451

1. ACTIVE DTC NOTE: Diagnose any ASD related DTCs before continuing. Start the engine. With the scan tool, select View 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 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. (F344) ASD RELAY OUTPUT CIRCUIT Turn the ignition off. Disconnect the Coil on Plug harness connector. Ignition on, engine not running. With the scan tool, actuate the ASD Relay. Using a 12-volt test light connected to ground, probe the (F344) ASD Relay Output circuit in the Coil on Plug harness connector. Does the test light illuminate brightly? Yes Go To 3 . No Repair the open or short to ground in the (F344) ASD Relay Output circuit between the TIPM and Coil harness connector. 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) . NOTE: Stop All Actuations.
3. IGNITION COIL 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 a 12-volt test light connected to a 12 Volt source, probe the (K15) Coil Control No. 4 circuit. Crank the engine for five seconds while observing the test light. What is the condition of the test light while cranking the engine? Brightly blinking. Go To 4 . ON constantly. Go To 5 . OFF constantly. Go To 6 .
4. SPARK PLUG Turn the ignition off. Remove the Spark Plug(s) in accordance with the Service Information. Inspect the Spark Plug(s) for the following conditions: Cracks Carbon Tracking Foreign Material Gap size out of specifications Loose or broken electrode NOTE: Lightly tap the bottom of the spark plug on a solid surface. The electrode in the spark plug should not move. Were any of the above conditions present? Yes Replace the Spark Plug in accordance with the Service Information. NOTE: If carbon tracking is found on the Spark Plug, inspect the boot assembly for signs of damage and replace if 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 Coil On Plug and Spark Plug 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. (K15) COIL CONTROL NO. 4 CIRCUIT SHORTED TO GROUND Turn the ignition off. Disconnect the PCM C2 harness connector. Measure the resistance between ground and the (K15) Coil Control No. 4 circuit in the Coil on Plug harness connector. Is the resistance below 100 Ohms? Yes Repair the short to ground in the (K15) Coil Control No. 4 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 .
6. (K15) COIL CONTROL NO. 4 CIRCUIT OPEN Turn the ignition off. Disconnect the PCM C2 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 (K15) Coil Control No. 4 circuit from the Coil on Plug harness connector to the appropriate terminal of the 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 (K15) Coil Control No. 4 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 Ignition Coil 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 Ignition Coil and the 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 (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 452

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

Engine running and battery voltage greater than 10.0 Volts.

If the Powertrain Control Module (PCM) detects that the secondary ignition burn time is incorrect, too short or not present, an error is detected. 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 453

1. ACTIVE DTC NOTE: Diagnose any ASD related DTCs before continuing. Start the engine. With the scan tool, select View 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 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. (F344) ASD RELAY OUTPUT CIRCUIT Turn the ignition off. Disconnect the Coil on Plug harness connector. Ignition on, engine not running. With the scan tool, actuate the ASD Relay. Using a 12-volt test light connected to ground, probe the (F344) ASD Relay Output circuit in the Coil on Plug harness connector. Does the test light illuminate brightly? Yes Go To 3 . No Repair the open or short to ground in the (F344) ASD Relay Output circuit between the TIPM and Coil harness connector. 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) . NOTE: Stop All Actuations.
3. IGNITION COIL 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 a 12-volt test light connected to a 12 Volt source, probe the (K16) Coil Control No. 5 circuit. Crank the engine for five seconds while observing the test light. What is the condition of the test light while cranking the engine? Brightly blinking. Go To 4 . ON constantly. Go To 5 . OFF constantly. Go To 6 .
4. SPARK PLUG Turn the ignition off. Remove the Spark Plug(s) in accordance with the Service Information. Inspect the Spark Plug(s) for the following conditions: Cracks Carbon Tracking Foreign Material Gap size out of specifications Loose or broken electrode NOTE: Lightly tap the bottom of the spark plug on a solid surface. The electrode in the spark plug should not move. Were any of the above conditions present? Yes Replace the Spark Plug in accordance with the Service Information. NOTE: If carbon tracking is found on the Spark Plug, inspect the boot assembly for signs of damage and replace if 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 Coil On Plug and Spark Plug 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. (K16) COIL CONTROL NO. 5 CIRCUIT SHORTED TO GROUND Turn the ignition off. Disconnect the PCM C2 harness connector. Measure the resistance between ground and the (K16) Coil Control No. 5 circuit in the Coil on Plug harness connector. Is the resistance below 100 Ohms? Yes Repair the short to ground in the (K16) Coil Control No. 5 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 .
6. (K16) COIL CONTROL NO. 5 CIRCUIT OPEN Turn the ignition off. Disconnect the PCM C2 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 (K16) Coil Control No. 5 circuit from the Coil on Plug harness connector to the appropriate terminal of the 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 (K16) Coil Control No. 5 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 Ignition Coil 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 Ignition Coil and the 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 (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 454

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

Engine running and battery voltage greater than 10.0 Volts.

If the Powertrain Control Module (PCM) detects that the secondary ignition burn time is incorrect, too short or not present, an error is detected. 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 455

1. ACTIVE DTC NOTE: Diagnose any ASD related DTCs before continuing. Start the engine. With the scan tool, select View 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 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. (F344) ASD RELAY OUTPUT CIRCUIT Turn the ignition off. Disconnect the Coil on Plug harness connector. Ignition on, engine not running. With the scan tool, actuate the ASD Relay. Using a 12-volt test light connected to ground, probe the (F344) ASD Relay Output circuit in the Coil on Plug harness connector. Does the test light illuminate brightly? Yes Go To 3 . No Repair the open or short to ground in the (F344) ASD Relay Output circuit between the TIPM and Coil harness connector. 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) . NOTE: Stop All Actuations.
3. IGNITION COIL 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 a 12-volt test light connected to a 12 Volt source, probe the (K10) Coil Control No. 6 circuit. Crank the engine for five seconds while observing the test light. What is the condition of the test light while cranking the engine? Brightly blinking. Go To 4 . ON constantly. Go To 5 . OFF constantly. Go To 6 .
4. SPARK PLUG Turn the ignition off. Remove the Spark Plug(s) in accordance with the Service Information. Inspect the Spark Plug(s) for the following conditions: Cracks Carbon Tracking Foreign Material Gap size out of specifications Loose or broken electrode NOTE: Lightly tap the bottom of the spark plug on a solid surface. The electrode in the spark plug should not move. Were any of the above conditions present? Yes Replace the Spark Plug in accordance with the Service Information. NOTE: If carbon tracking is found on the Spark Plug, inspect the boot assembly for signs of damage and replace if 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 Coil On Plug and Spark Plug 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. (K10) COIL CONTROL NO. 6 CIRCUIT SHORTED TO GROUND Turn the ignition off. Disconnect the PCM C2 harness connector. Measure the resistance between ground and the (K10) Coil Control No. 6 circuit in the Coil on Plug harness connector. Is the resistance below 100 Ohms? Yes Repair the short to ground in the (K10) Coil Control No. 6 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 .
6. (K10) COIL CONTROL NO. 6 CIRCUIT OPEN Turn the ignition off. Disconnect the PCM C2 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 (K10) Coil Control No. 6 circuit from the Coil on Plug harness connector to the appropriate terminal of the 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 (K10) Coil Control NO. 6 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 Ignition Coil 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 Ignition Coil and the 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 (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 456

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

Engine running and battery voltage greater than 10.0 Volts.

If the Powertrain Control Module (PCM) detects that the secondary ignition burn time is incorrect, too short or not present, an error is detected. 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 457

Scheme 458

Scheme 459

Scheme 460

1. ACTIVE DTC NOTE: Diagnose any ASD related DTCs before continuing. Start the engine. With the scan tool, select View 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 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. (F344) ASD RELAY OUTPUT CIRCUIT Turn the ignition off. Disconnect the Coil on Plug harness connector. Ignition on, engine not running. With the scan tool, actuate the ASD Relay. Using a 12-volt test light connected to ground, probe the (F344) ASD Relay Output circuit in the Coil on Plug harness connector. Does the test light illuminate brightly? Yes Go To 3 . No Repair the open or short to ground in the (F344) ASD Relay Output circuit between the TIPM and Coil harness connector. 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) . NOTE: Stop All Actuations.
3. IGNITION COIL 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 a 12-volt test light connected to a 12 Volt source, probe the (K97) Coil Control No. 7 circuit. Crank the engine for five seconds while observing the test light. What is the condition of the test light while cranking the engine? Brightly blinking. Go To 4 . ON constantly. Go To 5 . OFF constantly. Go To 6 .
4. SPARK PLUG Turn the ignition off. Remove the Spark Plug(s) in accordance with the Service Information. Inspect the Spark Plug(s) for the following conditions: Cracks Carbon Tracking Foreign Material Gap size out of specifications Loose or broken electrode NOTE: Lightly tap the bottom of the spark plug on a solid surface. The electrode in the spark plug should not move. Were any of the above conditions present? Yes Replace the Spark Plug in accordance with the Service Information. NOTE: If carbon tracking is found on the Spark Plug, inspect the boot assembly for signs of damage and replace if 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 Coil On Plug and Spark Plug 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. (K97) COIL CONTROL NO. 7 CIRCUIT SHORTED TO GROUND Turn the ignition off. Disconnect the PCM C1 harness connector. Measure the resistance between ground and the (K97) Coil Control No. 7 circuit in the Coil on Plug harness connector. Is the resistance below 100 Ohms? Yes Repair the short to ground in the (K97) Coil Control No. 7 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 .
6. (K97) COIL CONTROL NO. 7 CIRCUIT OPEN Turn the ignition off. Disconnect the PCM C1 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 (K97) Coil Control No. 7 circuit from the Coil on Plug harness connector to the appropriate terminal of the 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 (K97) Coil Control No. 7 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 Ignition Coil 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 Ignition Coil and the 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 (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 461

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

Engine running and battery voltage greater than 10.0 Volts.

If the Powertrain Control Module (PCM) detects that the secondary ignition burn time is incorrect, too short or not present, an error is detected. 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 462

1. ACTIVE DTC NOTE: Diagnose any ASD related DTCs before continuing. Start the engine. With the scan tool, select View 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 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. (F344) ASD RELAY OUTPUT CIRCUIT Turn the ignition off. Disconnect the Coil on Plug harness connector. Ignition on, engine not running. With the scan tool, actuate the ASD Relay. Using a 12-volt test light connected to ground, probe the (F344) ASD Relay Output circuit in the Coil on Plug harness connector. Does the test light illuminate brightly? Yes Go To 3 . No Repair the open or short to ground in the (F344) ASD Relay Output circuit between the TIPM and Coil harness connector. 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) . NOTE: Stop All Actuations.
3. IGNITION COIL 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 a 12-volt test light connected to a 12 Volt source, probe the (K98) Coil Control NO. 8 circuit. Crank the engine for five seconds while observing the test light. What is the condition of the test light while cranking the engine? Brightly blinking. Go To 4 . ON constantly. Go To 5 . OFF constantly. Go To 6 .
4. SPARK PLUG Turn the ignition off. Remove the Spark Plug(s) in accordance with the Service Information. Inspect the Spark Plug(s) for the following conditions: Cracks Carbon Tracking Foreign Material Gap size out of specifications Loose or broken electrode NOTE: Lightly tap the bottom of the spark plug on a solid surface. The electrode in the spark plug should not move. Were any of the above conditions present? Yes Replace the Spark Plug in accordance with the Service Information. NOTE: If carbon tracking is found on the Spark Plug, inspect the boot assembly for signs of damage and replace if 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 Coil On Plug and Spark Plug 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. (K98) COIL CONTROL NO. 8 CIRCUIT SHORTED TO GROUND Turn the ignition off. Disconnect the PCM C1 harness connector. Measure the resistance between ground and the (K98) Coil Control No. 8 circuit in the Coil on Plug harness connector. Is the resistance below 100 Ohms? Yes Repair the short to ground in the (K98) Coil Control No. 8 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 .
6. (K98) COIL CONTROL NO. 8 CIRCUIT OPEN Turn the ignition off. Disconnect the PCM C1 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 (K98) Coil Control No. 8 circuit from the Coil on Plug harness connector to the appropriate terminal of the 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 (K98) Coil Control No. 8 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 Ignition Coil 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 Ignition Coil and the 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 (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) .

See also:
• PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE
• CHECKING THE PCM POWER AND GROUND CIRCUITS
• MODULE, POWERTRAIN CONTROL, REMOVAL
• DIAGNOSTIC CODE INDEX
• TANK, FUEL, REMOVAL
• BODY, AIR CLEANER, REMOVAL, 3.6L
• BODY, AIR CLEANER, REMOVAL, 5.7L
• CHECKING THE FUEL DELIVERY SYSTEM
• CHECKING THE OXYGEN SENSOR OPERATION
• DIAGNOSIS AND TESTING
• SPECIFICATIONS
• SOLENOID, EVAPORATIVE EMISSIONS PURGE, REMOVAL
• SWITCH, STOP LAMP, REMOVAL
• P2067
• P2068