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Diagnostic Test

WARNING: This page is about a different car, the 2024 Jeep Grand Wagoneer L and 2024 Jeep Grand Wagoneer. However, it is still accessible from the selected car via links, so may be relevant.
  1. READ AND RECORD DTCS AND ENVIRONMENTAL DATA - ERASE DTCS AND CHECK FOR THE DTC TO RETURN 
    1. With the scan tool, read DTCs in all Electronic Control Units (ECUs) and record on the repair order.
    2. For future reference, with the scan tool, run and save a vehicle Scan Report and all related recorded data.
    3. With the scan tool, erase all DTCs.
    4. Turn the ignition off for a minimum of 10.0 seconds.
    5. Turn the ignition on.
    6. Using the When Monitored and Set Conditions above and recorded data, operate the vehicle in the conditions that set the DTC.
    7. With the scan tool, read DTCs.

      Did the DTC return?

      Yes 

      • Go To  2

      No 

  2. CHECK FOR APPLICABLE SERVICE BULLETINS 
    1. Check for any applicable Service Bulletins for this issue.

      Were there any applicable Service Bulletins?

      Yes 

      • Perform the applicable Service Bulletin. Erase the DTC and perform the verification test.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  3
  3. CHECK FOR OTHER DTCS 
    1. Refer to the recorded DTCs.

      Are there any 5-Volt Reference DTCs active or pending?

      Yes 

      No 

      • Go To  4
  4. CHECK THE ENGINE OIL LEVEL AND CONDITION 
    1. Turn the ignition off.
      NOTE:

      Any oiling system issues can affect Cam Phaser operation which could in turn set this DTC.

    2. The following items should be checked before continuing with this procedure. Failure to do so may lead to misdiagnosis.
      • LOW ENGINE OIL LEVEL
      • CONTAMINATED, DIRTY, AERATED OR DETERIORATED ENGINE OIL
      • INCORRECT ENGINE OIL VISCOSITY
      • ENGINE OIL PRESSURE OUT OF SPECIFICATION
      • INCORRECT ENGINE OIL FILTER (DOES NOT MEET OEM SPECIFICATIONS)

      Were any of the above conditions present?

      Yes 

      • Repair as necessary. If the engine oil was not at the proper level, top off the engine oil to the proper specification. Start the engine and allow it to idle for 2 - 3 minutes. Turn the engine off, ignition on, and using the scan tool, erase the DTC. Start the engine and drive the vehicle to verify repair. If the DTC does not return, repair is complete.
      • If the DTC returns, Go To  5

      No 

      • Go To  6
  5. CHECK FOR AN ACTIVE DTC 
    1. Turn the ignition on.
    2. With the scan tool, read DTCs and record on the repair order.
    3. Record the Freeze Frame Data.
    4. Start the engine or crank the engine for at least ten seconds.
    5. With the scan tool, read DTCs and record on the repair order.

      Is the DTC active or pending?

      Yes 

      • Go To  8

      No 

      • Go To  6
  6. PERFORM A WIRING HARNESS/CKP SENSOR INSPECTION 
    1. Turn the ignition off.
    2. Disconnect the harness connectors at the PCM and Cam Sensor and inspect for wire chaffing or rub conditions, terminals pushed out on the wiring connector, bent terminals at the PCM and Cam Sensor, water in the connector cavities, presence of corrosion on the terminals of the connectors or components.
    3. Visually inspect the mounting area of Cam Sensor for debris/damage or a loose sensor. Remove the Cam Sensor and inspect the end of the sensor for signs of damage or debris. Rotate the engine and if possible, inspect the target wheel for any signs of damage. Reinstall the Cam Sensor and ensure that the sensor is properly installed and torqued to proper specification.
      NOTE:

      Due to the fact that this DTC is set by an intermittent loss of the signal, the most likely cause is a poor connection at the Cam Sensor or PCM terminals, or a poor signal between the Cam Sensor and target wheel. Because of this, unplugging and reconnecting the harness connectors, or repositioning the Cam Sensor will often repair the condition that set the DTC.

      Were any problems found?

      Yes 

      No 

      • Go To  7
  7. CHECK THE VEHICLE'S RECENT REPAIR HISTORY FOR CAM SENSOR RELATED DTCS 
    1. Check the history of the vehicle for previous Cam Sensor related DTCs within the past 30 days. Verify if the Cam Sensor was replaced during the visit.

      Did the repair history show that the vehicle was in dealership for a Cam Sensor fault within the past 30 days?

      Yes, and the Cam Sensor was replaced on previous visit 

      • Wiggle test the wiring harness and connectors again and try to duplicate the issue. If not able to duplicate, remove the Cam Sensor, and visually inspect the sensor mounting location for damage, foreign material.
      • Inspect the target wheel for any signs of damage.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      Yes, and the Camshaft Position 1/2 Sensor was not replaced on previous visit 

      • Replace the Camshaft Position 1/2 Sensor in accordance with the Service Information. The "Timing sensor and / or camshaft replacement" procedure  must be performed every time there has been a repair/replacement made to a CMP Sensor and/or CKP sensor, flywheel, valvetrain, timing chain or gears. Failure to do so can cause a misfire fault to set. With the scan tool, perform the "Timing sensor and / or camshaft replacement" procedure.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Test complete. Reconnect the harness connectors, and erase the DTC. The most likely cause was a poor connection at one of the harness connectors. Verify the DTC does not return.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  8. CHECK THE (F856) 5-VOLT SUPPLY CIRCUIT VOLTAGE 
    1. Turn the ignition off.
    2. Disconnect the Camshaft Position (CMP) 1/2 Sensor harness connector.
    3. Turn the ignition on.
    4. Measure the voltage between the (F856) 5-Volt Supply circuit and the (K914) Ground circuit at the CMP 1/2 Sensor harness connector.

      Is the voltage between 4.8 and 5.2 volts?

      Yes 

      • Go To  9

      No 

      • Go To  14
  9. CHECK THE (K441) CMP 1/2 SIGNAL CIRCUIT VOLTAGE 
    1. Measure the voltage on the (K441) CMP 1/2 Signal circuit at the CMP 1/2 Sensor harness connector.

      Is the voltage between 4.8 and 5.2 volts?

      Yes 

      • Go To  10

      No 

      • Go To  19
  10. CHECK FOR THE (F856) 5-VOLT SUPPLY CIRCUIT SHORTED TO THE (K441) CMP 1/2 SIGNAL CIRCUIT 
    1. Turn the ignition off.
    2. Disconnect the PCM C2 harness connector.
    3. Check for continuity between the (F856) 5-Volt Supply circuit and the (K441) CMP 1/2 Signal circuit at the CMP 1/2 Sensor harness connector.

      Is there continuity between the (F856) 5-Volt Supply circuit and the (K441) CMP 1/2 Signal circuit?

      Yes 

      • Repair the (F856) 5-Volt Supply circuit for a short to the (K441) CMP 1/2 Signal circuit.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  11
  11. INSPECT THE CAM SENSOR MOUNTING AND TONE WHEEL/PULSE RING 
    1. Disconnect the Battery ground cable.
    2. Remove the CMP 1/2 Sensor.
    3. Visually inspect the sensor mounting location for damage, foreign material.
    4. Rotate the engine and if possible inspect the target wheel for any signs of damage.

      Were any problems found?

      Yes 

      • Repair Issues in mounting location. Repair or replace the Tone Wheel/Pulse Ring as necessary. The "Timing sensor and / or camshaft replacement" procedure  must be performed every time there has been a repair/replacement made to a CMP 1/2 Sensor and/or CKP sensor, flywheel, valvetrain, timing chain or gears. Failure to do so can cause a misfire fault to set. With the scan tool, perform the "Timing sensor and / or camshaft replacement" procedure.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  12
  12. INSPECT THE WIRING / REPLACE THE CMP 1/2 SENSOR AND RETEST FOR DTC 
    1. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Camshaft Position Sensor 1/2 and the Powertrain Control Module (PCM).
    2. Look for any chafed, pierced, pinched or partially broken wires.
    3. Look for broken, bent, pushed out or corroded terminals.
    4. Replace the Camshaft Position Sensor in accordance with the Service Information. Refer to CAMSHAFT POSITION (CMP) SENSOR - EXHAUST and/or CAMSHAFT POSITION (CMP) SENSOR - INTAKE . The "Timing sensor and / or camshaft replacement" procedure  must be performed every time there has been a repair/replacement made to a CMP 1/2 Sensor and/or CKP sensor, flywheel, valvetrain, timing chain or gears. Failure to do so can cause a misfire fault to set. With the scan tool, perform the "Timing sensor and / or camshaft replacement" procedure.
    5. Turn the ignition on.
    6. With the scan tool, erase DTCs.
    7. Start the engine or crank the engine for ten seconds.

      Did the DTC return?

      Yes 

      • Go To  13

      No 

      • Replacing the Camshaft Position 1/2 Sensor repaired the fault.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  13. CHECK RELATED HARNESS CONNECTIONS 
    1. Disconnect all PCM harness connectors.
    2. Disconnect all related in-line harness connections (if equipped).
    3. Disconnect the related component harness connectors.
    4. Inspect harness connectors, component connectors, and all male and female terminals for the following conditions:
      • Proper connector installation.
      • Damaged connector locks.
      • Corrosion.
      • Other signs of water intrusion.
      • Weather seal damage (if equipped).
      • Bent terminals.
      • Overheating due to a poor connection (terminal may be discolored due to excessive current draw).
      • Terminals that have been pushed back into the connector cavity.
      • Check for spread terminals and verify proper terminal tension.

      Repair any conditions that are found.

    5. Reconnect all PCM harness connectors. Be certain that all harness connectors are fully seated and the connector locks are fully engaged.
    6. Reconnect all in-line harness connectors (if equipped). Be certain that all connectors are fully seated and the connector locks are fully engaged.
    7. Reconnect all related component harness connectors. Be certain that all connectors are fully seated and the connector locks are fully engaged.
    8. With the scan tool, erase DTCs.
    9. Test drive or operate the vehicle in accordance with the when monitored and set conditions.
    10. With the scan tool, read DTCs.

      Did the DTC return?

      Yes 

      No 

  14. CHECK THE (F856) 5-VOLT SUPPLY CIRCUIT FOR A SHORT TO VOLTAGE 
    1. Measure the voltage on the (F856) 5-Volt Supply circuit at the CMP 1/2 Sensor harness connector.

      Is the voltage above 5.2 volts?

      Yes 

      • Repair the (F856) 5-Volt Supply circuit for a short to voltage.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  15
  15. CHECK THE (F856) 5-VOLT SUPPLY CIRCUIT FOR A SHORT TO GROUND 
    1. Turn the ignition off.
    2. Disconnect the PCM C2 harness connector.
    3. Check for continuity between ground and the (F856) 5-Volt Supply circuit at the CMP 1/2 Sensor harness connector.

      Is there continuity between ground and the (F856) 5-Volt Supply circuit?

      Yes 

      • Repair the (F856) 5-Volt Supply circuit for a short to ground.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  16
  16. CHECK FOR THE (F856) 5-VOLT SUPPLY CIRCUIT SHORTED TO THE (K914) SENSOR GROUND CIRCUIT 
    1. Check for continuity between the (F856) 5-Volt Supply circuit and the (K914) Sensor Ground circuit in the CMP 1/2 Sensor harness connector.

      Is there continuity between the (F856) 5-Volt Supply circuit and the (K914) Sensor Ground circuit?

      Yes 

      • Repair the (F856) 5-Volt Supply circuit for a short to the (K914) Sensor Ground circuit.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  17
  17. CHECK THE (F856) 5-VOLT SUPPLY CIRCUIT FOR AN OPEN/HIGH RESISTANCE 
    1. Measure the resistance of the (F856) 5-Volt Supply circuit between the CMP 1/2 Sensor harness connector and the PCM C2 harness connector.

      Is the resistance below 3.0 Ohms?

      Yes 

      • Go To  18

      No 

      • Repair the (F856) 5-Volt Supply circuit for an open circuit or high resistance.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  18. CHECK THE (K914) SENSOR GROUND CIRCUIT FOR AN OPEN/HIGH RESISTANCE 
    1. Measure the resistance of the (K914) Sensor Ground circuit between the CMP 1/2 Sensor harness connector and the PCM harness connector.

      Is the resistance below 3.0 Ohms?

      Yes 

      • Go To  25

      No 

      • Repair the (K914) Sensor Ground circuit for an open circuit or high resistance.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  19. CHECK THE (K441) CMP 1/2 SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE 
    1. Turn the ignition off.
    2. Disconnect the PCM C2 harness connector.
    3. Turn the ignition on.
    4. Measure the voltage on the (K441) CMP 1/2 Signal circuit in the CMP 1/2 Sensor harness connector.

      Is there any voltage present?

      Yes 

      • Repair the (K441) CMP 1/2 Signal circuit for a short to voltage.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  20
  20. CHECK THE (K441) CMP 1/2 SIGNAL CIRCUIT FOR A SHORT TO GROUND 
    1. Turn the ignition off.
    2. Check for continuity between ground and the (K441) CMP 1/2 Signal circuit at the CMP 1/2 Sensor harness connector.

      Is there continuity between ground and the (K441) CMP 1/2 Signal circuit?

      Yes 

      • Repair the (K441) CMP 1/2 Signal circuit for a short to ground.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  21
  21. CHECK FOR THE (K441) CMP 1/2 SIGNAL CIRCUIT SHORTED TO THE (K914) SENSOR GROUND CIRCUIT 
    1. Check for continuity between the (K441) CMP 1/2 Signal circuit and the (K914) Sensor Ground circuit at the CMP 1/2 Sensor harness connector.

      Is there continuity between the (K441) CMP 1/2 Signal circuit and the (K914) Sensor Ground circuit?

      Yes 

      • Repair the (K441) CMP 1/2 Signal circuit for a short to the (K914) Sensor Ground circuit.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  22
  22. CHECK THE (K441) CMP 1/2 SIGNAL CIRCUIT FOR AN OPEN/HIGH RESISTANCE 
    1. Measure the resistance of the (K441) CMP 1/2 Signal circuit between the CMP 1/2 Sensor harness connector and the PCM C2 harness connector.

      Is the resistance below 3.0 Ohms?

      Yes 

      • Go To  23

      No 

      • Repair the (K441) CMP 1/2 Signal circuit for an open circuit or high resistance.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  23. INSPECT THE CAM SENSOR AND TONE WHEEL/PULSE RING 
    1. Disconnect the battery ground cable.
    2. Remove the CMP 1/2 Sensor.
    3. Visually inspect the sensor mounting location for damage, foreign material.
    4. Rotate the engine and if possible inspect the target wheel for any signs of damage.

      Were any problems found?

      Yes 

      • Repair Issues in mounting location. Repair or replace the Tone Wheel/Pulse Ring as necessary. The "Timing sensor and / or camshaft replacement" procedure  must be performed every time there has been a repair/replacement made to a CMP 1/2 Sensor and/or CKP Sensor, flywheel, valvetrain, timing chain or gears. Failure to do so can cause a misfire fault to set. With the scan tool, perform the "Timing sensor and / or camshaft replacement" procedure.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  24
  24. INSPECT THE WIRING / REPLACE THE CMP 1/2 SENSOR AND RETEST FOR DTC 
    1. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the CMP 1/2 Sensor and the Powertrain Control Module (PCM).
    2. Look for any chafed, pierced, pinched or partially broken wires.
    3. Look for broken, bent, pushed out or corroded terminals.
    4. Replace the Camshaft Position 1/2 Sensor in accordance with the Service Information. Refer to CAMSHAFT POSITION (CMP) SENSOR - EXHAUST and/or CAMSHAFT POSITION (CMP) SENSOR - INTAKE . The " Timing sensor and / or camshaft replacement" procedure  must be performed every time there has been a repair/replacement made to a CMP 1/2 Sensor and/or CKP Sensor, flywheel, valvetrain, timing chain or gears. Failure to do so can cause a misfire fault to set. With the scan tool, perform the "Timing sensor and / or camshaft replacement" procedure.
    5. Turn the ignition on.
    6. With the scan tool, erase DTCs.
    7. Start the engine or crank the engine for ten seconds.

      Did the DTC return?

      Yes 

      • Go To  25

      No 

      • Replacing the Camshaft Position 1/2 Sensor repaired the fault.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  25. CHECK RELATED HARNESS CONNECTIONS 
    1. Disconnect all PCM harness connectors.
    2. Disconnect all related in-line harness connections (if equipped).
    3. Disconnect the related component harness connectors.
    4. Inspect harness connectors, component connectors, and all male and female terminals for the following conditions:
      • Proper connector installation.
      • Damaged connector locks.
      • Corrosion.
      • Other signs of water intrusion.
      • Weather seal damage (if equipped).
      • Bent terminals.
      • Overheating due to a poor connection (terminal may be discolored due to excessive current draw).
      • Terminals that have been pushed back into the connector cavity.
      • Check for spread terminals and verify proper terminal tension.

      Repair any conditions that are found.

    5. Reconnect all PCM harness connectors. Be certain that all harness connectors are fully seated and the connector locks are fully engaged.
    6. Reconnect all in-line harness connectors (if equipped). Be certain that all connectors are fully seated and the connector locks are fully engaged.
    7. Reconnect all related component harness connectors. Be certain that all connectors are fully seated and the connector locks are fully engaged.
    8. With the scan tool, erase DTCs.
    9. Test drive or operate the vehicle in accordance with the when monitored and set conditions.
    10. With the scan tool, read DTCs.

      Did the DTC return?

      Yes 

      No 

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