Diagnostic Test

WARNING: This page is about a different car, the 2016 Jeep Wrangler and 2015 Jeep Wrangler. However, it is still accessible from the selected car via links, so may be relevant.

CHECK FOR AN ACTIVE DTC
NOTE:
Diagnose and repair any VVT Solenoid Circuit Open or Slow Response DTCs before continuing with this test.
1. Turn the ignition on.
2. With the scan tool, read DTCs and record on the repair order.
3. Record the related Freeze Frame data.
4. With the scan tool, erase DTCs.
5. Start the engine and allow it to idle. It maybe necessary to tests drive the vehicle and allow cam phasing to occur in order to reset the fault.
  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.
6. With the scan tool, read DTCs.
  Is the DTC active or pending?
  
  Yes
  - Go To 2
  No
  - Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to INTERMITTENT CONDITION .
ENGINE OIL/ENGINE MECHANICAL
NOTE:
The following items should be checked before continuing with this procedure. Failure to do so may lead to misdiagnosis.
- ENGINE MECHANICAL TOLERANCES OUT OF SPECIFICATION
- ENGINE OIL PRESSURE OUT OF SPECIFICATION
- LOW ENGINE OIL LEVEL
- INCORRECT ENGINE OIL FILTER (DOES NOT MEET OEM SPECIFICATIONS)
- DETERIORATED OR DIRTY OIL
- CONTAMINATED ENGINE OIL
- INCORRECT ENGINE OIL VISCOSITY
- AERATED ENGINE OIL
1. If any of the above conditions are found, repair as necessary.
  Were any of the above conditions present?
  
  Yes
  - Repair the engine oiling or mechanical condition (i.e. improper oil drain back, oil sludge, damaged oil pump, pick-up tube or seal, etc.).
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 3
CHECK THE ENGINE OIL PRESSURE AND ENGINE MECHANICAL CONDITION
1. Install the applicable adaptor to the oil filter cap and install an oil pressure gauge to the adaptor. If the adaptor is not available, monitor the oil pressure reading with the scan tool.
2. Start the engine and allow it to idle.
3. Monitor the engine oil pressure reading on the gauge or scan tool.
  NOTE:
  If the oil pressure is below 14 psi or oscillating excessively, it can cause a delay in Cam Phaser movement sufficient enough to set a slow response DTC.
  
  Is the oil pressure reading stable and above 14.0 psi?
  
  Yes
  - Go To 4
  No
  - Repair the engine oiling or mechanical condition (i.e. improper oil drain back, oil sludge, damaged oil pump, pick-up tube or seal, etc.).
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
CHECK THE CAM PHASER POSITION
NOTE:
If a Cam Phaser or Oil Control Valve is stuck, there may also be a Camshaft Position Slow Response and/or Multiple Cylinder Misfire DTC present.
1. With the scan tool, monitor and compare the Bank 2 Exhaust Cam desired position value with the Bank 2 Exhaust Cam actual position value.
  Is the difference between the actual value and the desired value more than 6.0 degrees?
  
  Yes
  - Go To 5
  No
  - Go To 8
DETERMINE IF THE CAM PHASER IS ELECTRICALLY OR MECHANICALLY STUCK
1. While the engine is at idle, disconnect the VVT Exhaust Solenoid 2/2 harness connector.
2. The Bank 2 Exhaust Cam actual position value should change to lock pin with the solenoid disconnected. The Bank 2 Exhaust Cam position should be at approximately 127.0 degrees at lock pin.
  Did the Bank 2 Exhaust Cam actual value change to within 6.0 degrees of the lock pin position with the solenoid unplugged?
  
  Yes
  - Check the (K277) VVT Exhaust Solenoid 2/2 Control circuit for a short to voltage. If the circuit is not shorted to voltage, replace the Powertrain Control Module in accordance with the service information.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 6
CHECK THE CAMSHAFT 2/2 OIL CONTROL VALVE OPERATION
1. Turn the ignition off.
2. Remove the VVT Exhaust Solenoid 2/2.
3. Inspect the spring loaded spool valve on the Camshaft 2/2 Oil Control Valve.
  NOTE:
  The spring loaded spool valve should be flush with the surface of the Oil Control Valve when at rest.
4. Push and release the spring loaded spool valve against the return spring with a small punch.
  NOTE:
  The spring loaded spool valve should move freely without binding and return to the flush position if there are no problems with the Oil Control Valve.
  
  Was the spring loaded spool valve flush and able to move freely?
  
  Yes
  - Go To 7
  No
  - Replace the Camshaft 2/2 Oil Control Valve in accordance with the Service Information. The "Cam/Crank Relearn" 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 "Cam/Crank Relearn" Procedure.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
CHECK THE ENGINE TIMING ALIGNMENT
1. Verify proper alignment of the timing chain and sprockets in accordance with the Service Information.
  Is the timing alignment correct?
  
  Yes
  - Replace the Cam Phaser assembly in accordance with the Service Information. Refer to ASSEMBLY, VARIABLE VALVE TIMING, PHASER / OIL CONTROL VALVE, REMOVAL . The "Cam/Crank Relearn" 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 "Cam/Crank Relearn" Procedure.
  No
  - Reset the valve timing to specification in accordance with the Service Information. The "Cam/Crank Relearn" 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 "Cam/Crank Relearn" Procedure.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
CAMSHAFT POSITION SENSOR CIRCUIT WIRING OR CONNECTORS
1. Turn the ignition off.
2. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the CMP Sensor 2 and the Powertrain Control Module (PCM).
3. Look for any chafed, pierced, pinched, or partially broken wires.
4. Verify that there is good pin to terminal contact in the CMP Sensor 2 and the PCM connectors.
5. Look for broken, bent, pushed out, or corroded terminals.
6. Inspect the CMP Sensor 2 for conditions such as loose mounting screws, damage or cracks.
  Were any problems found?
  
  Yes
  - Perform the appropriate repair.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 9
CRANKSHAFT POSITION SENSOR CIRCUIT WIRING OR CONNECTORS
1. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the CKP Sensor and the PCM.
2. Look for any chafed, pierced, pinched, or partially broken wires.
3. Look for broken, bent, pushed out, or corroded terminals.
4. Verify that there is good pin to terminal contact in the CKP Sensor and the PCM connectors.
5. Remove the CKP Sensor.
6. Inspect the CKP Sensor, mounting area, and tone wheel for any condition that would result in an incorrect signal, such as damage, foreign material or excessive movement.
  Were any problems found?
  
  Yes
  - Perform the appropriate repair. The "Cam/Crank Relearn" 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 "Cam/Crank Relearn" Procedure.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 10
CAMSHAFT, TONE WHEEL, OR PULSE RING
1. Turn the ignition off.
2. Remove the CMP Sensor.
3. Inspect the CMP Sensor, mounting area, and tone wheel for any condition that would result in an incorrect signal, such as damage, evidence of foreign material or excessive movement.
  Were any problems found?
  
  Yes
  - Perform the appropriate repair. The "Cam/Crank Relearn" 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 "Cam/Crank Relearn" Procedure.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 11
CAMSHAFT POSITION SENSOR IRREGULAR SIGNAL
1. Turn the ignition off.
2. Install all previously removed components and reconnect all connectors.
3. Using a lab scope and a back probing tool, back probe the (K444) CMP Sensor Signal 2/1 circuit at the CMP Sensor 2 harness connector.
4. Start the engine.
5. Wiggle the related wire harness and lightly tap on the CMP Sensor while monitoring the lab scope screen.
  Did the CMP Sensor 2/1 signal appear irregular or missing any High/Low transitions?
  
  Yes
  - Replace the CMP Sensor in accordance with the Service Information. Refer to SENSOR, CAMSHAFT POSITION, 3.6L, REMOVAL . The "Cam/Crank Relearn" 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 "Cam/Crank Relearn" Procedure.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 12
CRANKSHAFT POSITION SENSOR IRREGULAR SIGNAL
1. Turn the ignition off.
2. Using a lab scope and a back probing tool, back probe the (K24) CKP Signal circuit at the CKP Sensor harness connector.
3. Start the engine.
4. Wiggle the related wire harness and lightly tap on the CKP Sensor while monitoring the lab scope screen.
  Did the CKP Sensor signal appear irregular or missing any High/Low transitions?
  
  Yes
  - Replace the CKP Sensor in accordance with the Service Information. Refer to SENSOR, CRANKSHAFT POSITION, REMOVAL . The "Cam/Crank Relearn" 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 "Cam/Crank Relearn" Procedure.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 13
CHECK RELATED PCM AND COMPONENT CONNECTIONS
1. Perform any Service Bulletins that apply.
2. Disconnect all PCM harness connectors.
3. Disconnect all related in-line harness connections (if equipped).
4. Disconnect the related component harness connectors.
5. 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.
6. Reconnect all PCM harness connectors. Be certain that all harness connectors are fully seated and the connector locks are fully engaged.
7. Reconnect all in-line harness connectors (if equipped). Be certain that all connectors are fully seated and the connector locks are fully engaged.
8. Reconnect all related component harness connectors. Be certain that all connectors are fully seated and the connector locks are fully engaged.
9. With the scan tool, erase DTCs.
10. Test drive or operate the vehicle in accordance with the when monitored and set conditions.
11. With the scan tool, read DTCs.
  Did the DTC return?
  
  Yes
  - Replace the Powertrain Control Module in accordance with the Service information. Refer to MODULE, POWERTRAIN CONTROL, REMOVAL .
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  - Test complete.