2012 Jeep Wrangler JK Factory Service Manual 28 - DTC-Based Diagnostics

P1524-OIL PRESSURE OUT OF RANGE - CAMSHAFT ADVANCE/RETARD DISABLED

P1524-OIL PRESSURE OUT OF RANGE - CAMSHAFT ADVANCE/RETARD DISABLED

For a complete wiring diagram, refer to the Wiring Information.


Theory of Operation

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


Possible Causes

ENGINE OIL/ENGINE MECHANICAL
(G6) ENGINE OIL PRESSURE SENSOR SIGNAL CIRCUIT SHORTED TO VOLTAGE
RESISTANCE (G6) ENGINE OIL PRESSURE SENSOR SIGNAL CIRCUIT
(G6) ENGINE OIL PRESSURE SENSOR SIGNAL CIRCUIT SHORTED TO GROUND
RESISTANCE IN (F855) 5-VOLT SUPPLY CIRCUIT
(F855) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND
RESISTANCE IN THE (K900) SENSOR GROUND CIRCUIT
ENGINE OIL PRESSURE SENSOR
POWERTRAIN CONTROL MODULE (PCM)

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).


1. ACTIVE DTC



NOTE: Make sure that the engine oil is at the proper level. Also, check the customers oil change history to verify that the oil is being changed at the correct intervals and that the proper oil viscosity is being used.
1. Start the engine and allow it to reach normal operating temperature.

WARNING:

When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts or fan. Do not wear loose clothing. Failure to follow these instructions may result in possible serious or fatal injury.


NOTE: Diagnose and repair any system voltage or sensor supply voltage DTCs before continuing with this test.


Is the DTC Active at this time?

Yes


No


2. ENGINE OIL/ENGINE MECHANICAL



NOTE: The following items must be considered before determining the cause of this DTC. Failure to do so may lead to misdiagnosis. For the VCT to enable the oil pressure has to be approximately 42 psi. For the VCT to remain enabled the engine oil pressure can not drop below 31 psi. When checking the engine oil pressure use a mechanical gauge.

  • ENGINE MECHANICAL TOLERANCES OUT OF SPECIFICATION
  • ENGINE OIL PRESSURE OUT OF SPECIFICATION
  • LOW ENGINE OIL
  • OIL DIRTY OR DETERIORATED (Lack of scheduled oil changes)
  • CORRECT VISCOSITY
  • ENGINE OIL CONTAMINATED (i.e., coolant and/or fuel)
1. If any of the above conditions are found, repair as necessary.


Were any of the above conditions present?

Yes


No


3. ENGINE OIL PRESSURE SENSOR
1. Turn the ignition off.
2. Connect the PCM C2 harness connector.
3. Ignition on, engine not running.
4. With a scan tool, monitor the Engine Oil Pressure Sensor voltage.
5. Connect a jumper wire between the (K900) Sensor Ground circuit and the (G6) Engine Oil Pressure Signal circuit.


NOTE: Engine Oil Pressure voltage should change from approximately 4.5 volts to less than 0.5 of a volt.


Is the voltage reading within the listed specification when the jumper wire is installed?

Yes


No


4. EXCESSIVE RESISTANCE IN THE (G6) ENGINE OIL PRESSURE SIGNAL CIRCUIT
1. Turn the ignition off.
2. Disconnect the PCM C2 harness connector.
3. Measure the resistance of the (G6) Engine Oil Pressure Signal circuit from the Engine Oil Pressure Sensor harness connector to the PCM C2 harness connector.


Is the resistance below 5.0 Ohms?

Yes


No


5. (G6) ENGINE OIL PRESSURE SIGNAL CIRCUIT SHORTED TO GROUND
1. Measure the resistance between ground and the (G6) Engine Oil Pressure Signal circuit in the Engine Oil Pressure Sensor harness connector.


Is the resistance below 100 Ohms?

Yes


No


6. EXCESSIVE RESISTANCE IN THE (F855) 5-VOLT SUPPLY CIRCUIT
1. Measure the resistance of the (F855) 5-Volt Supply circuit from the Engine Oil Pressure Sensor harness connector to the PCM C2 harness connector.


Is the resistance below 5.0 Ohms?

Yes


No


7. (F855) 5-VOLT SUPPLY SHORTED TO GROUND
1. Measure the resistance between ground and the (F855) 5-Volt Supply circuit in the Engine Oil Pressure Sensor harness connector.


Is the resistance below 100 Ohms?

Yes


No


8. EXCESSIVE RESISTANCE IN THE (K900) SENSOR GROUND CIRCUIT
1. Measure the resistance of the (K900) Sensor Ground circuit from the Engine Oil Pressure Sensor harness connector to the PCM C2 harness connector.


Is the resistance below 5.0 Ohms?

Yes


No


9. POWERTRAIN CONTROL MODULE (PCM)

1. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Engine Oil Pressure Sensor and the Powertrain Control Module (PCM).
2. Look for any chafed, pierced, pinched, or partially broken wires.
3. 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.
4. Perform any Technical Service Bulletins that may apply.


Were there any problems found?

Yes


No