Jeep Grand Cherokee WK. Manual — part 998
P0523-ENGINE OIL PRESSURE SENSOR CIRCUIT HIGH (CONTINUED)
6.
(K900) SENSOR GROUND CIRCUIT OPEN
Measure the resistance of the (K900) Sensor Ground circuit from the
Engine Oil Pressure Sensor harness connector to the appropriate ter-
minal of special tool #8815.
Is the resistance below 5.0 ohms?
Yes
>> Go To 7
No
>> Repair the open in the (K900) Sensor Ground circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)
7.
PCM
NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal
push out. Repair as necessary.
Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and
Ground circuits.
Were there any problems found?
Yes
>> Repair as necessary.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Replace and program the Powertrain Control Module per Service Information.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
9 - 588
ENGINE ELECTRICAL DIAGNOSTICS
WK
P0524-ENGINE OIL PRESSURE TOO LOW
WK
ENGINE ELECTRICAL DIAGNOSTICS
9 - 589
P0524-ENGINE OIL PRESSURE TOO LOW (CONTINUED)
For the Engine System Schematic circuit diagram (Refer to 9 - ENGINE - SCHEMATICS AND DIAGRAMS).
For a complete wiring diagram Refer to Section 8W.
•
When Monitored:
Engine running.
•
Set Condition:
The engine oil pressure never reaches the calibrated specification to allow the MDS activation.
Possible Causes
ENGINE OIL/ENGINE MECHANICAL
(G6) ENGINE OIL PRESSURE SENSOR SIGNAL CIRCUIT SHORTED TO BATTERY 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 RETURN CIRCUIT
ENGINE OIL PRESSURE SENSOR
PCM
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING).
Diagnostic Test
1.
ACTIVE DTC
NOTE: Make sure that the engine oil is at the proper level. Also, check the customers oil change history to
make sure that the oil is being changed at the correct intervals and that the proper oil viscosity is being
used.
Ignition on, engine not running.
With a scan tool, read DTCs.
Is the DTC active at this time?
Yes
>> Go To 2
No
>> Refer to the INTERMITTENT CONDITION Diagnostic Procedure.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
9 - 590
ENGINE ELECTRICAL DIAGNOSTICS
WK
P0524-ENGINE OIL PRESSURE TOO LOW (CONTINUED)
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.
•
ENGINE MECHANICAL TOLERANCES OUT OF SPECIFICATION
•
ENGINE OIL PRESSURE OUT OF SPECIFICATION
•
LOW ENGINE OIL
•
OIL DIRTY OR DETERIORATED (Lack of scheduled oil changes)
•
CORRECT VISCOSITY
•
ENGINE OIL CONTAMINATED (i.e., coolant and/or fuel)
If any of the above conditions are found, repair as necessary.
Were any of the above conditions present?
Yes
>> Repair as necessary.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 3
3.
ENGINE OIL PRESSURE SENSOR
Turn the ignition off.
Connect the C2 PCM harness connector.
Ignition on, engine not running.
With a scan tool, monitor the Engine Oil Pressure Sensor voltage.
Connect a jumper wire between the (K900) Sensor Ground circuit and
the (G6) Engine Oil Pressure Signal circuit.
NOTE: Engine Oil Pressure voltage should change from approxi-
mately 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
>> Remove the Engine Oil Pressure sensor and ensure the
oil passage/port is free from any blockage. If OK, replace
the Engine Oil Pressure Sensor.
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 4
NOTE: Remove the jumper wire before continuing.
WK
ENGINE ELECTRICAL DIAGNOSTICS
9 - 591
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