Jeep Grand Cherokee WK. Manual — part 994
P0521-ENGINE OIL PRESSURE SENSOR PERFORMANCE (CONTINUED)
8.
(F855) 5-VOLT SUPPLY SHORTED TO GROUND
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
>> Repair the short to ground in the (F855) 5-volt Supply cir-
cuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 9
9.
EXCESSIVE RESISTANCE IN THE (K900) SENSOR GROUND CIRCUIT
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 10
No
>> Repair the excessive resistance in the (K900) Sensor
Ground circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)
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ENGINE ELECTRICAL DIAGNOSTICS
WK
P0521-ENGINE OIL PRESSURE SENSOR PERFORMANCE (CONTINUED)
10.
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)
WK
ENGINE ELECTRICAL DIAGNOSTICS
9 - 573
P0522-ENGINE OIL PRESSURE SENSOR CIRCUIT LOW 5.7L
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ENGINE ELECTRICAL DIAGNOSTICS
WK
P0522-ENGINE OIL PRESSURE SENSOR CIRCUIT LOW 5.7L (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:
With the ignition on. Battery voltage greater than 10 volts.
•
Set Condition:
The Oil pressure signal is below the calibrated amount. One Trip Fault. Three good trips to turn off the MIL.
ETC light will illuminate.
Possible Causes
(F855) 5-VOLT SUPPLY CIRCUIT OPEN
(F855) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND
(G6) ENGINE OIL PRESSURE SIGNAL CIRCUIT SHORTED TO GROUND
(G6) ENGINE OIL PRESSURE SIGNAL CIRCUIT SHORTED TO THE (K900) SENSOR GROUND 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
ensure 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)
2.
(F855) 5-VOLT SUPPLY CIRCUIT
Turn the ignition off.
Disconnect the Engine Oil Pressure Sensor harness connector.
Ignition on, engine not running.
Measure the voltage on the (F855) 5-volt Supply circuit in the Engine
Oil Pressure Sensor harness connector.
Is the voltage between 4.8 to 5.2 volts?
Yes
>> Go To 3
No
>> Go To 6
WK
ENGINE ELECTRICAL DIAGNOSTICS
9 - 575
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