Jeep XJ. Manual — part 636
Symptom:
*CHECKING THE OIL PRESSURE GAUGE OPERATION
POSSIBLE CAUSES
CHECK FOR OTHER DTCS
POWERTRAIN CONTROL MODULE
POWERTRAIN CONTROL MODULE - SENSOR GROUND SHORTED TO VOLTAGE
INSTRUMENT CLUSTER
CHECK ENGINE OIL PRESSURE WITH EXTERNAL GAUGE
5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND
5-VOLT SUPPLY CIRCUIT SHORTED TO SENSOR GROUND
5-VOLT SUPPLY CIRCUIT OPEN
ENGINE OIL PRESSURE SENSOR
POWERTRAIN CONTROL MODULE - 5-VOLT SUPPLY CIRCUIT LOW
SENSOR GROUND CIRCUIT SHORTED TO VOLTAGE
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRB, check for Oil Pressure Sensor related DTCs.
Are any Oil Pressure Sensor DTCs present?
All
Yes
→
Refer to symptom list for problems related to Oil Pressure Sensor
DTCs.
Perform ROAD TEST VERIFICATION - VER-2.
No
→
2
CAUTION: Ensure the engine oil is at the proper level before proceeding.
Start the engine.
With the DRB in Sensors, read the Oil Pressure Sensor voltage.
Is the voltage between 1.0 and 4.0 volts?
All
Yes
→
No
→
3
Turn the ignition off, wait 30 seconds, then turn the ignition on.
With the DRB, select BODY from the SYSTEM menu, then select ELECTRO/MECH
CLUSTER (MIC), ACTUATOR TESTS and SELF TEST.
Perform the Instrument Cluster Self Test.
Observe the Oil Pressure Gauge.
NOTE: The Oil Pressure Gauge should stop at 0 Bar (0 PSI), 3.0 Bar (40 PSI),
5.0 Bar (80 PSI) and 8.3 Bar (120 PSI).
Did the gauge reach the proper calibration points?
All
Yes
→
Replace and program the Powertrain Control Module in accor-
dance with the Service Information.
Perform ROAD TEST VERIFICATION - VER-2.
No
→
Replace the Instrument Cluster in accordance with the Service
Information.
Perform ROAD TEST VERIFICATION - VER-2.
196
DRIVEABILITY - DIESEL
TEST
ACTION
APPLICABILITY
4
Turn the ignition off.
Connect a 8.3 Bar (120 PSI) oil pressure gauge to the engine.
Start the engine.
Observe the mechanical oil pressure gauge.
Is the engine oiling system functioning properly?
All
Yes
→
No
→
Repair the engine oiling system in accordance with the Service
Information.
Perform ROAD TEST VERIFICATION - VER-2.
5
Turn the ignition off.
Disconnect the Engine Oil Pressure Sensor harness connector.
Turn the ignition on.
Measure the voltage of the 5-volt Supply circuit in the Engine Oil Pressure Sensor
harness connector.
Is the voltage between 4.8 and 5.5 volts?
All
Yes
→
No
→
6
Turn the ignition off.
Disconnect the Engine Oil Pressure Sensor harness connector.
Measure the voltage on the Sensor Ground circuit.
Is the voltage below 0.5 volt?
All
Yes
→
Replace the Engine Oil Pressure Sensor.
Perform ROAD TEST VERIFICATION - VER-2.
No
→
7
Turn the ignition off.
Disconnect the Engine Oil Pressure Sensor harness connector.
Disconnect the PCM harness connectors.
Turn the ignition on.
Measure the voltage of the Sensor Ground circuit.
Is the voltage below 0.5 volt?
All
Yes
→
Replace and program the Powertrain Control Module in accor-
dance with the Service Information.
Perform ROAD TEST VERIFICATION - VER-2.
No
→
Repair the Sensor Ground circuit for a short to voltage.
Perform ROAD TEST VERIFICATION - VER-2.
8
Turn the ignition off.
Disconnect the Engine Oil Pressure Sensor harness connector.
Disconnect the PCM harness connectors.
Measure the resistance between ground and the 5-volt Supply circuit.
Is the resistance above 100 kohms?
All
Yes
→
No
→
Repair the 5-volt Supply circuit for a short to ground.
Perform ROAD TEST VERIFICATION - VER-2.
197
DRIVEABILITY - DIESEL
*CHECKING THE OIL PRESSURE GAUGE OPERATION —
Continued
TEST
ACTION
APPLICABILITY
9
Turn the ignition off.
Disconnect the Engine Oil Pressure Sensor harness connector.
Disconnect the PCM harness connectors.
Measure the resistance between the 5-volt Supply circuit and the Sensor Ground
circuit in the Engine Oil Pressure Sensor harness connector.
Is the resistance above 100 kohms?
All
Yes
→
No
→
Repair the 5-volt Supply circuit for a short to the Sensor Ground
circuit.
Perform ROAD TEST VERIFICATION - VER-2.
10
Turn the ignition off.
Disconnect the Engine Oil Pressure Sensor harness connector.
Disconnect the PCM harness connectors.
Measure the resistance of the 5-volt Supply circuit between the Engine Oil Pressure
Sensor harness connector and the PCM C1 harness connector.
Is the resistance below 5.0 ohms?
All
Yes
→
No
→
Repair the 5-volt Supply circuit for an open.
Perform ROAD TEST VERIFICATION - VER-2.
11
If there are no possible causes remaining, view repair.
All
Repair
Replace and program the Powertrain Control Module in accor-
dance with the Service Information.
Perform ROAD TEST VERIFICATION - VER-2.
198
DRIVEABILITY - DIESEL
*CHECKING THE OIL PRESSURE GAUGE OPERATION —
Continued
Symptom:
*CHECKING THE SPEEDOMETER OPERATION
POSSIBLE CAUSES
CHECK FOR VEHICLE SPEED SENSOR DTCS
CHECK GAUGES AND OTHER LAMPS AT KEY ON
COMPARETHE DRB VEHICLE SPEED WITH THE SPEEDOMETER
INSTRUMENT CLUSTER
POWERTRAIN CONTROL MODULE - 5-VOLT OPEN
POWERTRAIN CONTROL MODULE - INTERNAL FAULT
5-VOLT SUPPLY CIRCUIT OPEN
CHECK VSS CIRCUITS FOR A SHORT TO VOLTAGE
CHECK VSS CIRCUITS FOR A SHORT TO GROUND
CHECK VSS CIRCUITS FOR A SHORT TOGETHER
CHECK VSS CIRCUITS FOR AN OPEN
VEHICLE SPEED SENSOR
TEST
ACTION
APPLICABILITY
1
Turn the ignition on and observe gauge and lamp operation during bulb check.
Did the gauges and other lamps operate properly during the bulb check?
All
Yes
→
No
→
Refer to symptom list for problems related to Vehicle Communi-
cation.
Perform ROAD TEST VERIFICATION - VER-2.
2
Turn the ignition on.
With the DRB, read ECM DTCs.
Are any Vehicle Speed Sensor DTCs present?
All
Yes
→
Refer to symptom list for problems related to Vehicle Speed
Sensor DTCs before continuing.
Perform ROAD TEST VERIFICATION - VER-2.
No
→
3
With the DRB, monitor Vehicle Speed in the PCM Sensor Display menu.
Test drive the vehicle and observe the Vehicle Speed on the DRB.
Does the Vehicle Speed reading on the DRB increase with vehicle speed?
All
Yes
→
No
→
199
DRIVEABILITY - DIESEL
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