Jeep Grand Cherokee WJ. Manual - part 633

TEST

ACTION

APPLICABILITY

Turn the ignition off.
Disconnect the CAB harness connector.
Disconnect the ECM harness connectors.
Disconnect the PCM harness connectors.
Disconnect the Junction Block C3 harness connector.
Measure the resistance between ground and the Vehicle Speed Signal circuit.
Is the resistance above 100 kohms?

All

Yes

→

Repair the Vehicle Speed Signal circuit between the Junction
Block and the Instrument Cluster for a short to ground.
Perform ROAD TEST VERIFICATION - VER-2.

→

Go To

Turn the ignition off.
Disconnect the Junction Block C2 harness connector.
Disconnect the CAB harness connector.
Disconnect the ECM harness connectors.
Disconnect the PCM harness connectors.
Measure the resistance between ground and the Vehicle Speed Signal circuit in the
CAB harness connector.
Is the resistance above 100 kohms?

All

Yes

→

Replace the Junction Block.
Perform ROAD TEST VERIFICATION - VER-2.

→

Go To

If there are no possible causes remaining, view repair.

All

Repair

Repair the Vehicle Speed Signal circuit for a short to ground.
Perform ROAD TEST VERIFICATION - VER-2.

WARNING: WHEN THE ENGINE IS OPERATING, DO NOT STAND IN A
DIRECT LINE WITH THE FAN. DO NOT PUT YOUR HANDS NEAR THE
PULLEYS, BELTS OR FAN. DO NOT WEAR LOOSE CLOTHING.
NOTE: The conditions that set the DTC are not present at this time. The
following list may help in identifying the intermittent condition.
With the engine running at normal operating temperature, monitor the DRB
parameters related to the DTC while wiggling the wiring harness. Look for param-
eter values to change and/or a DTC to set.
Review the DTC When Monitored and Set Conditions. If possible, try to duplicate the
conditions under which the DTC was set.
Refer to any Technical Service Bulletins (TSB) that may apply.
Visually inspect the related wiring harness. Look for any chafed, pierced, pinched, or
partially broken wires.
Visually inspect the related wiring harness connectors. Look for broken, bent, pushed
out, or corroded terminals.
Were any of the above conditions present?

All

Yes

→

Repair as necessary
Perform ROAD TEST VERIFICATION - VER-2.

→

Test Complete.

DRIVEABILITY - DIESEL

P0500-VEH. SPEED SENSOR PEC FREQUENCY TOO HIGH —

Continued

Symptom:

P0522-OIL PRESSURE VOLTAGE TOO LOW

When Monitored and Set Condition:

P0522-OIL PRESSURE VOLTAGE TOO LOW

When Monitored:

With the ignition on.

Set Condition:

The PCM detects voltage on the oil pressure sensor signal circuit below 0.1

volt.

POSSIBLE CAUSES

CHECKING THE OIL PRESSURE SENSOR

OIL PRESSURE SENSOR SIGNAL CIRCUIT SHORTED TO GROUND

OIL PRESSURE SENSOR SIGNAL CIRCUIT SHORTED TO SENSOR GROUND

PCM - OIL PRESSURE SENSOR SIGNAL SHORT TO GROUND

INTERMITTENT CONDITION

TEST

ACTION

APPLICABILITY

Turn the ignition on.
With the DRB III, erase PCM DTCs.
Cycle the ignition key on and off several times, leaving the key on for at least 10
seconds at a time.
With the DRB III, read PCM DTCs.
Did this DTC reset?

All

Yes

→

Go To

→

Go To

Turn the ignition off.
Disconnect the Oil Pressure Sensor harness connector.
Measure the voltage of the Oil Pressure Sensor Signal circuit.
Is the voltage between 4.7 and 5.3 volts?

All

Yes

→

Replace the Oil Pressure Sensor.
Perform ROAD TEST VERIFICATION - VER-2.

→

Go To

Turn the ignition off.
Disconnect the Oil Pressure Sensor harness connector.
Disconnect the PCM harness connectors.
Measure the resistance between ground and the Oil Pressure Sensor Signal circuit.
Is the resistance above 100 kohms?

All

Yes

→

Go To

→

Repair the Oil Pressure Sensor Signal circuit for a short to
ground.
Perform ROAD TEST VERIFICATION - VER-2.

DRIVEABILITY - DIESEL

TEST

ACTION

APPLICABILITY

Turn the ignition off.
Disconnect the Oil Pressure Sensor harness connector.
Disconnect the PCM harness connectors.
Measure the resistance between Sensor Ground and the Oil Pressure Sensor Signal
circuit.
Is the resistance above 100 kohms?

All

Yes

→

Replace and program the Powertrain Control Module in accor-
dance with the Service Information.
Perform ROAD TEST VERIFICATION - VER-2.

→

Repair the Oil Pressure Sensor Signal circuit for a short to Sensor
Ground.
Perform ROAD TEST VERIFICATION - VER-2.

WARNING: WHEN THE ENGINE IS OPERATING, DO NOT STAND IN A
DIRECT LINE WITH THE FAN. DO NOT PUT YOUR HANDS NEAR THE
PULLEYS, BELTS OR FAN. DO NOT WEAR LOOSE CLOTHING.
NOTE: The conditions that set the DTC are not present at this time. The
following list may help in identifying the intermittent condition.
With the engine running and at normal operating temperature, monitor the DRB
parameters related to the DTC while wiggling the wiring harness. Look for param-
eter values to change and/or a DTC to set.
Review the DTC When Monitored and Set Conditions. If possible, try to duplicate the
conditions under which the DTC was set.
Refer to any Technical Service Bulletins (TSB) that may apply.
Visually inspect the related wiring harness. Look for any chafed, pierced, pinched, or
partially broken wires.
Visually inspect the related wiring harness connectors. Look for broken, bent, pushed
out, or corroded terminals.
Were any of the above conditions present?

All

Yes

→

Repair as necessary
Perform ROAD TEST VERIFICATION - VER-2.

→

Test Complete.

DRIVEABILITY - DIESEL

P0522-OIL PRESSURE VOLTAGE TOO LOW —

Continued

Symptom:

P0523-OIL PRESSURE VOLTAGE TOO HIGH

When Monitored and Set Condition:

P0523-OIL PRESSURE VOLTAGE TOO HIGH

When Monitored:

With the ignition on.

Set Condition:

The PCM detects voltage on the oil pressure sensor signal circuit above 4.8

volts.

POSSIBLE CAUSES

OIL PRESSURE SENSOR FAILURE

OIL PRESSURE SENSOR SIGNAL CIRCUIT OPEN

OIL PRESSURE SENSOR SIGNAL CIRCUIT SHORTED TO VOLTAGE

PCM - OIL PRESSURE SENSOR SIGNAL CIRCUIT SHORTED TO VOLTAGE

PCM - OIL PRESSURE SENSOR SIGNAL OPEN

SENSOR GROUND CIRCUIT OPEN

INTERMITTENT CONDITION

TEST

ACTION

APPLICABILITY

All

Yes

→

Go To

→

Go To

Turn the ignition off.
Disconnect the Oil Pressure Sensor harness connector.
Turn the ignition on.
Measure the voltage of the Oil Pressure Sensor Signal circuit.
Select the appropriate voltage reading.

All

Voltage is above 5.5 volts.

Go To

Voltage is between 4.7 and 5.4 volts.

Go To

Voltage is below 4.7 volts.

Go To

DRIVEABILITY - DIESEL

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