DaimlerChrysler Jeep Grand Cherokee 2002, Service Manual

Page: 152 / 284

Symptom:
P0651-SENSOR REFERENCE VOLTAGE B CKT VOLTAGE TOO
HIGH
When Monitored and Set Condition:
P0651-SENSOR REFERENCE VOLTAGE B CKT VOLTAGE TOO HIGH
When Monitored: With the ignition on.
Set Condition: The ECM detects a short to voltage on the Sensor Reference Voltage B
circuit or the Accelerator Pedal Position Sensor 5-Volt Supply circuit.
POSSIBLE CAUSES
INTERMITTENT CONDITION
SENSOR REFERENCE VOLTAGE B CIRCUIT SHORTED TO VOLTAGE
ACCELERATOR PEDAL POSITION SENSOR 5 VOLT SUPPLY CIRCUIT SHORTED TO VOLTAGE
ENGINE CONTROL MODULE
TEST ACTION APPLICABILITY
1 Turn the ignition on.
With the DRB, erase ECM DTCs.
Monitor the DRB for ECM DTCs.
Did this DTC set again? All
Yes
→
Go To 2
No
→
Go To 5
2 Turn the ignition off.
Disconnect the Boost Pressure Sensor harness connector.
Disconnect the Engine Oil Pressure Sensor harness connector.
Disconnect the A/C Pressure Sensor harness connector.
Disconnect the ECM harness connectors.
Remove the ASD Relay from the PDC.
Connect a jumper wire between cavity 30 and cavity 87 of the ASD Relay connector.
Turn the ignition on.
Measure the voltage on the Sensor Reference Voltage B circuit.
Is the voltage above 1.0 volt? All
Yes
→
Repair the Sensor Reference Voltage B circuit for a short to
voltage.
Perform ROAD TEST VERIFICATION - VER-2.
No
→
Go To 3
NOTE: Remove the jumper wire and reinstall the ASD Relay.
144
DRIVEABILITY - DIESEL
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