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Symptom:
P0641-SENSOR REFERENCE VOLTAGE A CKT VOLTAGE TOO
HIGH
When Monitored and Set Condition:
P0641-SENSOR REFERENCE VOLTAGE A CKT VOLTAGE TOO HIGH
When Monitored: With the ignition on.
Set Condition: The ECM detects a short to voltage on the Sensor Reference Voltage A
circuit or the Fuel Pressure Sensor 5-Volt Supply circuit.
INTERMITTENT CONDITION
SENSOR REFERENCE VOLTAGE A SHORTED TO VOLTAGE
ENGINE CONTROL MODULE
FUEL PRESSURE SENSOR 5 VOLT SUPPLY CIRCUIT SHORTED TO VOLTAGE
TEST
1
Turn the ignition on.
With the DRB, erase ECM DTCs.
Monitor the DRB for ECM DTCs.
Did this DTC set again?
Yes → Go To 2
→ Go To 5
No
2
Turn the ignition off.
Disconnect the MAF and APP Sensor harness connectors.
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 A circuit.
Is the voltage above 1.0 volt?
Yes → Repair the Sensor Reference Voltage A circuit for a short to
→ Go To 3
No
NOTE: Remove the jumper wire and reinstall the ASD Relay.
POSSIBLE CAUSES
ACTION
voltage.
Perform ROAD TEST VERIFICATION - VER-2.
DRIVEABILITY - DIESEL
135
APPLICABILITY
All
All
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