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P0530-A/C PRESSURE SENSOR CIRCUIT SIGNAL VOLTAGE TOO HIGH
—
Continued
ECM - A/C PRESSURE SENSOR SIGNAL
ECM - SENSOR REFERENCE VOLTAGE B CIRCUIT
ECM - SIGNAL VOLTAGE HIGH
TEST
1
NOTE: If DTC P0641 or P0651 is present with this DTC, diagnose DTCs
P0641 and P0651 before diagnosing this DTC.
NOTE: Ensure the A/C refrigerant System is properly charged per the
Service Information.
Start the engine.
With the DRBIII , read the A/C Pressure Sensor voltage.
Select the choice that best reflects the DRBIII reading.
Above 4.6 volts
Between 0.7 and 4.6 volts
Below 0.7 volt
2
Turn the ignition off.
Disconnect the A/C Pressure Sensor harness connector.
Disconnect the ECM harness connector.
Measure the resistance between the A/C Pressure Sensor Signal circuit and the 5-volt
Supply circuit in the A/C Pressure Sensor harness connector.
Is the resistance above 100 kohms?
Yes → Go To 3
→ Repair the A/C Pressure Sensor Signal circuit for a short to the
No
3
Turn the ignition off.
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 of the Sensor Ground circuit at the A/C Pressure Sensor and
ECM harness connectors.
Is the voltage above 1.0 volt at either connector?
Yes → Repair the A/C Pressure Sensor Ground circuit for a short to
→ Go To 4
No
NOTE: If the Sensor Ground circuit had a short to voltage on it, the ECM
may have been damaged. Retest the A/C Pressure Sensor circuit.
POSSIBLE CAUSES
ACTION
Go To 2
Go To 9
Go To 10
5-volt Supply circuit.
Perform ROAD TEST VERIFICATION - VER-2.
voltage.
Perform ROAD TEST VERIFICATION - VER-2.
DRIVEABILITY - DIESEL
113
APPLICABILITY
All
All
All
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