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P0532-A/C PRESSURE SENSOR CIRCUIT LOW (CONTINUED) For the Engine circuit diagram (Refer to 9 - ENGINE - SCHEMATICS AND DIAGRAMS). For a complete wiring diagram Refer to Section 8W. • When Monitored: • Set Condition: Possible Causes (F891) 5-VOLT SUPPLY CIRCUIT OPEN (F891) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND A/C PRESSURE TRANSDUCER (C18) A/C PRESSURE SIGNAL CIRCUIT SHORTED TO GROUND (C18) A/C PRESSURE SIGNAL CIRCUIT SHORTED TO THE (C918) SENSOR RETURN CIRCUIT FRONT CONTROL MODULE Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE - Diagnostic Test 1. A/C PRESSURE TRANSDUCER VOLTAGE BELOW 0.6 OF A VOLT NOTE: Make sure the A/C refrigerant System is properly charged per Service Information. With a scan tool, read the A/C Pressure Sensor voltage. Is the voltage below 0.6 of a volt? Yes >> Go To 2 No >> Refer to the INTERMITTENT CONDITION Diagnostic Procedure. Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE) 2. (F891) 5-VOLT SUPPLY CIRCUIT Turn the ignition off. Disconnect the A/C Pressure Transducer harness connector. Ignition on, engine not running. Measure the voltage on the (F891) 5-volt Supply circuit in the A/C Is the voltage between 4.5 to 5.2 volts? Yes >> Go To 3 No >> Go To 6 9 - 596 ENGINE ELECTRICAL DIAGNOSTICS WK |