A/C PRESSURE SENSOR HIGH (BCM)

For a complete wiring diagram Refer to Section 8W.

When Monitored:
With the ignition on.
Set Condition:
The Body Control Module (BCM) will set this DTC if voltage goes above 4.92 volts for more than 5 seconds on the (C18) A/C Pressure Sensor Signal circuit.

Possible Causes

(C18) A/C PRESSURE SIGNAL CIRCUIT SHORTED TO VOLTAGE

(C18) A/C PRESSURE SIGNAL CIRCUIT SHORTED TO THE (K301) 5-VOLT SUPPLY CIRCUIT

(C18) A/C PRESSURE SIGNAL CIRCUIT OPEN

(K310) SENSOR GROUND CIRCUIT OPEN

A/C PRESSURE TRANSDUCER

BCM

1.CHECK THE A/C PRESSURE TRANSDUCER VOLTAGE

NOTE: Verify that the A/C Refrigerant System is properly charged before proceeding.

Is the voltage above 4.6 volts?

Yes

2.CHECK THE (C18) A/C PRESSURE SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE

Is the voltage above 5.2 volts?

Yes

Repair the (C18) A/C Pressure Signal circuit for a short to voltage.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).

3.CHECK THE (C18) A/C PRESSURE SIGNAL CIRCUIT FOR A SHORT TO THE (K301) 5-VOLT SUPPLY CIRCUIT

Is the resistance below 10k ohms?

Yes

Repair the (C18) A/C Pressure Signal circuit for a short to the (K301) 5-Volt Supply circuit.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).

4.CHECK THE (C18) A/C PRESSURE SIGNAL CIRCUIT & THE (K310) SENSOR GROUND CIRCUIT FUNCTION

Is the voltage below 1.0 volt?

Yes

Replace the A/C Pressure Transducer in accordance with the Service Information.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).

5.CHECK THE (C18) A/C PRESSURE SIGNAL CIRCUIT FOR AN OPEN

Is the resistance below 5.0 ohms?

Yes

Repair the (C18) A/C Pressure Signal circuit for an open.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).

6.CHECK THE (K310) SENSOR GROUND CIRCUIT FOR AN OPEN

Is the resistance below 5.0 ohms?

Yes

Replace and program the BCM in accordance with the Service Information.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).

Repair the (K310) Sensor Ground circuit for an open.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).

7.TEST FOR INTERMITTENT CONDITION

NOTE: The condition that set this DTC is not present at this time. The following may help in identifying the cause of the intermittent condition.

Were any problems found?

Yes