A/C PRESSURE SENSOR LOW (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 drops below 0.137 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 GROUND

(C18) A/C PRESSURE SIGNAL CIRCUIT SHORTED TO THE (K310) SENSOR GROUND CIRCUIT

(K301) 5-VOLT SUPPLY CIRCUIT OPEN

(K301) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND

(K301) 5-VOLT SUPPLY CIRCUIT SHORTED TO THE (K310) SENSOR GROUND CIRCUIT

A/C PRESSURE TRANSDUCER

BCM

Diagnostic Test

1.CHECK THE A/C PRESSURE TRANSDUCER VOLTAGE

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

Is the voltage below 0.5 volts?

Yes

Go To 2

Go To 9

2.CHECK THE (K301) 5-VOLT SUPPLY CIRCUIT VOLTAGE

Is the voltage above 4.5 volts?

Yes

Go To 3

Go To 6

3.CHECK THE A/C PRESSURE TRANSDUCER VOLTAGE WITH THE TRANSDUCER DISCONNECTED

Is the voltage above 0.5 of a 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).

Go To 4

4.CHECK THE (C18) A/C PRESSURE SIGNAL CIRCUIT FOR A SHORT TO GROUND

Is the resistance below 10k ohms?

Yes

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

Go To 5

5.CHECK THE (C18) A/C PRESSURE SIGNAL CIRCUIT FOR A SHORT TO THE (K310) SENSOR GROUND CIRCUIT

Is the resistance below 10k ohms?

Yes

Repair the (C18) A/C Pressure Signal circuit for a short to the (K310) Sensor Ground circuit.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).

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).

6.CHECK THE (K301) 5-VOLT SUPPLY CIRCUIT FOR AN OPEN

Is the resistance below 5.0 ohms?

Yes

Go To 7

Repair the (K301) 5-Volt Supply circuit for an open.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).

7.CHECK THE (K301) 5-VOLT SUPPLY CIRCUIT FOR A SHORT TO GROUND

Is the resistance below 10k ohms?

Yes

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

Go To 8

8.CHECK THE (K301) 5-VOLT SUPPLY CIRCUIT FOR A SHORT TO FOR A SHORT TO THE (K310) SENSOR GROUND CIRCUIT

Is the resistance below 10k ohms?

Yes

Repair the (K301) 5-Volt Supply circuit for a short to the (K310) Sensor Ground circuit.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).

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).

9.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

Repair as necessary.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).

Test Complete.