TEST
ACTION
APPLICABILITY
3
Turn the ignition off.
Disconnect the A/C Pressure Sensor harness connector.
With the DRBIII
t, monitor the A/C Pressure Sensor voltage.
Turn the ignition on.
Is the voltage above .07 volts?
All
Yes
→
Replace the A/C Pressure Sensor.
Perform POWERTRAIN VERIFICATION TEST VER - 2.
No
→
Go To
4
4
Turn the ignition off.
Disconnect the A/C Pressure Sensor harness connector.
Disconnect the PCM harness connector.
Measure the resistance of the A/C Pressure Sensor Signal circuit in the A/C Pressure
Sensor harness connector to ground.
Is the resistance below 100 ohms?
All
Yes
→
Repair the A/C Pressure Sensor Signal circuit for a short to
ground.
Perform POWERTRAIN VERIFICATION TEST VER - 2.
No
→
Go To
5
5
Turn the ignition off.
Disconnect the A/C Pressure Sensor harness connector.
Disconnect the PCM harness connector.
Measure the resistance between the A/C Pressure Sensor Signal circuit and the
Sensor ground circuit in the A/C Pressure Sensor harness connector.
Is the resistance below 100 ohms?
All
Yes
→
Repair the A/C Pressure Sensor Signal circuit for a short to the
Sensor ground circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 2.
No
→
Go To
6
6
If there are no possible causes remaining, view repair.
All
Repair
Replace and program the Powertrain Control Module in accor-
dance with the Service Information.
Perform POWERTRAIN VERIFICATION TEST VER - 2.
7
Turn the ignition off.
Disconnect the A/C Pressure Sensor harness connector.
Disconnect the PCM harness connector.
Measure the resistance of the 5 Volt Supply circuit in the A/C Pressure Sensor
harness connector to ground.
Is the resistance below 100 ohms?
All
Yes
→
Repair the 5 Volt Supply circuit for a short to ground.
Perform POWERTRAIN VERIFICATION TEST VER - 2.
No
→
Go To
8
208
HEATING & A/C
P1599-A/C PRESSURE SENSOR VOLTS TOO LOW —
Continued