TEST
ACTION
APPLICABILITY
3
Turn the ignition off.
Disconnect the A/C Pressure Sensor harness connector.
Turn the ignition on.
Measure the voltage of the A/C Pressure Sensor Signal circuit in the A/C Pressure
Sensor harness connector.
Is the voltage above 5.5 volts?
All
Yes
→
Repair the A/C Pressure Sensor Signal circuit for a short to
voltage.
Perform ROAD TEST VERIFICATION - VER - 2.
No
→
Go To
4
4
Turn the ignition off.
Disconnect the A/C Pressure Sensor harness connector.
Connect a jumper wire between the A/C Pressure Sensor Signal circuit and the
Sensor Ground circuit.
With the DRBIII
t, monitor the A/C Pressure Sensor voltage.
Turn the ignition on.
Is the voltage below 1.0 volt?
All
Yes
→
Replace the A/C Pressure Sensor.
Perform ROAD TEST VERIFICATION - 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 of the A/C Pressure Sensor Signal circuit between the A/C
Pressure Sensor harness connector and the PCM harness connector.
Is the resistance below 5 ohms?
All
Yes
→
Go To
6
No
→
Repair the A/C Pressure Sensor Signal circuit for an open.
Perform ROAD TEST VERIFICATION - VER - 2.
6
Turn the ignition off.
Disconnect the A/C Pressure Sensor harness connector.
Measure the resistance between ground and the Sensor Ground circuit.
Is the resistance below 30 ohms?
All
Yes
→
Go To
7
No
→
Repair the Sensor Ground circuit for an open.
Perform ROAD TEST VERIFICATION - VER - 2.
7
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.
203
HEATING & A/C
P1598-A/C PRESSURE SENSOR SIGNAL HIGH —
Continued