Chrysler Town, Dodge Caravan. Manual — part 648
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 0.6 of a volt?
All
Yes
→ Replace the A/C Pressure Sensor.
Perform POWERTRAIN VERIFICATION TEST VER - 2 - NGC.
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 between ground and the (C18) A/C Pressure Signal circuit in
the A/C Pressure Sensor harness connector.
Is the resistance below 100 ohms?
All
Yes
→ Repair the short to ground in the (C18) A/C Pressure Signal
circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 2 - NGC.
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 (C18) A/C Pressure Sensor Signal circuit and the
(K4) Sensor ground circuit in the A/C Pressure Sensor harness connector.
Is the resistance below 100 ohms?
All
Yes
→ Repair the short to the (K4) Sensor ground circuit in the (C18) A/C
Pressure Signal circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 2 - NGC.
No
→ Go To 6
6
NOTE: Before continuing, check the PCM harness connector terminals for
corrosion, damage, or terminal push out. Repair as necessary.
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 - NGC.
7
Turn the ignition off.
Disconnect the A/C Pressure Sensor harness connector.
Disconnect the PCM harness connector.
Measure the resistance between ground and the (K7) 5 Volt Supply circuit in the A/C
Pressure Sensor harness connector.
Is the resistance below 100 ohms?
All
Yes
→ Repair the short to ground in the (K7) 5 Volt Supply circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 2 - NGC.
No
→ Go To 8
400
DRIVEABILITY - NGC
P0532-A/C PRESSURE SENSOR LOW —
Continued
TEST
ACTION
APPLICABILITY
8
Turn the ignition off.
Disconnect the A/C Pressure Sensor harness connector.
Disconnect the PCM harness connector.
CAUTION: DO NOT PROBE THE PCM HARNESS CONNECTORS. PROBING
THE PCM HARNESS CONNECTORS WILL DAMAGE THE PCM TERMI-
NALS RESULTING IN POOR TERMINAL TO PIN CONNECTION. INSTALL
MILLER SPECIAL TOOL #8815 TO PERFORM DIAGNOSIS.
Measure the resistance of the (K7) 5 Volt Supply circuit from the A/C Pressure Sensor
harness connector to the appropriate terminal of special tool #8815.
Is the resistance below 5.0 ohms?
All
Yes
→ Go To 9
No
→ Repair the open in the (K7) 5 Volt Supply circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 2 - NGC.
9
NOTE: Before continuing, check the PCM harness connector terminals for
corrosion, damage, or terminal push out. Repair as necessary.
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 - NGC.
401
DRIVEABILITY - NGC
P0532-A/C PRESSURE SENSOR LOW —
Continued
Symptom:
P0533-A/C PRESSURE SENSOR HIGH
When Monitored and Set Condition:
P0533-A/C PRESSURE SENSOR HIGH
When Monitored:
The engine running. The A/C relay energized.
Set Condition:
The A/C pressure sensor signal at the PCM goes above 4.92 volts. One trip
Fault.
POSSIBLE CAUSES
A/C PRESSURE SENSOR VOLTAGE ABOVE 4.6 VOLTS
(C18) A/C PRESSURE SIGNAL CIRCUIT SHORTED TO (K7) 5 VOLT SUPPLY CIRCUIT
(C18) A/C PRESSURE SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE
A/C PRESSURE SENSOR INTERNAL FAILURE
(C18) A/C PRESSURE SIGNAL CIRCUIT OPEN
(K4) SENSOR GROUND CIRCUIT OPEN
PCM
TEST
ACTION
APPLICABILITY
1
NOTE: Ensure the A/C refrigerant System is properly charged per the
Service Information.
Start the engine.
With the DRBIII
t, read the A/C Pressure Sensor voltage.
Is the voltage above 4.6 volts?
All
Yes
→ Go To 2
No
→ Refer to the INTERMITTENT CONDITION symptom in the
Driveability category.
Perform POWERTRAIN VERIFICATION TEST VER - 2 - NGC.
2
Turn the ignition off.
Disconnect the A/C Pressure Sensor harness connector.
Disconnect the PCM harness connector.
Measure the resistance between the (C18) A/C Pressure Signal circuit and the (K7)
5 Volt Supply circuit in the A/C Pressure Sensor harness connector.
Is the resistance below 5.0 ohms?
All
Yes
→ Repair the (C18) A/C Pressure Signal circuit for a short to the (K7)
5 Volt Supply circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 2 - NGC.
No
→ Go To 3
402
DRIVEABILITY - NGC
TEST
ACTION
APPLICABILITY
3
Turn the ignition off.
Disconnect the A/C Pressure Sensor harness connector.
Turn the ignition on.
Measure the voltage on the (C18) A/C Pressure Sensor Signal circuit at the A/C
Pressure Sensor harness connector.
Is the voltage above 5.2 volts?
All
Yes
→ Repair the (C18) A/C Pressure Signal circuit for a short to battery
voltage.
Perform POWERTRAIN VERIFICATION TEST VER - 2 - NGC.
No
→ Go To 4
4
Turn the ignition off.
Disconnect the A/C Pressure Sensor harness connector.
Connect a jumper wire between the (C18) A/C Pressure Signal circuit and the (K4)
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 POWERTRAIN VERIFICATION TEST VER - 2 - NGC.
No
→ Go To 5
5
Turn the ignition off.
Disconnect the A/C Pressure Sensor harness connector.
Disconnect the PCM harness connector.
CAUTION: DO NOT PROBE THE PCM HARNESS CONNECTORS. PROBING
THE PCM HARNESS CONNECTORS WILL DAMAGE THE PCM TERMI-
NALS RESULTING IN POOR TERMINAL TO PIN CONNECTION. INSTALL
MILLER SPECIAL TOOL #8815 TO PERFORM DIAGNOSIS.
Measure the resistance of the (C18) A/C Pressure Sensor Signal circuit from the A/C
Pressure Sensor harness connector to the appropriate terminal of special tool #8815.
Is the resistance below 5.0 ohms?
All
Yes
→ Go To 6
No
→ Repair the (C18) A/C Pressure Signal circuit for an open.
Perform POWERTRAIN VERIFICATION TEST VER - 2 - NGC.
6
Turn the ignition off.
Disconnect the A/C Pressure Sensor harness connector.
Disconnect the PCM harness connector.
CAUTION: DO NOT PROBE THE PCM HARNESS CONNECTORS. PROBING
THE PCM HARNESS CONNECTORS WILL DAMAGE THE PCM TERMI-
NALS RESULTING IN POOR TERMINAL TO PIN CONNECTION. INSTALL
MILLER SPECIAL TOOL #8815 TO PERFORM DIAGNOSIS.
Measure the resistance of the (K4) Sensor ground circuit from the A/C Pressure
Sensor harness connector to the appropriate terminal of special tool #8815.
Is the resistance below 5.0 ohms?
All
Yes
→ Go To 7
No
→ Repair the (K4) Sensor ground circuit for an open.
Perform POWERTRAIN VERIFICATION TEST VER - 2 - NGC.
403
DRIVEABILITY - NGC
P0533-A/C PRESSURE SENSOR HIGH —
Continued
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