Diagnostic Test

WARNING: This page is about a different car, the 2015 RAM 1500. However, it is still accessible from the selected car via links, so may be relevant.

ACTIVE DTC
NOTE:
If any 5-Volt supply DTCs are present, repair those DTCs before proceeding with this test.
1. Turn the ignition on.
2. With the scan tool, record all Freeze frame data.
3. With the scan tool, erase DTCs.
4. Turn the ignition off for 75 seconds.
5. Turn the ignition on.
6. With the scan tool, read DTCs.
  Did the DTC reset?
  
  Yes
  - Go To 2
  No
  - Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to INTERMITTENT DTC .
CHECK THE (C918) SENSOR RETURN CIRCUIT FOR AN OPEN/HIGH RESISTANCE
1. Turn the ignition off.
2. Disconnect the PCM C1 harness connector.
3. Disconnect the A/C Pressure Sensor harness connector.
4. Measure the resistance of the (C918) Sensor Return circuit between the A/C Pressure Sensor harness connector and the PCM C1 harness connector.
  Is the resistance above 5.0 Ohms?
  
  Yes
  - Repair the (C918) Sensor Return circuit for an open or high resistance.
  - Perform the PCM VERIFICATION TEST. Refer to PCM VERIFICATION TEST .
  No
  - Go To 3
CHECK THE (C18) SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE
1. Reconnect the PCM C1 harness connector.
2. Turn the ignition on.
3. 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?
  
  Yes
  - Repair the (C18) A/C Pressure Sensor Signal circuit for a short to voltage.
  - Perform the PCM VERIFICATION TEST. Refer to PCM VERIFICATION TEST .
  No
  - Go To 4
A/C PRESSURE SENSOR
1. Turn the ignition off.
2. Reconnect the A/C Pressure Sensor harness connector.
3. Turn the ignition on.
4. With the scan tool, record all Freeze frame data.
5. With the scan tool, erase DTCs.
6. Turn the ignition off for 75 seconds.
7. Disconnect the A/C Pressure Sensor harness connector.
8. Turn the ignition on.
9. While monitoring scan tool, use a jumper wire to connect the (C918) Sensor Return circuit to the (C18) A/C Pressure Sensor Signal circuit at the A/C Pressure Sensor harness connector.
  Did P0532 set?
  
  Yes
  - Replace the A/C Pressure Sensor.
  - Perform the PCM VERIFICATION TEST. Refer to PCM VERIFICATION TEST .
  No
  - Replace the Powertrain Control Module in accordance with the service information.
  - Perform the PCM VERIFICATION TEST. Refer to PCM VERIFICATION TEST .