Diagnostic Test

WARNING: This page is about a different car, the 2014 RAM 3500 HD and 2014 RAM 2500 HD. 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 CONDITION - 6.7L .
CHECK THE (C18) A/C PRESSURE SENSOR SIGNAL CIRCUIT FOR A SHORT TO GROUND
1. Turn the ignition off.
2. Disconnect the A/C Pressure Sensor harness connector.
3. Disconnect the PCM C2 harness connector.
  NOTE:
  Check connectors - Clean/repair as necessary.
4. Measure the resistance between ground and the (C18) A/C Pressure Sensor Signal circuit at the A/C Pressure Sensor harness connector.
  Is the resistance below 10k Ohms?
  
  Yes
  - Repair the (C18) A/C Pressure Sensor Signal circuit for a short to ground.
  - Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
  No
  - Go To 3
CHECK FOR THE (C18) A/C PRESSURE SENSOR SIGNAL CIRCUIT SHORTED TO THE (K400) SENSOR RETURN
1. Measure the resistance between the (C18) A/C Pressure Sensor Signal circuit and the (K400) Sensor Return circuit at the A/C Pressure Sensor harness connector.
  Is the resistance below 10k Ohms?
  
  Yes
  - Repair the short between the (C18) A/C Pressure Sensor Signal circuit and the (K400) Sensor Return circuit.
  - Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
  No
  - Go To 4
CHECK THE (C18) A/C PRESSURE SENSOR SIGNAL CIRCUIT FOR AN OPEN/HIGH RESISTANCE
1. Measure the resistance of the (C18) A/C Pressure Sensor Signal circuit between the A/C Pressure Sensor harness connector and the PCM C2 harness connector.
  Is the resistance below 5.0 Ohms?
  
  Yes
  - Go To 5
  No
  - Repair the (C18) A/C Pressure Sensor Signal circuit for an open or high resistance.
  - Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
A/C PRESSURE SENSOR
1. Reconnect the PCM C2 harness connector.
2. Turn the ignition on.
3. With the scan tool, record all Freeze frame data.
4. With the scan tool, erase DTCs.
5. Turn the ignition off for 75 seconds.
6. Turn the ignition on.
7. While monitoring the scan tool, use a jumper wire to connect the (F856) 5-Volt Supply circuit to the (C18) A/C Pressure Sensor Signal circuit at the A/C Pressure Sensor harness connector.
  Did P0533 set?
  
  Yes
  - Replace the A/C Pressure Sensor.
  - Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
  No
  - Replace the Powertrain Control Module in accordance with the service information. Refer to MODULE, POWERTRAIN CONTROL, 6.7L DIESEL, REMOVAL .
  - Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .