Diagnostic Test

WARNING: This page is about a different car, the 2014 RAM 1500. However, it is still accessible from the selected car via links, so may be relevant.

ACTIVE DTC
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 (K372) EXHAUST TEMPERATURE CATALYST SENSOR SIGNAL CIRCUIT FOR A SHORT TO GROUND
1. Turn the ignition off.
2. Disconnect the Exhaust Temperature Catalyst Sensor harness connector.
3. Disconnect the PCM C2 harness connector.
4. Measure the resistance between ground and the (K372) Exhaust Temperature Catalyst Sensor Signal circuit at the Exhaust Temperature Catalyst Sensor harness connector.
  Is the resistance above 10k Ohms?
  
  Yes
  - Go To 3
  No
  - Repair the (K372) Exhaust Temperature Catalyst Sensor Signal circuit for a short to ground.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to PCM VERIFICATION TEST .
CHECK THE (K372) EXHAUST TEMPERATURE CATALYST SENSOR SIGNAL CIRCUIT FOR A SHORT TO THE (K900) SENSOR GROUND
1. Measure the resistance between the (K372) Exhaust Temperature Catalyst Sensor Signal circuit and the (K900) Sensor Ground circuit at the Exhaust Temperature Catalyst Sensor harness connector.
  Is the resistance above 10k Ohms?
  
  Yes
  - Go To 4
  No
  - Repair the short between the (K372) Exhaust Temperature Catalyst Sensor Signal circuit and the (K900) Sensor Ground circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to PCM VERIFICATION TEST .
CHECK THE EXHAUST TEMPERATURE CATALYST SENSOR
1. Reconnect the Exhaust Temperature Catalyst Sensor harness connector.
2. Reconnect the PCM C2 harness connector.
3. Turn the ignition on.
4. With the scan tool, erase DTCs.
5. Turn the ignition off for 75 seconds.
6. Disconnect the Exhaust Temperature Catalyst Sensor harness connector.
7. Turn the ignition on.
8. With the scan tool, read DTCs.
  Does the DTC P0428 become active?
  
  Yes
  - Replace the Exhaust Temperature Catalyst Sensor in accordance with the service information.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to PCM VERIFICATION TEST .
  No
  - Replace the Powertrain Control Module in accordance with the service information.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to PCM VERIFICATION TEST .