Diagnostic Test

WARNING: This page is about a different car, the 2011 RAM Cab & Chassis. 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, read DTCs.
  Is the DTC active?
  
  Yes
  - Go To 2.
  No
  - Perform the INTERMITTENT CONDITION - 6.7L diagnostic procedure. Refer to INTERMITTENT CONDITION - 6.7L .
CHECK THE (K174) INTAKE AIR HEATER RELAY CONTROL CIRCUIT FOR A SHORT TO GROUND
1. Turn ignition off.
2. Disconnect the (K174) Intake Air Heater Relay Control circuit connector at the Intake Air Heater Relay.
3. Disconnect the (K974) Intake Air Heater Relay Control Return circuit connector at the Intake Air Heater Relay.
4. Disconnect the PCM C2 harness connector.
5. Measure resistance between ground and the (K174) Intake Air Heater Relay Control circuit at the Intake Air Heater Relay Control circuit connector at the Intake Air Heater Relay.
  Is the resistance above 10k Ohms?
  
  Yes
  - Go To 3.
  No
  - Repair the (K174) Intake Air Heater Relay Control circuit for a short to ground.
  - Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
CHECK FOR THE (K174) INTAKE AIR HEATER RELAY CONTROL CIRCUIT SHORTED TO THE (K974) INTAKE AIR HEATER RELAY CONTROL RETURN CIRCUIT
1. Measure the resistance between the (K174) Intake Air Heater Relay Control circuit and the (K974) Intake Air Heater Relay Control Return circuit at the terminals for the Intake Air Heater Relay.
  Is the resistance above 10k Ohms?
  
  Yes
  - Go To 4.
  No
  - Repair the short between the (K174) Intake Air Heater Relay Control circuit and the (K974) Intake Air Heater Relay Control circuit.
  - Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
INTAKE AIR HEATER RELAY CONTROL
CAUTION:
Excessive actuation to the Intake Air Heater may overheat and damage the heater assembly. Allow the Intake Air heater to cool for five minutes between each actuation procedure to prevent any possible damage from overheating to occur to the Intake Air Heater.
1. Turn ignition off.
2. Replace the Intake Air Heater Relay in accordance with the service information.
3. Reconnect all previously disconnected connectors.
4. Turn ignition on.
5. With the scan tool, erase DTCs.
6. Using a scan tool, actuate the Cold Start Aid Driver 1 Output circuit.
  NOTE:
  Set the actuation to toggle.
7. With the scan tool, read DTCs.
  Did the DTC return?
  
  Yes
  - Replace the Powertrain Control Module in accordance with the service information.
  - Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
  No
  - Repair complete.
  - Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .