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.
  Did the DTC return?
  
  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
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 on, engine not running.
2. Disconnect the (K174) Intake Air Heater Relay Control circuit connector at the Intake Air Heater Relay.
3. Using a scan tool, actuate the Cold Start Aid Driver 1 Output circuit.
  NOTE:
  Set the actuation to on.
4. Using a voltmeter, probe the (K174) Intake Air Heater Relay Control circuit at the connector.
  Does the voltmeter read equivalent to battery voltage?
  
  Yes
  - Go To 4.
  No
  - Go To 3.
CHECK THE (K174) INTAKE AIR HEATER RELAY CONTROL CIRCUIT FOR AN OPEN/HIGH RESISTANCE
1. Turn ignition off.
2. Disconnect the PCM C2 harness connector.
3. Measure the resistance of the (K174) Intake Air Heater Relay Control circuit between the Intake Air Heater Relay and the PCM C2 harness connector.
  Is the resistance below 5.0 Ohms?
  
  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 the (K174) Intake Air Heater Relay Control circuit for an open or high resistance.
  - Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
CHECK THE (K974) INTAKE AIR HEATER RELAY CONTROL RETURN CIRCUIT
1. Turn ignition off.
2. Disconnect the (K974) Intake Air Heater Relay Control Return circuit connector at the Intake Air Heater Relay.
3. Using a voltmeter connected to battery positive, probe the (K974) Intake Air Heater Relay Control Return circuit at the connector.
  Does the voltmeter read equivalent to battery voltage?
  
  Yes
  - Replace the Intake Air Heater Relay in accordance with the service information.
  - Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
  No
  - Go To 5.
CHECK THE (K974) INTAKE AIR HEATER RELAY CONTROL RETURN FOR AN OPEN/HIGH RESISTANCE
1. Disconnect the PCM C2 harness connector.
2. Measure the resistance of the (K974) Intake Air Heater Relay Control Return circuit between the Intake Air Heater Relay connector and the PCM C2 harness connector.
  Is the resistance below 5.0 Ohms?
  
  Yes
  - Repair the (K974) Intake Air Heater Relay Control Return circuit for an open or high resistance.
  - 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.
  - Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .