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 there are any 5-Volt supply DTCs present, repair those DTCs before proceeding.
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 to the INTERMITTENT CONDITION diagnostic procedure. Refer to INTERMITTENT DTC .
CHECK THE (K648) HUMIDITY SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE
1. Turn the engine off.
2. Disconnect the MAF/Intake Air Sensor harness connector.
3. Turn the ignition on, engine off.
4. Measure the voltage on the (K648) Humidity Signal circuit at the MAF/Intake Air Sensor harness connector.
  Is the voltage above 5.2 Volts?
  
  Yes
  - Repair the (K648) Humidity Signal circuit for a short to voltage.
  - Perform the PCM VERIFICATION TEST. Refer to PCM VERIFICATION TEST .
  No
  - Go To 3
CHECK THE (K648) HUMIDITY CIRCUIT FOR AN OPEN/HIGH RESISTANCE
1. Turn the engine off.
2. Disconnect the PCM C1 harness connector.
3. Measure the resistance of the (K648) Humidity Signal circuit between the MAF/Intake Air Sensor harness connector and the PCM C1 harness connector.
  Is the resistance above 5.0 Ohms?
  
  Yes
  - Repair the (K648) Humidity Signal circuit for an open/high resistance.
  - Perform the PCM VERIFICATION TEST. Refer to PCM VERIFICATION TEST .
  No
  - Go To 4
MAF/INTAKE AIR SENSOR
1. Replace the MAF/Intake Air Sensor in accordance with the service information. Refer to SENSOR, MASS AIRFLOW (MAF), REMOVAL .
2. Reconnect the MAF/Intake Air Sensor harness connector.
3. Reconnect the PCM C1 harness connector.
4. Turn the ignition on.
5. With the scan tool, erase PCM DTCs.
6. Perform several ignition key cycles leaving the ignition on for at least 10 seconds per cycle.
7. Start the engine and let it run for two minutes.
8. With the scan tool, read PCM DTCs.
  Does the scan tool display this DTC?
  
  Yes
  - Replace the Powertrain Control Module in accordance with the service information. Refer to MODULE, POWERTRAIN CONTROL, REMOVAL .
  - Perform the PCM VERIFICATION TEST. Refer to PCM VERIFICATION TEST .
  No
  - Test complete.
  - Perform the PCM VERIFICATION TEST. Refer to PCM VERIFICATION TEST .