Diagnostic Test

WARNING: This page is about a different car, the 2015 RAM 3500 HD and 2015 RAM 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.

CHECK FOR AN ACTIVE DTC
NOTE:
Maximum engine speed could be reduced while this fault is active, it just depends where the throttle gets stuck.
1. Turn the ignition on.
  NOTE:
  The PCM tests the ETC Motor by opening and closing the Throttle Plate before starting the engine. If during this test the Throttle Plate does not return to the closed position this DTC sets.
2. With a scan tool, read the active DTCs.
  NOTE:
  Diagnose any TPS or 5-Volt Supply DTCs before continuing.
  
  Is the DTC active?
  
  Yes
  - Go To 2
  No
  - Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to INTERMITTENT CONDITION .
THROTTLE PLATE STUCK OPEN
1. Turn the ignition off.
  NOTE:
  The PCM tests the ETC Motor by opening and closing the Throttle Plate before starting the engine. If during this test the Throttle Plate does not return to the closed position this DTC sets.
2. Remove the Air Cleaner Assembly from the Throttle Body. Refer to BODY, AIR CLEANER, REMOVAL, 5.7L .
3. Check for any signs of a foreign material causing the Throttle to remain open.
4. Using a scan tool, under System Tests, perform the ETC Throttle Follower Test.
5. Have an assistant watch the throttle plate to verify it moves during the test.
  Does the Throttle Plate move?
  
  Yes
  - Go To 3
  No
  - Remove the debris if possible or replace the Throttle Body Assembly if signs of physical damage are present. Refer to THROTTLE BODY, REMOVAL . Disconnect the Battery when replacing the Throttle Body Assembly. After installation is complete, use a scan tool and perform the ETC RELEARN function.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
TPS 1 AND TPS 2 BOTH EQUAL 2.5 VOLTS
1. With a scan tool, perform the ETC Throttle Follower test while reading both TPS voltage readings.
  Are both TPS readings stuck at 2.5 volts?
  
  Yes
  - Check the TPS Signal circuits for excessive resistance, being shorted to each other, or shorted to the Sensor Return circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 4
CHECK THE (K447) ETC MOTOR (+) CIRCUIT FOR A SHORT TO VOLTAGE
1. Turn the ignition off.
2. Disconnect the Throttle Body harness connector.
3. Disconnect the PCM C2 harness connector.
4. Turn the ignition on.
5. Measure the voltage between ground and the (K447) ETC Motor (+) circuit at the Throttle Body harness connector.
  Is there any voltage present?
  
  Yes
  - Repair the (K447) ETC Motor (+) circuit for a short to voltage.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 5
CHECK THE (K447) ETC MOTOR (+) CIRCUIT FOR AN OPEN/HIGH RESISTANCE
1. Turn the ignition off.
  CAUTION:
  Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install the GPEC Diagnostic Adaptor to perform the diagnosis.
2. Connect the (special tool #10436, Adapter, GPEC Diagnostic).
3. Measure the resistance of the (K447) ETC Motor (+) circuit from the Throttle Body harness connector to the GPEC Adaptor.
  Is the resistance below 3.0 Ohms?
  
  Yes
  - Go To 6
  No
  - Repair the (K447) ETC Motor (+) circuit for an open or high resistance.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
CHECK THE (K448) ETC MOTOR (-) CIRCUIT FOR AN OPEN/HIGH RESISTANCE
1. Measure the resistance of the (K448) ETC Motor (-) circuit from the Throttle Body harness connector to the GPEC Adaptor.
  Is the resistance below 3.0 Ohms?
  
  Yes
  - Go To 7
  No
  - Repair the (K448) ETC Motor (-) circuit for an open or high resistance.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
CHECK THE (K447) ETC MOTOR (+) CIRCUIT FOR A SHORT TO GROUND
1. Check for continuity between ground and the (K447) ETC Motor (+) circuit at the Throttle Body harness connector.
  Is there continuity between ground and the (K447) ETC Motor (+) circuit?
  
  Yes
  - Repair the (K447) ETC Motor (+) circuit for a short to ground.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 8
CHECK THE (K448) ETC MOTOR (-) CIRCUIT FOR A SHORT TO GROUND
1. Check for continuity between ground and the (K448) ETC Motor (-) circuit at the Throttle Body harness connector.
  Is there continuity between ground and the (K448) ETC Motor (-) circuit?
  
  Yes
  - Repair the (K448) ETC Motor (-) circuit for a short to ground.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 9
POWERTRAIN CONTROL MODULE (PCM)
1. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Throttle Body and the Powertrain Control Module (PCM).
2. Look for any chafed, pierced, pinched, or partially broken wires.
3. Look for broken, bent, pushed out or corroded terminals. Verify that there is good pin to terminal contact in the Throttle Body and Powertrain Control Module connectors.
4. Perform any Service Bulletins that may apply.
  Were there any problems found?
  
  Yes
  - Repair as necessary.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Replace and program the Powertrain Control Module in accordance with the Service Information. Refer to MODULE, POWERTRAIN CONTROL, REMOVAL . Refer to PCM/ECM REPROGRAMMING - GAS .
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .