Diagnostic Test

WARNING: This page is about a different car, the 2013 RAM 2500 HD and 2012 RAM Pickup. However, it is still accessible from the selected car via links, so may be relevant.

ACTIVE DTC
NOTE:
Maximum engine speed could be reduced while this fault is active, depending on where the throttle gets stuck.
1. Ignition on, engine not running.
2. With a scan tool, read the active DTCs.
  NOTE:
  Diagnose any TPS or 5-Volt Supply DTCs before continuing.
  
  Is the DTC Active at this time?
  
  Yes
  - Go To 2
  No
  - Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to STANDARD PROCEDURE .
THROTTLE PLATE STUCK OPEN
1. Turn the ignition off.
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 STANDARD PROCEDURE .
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 both 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 STANDARD PROCEDURE .
  No
  - Go To 4
CHECK THE (K447) ETC POSITIVE 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. Ignition on, engine not running.
5. Measure the voltage on the (K447) ETC Positive circuit at the Throttle Body harness connector.
  Is there any voltage present?
  
  Yes
  - Repair the (K447) ETC Positive circuit for a short to voltage.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Go To 5
CHECK THE (K447) ETC POSITIVE 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 Positive circuit from the Throttle Body harness connector to the GPEC Adaptor.
  Is the resistance below 5.0 Ohms?
  
  Yes
  - Go To 6
  No
  - Repair the (K447) ETC Positive circuit for an open or high resistance.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to STANDARD PROCEDURE .
CHECK THE (K448) ETC NEGATIVE CIRCUIT FOR AN OPEN/HIGH RESISTANCE
1. Measure the resistance of the (K448) ETC Negative circuit from the Throttle Body harness connector to the GPEC Adaptor.
  Is the resistance below 5.0 Ohms?
  
  Yes
  - Go To 7
  No
  - Repair the (K448) ETC Negative circuit for an open or high resistance.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to STANDARD PROCEDURE .
CHECK THE (K447) ETC POSITIVE CIRCUIT FOR A SHORT TO GROUND
1. Measure the resistance between ground and the (K447) ETC Positive circuit at the Throttle Body harness connector.
  Is the resistance above 10k Ohms?
  
  Yes
  - Go To 8
  No
  - Repair the (K447) ETC Positive circuit for a short to ground.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to STANDARD PROCEDURE .
CHECK THE (K448) ETC NEGATIVE CIRCUIT FOR A SHORT TO GROUND
1. Measure the resistance between ground and the (K448) ETC Negative circuit at the Throttle Body harness connector.
  Is the resistance below 10k Ohms?
  
  Yes
  - Repair the (K448) ETC Negative circuit for a short to ground.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  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 Technical Service Bulletins that may apply.
  Were there any problems found?
  
  Yes
  - Repair as necessary.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Replace and program the Powertrain Control Module in accordance with the Service Information. Refer to appropriate service information MODULE, POWERTRAIN CONTROL, REMOVAL .
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to STANDARD PROCEDURE .