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Diagnostic Test

WARNING: This page is about a different car, the 2006 Dodge Magnum, 2006 Dodge Charger, and 2006 Chrysler 300. However, it is still accessible from the selected car via links, so may be relevant.
  1. 1)  ACTIVE DTC 
    NOTE: Maximum engine speed could be reduced while this fault is active, it just depends where the throttle gets stuck.

    Ignition on, engine not running.

    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.

    With a scan tool read DTCs.

    NOTE: Diagnose any TP Sensor or 5-Volt Supply DTCs before continuing.

    Is the DTC active at this time? 

    Yes 

    1. Go To  2).

    No 

    1. Refer to INTERMITTENT CONDITION .
    2. Perform POWERTRAIN VERIFICATION TEST .
  2. 2)  THROTTLE PLATE STUCK OPEN 

    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.

    Remove the Air Cleaner Assembly from the Throttle Body.

    Check for any signs of a foreign material causing the Throttle to remain open.

    Using a scan tool actuate the ETC Motor.

    Does the Throttle Plate move? 

    Yes 

    1. Go To  3).

    No 

    1. Remove the debris if possible or replace the Throttle Body Assembly if signs of physical damage are present. Disconnect the Battery when replacing the Throttle Body Assembly. After installation is complete, use a scan tool and perform the ETC RELEARN function.
    2. Perform POWERTRAIN VERIFICATION TEST .
  3. 3)  TP SENSOR NO.1 AND TP SENSOR NO.2 BOTH EQUAL 2.5 VOLTS 

    With a scan tool, perform the Throttle Follower test while reading both TP Sensor voltage readings.

    Are both TP Sensor readings stuck at 2.5 volts? 

    Yes 

    1. Check the TP Sensor Signal circuits for excessive resistance, being shorted to each other, or shorted to the Sensor Return circuit.
    2. Perform POWERTRAIN VERIFICATION TEST .

    No 

    1. Go To  4).
  4. 4)  (K124) ETC POSITIVE CIRCUIT SHORTED TO BATTERY VOLTAGE 
    Fig 1: Checking Electronic Throttle Control Positive Circuit
    GC0015128Courtesy of DAIMLERCHRYSLER CORP.

    Turn the ignition off.

    Disconnect the Throttle Body harness connector.

    Disconnect the C3/C PCM harness connector.

    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 Miller Special Tool #8815 to perform the diagnostics.

    Ignition on, engine not running.

    With a 12-volt test light connected to ground, probe the (K124) ETC Positive circuit at the appropriate terminal of the special tool #8815.

    Does the test light illuminate brightly? 

    Yes 

    1. Repair the short to battery voltage on the (K124) ETC Positive circuit.
    2. Perform POWERTRAIN VERIFICATION TEST .

    No 

    1. Go To  5).
  5. 5)  (K124) ETC POSITIVE CIRCUIT OPEN 
    Fig 2: Checking Electronic Throttle Control Positive Circuit
    GC0015131Courtesy of DAIMLERCHRYSLER CORP.

    Turn the ignition off.

    Measure the resistance of the (K124) ETC Positive circuit from the Throttle Body harness connector to the appropriate terminal of special tool #8815.

    Is the resistance below 5.0 ohms? 

    Yes 

    1. Go To  6).

    No 

    1. Repair the open in the (K124) ETC Positive circuit.
    2. Perform POWERTRAIN VERIFICATION TEST .
  6. 6)  (K126) ETC NEGATIVE CIRCUIT OPEN 
    Fig 3: Checking Electronic Throttle Control Negative Circuit
    GC0015132Courtesy of DAIMLERCHRYSLER CORP.

    Measure the resistance of the (K126) ETC Negative circuit between the Throttle Body harness connector and the appropriate terminal of special tool #8815.

    Is the resistance below 5.0 ohms? 

    Yes 

    1. Go To  7).

    No 

    1. Repair the open in the (K126) ETC Negative circuit.
    2. Perform POWERTRAIN VERIFICATION TEST .
  7. 7)  (K124) ETC POSITIVE CIRCUIT SHORTED TO GROUND  
    Fig 4: Checking Electronic Throttle Control Positive Circuit
    GC0015133Courtesy of DAIMLERCHRYSLER CORP.

    Measure the resistance between a known good ground and the (K124) ETC Positive circuit at the appropriate terminal of special tool #8815.

    Is the resistance below 100 ohms? 

    Yes 

    1. Repair the short to ground in the (K124) ETC Positive circuit.
    2. Perform POWERTRAIN VERIFICATION TEST .

    No 

    1. Go To  8).
  8. 8)  (K126) ETC NEGATIVE CIRCUIT SHORTED TO GROUND 
    Fig 5: Checking Electronic Throttle Control Negative Circuit
    GC0015134Courtesy of DAIMLERCHRYSLER CORP.

    Measure the resistance between a known good ground and the (K126) ETC Negative circuit at the appropriate terminal of the special tool #8815.

    Is the resistance below 100 ohms? 

    Yes 

    1. Repair the short to ground in the (K126) ETC Negative circuit.
    2. Perform POWERTRAIN VERIFICATION TEST .

    No 

    1. Go To  9).
  9. 9)  PCM 
    NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.

    Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and Ground circuits.

    Were there any problems found? 

    Yes 

    1. Repair as necessary.
    2. Perform POWERTRAIN VERIFICATION TEST .

    No 

    1. Replace and program the Powertrain Control Module per Service Information.
    2. Perform POWERTRAIN VERIFICATION TEST .
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