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Diagnostic Test

  1. 1) ACTIVE DTC 
    NOTE: Low battery voltage can cause excessive current draw in very hot and very cold ambient temperatures. Look closely at the temperatures at which this DTC set and make sure the battery can pass a load test before continuing.
    NOTE: Diagnose and repair any other DTCs set in the PCM before proceeding with this test.

    Turn the ignition on.

    With the scan tool, select View DTCs and review the DTC environmental information.

    Is the good trip counter greater than 0? 

    Yes 

    1. Refer to *CHECKING FOR AN INTERMITTENT DTC .

    No 

    1. Go to  2).
  2. 2) THROTTLE PLATE INSPECTION 

    Turn the ignition off.

    Remove the air cleaner assembly.

    Check for any signs of a foreign material (ice, dirt, or excessive carbon build up) on the throttle plate or in the bore causing the throttle plate to stick.

    Were any problems found? 

    Yes 

    1. Remove the debris if possible or replace the Throttle Body. Disconnect the battery when replacing the Throttle Body. After installation is complete, use a scan tool and perform the ETC RELEARN function.
    2. Perform PCM VERIFICATION TEST .

    No 

    1. Go to  3).
  3. 3) DIRTY AIR FILTER 

    Remove and inspect the air filter.

    Were any problems found? 

    Yes 

    1. Replace the air filter.
    2. Perform PCM VERIFICATION TEST .

    No 

    1. Go to  4).
  4. 4) CONTAMINATED FUEL 

    Inspect the fuel for contamination. (dirt, water, or other foreign material)

    Were any problems found? 

    Yes 

    1. Drain the fuel from the fuel tank into an approved gas holding tank and add clean fuel. Refer to STANDARD PROCEDURE .

    No 

    1. Go to  5).
  5. 5) EXCESSIVE RESISTANCE IN THE (K124) ETC MOTOR (+) CIRCUIT 

    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 Miller Special Tool #8815 along with the #8815-1 to perform the diagnosis.

    Using a voltmeter, perform a voltage drop test by backprobing the (K124) ETC Motor (+) circuit at the Throttle Body harness connector and by probing the appropriate terminal of the special tool #8815. Make sure the voltmeter leads are connected so that positive polarity is displayed on the voltmeter.

    WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts, or fan. Do not wear loose clothing. Failure to follow these instructions can result in personal injury or death.

    Start the engine.

    Is the voltage below 0.5 volts? 

    Yes 

    1. Go to  6).

    No 

    1. Repair the (K124) ETC Motor (+) for excessive resistance.
    2. Perform PCM VERIFICATION TEST .
  6. 6) EXCESSIVE RESISTANCE IN THE (K126) ETC MOTOR (-) CIRCUIT 

    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 Miller Special Tool #8815 along with the #8815-1 to perform the diagnosis.

    Using a voltmeter, perform a voltage drop test by backprobing the (K126) ETC Motor (-) circuit at the Throttle Body harness connector and by probing the appropriate terminal of the special tool #8815. Make sure the voltmeter leads are connected so that positive polarity is displayed on the voltmeter.

    WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts, or fan. Do not wear loose clothing. Failure to follow these instructions can result in personal injury or death.

    Start the engine.

    Is the voltage below 0.5 volts? 

    Yes 

    1. Go to  7).

    No 

    1. Repair the (K126) ETC Motor (-) for excessive resistance.
    2. Perform PCM VERIFICATION TEST .
  7. 7) THROTTLE BODY 

    Turn the ignition off.

    Disconnect special tool #8815-1 from the C2 PCM harness connector.

    NOTE: Use special tool #8815 to avoid possible damage to the Throttle Body harness connector.

    Measure the resistance of the ETC Motor by probing the appropriate terminals of special tool #8815 for the (K124) ETC Motor (+) circuit and the (K126) ETC Motor (-) circuit.

    Is the resistance between 2.5 and 25 ohms at closed throttle? 

    Yes 

    1. Go to  8).

    No 

    1. Replace the Throttle Body. Disconnect the battery when replacing the Throttle Body. After installation is complete, use a scan tool and perform the ETC RELEARN function.
    2. Perform PCM VERIFICATION TEST .
  8. 8) POWERTRAIN CONTROL MODULE (PCM) 

    Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Throttle Body and the Powertrain Control Module (PCM).

    Look for any chafed, pierced, pinched, or partially broken wires.

    Look for broken, bent, pushed out or corroded terminals.

    Refer to any Technical Service Bulletins that may apply.

    Were any problems found? 

    Yes 

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

    No 

    1. Replace the Powertrain Control Module (PCM) in accordance with the Service Information.
    2. Perform PCM VERIFICATION TEST .
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