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Diagnostic Test

WARNING: This page is about a different car, the 2005 Jeep Grand Cherokee. However, it is still accessible from the selected car via links, so may be relevant.
  1. 1)  ACTIVE DTC 
    NOTE: When this DTC is Active the engine speed, torque, and vehicle speed are limited to a Limp in mode.

    Ignition on, engine not running.

    NOTE: If the P2118 is intermittent, it is possible that the controller is overheating in extreme hot temperatures, and this is considered a normal protection operation. No repair is necessary.

    With a scan tool, read DTCs.

    Look closely at the temperatures at which this DTC set.

    Is the DTC active at this time? 

    Yes 

    1. Go To step  2).

    No 

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

    Turn the ignition off.

    Remove the Air Cleaner Assembly from the Throttle Body.

    Check for any signs of a foreign material (ice or dirt) on the Throttle Plate or in the bore causing the Throttle Plate to stick.

    Were any signs of foreign material or scoring of the throttle plate or bore found? 

    Yes 

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

    No 

    1. Go To step  3).
  3. 3)  (K124) ETC POSITIVE CIRCUIT SHORTED TO BATTERY VOLTAGE 
    Fig 1: Checking Electronic Throttle Control Positive Circuit
    GC0027203Courtesy of DAIMLERCHRYSLER CORP.

    Turn the ignition off.

    Disconnect the Throttle Body harness connector.

    Disconnect the C2 PCM harness connector.

    Ignition on, engine not running.

    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 diagnosis.

    With a 12-volt test light connected to ground, probe the (K124) ETC Positive circuit at the appropriate terminal of 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 step  4).
  4. 4)  (K126) ETC NEGATIVE CIRCUIT SHORTED TO BATTERY VOLTAGE 
    Fig 2: Checking Electronic Throttle Control Negative Circuit
    GC0027204Courtesy of DAIMLERCHRYSLER CORP.

    Using a 12-volt test light connected to ground, probe the (K126) ETC Negative circuit at the appropriate terminal of special tool #8815.

    Does the test light illuminate brightly? 

    Yes 

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

    No 

    1. Go To step  5).
  5. 5)  (K124) ETC POSITIVE CIRCUIT SHORTED TO THE (K126) ETC NEGATIVE CIRCUIT 
    Fig 3: Checking Electronic Throttle Control Positive Circuit & Negative Circuit
    GC0027209Courtesy of DAIMLERCHRYSLER CORP.

    Measure the resistance between the (K124) ETC Positive circuit and the (K126) ETC Negative circuit at the appropriate terminals of special tool #8815.

    Is the resistance below 100 ohms? 

    Yes 

    1. Repair the short to between the (K124) ETC Positive circuit and the (K126) ETC Negative circuit.
    2. Perform POWERTRAIN VERIFICATION TEST .

    No 

    1. Go To step  6).
  6. 6)  (K124) ETC POSITIVE CIRCUIT OPEN 
    Fig 4: Checking Electronic Throttle Control Positive Circuit
    GC0027205Courtesy 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 step  7).

    No 

    1. Repair the open in the (K124) ETC Positive circuit.
    2. Perform POWERTRAIN VERIFICATION TEST .
  7. 7)  (K124) ETC POSITIVE CIRCUIT SHORTED TO GROUND 
    Fig 5: Checking Electronic Throttle Control Positive Circuit
    GC0027207Courtesy of DAIMLERCHRYSLER CORP.

    Measure the resistance between ground and the (K124) ETC Positive circuit between the appropriate terminals 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 step  8).
  8. 8)  (K126) ETC NEGATIVE CIRCUIT OPEN 
    Fig 6: Checking Electronic Throttle Control Negative Circuit
    GC0027206Courtesy of DAIMLERCHRYSLER CORP.

    Measure the resistance of the (K126) ETC Negative 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 step  9).

    No 

    1. Repair the open in the (K126) ETC Negative circuit.
    2. Perform POWERTRAIN VERIFICATION TEST .
  9. 9)  (K126) ETC NEGATIVE CIRCUIT SHORTED TO GROUND 
    Fig 7: Checking Electronic Throttle Control Negative Circuit
    GC0027208Courtesy of DAIMLERCHRYSLER CORP.

    Measure the resistance between ground and the (K126) ETC Negative circuit between the appropriate terminals of 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 step  10).
  10. 10)  ETC MOTOR 
    Fig 8: Checking Electronic Throttle Control Positive Circuit & Negative Circuit
    GC0027209Courtesy of DAIMLERCHRYSLER CORP.
    NOTE: Take the following measurement using special tool #8815 to avoid possible damage to the Throttle Body harness connector.

    Measure the resistance of the ETC Motor between the (K124) ETC Positive circuit and the (K126) ETC Negative circuit at the appropriate terminals of special tool #8815.

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

    Yes 

    1. Go To step  11).

    No 

    1. Replace the Throttle Body Assembly. Disconnect the Battery when replacing the Throttle Body Assembly. After installation is complete, use a scan tool and select the ETC RELEARN function.
    2. Perform POWERTRAIN VERIFICATION TEST .
  11. 11)  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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