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Diagnostic Test

  1. 1)  ACTIVE DTC 

    Ignition on, engine not running.

    With a scan tool, read DTCs.

    Is the DTC active at this time? 

    Yes 

    1. Go To  2).

    No 

    1. Refer to the INTERMITTENT CONDITION  Diagnostic Procedure.
    2. Perform the POWERTRAIN VERIFICATION TEST. (Refer to ENGINE - STANDARD PROCEDURE - POWERTRAIN VERIFICATION TEST) .
  2. 2)  (K21) IAT SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE  
    Fig 1: MEASURING VOLTAGE AT THE IAT SIGNAL CIRCUIT
    GC0041567Courtesy of DAIMLERCHRYSLER CORP.

    Turn the ignition off.

    Disconnect the PCM harness connectors.

    Disconnect the IAT Sensor harness connector.

    NOTE: Visually inspect both the component and the PCM connectors. Look for damaged, partially broken wires, and backed out or corroded terminals.

    Ignition on, engine not running.

    Measure the voltage on the (K21) IAT Signal circuit in the IAT Sensor harness connector.

    Is voltage present? 

    Yes 

    1. Repair the short to battery voltage in the (K21) IAT Signal circuit.
    2. Perform the POWERTRAIN VERIFICATION TEST. (Refer to ENGINE - STANDARD PROCEDURE - POWERTRAIN VERIFICATION TEST) .

    No 

    1. Go To  3).
  3. 3)  IAT SENSOR VOLTAGE ABOVE 4.6 VOLTS 

    Turn the ignition off.

    Connect the PCM harness connectors.

    Ignition on, engine not running.

    With a scan tool, read the IAT voltage.

    Is the voltage above 4.6 volts? 

    Yes 

    1. Go To  4).

    No 

    1. Go To  7).
  4. 4)  IAT SENSOR 
    Fig 2: CHECKING IAT SENSOR
    GC0041562Courtesy of DAIMLERCHRYSLER CORP.

    Connect a jumper wire between the (K21) IAT Signal circuit and the (K900) Sensor ground circuit in the IAT Sensor harness connector.

    With a scan tool, read the IAT voltage.

    Is the voltage below 1.0 volt with the jumper wire installed? 

    Yes 

    1. Replace the IAT Sensor.
    2. Perform the POWERTRAIN VERIFICATION TEST. (Refer to ENGINE - STANDARD PROCEDURE - POWERTRAIN VERIFICATION TEST) .

    No 

    1. Go To  5).
      NOTE: Remove the jumper wire before continuing.
  5. 5)  (K21) IAT SIGNAL CIRCUIT OPEN 
    Fig 3: MEASURING RESISTANCE OF THE IAT SIGNAL CIRCUIT
    GC0041563Courtesy of DAIMLERCHRYSLER CORP.

    Turn the ignition off.

    Disconnect the PCM harness connectors.

    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.

    Measure the resistance of the (K21) IAT Signal circuit from the IAT Sensor 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 (K21) IAT Signal circuit.
    2. Perform the POWERTRAIN VERIFICATION TEST. (Refer to ENGINE - STANDARD PROCEDURE - POWERTRAIN VERIFICATION TEST) .
  6. 6)  (K900) SENSOR GROUND CIRCUIT OPEN  
    Fig 4: MEASURING RESISTANCE OF THE SENSOR GROUND CIRCUIT
    GC0041564Courtesy of DAIMLERCHRYSLER CORP.

    Measure the resistance of the (K900) Sensor ground circuit from the IAT Sensor harness connector to the appropriate terminal of special tool #8815.

    Is the resistance below 5.0 ohms? 

    Yes 

    1. Go To  9).

    No 

    1. Repair the open in the (K900) Sensor ground circuit.
    2. Perform the POWERTRAIN VERIFICATION TEST. (Refer to ENGINE - STANDARD PROCEDURE - POWERTRAIN VERIFICATION TEST) .
  7. 7)  (K21) IAT SIGNAL CIRCUIT SHORTED TO GROUND 
    Fig 5: MEASURING RESISTANCE BETWEEN GROUND AND IAT SIGNAL CIRCUIT
    GC0041565Courtesy of DAIMLERCHRYSLER CORP.

    Turn the ignition off.

    Disconnect the PCM harness connectors.

    Measure the resistance between ground and the (K21) IAT Signal circuit in the IAT Sensor harness connector.

    Is the resistance below 100 ohms? 

    Yes 

    1. Repair the short to ground in the (K21) IAT Signal circuit.
    2. Perform the POWERTRAIN VERIFICATION TEST. (Refer to ENGINE - STANDARD PROCEDURE - POWERTRAIN VERIFICATION TEST) .

    No 

    1. Go To  8).
  8. 8)  (K21) IAT SIGNAL SHORTED TO THE (K900) SENSOR GROUND  
    Fig 6: MEASURING RESISTANCE BETWEEN THE IAT SIGNAL CIRCUIT AND SENSOR GROUND CIRCUIT
    GC0041566Courtesy of DAIMLERCHRYSLER CORP.

    Measure the resistance between the (K21) IAT Signal circuit and the (K900) Sensor ground circuit in the IAT Sensor harness connector.

    Is the resistance below 5.0 ohms? 

    Yes 

    1. Repair the short between the (K900) Sensor ground and the (K21) IAT Signal circuit.
    2. Perform the POWERTRAIN VERIFICATION TEST. (Refer to ENGINE - STANDARD PROCEDURE - 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 the POWERTRAIN VERIFICATION TEST. (Refer to ENGINE - STANDARD PROCEDURE - POWERTRAIN VERIFICATION TEST) .

    No 

    1. Replace and program the Powertrain Control Module per Service Information. Refer to MODULE-POWERTRAIN CONTROL and STANDARD PROCEDURE - PCM/ECM/SKREEM PROGRAMMING .
    2. Perform the POWERTRAIN VERIFICATION TEST. (Refer to ENGINE - STANDARD PROCEDURE - POWERTRAIN VERIFICATION TEST) .
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