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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 STANDARD PROCEDURE - POWERTRAIN VERIFICATION TEST) .
  2. 2)  (F855) 5-VOLT SUPPLY CIRCUIT 
    Fig 1: CHECKING 5-VOLT SUPPLY CIRCUIT
    GC0041557Courtesy of DAIMLERCHRYSLER CORP.

    Turn the ignition off.

    Disconnect the MAP Sensor harness connector.

    Ignition on, engine not running.

    Measure the voltage on the (F855) 5-volt Supply circuit in the MAP Sensor harness connector.

    Is the voltage between 4.5 to 5.2 volts? 

    Yes 

    1. Go To  3).

    No 

    1. Go To  7).
  3. 3)  MAP SENSOR 

    With a scan tool, monitor the MAP Sensor voltage with the Sensor harness connector disconnected.

    Is the voltage above 2.2 volts? 

    Yes 

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

    No 

    1. Go To  4).
  4. 4)  (K1) MAP SIGNAL CIRCUIT OPEN 
    Fig 2: MEASURING RESISTANCE OF THE MAP SIGNAL CIRCUIT
    GC0041546Courtesy 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 (K1) MAP Signal circuit from the MAP Sensor harness connector to the appropriate terminal of special tool #8815.

    Is the resistance below 5.0 ohms? 

    Yes 

    1. Go To  5).

    No 

    1. Repair the open in the (K1) MAP Signal circuit.
    2. Perform the POWERTRAIN VERIFICATION TEST. (Refer to STANDARD PROCEDURE - POWERTRAIN VERIFICATION TEST) .
  5. 5)  (K1) MAP SIGNAL CIRCUIT SHORTED TO THE (K900) SENSOR GROUND CIRCUIT 
    Fig 3: MEASURING RESISTANCE BETWEEN THE SENSOR GROUND CIRCUIT AND MAP SIGNAL CIRCUIT
    GC0041558Courtesy of DAIMLERCHRYSLER CORP.

    Measure the resistance between the (K900) Sensor ground circuit and the (K1) MAP Signal circuit in the MAP Sensor harness connector.

    Is the resistance below 5.0 ohms? 

    Yes 

    1. Repair the short between the (K900) Sensor ground circuit and the (K1) MAP Signal circuit.
    2. Perform the POWERTRAIN VERIFICATION TEST. (Refer to STANDARD PROCEDURE - POWERTRAIN VERIFICATION TEST) .

    No 

    1. Go To  6).
  6. 6)  (K1) MAP SIGNAL CIRCUIT SHORTED TO GROUND 
    Fig 4: MEASURING RESISTANCE BETWEEN GROUND AND THE MAP SIGNAL CIRCUIT
    GC0041547Courtesy of DAIMLERCHRYSLER CORP.

    Measure the resistance between ground and the (K1) MAP Signal circuit in the MAP Sensor harness connector.

    Is the resistance below 100 ohms? 

    Yes 

    1. Repair the short to ground in the (K1) MAP Signal circuit.
    2. Perform the POWERTRAIN VERIFICATION TEST. (Refer to STANDARD PROCEDURE - POWERTRAIN VERIFICATION TEST) .

    No 

    1. Replace the Powertrain Control Module in accordance with the Service information. Refer to MODULE-POWERTRAIN CONTROL .
    2. Perform the POWERTRAIN VERIFICATION TEST. (Refer to STANDARD PROCEDURE - POWERTRAIN VERIFICATION TEST) .
  7. 7)  (F855) 5-VOLT SUPPLY CIRCUIT SHORTED TO BATTERY VOLTAGE 
    Fig 5: CHECKING 5-VOLT SUPPLY CIRCUIT
    GC0041557Courtesy of DAIMLERCHRYSLER CORP.

    Turn the ignition off.

    Disconnect the PCM harness connectors.

    Ignition on, engine not running.

    Measure the voltage on the (F855) 5-volt Supply circuit in the MAP Sensor harness connector.

    Is the voltage above 5.2 volts? 

    Yes 

    1. Repair the short to battery voltage in the (F855) 5-volt Supply circuit.
    2. Perform the POWERTRAIN VERIFICATION TEST. (Refer to STANDARD PROCEDURE - POWERTRAIN VERIFICATION TEST) .

    No 

    1. Go To  8).
  8. 8)  (F855) 5-VOLT SUPPLY CIRCUIT OPEN 
    Fig 6: MEASURING RESISTANCE OF THE 5-VOLT SUPPLY CIRCUIT
    GC0041543Courtesy of DAIMLERCHRYSLER CORP.

    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 to perform diagnosis.

    Measure the resistance of the (F855) 5-volt Supply circuit from the MAP 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 (F855) 5-volt Supply circuit.
    2. Perform the POWERTRAIN VERIFICATION TEST. (Refer to STANDARD PROCEDURE - POWERTRAIN VERIFICATION TEST) .
  9. 9)  (F855) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND 
    Fig 7: MEASURING RESISTANCE BETWEEN GROUND AND THE 5-VOLT SUPPLY CIRCUIT
    GC0041544Courtesy of DAIMLERCHRYSLER CORP.

    Measure the resistance between ground and the (F855) 5-volt Supply circuit in the MAP Sensor harness connector.

    Is the resistance below 100 ohms? 

    Yes 

    1. Repair the short to ground in the (F855) 5-volt Supply circuit.
    2. Perform the POWERTRAIN VERIFICATION TEST. (Refer to STANDARD PROCEDURE - POWERTRAIN VERIFICATION TEST) .

    No 

    1. Go To  10).
  10. 10)  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 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 STANDARD PROCEDURE - POWERTRAIN VERIFICATION TEST) .
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