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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 

    Ignition on, engine not running.

    With a scan tool, read DTCs.

    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)  EGR POSITION VOLTAGE 
    NOTE: Diagnose all other EGR DTC(s) before continuing.

    Start the engine.

    With a scan tool, read the EGR Position Sensor voltage.

    Choose a conclusion that best matches the EGR voltage reading. 

    Below 3.5 volts 

    1. Go To step  3).

    Between 3.5 volts to 4.3 volts 

    1. Go To step  5).

    Above 4.3 volts 

    1. Go To step  6).
  3. 3)  EXCESSIVE RESISTANCE IN THE (F856) 5-VOLT SUPPLY CIRCUIT 
    Fig 1: Checking 5-Volt Supply Circuit
    GC0002860Courtesy of DAIMLERCHRYSLER CORP.

    Turn the ignition off.

    Disconnect the EGR Solenoid harness connector.

    Disconnect the C1 and C2 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 (F856) 5-volt Supply circuit from the EGR Solenoid harness connector to the appropriate terminal of special tool #8815.

    Is the resistance below 5.0 ohms? 

    Yes 

    1. Go To step  4).

    No 

    1. Repair the excessive resistance in the (F856) 5-volt Supply circuit.
    2. Perform POWERTRAIN VERIFICATION TEST .
  4. 4)  (K34) EGR SENSOR SIGNAL CIRCUIT SHORTED TO GROUND 
    Fig 2: Checking EGR Sensor Signal Circuit
    GC0002862Courtesy of DAIMLERCHRYSLER CORP.

    Measure the resistance between ground and the (K34) EGR Sensor Signal circuit in the EGR Solenoid harness connector.

    Is the resistance below 5.0 ohms? 

    Yes 

    1. Repair the short to ground in the (K34) EGR Sensor Signal circuit.
    2. Perform POWERTRAIN VERIFICATION TEST .

    No 

    1. Replace the EGR Assembly.
    2. Perform POWERTRAIN VERIFICATION TEST .
  5. 5)  (K35) EGR SOLENOID CONTROL CIRCUIT 

    Ignition on, engine not running.

    With the scan tool, actuate the EGR Solenoid.

    Allow the EGR Solenoid to actuate for at least 15 seconds.

    Feel the EGR Solenoid for operation.

    Stop actuation.

    Does EGR Solenoid operate while actuating and then turn off when actuation test is stopped? 

    a. Yes 

    1. Refer to INTERMITTENT CONDITION .
    2. Perform POWERTRAIN VERIFICATION TEST .

    No 

    1. Refer to the P0403-EGR Control Circuit diagnostic procedure and continue.
    2. Perform POWERTRAIN VERIFICATION TEST .
  6. 6)  (K34) EGR SENSOR SIGNAL CIRCUIT 
    Fig 3: Checking EGR Position Sensor Signal Circuit
    GC0002864Courtesy of DAIMLERCHRYSLER CORP.

    Turn the ignition off.

    Disconnect the EGR Solenoid harness connector.

    Ignition on, engine not running.

    Measure the voltage of the (K34) EGR Sensor Signal circuit in the EGR Solenoid harness connector.

    Is the voltage above 4.30 volts? 

    Yes 

    1. Go To step  7).

    No 

    1. Go To step  8).
  7. 7)  (K900) SENSOR GROUND CIRCUIT OPEN  
    Fig 4: Checking EGR Position Sensor Ground Circuit
    GC0002863Courtesy of DAIMLERCHRYSLER CORP.

    Turn the ignition off.

    Disconnect the C2 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 diagnosis.

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

    Is the resistance below 5.0 ohms? 

    Yes 

    1. Replace the EGR Assembly.
    2. Perform POWERTRAIN VERIFICATION TEST .

    No 

    1. Repair the open in the (K900) Sensor ground circuit.
    2. Perform POWERTRAIN VERIFICATION TEST .
  8. 8)  (K34) EGR SENSOR SIGNAL CIRCUIT OPEN 
    Fig 5: Checking EGR Position Sensor Signal Circuit
    GC0002861Courtesy of DAIMLERCHRYSLER CORP.

    Turn the ignition off.

    Disconnect the C2 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 diagnosis.

    Measure the resistance of the (K34) EGR Sensor Signal circuit from the EGR Solenoid 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 (K34) EGR Sensor Signal circuit.
    2. Perform POWERTRAIN VERIFICATION TEST .
  9. 9)  (K34) EGR SENSOR SIGNAL CIRCUIT SHORTED TO GROUND 
    Fig 6: Checking EGR Sensor Signal Circuit
    GC0002862Courtesy of DAIMLERCHRYSLER CORP.

    Measure the resistance between ground and the (K34) EGR Sensor Signal circuit in the EGR Solenoid harness connector.

    Is the resistance below 100 ohms? 

    Yes 

    1. Repair the short to ground in the (K34) EGR Sensor Signal circuit.
    2. Perform POWERTRAIN VERIFICATION TEST .

    No 

    1. Go To step  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 POWERTRAIN VERIFICATION TEST .

    No 

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