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Home >> Jeep >> 2007 >> Commander Base, 4.7 P, AWD >> Repair and Diagnosis >> Engine Performance >> System >> DTCS P0325 To P0501 >> P0403-EGR Solenoid Circuit >> Diagnostic Test

Diagnostic Test

  1. 1) DTC IS ACTIVE 

    Turn the ignition on.

    With the scan tool, Clear DTCs in the Powertrain Control Module (PCM).

    With the scan tool, actuate the EGR Valve Solenoid Duty Cycle to 79.9%.

    With the scan tool, select View DTCs.

    Is the DTC Active at this time? 

    Yes 

    1. Go to  2).

    No 

    1. Refer to INTERMITTENT CONDITION Diagnostic Procedure.
  2. 2) (K35) EGR CONTROL CIRCUIT SHORTED TO VOLTAGE 
    Fig 1: Checking EGR Solenoid Control Circuit For Short To Voltage
    GC0014970Courtesy of CHRYSLER LLC

    Turn the ignition off.

    Disconnect the EGR Valve Assembly connector.

    Disconnect the C2 PCM harness connector.

    Turn the ignition on.

    Measure the voltage of the (K35) EGR Control circuit in the EGR Valve Assembly harness connector.

    Is there any voltage present? 

    Yes 

    1. Repair the short to voltage in the (K35) EGR Control circuit.
    2. Perform POWERTRAIN VERIFICATION TEST .

    No 

    1. Go to  3).
  3. 3) (K35) EGR CONTROL CIRCUIT SHORTED TO GROUND 
    Fig 2: Checking EGR Solenoid Control Circuit for Short To Ground
    GC0014972Courtesy of CHRYSLER LLC

    Turn the ignition off.

    Measure the resistance between ground and the (K35) EGR Control circuit in the EGR Valve Assembly harness connector.

    Is the resistance above 100 ohms? 

    Yes 

    1. Go to  4).

    No 

    1. Repair the short to ground in the (K35) EGR Control circuit.
    2. Perform POWERTRAIN VERIFICATION TEST .
  4. 4) (K35) EGR CONTROL CIRCUIT OPEN OR HIGH RESISTANCE 
    Fig 3: Checking EGR Solenoid Control Circuit For Open Or High Resistance
    GC0014973Courtesy of CHRYSLER LLC
    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 (K35) EGR Control circuit between the EGR Valve Assembly harness connector and the appropriate terminal of special tool #8815.

    Is the resistance below 5.0 ohms? 

    Yes 

    1. Go to  5).

    No 

    1. Repair the excessive resistance in the (K35) EGR Control circuit.
    2. Perform POWERTRAIN VERIFICATION TEST .
  5. 5) (Z42) GROUND CIRCUIT OPEN OR HIGH RESISTANCE 
    Fig 4: Checking EGR Solenoid Ground Circuit
    GC0014971Courtesy of CHRYSLER LLC

    Using a 12 volt test light connected to 12 volts, check the (Z42) Ground circuit in the EGR Valve Assembly harness connector.

    NOTE: The test light should be illuminated and bright. Compare the brightness to that of a direct connection to the battery.

    Is the test light illuminated and bright? 

    Yes 

    1. Go to  6).

    No 

    1. Repair the excessive resistance in the (Z42) Ground circuit.
    2. Perform POWERTRAIN VERIFICATION TEST .
  6. 6) EGR VALVE ASSEMBLY 

    Connect the C2 PCM harness connector.

    Turn the ignition on.

    With the scan tool, actuate the EGR Valve Solenoid Duty Cycle.

    Select the Duty Cycle reading of 79.9%

    Using a 12 volt test light connected to ground, check the (K35) EGR Control circuit in the EGR Valve Assembly harness connector.

    NOTE: If the DTC is active, the actuation test may not be allowed by the PCM. If may be necessary to clear the DTCs before starting the actuation.
    NOTE: The voltage supplied to the solenoid circuit during the actuation may be less than battery voltage. The test light should be illuminated, but may not be as bright as a direct connection to the battery.
    NOTE: The test light should be illuminated and bright proportional to the maximum duty cycle allowed by the scan tool. For example, if the scan tool allows 100% actuation, the brightness should be as bright as a direct connection to the battery. If the scan tool allows a maximum 25% actuation, the brightness should be 25% as bright as a direct connection to the battery.

    Does the test light illuminate accordingly during the actuation? 

    Yes 

    1. Verify that there is good pin to terminal contact in the Solenoid and the Powertrain Control Module connectors. Replace the EGR Valve Assembly in accordance with the Service Information if no problems were found with the connectors.
    2. Perform POWERTRAIN VERIFICATION TEST .

    No 

    1. Go to  7).
  7. 7) POWERTRAIN CONTROL MODULE (PCM) 

    Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the EGR Solenoid Assembly 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. Verify that there is good pin to terminal contact in the Solenoid and the Powertrain Control Module connectors.

    Refer to any Technical Service Bulletins that may apply.

    Were any problems found? 

    Yes 

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

    No 

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