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Home >> Chrysler >> 2007 >> Pacifica Base, 3.8 L >> Repair and Diagnosis >> Engine Performance >> System >> DTCS P0222 To P0420 >> P0325-Knock Sensor 1 Circuit >> Diagnostic Test

Diagnostic Test

  1. 1) DTC IS ACTIVE 

    Start the engine and allow it to reach normal operating temperature.

    WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts, or fan. Do not wear loose clothing. Failure to follow these instructions can result in personal injury or death.
    NOTE: It may be necessary to test drive the vehicle within the DTC monitoring conditions in order for this DTC to reset.

    With the scan tool, select View DTCs.

    Is the status Active for this DTC? 

    Yes 

    1. Go to  2).

    No 

    1. Refer to *CHECKING FOR AN INTERMITTENT DTC .
  2. 2) (K42) KS SIGNAL CIRCUIT SHORTED TO VOLTAGE 
    Fig 1: Measuring The Voltage Of The KS Signal Circuit In The Knock Sensor Harness Connector
    GC0049526Courtesy of CHRYSLER LLC

    Turn the ignition off.

    Disconnect the Knock Sensor connector.

    Disconnect the Powertrain Control Module (PCM) connector.

    Turn the ignition on.

    Measure the voltage of the (K42) KS Signal circuit in the Knock Sensor harness connector.

    Is there any voltage present? 

    Yes 

    1. Repair the (K42) KS Signal circuit for a short to voltage.
    2. Perform PCM VERIFICATION TEST .

    No 

    1. Go to  3).
  3. 3) (K42) KS SIGNAL CIRCUIT SHORTED TO GROUND 
    Fig 2: Measuring The Resistance Between Ground And The KS Signal Circuit In The Knock Sensor Harness Connector
    GC0049527Courtesy of CHRYSLER LLC

    Turn the ignition off.

    Measure the resistance between ground and the (K42) KS Signal circuit in the Knock Sensor harness connector.

    Is the resistance above 100 ohms? 

    Yes 

    1. Go to  4).

    No 

    1. Repair the (K42) KS Signal circuit for a short to ground.
    2. Perform PCM VERIFICATION TEST .
  4. 4) (K42) KS SIGNAL CIRCUIT SHORTED TO THE (K942) KS RETURN CIRCUIT 
    Fig 3: Measuring The Resistance Between The KS Signal Circuit And The KS Return Circuit In The Knock Sensor Harness Connector
    GC0049528Courtesy of CHRYSLER LLC

    Measure the resistance between the (K42) KS Signal circuit and the (K942) KS Return circuit in the Knock Sensor harness connector.

    Is the resistance above 100 ohms? 

    Yes 

    1. Go to  5).

    No 

    1. Repair the (K42) KS Signal circuit for a short to the (K942) KS Return circuit.
    2. Perform PCM VERIFICATION TEST .
  5. 5) (K42) KS SIGNAL CIRCUIT OPEN OR HIGH RESISTANCE 
    Fig 4: Measuring The Resistance Of The KS Signal Circuit Between The Knock Sensor Harness Connector And The Appropriate Terminal Of Special Tool #8815
    GC0049529Courtesy 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 (K42) KS Signal circuit between the Knock Sensor harness connector and the appropriate terminal of special tool #8815.

    Is the resistance below 5.0 ohms? 

    Yes 

    1. Go to  6).

    No 

    1. Repair the (K42) KS Signal circuit for an open circuit or high resistance.
    2. Perform PCM VERIFICATION TEST .
  6. 6) (K942) KS RETURN CIRCUIT OPEN OR HIGH RESISTANCE 
    Fig 5: Measuring The Resistance Of The KS Return Circuit Between The Knock Sensor Harness Connector And The Appropriate Terminal Of Special Tool #8815
    GC0049530Courtesy 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 (K942) KS Return circuit between the Knock Sensor harness connector and the appropriate terminal of special tool #8815.

    Is the resistance below 5.0 ohms? 

    Yes 

    1. Go to  7).

    No 

    1. Repair the (K942) KS Return for an open circuit or high resistance.
    2. Perform PCM VERIFICATION TEST .
  7. 7) KNOCK SENSOR 

    Turn the ignition off.

    Replace the Knock Sensor.

    Connect the Powertrain Control Module (PCM) connector.

    Turn the ignition on.

    With the scan tool, clear DTCs.

    Start the engine and allow it to reach normal operating temperature.

    WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts, or fan. Do not wear loose clothing. Failure to follow these instructions can result in personal injury or death.
    NOTE: It may be necessary to test drive the vehicle within the DTC monitoring conditions in order for this DTC to reset.

    With the scan tool, select View DTCs.

    Is the status Active for this DTC? 

    Yes 

    1. Go to  8).

    No 

    1. Test complete.
    2. Perform PCM VERIFICATION TEST .
  8. 8) POWERTRAIN CONTROL MODULE (PCM) 

    Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Knock Sensor 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.

    Refer to any Technical Service Bulletins that may apply.

    Were any problems found? 

    Yes 

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

    No 

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