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Home >> Jeep >> 2007 >> Wrangler Rubicon, Standard >> Repair and Diagnosis >> Engine Performance >> System >> DTCS P0203 To P0420 >> P0325-Knock Sensor 1 Circuit >> Diagnostic Test
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Diagnostic Test

  1. 1) ACTIVE DTC 

    Start the engine.

    Allow the engine to reach normal operating temperature.

    With a scan tool, select View DTCs.

    NOTE: It may be necessary to drive the vehicle to meet the conditions to set this DTC, try to repeat the conditions in which the fault originally set by reviewing the Freeze Frame data.

    Is the DTC Active or Pending at this time? 

    Yes 

    1. Go to  2).

    No 

    1. Refer to the INTERMITTENT CONDITION Diagnostic Procedure.
  2. 2) (K42) KS SIGNAL CIRCUIT SHORTED TO VOLTAGE 
    Fig 1: Measuring Voltage On (K42) KS Signal Circuit In Knock Sensor Harness Connector
    GC0056793Courtesy of CHRYSLER LLC

    Turn the ignition off.

    Disconnect the Knock Sensor harness connector.

    Disconnect the C2 PCM harness connector.

    Ignition on engine not running.

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

    Is there any voltage present? 

    Yes 

    1. Repair the short to voltage in the (K42) KS Signal circuit.
    2. Perform POWERTRAIN VERIFICATION TEST .

    No 

    1. Go to  3).
  3. 3) (K42) KS SIGNAL CIRCUIT OPEN 
    Fig 2: Measuring Resistance Of (K42) KS Signal Circuit From Knock Sensor Harness Connector To Appropriate Terminal Of Special Tool #8815
    GC0056794Courtesy of CHRYSLER LLC

    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 (K42) KS Signal circuit from the Knock Sensor harness connector to the appropriate terminal of special tool #8815.

    Is the resistance below 5.0 ohms? 

    Yes 

    1. Go to  4).

    No 

    1. Repair the open in the (K42) KS Signal circuit.
    2. Perform POWERTRAIN VERIFICATION TEST .
  4. 4) (K942) KS RETURN CIRCUIT OPEN 
    Fig 3: Measuring Resistance Of (K942) KS Return Circuit From Knock Sensor Harness Connector To Appropriate Terminal Of Special Tool #8815
    GC0056795Courtesy of CHRYSLER LLC

    Measure the resistance of the (K942) KS Return circuit from the Knock 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 (K942) KS Return circuit.
    2. Perform POWERTRAIN VERIFICATION TEST .
  5. 5) (K42) KS SIGNAL CIRCUIT SHORTED TO THE (K942) KS RETURN CIRCUIT 
    Fig 4: Measuring Resistance Between (K42) KS Signal Circuit And (K942) KS Return Circuit In Knock Sensor Harness Connector
    GC0056796Courtesy 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 below 100 ohms? 

    Yes 

    1. Repair the short between the (K42) KS Signal circuit and the (K942) KS Return circuit.
    2. Perform POWERTRAIN VERIFICATION TEST .

    No 

    1. Go to  6).
  6. 6) (K42) KS SIGNAL CIRCUIT SHORTED TO GROUND 
    Fig 5: Measuring Resistance Between Ground And (K42) KS Signal Circuit In Knock Sensor Harness Connector
    GC0056797Courtesy of CHRYSLER LLC

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

    Is the resistance below 100 ohms? 

    Yes 

    1. Repair the short to ground in the (K42) KS Signal circuit.
    2. Perform POWERTRAIN VERIFICATION TEST .

    No 

    1. Go to  7).
  7. 7) KNOCK SENSOR 1 

    Verify that there is good pin to terminal contact at the Knock Sensor and the Powertrain Control Module connectors.

    If no problems were found in the connectors, replace the Knock Sensor 1. Refer to REMOVAL .

    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 DTC Active at this time? 

    Yes 

    1. Go to  8).

    No 

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

    Turn the ignition off.

    Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Knock Sensor 1 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 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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