Diagnostic Test

ACTIVE DTC
1. Ignition on, engine not running.
2. With a scan tool, read DTCs.
  Is the DTC active at this time?
  
  Yes
  - Go to step 2
  No
  - Perform the INTERMITTENT CONDITION diagnostic procedure. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
(K42) KNOCK SENSOR NO. 1 SIGNAL SHORTED TO BATTERY VOLTAGE

Fig 1: Checking Knock Sensor Signal Circuit
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Disconnect the No. 1 Knock Sensor harness connector.
3. Disconnect the PCM harness connectors.
4. Ignition on, engine not running.
5. Measure the voltage on the (K42) Knock Sensor No. 1 Signal circuit in the Knock Sensor harness connector.
  Does the voltmeter indicate voltage present?
  
  Yes
  - Repair the short to battery voltage in the (K42) Knock Sensor No. 1 Signal circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
  No
  - Go to step 3
(K42) KNOCK SENSOR NO. 1 SIGNAL CIRCUIT OPEN

Fig 2: Checking Knock Sensor Signal Circuit
Courtesy of CHRYSLER LLC
1. 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 PCM Pinout Box 8815 to perform diagnosis.
2. Measure the resistance of the (K42) Knock Sensor No. 1 Signal circuit from the Knock Sensor harness connector to the appropriate terminal of the PCM Pinout Box 8815.
  Is the resistance below 5.0 Ohms?
  
  Yes
  - Go to step 4
  No
  - Repair the open in the (K42) Knock Sensor No. 1 Signal circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
(K942) KNOCK SENSOR NO. 1 RETURN CIRCUIT OPEN
1. Measure the resistance of the (K942) Knock Sensor No. 1 Return circuit from the Knock Sensor harness connector to the appropriate terminal of PCM Pinout Box 8815.
  Is the resistance below 5.0 Ohms?
  
  Yes
  - Go to step 5
  No
  - Repair the open in the (K942) Knock Sensor No. 1 Return circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
(K42) KNOCK SENSOR NO. 1 SIGNAL SHORTED TO THE (K942) KNOCK SENSOR NO. 1 RETURN CIRCUIT

Fig 3: Checking Knock Sensor Signal Circuit
Courtesy of CHRYSLER LLC
1. Measure the resistance between the (K42) Knock Sensor No. 1 Signal circuit and the (K942) Knock Sensor No. 1 Return circuit in the Knock Sensor harness connector.
  Is the resistance below 100 Ohms?
  
  Yes
  - Repair the short between the (K42) Knock Sensor No. 1 Signal circuit and the (K942) Knock Sensor No. 1 Return circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
  No
  - Go to step 6
(K42) KNOCK SENSOR NO. 1 SIGNAL SHORTED TO GROUND

Fig 4: Checking Knock Sensor Signal Circuit
Courtesy of CHRYSLER LLC
1. Measure the resistance between ground and the (K42) Knock Sensor No. 1 Signal circuit in the Knock Sensor harness connector.
  Is the resistance below 100 Ohms?
  
  Yes
  - Repair the short to ground in the (K42) Knock Sensor No. 1 Signal circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
  No
  - Go to step 7
KNOCK SENSOR
1. Replace the Knock Sensor.
2. Ignition on, engine not running.
3. With the scan tool, erase DTC.
4. Attempt to operate the vehicle using the information noted in the Freeze Frame.
5. With the scan tool, read DTCs.
  Does the scan tool display the DTC that was previously erased?
  
  Yes
  - Replace and program the Powertrain Control Module (PCM) in accordance with the Service Information.
  - Perform the POWERTRAIN VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
  No
  - Test Complete.