Diagnostic Test

ACTIVE DTC
1. Start the engine.
2. Allow the engine to reach normal operating temperature.
3. With the 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
  - Go to step 2
  No
  - Perform the INTERMITTENT CONDITION diagnostic procedure. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
(K242) KNOCK SENSOR NO. 2 SIGNAL CIRCUIT SHORTED TO VOLTAGE

Fig 1: Checking Knock Sensor Signal Circuit
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Disconnect the No. 2 Knock Sensor harness connector.
3. Disconnect the C2 PCM harness connector.
4. Ignition on, engine not running.
5. Measure the voltage on the (K242) Knock Sensor No. 2 Signal circuit in the Knock Sensor harness connector.
  Is there any voltage present?
  
  Yes
  - Repair the short to battery voltage in the (K242) Knock Sensor No. 2 Signal circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
  No
  - Go to step 3
(K242) KNOCK SENSOR NO. 2 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 (K242) Knock Sensor No. 2 Signal 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 4
  No
  - Repair the open in the (K242) Knock Sensor No. 2 Signal circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
(K924) KNOCK SENSOR NO. 2 RETURN CIRCUIT OPEN

Fig 3: Checking Knock Sensor Return Circuit
Courtesy of CHRYSLER LLC
1. Measure the resistance of the (K924) Knock Sensor No. 2 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 (K924) Knock Sensor No. 2 Return circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
(K242) KNOCK SENSOR NO. 2 SIGNAL CIRCUIT SHORTED TO THE (K924) KNOCK SENSOR NO. 2 RETURN CIRCUIT

Fig 4: Checking Knock Sensor Signal Circuit
Courtesy of CHRYSLER LLC
1. Measure the resistance between the (K242) Knock Sensor No. 2 Signal circuit and the (K924) Knock Sensor No. 2 Return circuit in the Knock Sensor harness connector.
  Is the resistance below 100 Ohms?
  
  Yes
  - Repair the short between the (K242) Knock Sensor No. 2 Signal circuit and the (K924) Knock Sensor No. 2 Return circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
  No
  - Go to step 6
(K242) KNOCK SENSOR NO. 2 SIGNAL CIRCUIT SHORTED TO GROUND

Fig 5: Checking Knock Sensor Signal Circuit
Courtesy of CHRYSLER LLC
1. Measure the resistance between ground and the (K242) Knock Sensor No. 2 Signal circuit in the Knock Sensor harness connector.
  Is the resistance below 100 Ohms?
  
  Yes
  - Repair the short to ground in the (K242) Knock Sensor No. 2 Signal circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
  No
  - Go to step 7
KNOCK SENSOR 2
1. Turn the ignition off.
2. Replace the Knock Sensor 2.
3. Connect the Powertrain Control Module (PCM) connector.
4. Turn the ignition on.
5. With the scan tool, clear DTCs.
6. 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 possible serious or fatal injury.
  
  NOTE: It may be necessary to test drive the vehicle within the DTC monitoring conditions in order for this DTC to reset.
7. With the scan tool, select View DTCs.
  Is the DTC Active at this time?
  
  Yes
  - Go to step 8
  No
  - Test complete.
  - Perform the POWERTRAIN VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
POWERTRAIN CONTROL MODULE (PCM)
1. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Knock Sensor 2 and the Powertrain Control Module (PCM).
2. Look for any chafed, pierced, pinched or partially broken wires.
3. Look for broken, bent, pushed out or corroded terminals.
4. Perform any Technical Service Bulletins that may apply.
  Were any problems found?
  
  Yes
  - Repair as necessary.
  - Perform the POWERTRAIN VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
  No
  - 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 .