Diagnostic Test

WARNING: This page is about a different car, the 2011 RAM Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.

ACTIVE DTC
1. 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 may 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.
2. With the scan tool, select View DTCs.
  Is the DTC Active or Pending at this time?
  
  Yes
  - Go To 2.
  No
  - Perform the INTERMITTENT CONDITION Diagnostic Procedure. Refer to INTERMITTENT CONDITION .
(K42) KNOCK SENSOR NO. 1 SIGNAL SHORTED TO VOLTAGE

Fig 1: Measuring Voltage On Knock Sensor Signal Circuit In Knock Sensor Harness Connector
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Disconnect the Knock Sensor harness connector.
3. Disconnect the C2 PCM harness connector.
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.
  Is there any voltage present?
  
  Yes
  - Repair the short to voltage in the (K42) Knock Sensor No. 1 Signal circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 3.
(K42) KNOCK SENSOR NO. 1 SIGNAL CIRCUIT OPEN

Fig 2: Measuring Resistance Of (K42) Knock Sensor No. 1 Signal Circuit From Knock Sensor Harness Connector To Appropriate Terminal Of PCM Pinout Box 8815
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 the PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position) 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 PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position).
  Is the resistance below 5.0 Ohms?
  
  Yes
  - Go To 4.
  No
  - Repair the open in the (K42) Knock Sensor No. 1 Signal circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
(K942) KNOCK SENSOR NO. 1 RETURN CIRCUIT OPEN

Fig 3: Measuring Resistance Of (K942) Knock Sensor No. 1 Return Circuit From Knock Sensor Harness Connector To Appropriate Terminal Of PCM Pinout Box 8815
Courtesy of CHRYSLER LLC
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 (special tool #8815A, Kit, NGC, 38 Position).
  Is the resistance below 5.0 Ohms?
  
  Yes
  - Go To 5.
  No
  - Repair the open in the (K942) Knock Sensor No. 1 Return circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
(K42) KNOCK SENSOR NO. 1 SIGNAL SHORTED TO THE (K942) KNOCK SENSOR NO. 1 RETURN CIRCUIT

Fig 4: Measuring Resistance Between Knock Sensor Signal Circuit And Return Circuit In Knock Sensor Harness Connector
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. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 6.
(K42) KNOCK SENSOR NO. 1 SIGNAL SHORTED TO GROUND

Fig 5: Measuring Resistance Between Ground And Knock Sensor Signal Circuit In Knock Sensor Harness Connector
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. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 7.
KNOCK SENSOR 1
1. Turn the ignition off.
2. Verify that there is good pin to terminal contact at the Knock Sensor and the Powertrain Control Module connectors.
3. If no problems were found in the connectors, replace the Knock Sensor 1.
4. Connect the Powertrain Control Module (PCM) harness connector.
5. Turn the ignition on.
6. With the scan tool, clear DTCs.
7. 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 may 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.
8. With the scan tool, select View DTCs.
  Did the status of this DTC change to Active?
  
  Yes
  - Go To 8.
  No
  - Test complete.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
POWERTRAIN CONTROL MODULE (PCM)
1. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Knock Sensor 1 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. Refer to any Technical Service Bulletins that may apply.
  Were any problems found?
  
  Yes
  - Repair as necessary.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Replace and program the Powertrain Control Module (PCM) in accordance with the Service Information.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .