Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Diagnostic Test
- 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
- Go To 2.
No
- Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to INTERMITTENT CONDITION .
- (K242) KS SIGNAL 2 SHORTED TO VOLTAGE
- Turn the ignition off.
- Disconnect the No. 2 Knock Sensor harness connector.
- Disconnect the C2 PCM harness connector.
- Ignition on, engine not running.
- Measure the voltage on the (K242) KS Signal 2 circuit in the Knock Sensor harness connector.
Is there any voltage present?
Yes
- Repair the short to voltage in the (K242) KS Signal 2 circuit.
- Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
No
- Go To 3.
- (K242) KS SIGNAL 2 CIRCUIT OPEN Fig 2: Measuring Resistance Of Knock Sensor Signal Circuit From Knock Sensor Harness Connector To Appropriate Terminal Of PCM Pinout Box 8815
Courtesy 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 the PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position) to perform diagnosis.
- Measure the resistance of the (K242) KS Signal 2 circuit from the Knock Sensor harness connector to the appropriate terminal of special tool (special tool #8815A, Kit, NGC, 38 Position).
Is the resistance below 5.0 ohms?
Yes
- Go To 4.
No
- Repair the open in the (K242) KS Signal 2 circuit.
- Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
- Turn the ignition off.
- (K924) KS RETURN 2 CIRCUIT OPEN Fig 3: Measuring Resistance Of Knock Sensor Return Circuit From Knock Sensor Harness Connector To Appropriate Terminal Of PCM Pinout Box 8815
Courtesy of CHRYSLER LLC
- Measure the resistance of the (K924) KS Return 2 circuit from the Knock Sensor harness connector to the appropriate terminal of special tool (special tool #8815A, Kit, NGC, 38 Position).
Is the resistance below 5.0 ohms?
Yes
- Go To 5.
No
- Repair the open in the (K924) KS Return 2 circuit.
- Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
- Measure the resistance of the (K924) KS Return 2 circuit from the Knock Sensor harness connector to the appropriate terminal of special tool (special tool #8815A, Kit, NGC, 38 Position).
- (K242) KS SIGNAL 2 SHORTED TO THE (K924) KS RETURN 2 CIRCUIT Fig 4: Measuring Resistance Between Knock Sensor Signal Circuit And Knock Sensor Return Circuit In Knock Sensor Harness Connector
Courtesy of CHRYSLER LLC
- Measure the resistance between the (K242) KS Return 2 circuit and the (K924) KS Return 2 circuit in the Knock Sensor harness connector.
Is the resistance below 100 ohms?
Yes
- Repair the short between the (K242) KS Signal 2 circuit and the (K924) KS Return 2 circuit.
- Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
No
- Go To 6.
- Measure the resistance between the (K242) KS Return 2 circuit and the (K924) KS Return 2 circuit in the Knock Sensor harness connector.
- (K242) KS SIGNAL 2 SHORTED TO GROUND Fig 5: Measuring Resistance Between Ground And Knock Sensor Signal Circuit In Knock Sensor Harness Connector
Courtesy of CHRYSLER LLC
- Measure the resistance between ground and the (K242) KS Signal 2 circuit in the Knock Sensor harness connector.
Is the resistance below 100 ohms?
Yes
- Repair the short to ground in the (K242) KS Signal 2 circuit.
- Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
No
- Go To 7.
- Measure the resistance between ground and the (K242) KS Signal 2 circuit in the Knock Sensor harness connector.
- KNOCK SENSOR 2
- Turn the ignition off.
- Verify that there is good pin to terminal contact in the Knock Sensor and Powertrain Control Module connectors.
- If the connectors are OK, replace the Knock Sensor 2.
- 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 may result in possible serious or fatal injury.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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