Technical Definition:

Crankshaft Position (CKP) (Sensor A) Circuit Intermittent

Technical Description:

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Possible Symptoms:

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Technical Definition:

Crankshaft Position (CKP) (Sensor A) Circuit High

Technical Description:

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Technical Definition:

Knock (Sensor 2) Circuit High (Bank 2)

Technical Description:

Knock sensors are used to detect engine pre-detonation.

Possible Causes:

• Knock sensor connector is damaged
• Knock sensor circuit is open or shorted to ground
• Knock sensor circuit is shorted to voltage
• Knock sensor has failed
• Loose knock sensor
• Electrical interference in circuit
• Low fuel pressure
• Incorrect fuel octane
• Mechanical engine problem
• Failed/faulty PCM

Possible Symptoms:

• MIL (Malfunction Indicator Lamp) illumination
• Audible knocking from the engine compartment
• Pinging from engine under acceleration
• Loss of power
• Irregular RPM

Knock Sensor 2 Circuit High Input Bank 2

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

– Faulty knock sensor
– Knock sensor circuit poor electrical connection
– Knock sensor harness is open or shorted
– Faulty Engine Control Module (ECM)

Specific Makes:

– Possible Lack/Loss of Power

Technical Definition:

Knock (Sensor 2) Circuit Intermittent (Bank 2)

Technical Description:

Possible Causes:

Possible Symptoms:

Knock Sensor 2 Circuit Intermittent Bank 2

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

– Faulty knock sensor
– Knock sensor circuit poor electrical connection
– Knock sensor harness is open or shorted
– Faulty Engine Control Module (ECM)

Specific Makes:

– Possible Lack/Loss of Power

Technical Definition:

Crankshaft Position (CKP) (Sensor A) Circuit Malfunction

Technical Description:

The crankshaft position sensor (CKP) measures crankshaft location and relays this information to the PCM (Powertrain Control Module).

Possible Causes:

• Damaged CKP sensor connector
• Damaged reluctor ring (missing teeth or not turning due to sheared-off keyway)
• Sensor output open
• Sensor output shorted to ground
• Sensor output shorted to voltage
• Failed crank sensor
• Broken timing belt
• Failed PCM

Possible Symptoms:

• Vehicle may not start (see above)
• Vehicle may run rough or misfire
• MIL illumination

Possible Solutions:

OBD-II Trouble Code Type:

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Technical Definition:

Crankshaft Position (CKP) (Sensor A) Circuit Range / Performance

Technical Description:

Possible Causes:

• Bad crank sensor
• Broken reluctor ring (missing teeth, debris lodged in ring)
• Reluctor ring dislodged/stripped from it’s stationary location
• Wiring harness chafing causing short
• Wiring open in CKP circuit

Possible Symptoms:

• Intermittent stalling & no start
• No start
• MIL (Malfunction Indicator Lamp) illumination
• Intermittent misfire

Possible Solutions:

OBD-II Trouble Code Type:

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Technical Definition:

Crankshaft Position (CKP) (Sensor A) Circuit Low

Technical Description:

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Technical Definition:

Knock (Sensor 2) Circuit (Bank 2)

Technical Description:

Possible Causes:

• The “B” knock sensor is faulty and needs to be replaced
• There is a wiring short/fault in the knock sensor circuit

Possible Symptoms:

Knock Sensor 2 Circuit Malfunction Bank 2

Possible Solutions:

• Check the resistance of the knock sensor on bank 2 (compare it to factory specs)
• Check for broken/frayed wires leading to the sensor
• Replace the knock sensor on bank 2

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

– Faulty knock sensor
– Knock sensor circuit poor electrical connection
– Knock sensor harness is open or shorted
– Faulty Engine Control Module (ECM)

Specific Makes:

– Possible Lack/Loss of Power

Technical Definition:

Knock (Sensor 2) Circuit Range / Performance (Bank 2)

Technical Description:

Possible Causes:

• Knock sensor (KS) connector is damaged
• Knock sensor circuit is open or shorted to ground
• Knock sensor circuit is shorted to voltage
• Knock sensor has failed
• Moisture in knock sensor connectors
• Incorrect fuel octane
• PCM has failed

Possible Symptoms:

• MIL (Malfunction Indicator Lamp) illumination
• Audible knocking from the engine compartment
• Pinging from engine under acceleration

Knock Sensor 2 Circuit Range/Performance Bank 2

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

– Faulty knock sensor
– Knock sensor circuit poor electrical connection
– Knock sensor harness is open or shorted
– Faulty Engine Control Module (ECM)

Specific Makes:

– Possible Lack/Loss of Power

Technical Definition:

Knock (Sensor 2) Circuit Low (Bank 2)

Technical Description:

A knock sensor tells the engine computer when one or more of your engine’s cylinders are “knocking”, that is, exploding the air/fuel mixture in a way that delivers less power and can be damaging to the engine if prolonged.

Possible Causes:

• The knock sensor is faulty and needs to be replaced
• There is a wiring open/short/fault in the knock sensor circuit
• The PCM/ECM has failed

Possible Symptoms:

Knock Sensor 2 Circuit Low Input Bank 2

Possible Solutions:

• Verify the resistance of the knock sensor (compare it to factory specs)
• Inspect for broken/frayed wires leading to the sensor
• Check the wiring and connections leading to/from the knock sensor and PCM/ECM
• Verify proper voltage is reaching the knock sensor (e.g. 5 volts)
• Verify proper grounding of sensor and circuit
• Replace the knock sensor
• Replace the PCM/ECM

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

– Faulty knock sensor
– Knock sensor circuit poor electrical connection
– Knock sensor harness is open or shorted
– Faulty Engine Control Module (ECM)

Specific Makes:

– Possible Lack/Loss of Power

Technical Definition:

Knock Sensor 1) Circuit High (Bank 1 or Single Sensor

Technical Description:

Knock sensors are used to detect engine pre-detonation (engine knock or ping). The knock sensor (KS) is usually a two wire sensor. A 5 volt reference is supplied to the sensor and there is a signal return from the knock sensor to the PCM (powertrain control module).

Possible Causes:

• Knock sensor connector is damaged
• Knock sensor circuit is open or shorted to ground
• Knock sensor circuit is shorted to voltage
• Knock sensor has failed
• Loose knock sensor
• Electrical interference in circuit
• Low fuel pressure
• Incorrect fuel octane
• Mechanical engine problem
• Failed/faulty PCM

Possible Symptoms:

• MIL (Malfunction Indicator Lamp) illumination
• Audible knocking from the engine compartment
• Pinging from engine under acceleration
• Loss of power
• Irregular RPM

Knock Sensor Circuit High Input

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

– Faulty knock sensor
– Knock sensor circuit poor electrical connection
– Knock sensor harness is open or shorted
– Faulty Engine Control Module (ECM)

Specific Makes:

– Possible Lack/Loss of Power

Technical Definition:

Knock Sensor 1) Circuit Intermittent (Bank 1 or Single Sensor

Technical Description:

Possible Causes:

Possible Symptoms:

Knock Sensor Circuit Intermittent

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

– Faulty knock sensor
– Knock sensor circuit poor electrical connection
– Knock sensor harness is open or shorted
– Faulty Engine Control Module (ECM)

Specific Makes:

– Possible Lack/Loss of Power