(P0325) Knock Sensor #1 Circuit Low

(P0325) KNOCK SENSOR #1 CIRCUIT LOW






When Monitored and Set Condition
^ When Monitored: With the Engine at operating temperature, engine speed greater than 2000 RPM, load greater than 40%, and Anti-Knock control not active.
^ Set Condition: Lower limit: Knock Sensor voltage is less than 0.10 volts. Upper limit: Knock Sensor voltage is greater than 4.98 volts.

POSSIBLE CAUSES
KNOCK SENSOR SIGNAL CIRCUIT OPEN
KNOCK SENSOR SIGNAL CIRCUIT SHORT TO GROUND
KNOCK SENSOR SIGNAL CIRCUIT SHORT TO VOLTAGE
SENSOR GROUND CIRCUIT OPEN
SENSOR GROUND CIRCUIT SHORTED TO GROUND
SENSOR GROUND CIRCUIT SHORTED TO VOLTAGE
KNOCK SENSOR
POWERTRAIN CONTROL MODULE

1. KNOCK SENSOR RESISTANCE





Turn the ignition off.
Disconnect PCM C3 harness connector.

Note: Check connectors-Clean/repair as necessary. Measure the resistance of the Knock Sensor.

Is the resistance between 4 - 5 mega ohms?
Yes>> Replace and program the Powertrain Control Module.
Perform Powertrain Verification Test - Ver 2
No>> Go To 2


2. KNOCK SENSOR SIGNAL CIRCUIT SHORTED TO GROUND





With the ignition off.
Measure the resistance between ground and the Knock Sensor Signal circuit.
Is resistance below 100 ohms?
Yes>> Repair the Knock Sensor Signal circuit for a short to
ground.
Perform Powertrain Verification Test - Ver 2
No>> Go To 3


3. SENSOR GROUND CIRCUIT SHORTED TO GROUND





With the ignition off.
Measure the resistance between ground and the Sensor Ground circuit.
Is resistance below 100 ohms?
Yes>> Repair the Sensor Ground circuit for a short to ground.
Perform Powertrain Verification Test - Ver 2
No>> Go To 4


4. SENSOR GROUND CIRCUIT SHORTED TO VOLTAGE





Turn the ignition on.
Measure the voltage of the Sensor Ground circuit at the PCM C3 harness
connector.
Is the voltage above 1.0 volt?
Yes>> Repair the Sensor Ground circuit for a short to voltage.
Perform Powertrain Verification Test - Ver 2
No>> Go To 5


5. KNOCK SENSOR SIGNAL CIRCUIT SHORTED TO VOLTAGE





With the ignition on.
Measure the voltage of the Knock Sensor Signal circuit at the PCM C3
harness connector.
Is the voltage above 1.0 volt?
Yes>> Repair the Knock Sensor Signal circuit for a short to voltage.
Perform Powertrain Verification Test - Ver 2
No>> Go To 6


6. OPEN KNOCK SENSOR SIGNAL CIRCUIT





Turn the ignition off. Disconnect Knock Sensor harness connector.

Note: Check connectors-Clean/repair as necessary. Measure the resistance of the Knock Sensor Signal circuit from the Knock Sensor harness connector to the PCM C3 harness connector.

Is the resistance below 5.0 ohms?
Yes>> Go To 7
No>> Repair the Knock Sensor Signal circuit for an open.
Perform Powertrain Verification Test - Ver 2


7. OPEN SENSOR GROUND CIRCUIT





With the ignition off.
Measure the resistance of the Sensor Ground circuit from the Knock Sensor harness connector to the PCM C3 harness connector.
Is the resistance below 5.0 ohms?
Yes>> Replace the Knock Sensor.
Perform Powertrain Verification Test - Ver 2
No>> Repair the Sensor Ground circuit for an open.
Perform Powertrain Verification Test - Ver 2