Symptom:
P0325-KNOCK SENSOR #1 CIRCUIT
When Monitored and Set Condition:
P0325-KNOCK SENSOR #1 CIRCUIT
When Monitored: With the ignition on and the engine running.
Set Condition: The Knock Sensor circuit voltage falls below a minimum value. The
minimum value is from a look-up table internal to the PCM and is based on engine rpm.
DTC also sets if sensor output is approx 5.0 volts and the engine is running within idle
range. One Trip Fault.
POSSIBLE CAUSES
GOOD TRIP EQUAL TO ZERO
KNOCK SENSOR CIRCUIT SHORTED TO VOLTAGE
KNOCK SENSOR CIRCUIT SHORTED TO GROUND
(K42) KS SIGNAL CIRCUIT OPEN
(K42) KS SIGNAL CIRCUIT SHORTED TO (K45) KS RETURN CIRCUIT
(K45) KS RETURN CIRCUIT OPEN
KNOCK SENSOR
TEST ACTION APPLICABILITY
1 Ignition on, engine not running.
With the DRBIIIt, read DTCs and record the related Freeze Frame data.
Is the Good Trip displayed and equal to zero?
All
Yes → Go To 2
No → Refer to the INTERMITTENT CONDITION symptom in the
Driveability category.
Perform POWERTRAIN VERIFICATION TEST VER-5-NGC.
2 Turn the ignition off.
Disconnect the Knock Sensor harness connector.
Measure the voltage of the (K42) Knock Sensor Signal circuit and the (K45) Knock
Sensor Return circuit in the Knock Sensor harness connector.
Is the voltage above 2.0 volts on either circuit?
All
Yes → Repair the short to voltage in the Knock Sensor circuit.
Perform POWERTRAIN VERIFICATION TEST VER-5-NGC.
No → Go To 3
132
DRIVEABILITY - NGC
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