Possible Causes

GOOD TRIP EQUAL TO ZERO

(K42) KS SIGNAL CIRCUIT SHORTED TO VOLTAGE

(K42) KS SIGNAL 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

DIAGNOSTIC PROCEDURE - P0325-KNOCK SENSOR #1 CIRCUIT

TEST	ACTION
1	Ignition on, engine not running. With the DRBIII®, read DTCs and record the related Freeze Frame data. Is the Good Trip displayed and equal to zero? 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) KS Signal circuit in the Knock Sensor harness connector. Is the voltage above 2.0 volts? Yes --> Repair the short to voltage in the (K42) KS Signal circuit. Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC . No --> Go To 3
3	Turn the ignition off. Disconnect the Knock Sensor harness connector. Disconnect the PCM harness connector. Measure the resistance between ground and the (K42) KS Signal circuit at the Knock Sensor harness connector. Is the resistance below 100 ohms? Yes --> Repair the short to ground in the (K42) KS Signal circuit. Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC . No --> Go To 4
4	Turn the ignition off. Disconnect the Knock Sensor harness connector. Disconnect the PCM harness connector. 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 MILLER SPECIAL TOOL #8815 TO PERFORM DIAGNOSIS. Measure the resistance of the (K42) KS Signal circuit from the Knock Sensor harness connector to the appropriate terminal of special tool #8815. Is the resistance below 5.0 ohms? Yes --> Go To 5 No --> Repair the open in the (K42) KS Signal circuit. Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC .
5	Turn the ignition off. Disconnect the Knock Sensor harness connector. Measure the resistance between the (K42) KS Signal circuit and the (K45) KS Return circuit in the Knock Sensor harness connector. Is the resistance below 100 ohms? Yes --> Repair the (K42) KS Signal circuit for a short to (K45) KS Return circuit. Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC . No --> Go To 6
6	Turn the ignition off. Disconnect the Knock Sensor harness connector. Disconnect the PCM harness connector. 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 MILLER SPECIAL TOOL #8815 TO PERFORM DIAGNOSIS. Measure the resistance of the (K45) KS Return circuit from the Knock Sensor harness connector to the appropriate terminal of special tool #8815. Is the resistance below 5.0 ohms? Yes --> Go To 7 No --> Repair the open in the (K45) KS Return circuit. Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC .
7	Turn the ignition off. Replace the Knock Sensor. Ignition on, engine not running. With the DRBIII®, erase DTC. Attempt to operate the vehicle using the information noted in the Freeze Frame. With the DRBIII®, read DTC's. Does the DRBIII® display the DTC that was previously erased? Yes --> NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary. Replace and program the Powertrain Control Module in accordance with the Service Information. Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC . No --> Test Complete.