P0325-KNOCK SENSOR 1 CIRCUIT

For a complete wiring diagram Refer to Section 8W

When Monitored:
With the engine running, battery voltage greater than 10.4 volts, and no system voltages DTCs present. The low voltage diagnostic runs continuously. The high voltage diagnostic runs during engine closed throttle conditions.
Set Condition:
The PCM detects that the Knock Sensor input voltage is:
- above 4.0 volts
- less than or equal to 1.0 volt with engine RPM at or above 2200
- equal to 0.0 volts with engine RPM below 2200

Possible Causes

INTERMITTENT DTC

(K42) KS SIGNAL CIRCUIT SHORTED TO VOLTAGE

(K42) KS SIGNAL CIRCUIT SHORTED TO GROUND

(K42) KS SIGNAL CIRCUIT SHORTED TO (K942) KS RETURN

(K42) KS SIGNAL CIRCUIT OPEN OR HIGH RESISTANCE

(K942) KS RETURN CIRCUIT OPEN OR HIGH RESISTANCE

KNOCK SENSOR

POWERTRAIN CONTROL MODULE (PCM)

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE - STANDARD PROCEDUR)

Diagnostic Test

1.DTC IS ACTIVE

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 can result in personal injury or death.

NOTE: It may be necessary to test drive the vehicle within the DTC monitoring conditions in order for this DTC to reset.

Is the status Active for this DTC?

Yes

Go to 2

Refer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)

2.(K42) KS SIGNAL CIRCUIT SHORTED TO VOLTAGE

Is there any voltage present?

Yes

Repair the (K42) KS Signal circuit for a short to voltage.
Perform the PCM Verification Test Ver. 1 (Refer to 9 - ENGINE - STANDARD PROCEDUR).

Go to 3

3.(K42) KS SIGNAL CIRCUIT SHORTED TO GROUND

Is the resistance above 100 ohms?

Yes

Go to 4

Repair the (K42) KS Signal circuit for a short to ground.
Perform the PCM Verification Test Ver. 1 (Refer to 9 - ENGINE - STANDARD PROCEDUR).

4.(K42) KS SIGNAL CIRCUIT SHORTED TO (K942) KS RETURN CIRCUIT

Is the resistance above 100 ohms?

Yes

Go to 5

Repair the (K42) KS Signal circuit for a short to the (K942) KS Return circuit.
Perform the PCM Verification Test Ver. 1 (Refer to 9 - ENGINE - STANDARD PROCEDUR).

5.(K42) KS SIGNAL CIRCUIT OPEN OR HIGH RESISTANCE

Is the resistance below 5.0 ohms?

Yes

Go to 6

Repair the (K42) KS Signal circuit for an open circuit or high resistance.
Perform the PCM Verification Test Ver. 1 (Refer to 9 - ENGINE - STANDARD PROCEDUR).

6.(K942) KS RETURN CIRCUIT OPEN OR HIGH RESISTANCE

Is the resistance below 5.0 ohms?

Yes

Go to 7

Repair the (K942) KS Return for an open circuit or high resistance.
Perform the PCM Verification Test Ver. 1 (Refer to 9 - ENGINE - STANDARD PROCEDUR).

7.KNOCK SENSOR

Is status Active for this DTC?

Yes

Go to 8

Test Complete.
Perform the PCM Verification Test Ver. 1 (Refer to 9 - ENGINE - STANDARD PROCEDUR).

8.POWERTRAIN CONTROL MODULE (PCM)

Were any problems found?

Yes

Repair as necessary.
Perform the PCM Verification Test Ver. 1 (Refer to 9 - ENGINE - STANDARD PROCEDUR).

Replace and program the Powertrain Control Module (PCM) in accordance with the Service Information.
Perform the PCM Verification Test Ver. 1 (Refer to 9 - ENGINE - STANDARD PROCEDUR).