P0327

DTC P0327 / P0328: Knock Sensor Circuit Low Input / High Input

Wiring Diagram





DTC Detecting Condition and Trouble Area






DTC Confirmation Procedure

1) Connect scan tool to DLC with ignition switch turned OFF.
2) Turn ON ignition switch and clear DTC, pending DTC and freeze frame data by using scan tool.
3) Start engine and run it for 10 sec.
4) Check DTC by using scan tool.

DTC Troubleshooting

1.
Was "Engine System Check" performed?
YES
Go to Step 2.
NO
Go to Engine System Check Engine System Check.

2. Check sensor circuit.

Disconnect connectors from ECM with ignition switch turned OFF.
Remove ECM from vehicle body and connect connectors to ECM.
Measure voltage between "C45-13" terminal in ECM connector and vehicle body ground with engine running.

Is voltage within 0.5 - 4.5 V?
YES
Intermittent trouble. Check for intermittent refer to Intermittent and Poor Connection Inspection.
If OK, substitute a known-good ECM and recheck.
NO
Go to Step 3.

3. Check sensor circuit for open.

Disconnect connector from knock sensor with ignition switch turned OFF.
Turn ON ignition switch, measure voltage between "RED" wire in knock sensor harness connector and engine ground.






Is voltage 4 - 5 V?
YES
Go to Step 6.
NO
Go to Step 4.

4. Check sensor circuit for open.

Turn ON ignition switch, measure voltage between "C45-13" wire in ECM harness connector and engine ground.

Is voltage 4 - 5 V?
YES
Go to Step 5.
NO
"RED" wire in open circuit

5. Check sensor circuit for short.

Disconnect connector from ECM with ignition switch turned OFF.
Measure resistance insulation between "C45-13" terminal in ECM harness connector and vehicle body ground.

Is resistance infinity?
YES
Go to Step 6.
NO
"RED" wire in shorted to ground circuit.
If wire is OK, substitute a known-good ECM and recheck

6. Check sensor circuit for short.

Turn ON ignition switch, measure voltage between "C45-13" terminal in ECM harness connector and vehicle body ground.

Is voltage 0 V?
YES
Go to Step 7.
NO
"RED" wire in shorted to others circuit.

7. Check sensor circuit for high resistance.

Measure resistance between "C45-13" terminal in ECM harness connector "RED" wire in knock sensor harness connector.

Is resistance below 5 ohms?
YES
Faulty knock sensor
NO
"RED" wire in high resistance circuit.