DTC P0325 (No.17): Knock Sensor Circuit Malfunction
Wiring Diagram
1. Knock sensor 2. ECM
DTC Detecting Condition and Trouble Area
DTC detecting condition Trouble area
Knock sensor voltage is 3.91 V or more
Knock sensor voltage is 1.23 V or less
“RED” circuit open or shorted to ground
Knock sensor malfunction
ECM malfunction
DTC Confirmation Procedure
1) Clear DTC, start engine and keep it at idle for 1 min.
2) Select “DTC” mode on scan tool and check DTC.
DTC Troubleshooting
Step Action YES NO
Was “Engine and Emission Control System Check” performed?
Go to Step 2.
Check knock sensor signal
1) With engine running, check voltage from “E115-25” terminal of ECM connector to body ground.
Is voltage about 1.23 – 3.91 V?
Intermittent trouble or faulty ECM.
Check for intermittent referring to Intermittent and Poor Connection Inspection .
Go to Step 3.
Check knock sensor output
1) Stop engine.
2) With ignition switch at OFF position, disconnect knock sensor connector.
3) With ignition switch at ON position, check voltage from “RED” wire terminal to body ground of knock sensor connector.
Is it 4 – 5 V?
Faulty knock sensor. Substitute a known-good knock sensor and recheck.
“RED” wire open, shorted to ground circuit or poor “E112-25” connection.
If wire and connection are OK, substitute a known-good ECM and recheck.