## PGM-FI System

#### DTC Troubleshooting (cont'd)

11-385

DTC P0325: Knock Sensor Circuit Malfunction

1. Reset the ECM/PCM (see page 11-312).
2. Start the engine. Hold the engine at 3,000 rpm (min-1) with no load (in Park or neutral) until the radiator fan comes on, then let it idle.
3. Hold the engine at 3,000-4,000 rpm (min-1) for at least 60 seconds.

Is DTC P0325 indicated?

YES | - Go to step 4.
NO | - Intermittent failure, system is OK at this time. Check for poor connections or loose wires at the knock sensor and at the ECM/PCM.

4. Turn the ignition switch OFF.
5. Disconnect the knock sensor 3P connector.
6. Turn the ignition switch ON (II).
7. Measure voltage between knock sensor 3P connector terminal No. 1 and body ground.

KNOCK SENSOR 3P CONNECTOR

Wire side of female terminals

Is there about 5 V?

YES | - Go to step 12.
NO | - Go to step 8.

8. Measure voltage between ECM/PCM connector terminal A9 and body ground.

ECM/PCM CONNECTOR A (31P)

Wire side of female terminals

Is there about 5 V?

YES | - Repair open in the wire between the ECM/PCM (A9) and knock sensor.
NO | - Go to step 9.

9. Turn the ignition switch OFF.
10. Disconnect ECM/PCM connector A (31P).
11. Check for continuity between ECM/PCM connector terminal A9 and body ground.

ECM/PCM CONNECTOR A (31P)

Wire side of female terminals

Is there about 5 V?

YES | - Repair short in the wire between ECM/PCM (A9) and knock sensor.
NO | - Substitute a known-good ECM/PCM and recheck (see page 11-313). If symptom/indication goes away, replace the original ECM/PCM.