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.


  1. Turn the ignition switch OFF.
  2. Disconnect the knock sensor 3P connector.
  3. Turn the ignition switch ON (II).
  4. 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.


  1. 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.


  1. Turn the ignition switch OFF.
  2. Disconnect ECM/PCM connector A (31P).
  3. 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.