## PGM-FI System

#### DTC Troubleshooting (cont'd)

11-69

DTC P0325: Malfunction in Knock Sensor Circuit

1. Reset the ECM (see page 11-4).

1. 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.

1. 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.

1. Turn the ignition switch OFF.

1. Disconnect the starter sub-harness 6P connector.

1. Check for continuity between ECM connector terminal A9 and body ground.

ECM CONNECTOR A (31P)

Wire side of female terminals

Is there continuity?

YES - Repair short in the wire between the ECM (A9) and the starter sub-harness 6P connector.

NO - Go to step 7.

1. Connect the starter sub-harness 6P connector terminal No. 5 to body ground with a jumper wire.

STARTER SUB-HARNESS 6P CONNECTOR

Wire side of female terminals

1. Check for continuity between body ground and ECM connector terminal A9.

ECM CONNECTOR A (31P)

Wire side of female terminals

Is there continuity?

YES - Go to step 9.

NO - Repair open in the wire between the ECM (A9) and the starter sub-harness 6P connector.

1. Check the starter sub-harness between 6P connector and the knock sensor for an open or short. If it is OK, substitute a known-good knock sensor and recheck.

   Is DTC P0325 indicated?

YES - Substitute a known-good ECM and recheck (see page 11-5). If symptom/indication goes away, replace the original ECM.

NO - Replace the original knock sensor and/or starter sub-harness.

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