Diagnosis & Repair
WARNING: This page is about a different car, the 2002 Lexus LX 470. However, it is still accessible from the selected car via links, so may be relevant.
- Connect scan tool to Data Link Connector (DLC) No. 3. See Figure. Disconnect EC1 Black 3-pin connector. EC1 connector is a wire-to-wire connector located at center rear of engine. Using a fused jumper wire, connect terminal No. 3 (White wire) on male part of connector to terminal No. 2 (Black wire) on female part of connector. Connect another jumper wire between terminal No. 2 (Black wire) on male part of connector to terminal No. 3 (White wire) on female part of connector. See Fig 1. Turn ignition on. Clear DTCs. Start and warm engine to normal operating temperature. Snap accelerate engine to about 4000 RPM 3 times. Retrieve DTCs. If same DTC is repeated, go to next step. If DTC changed, go to step 3.
- Check for open or short in wiring between EC1 connector and ECM. If problem exists, repair wiring as necessary. If problem does not exist, replace ECM.
- If DTC P0325 changed to P0330, check knock sensor circuit on right bank. If DTC P0330 changed to P0325, check knock sensor circuit on left bank. Check for open or short in wiring between EC1 connector and knock sensor(s). To access harness, it may be necessary to remove intake manifold. See REMOVAL, OVERHAUL & INSTALLATION article. If problem exists, repair wiring as necessary. If problem does not exist, replace knock sensor.