Diagnosis & Repair
WARNING: This page is about a different car, the 2002 Lexus ES 300. 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 EB1 connector. EB1 connector is an in-line harness connector located on left bank of cylinder head. EB1 connector is a 4-pin, Dark Gray connector. Remove, switch and install terminals No. 1 and 2 from male connector. See Fig 1. Connect EB1 connector. 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 EB1 connector and ECM. If problem exists, repair wiring as necessary. If problem does not exist, replace ECM. Ensure EB1 male connector terminals are returned to their original position.
- Check for open or short in wiring between EB1 connector and knock sensor(s). To access harness, it may be necessary to remove intake manifold. See KNOCK SENSOR under ENGINE SENSORS & SWITCHES in REMOVAL, OVERHAUL & INSTALLATION article. If problem exists, repair wiring as necessary. If problem does not exist, replace knock sensor. Ensure EC1 male connector terminals are returned to their original position.
NOTE:
If DTC P0325 changed to DTC P0330, check knock sensor circuit on right bank. If DTC P0330 changed to P0325, check knock sensor circuit on left bank.