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Diagnosis & Repair

WARNING: This page is about a different car, the 2002 Lexus RX 300. However, it is still accessible from the selected car via links, so may be relevant.
  1. Connect scan tool to Data Link Connector (DLC) No. 3. See Fig 1. Disconnect EA1 connector. EA1 connector is a wire-to-wire connector located in engine compartment, near idle air control valve. Connector is a Dark Gray 4-pin connector.
  2. Connect a fused jumper wire between terminal No. 1 of male connector to terminal No. 2 of female connector. Connect another fused jumper wire between terminal No. 2 of male connector to terminal No. 1 of female connector. See Fig 1. Turn ignition on. Turn scan tool on. Start and warm engine to normal operating temperature.
  3. Snap accelerate engine 3 times to 4000 RPM. Retrieve trouble codes. See RETRIEVING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. If same code is repeated as before, go to next step. If code has changed, go to step  5.
  4. Check for open or short circuit(s) between EA1 connector and ECM harness connector. See WIRING DIAGRAMS article. Repair as necessary. If circuits are okay, replace ECM and retest system.
  5. Check for open or short circuit(s) between EA1 connector and suspect knock sensor. If DTC P0325 has changed to DTC P0330, check knock sensor circuit on right bank. If DTC P0330 changed to DTC P0325, check knock sensor circuit on left bank. Repair as necessary. If harness is okay, replace knock sensor.
Fig 1: Testing Knock Sensors At EA1 Connector
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