Diagnostic Aids

WARNING: This page is about a different car, the 2003 Toyota 4Runner. However, it is still accessible from the selected car via links, so may be relevant.

Using Toyota hand-held tester or scan tool, read FREEZE FRAME data. Freeze frame data records engine conditions when malfunction is detected. When ENGINE RUN TIME in freeze frame data is less than 200 seconds, check vapor pressure sensor.

NOTE: If DTCs related to MAF, IAT, TPS, ECT and/or HO2S are output simultaneously, the E2 sensor ground circuit at ECM 34-pin connector E4 terminal No. 2 (Brown wire) may be open. See appropriate WIRING DIAGRAM under ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article. For ECM electrical connector terminal identification, see Figure. It may be necessary to check intermediate connectors and ground point in circuit as well. Splice No. 18 is located behind passenger's side of instrument panel, above ECM. Intermediate connector "IE1" is located behind left kick panel. Ground connection "EF" is located on right side of left cylinder head.