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.

NOTE: If DTCs related to MAF, IAT, TPS, ECT and/or VPS 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.

This DTC uses two-trip detection logic. Use Toyota hand-held tester or scan tool to access DATA LIST to read output voltage for oxygen sensor. Heated oxygen sensor output alternates between less than 0.4 volt and more than 0.55 volt. It is impossible to confirm oxygen sensor output voltage without using Toyota hand-held tester or scan tool. Oxygen sensor output voltage on scan tool is displayed at one fifth the voltage of that displayed on a Toyota hand-held tester. Using hand-held tester or scan tool, read FREEZE FRAME data. Freeze frame data records engine conditions when malfunction is detected.