Question about 1992 Toyota Xtracab

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How to properly check fault codes on 1992 V6 4x4 P/U

I need to know the correct process for reading the ECU fault codes on my new 1992 V6. It just came on today.

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  • robbysherwin Nov 20, 2008

    Ed,
    Sorry. Meant to say that my dash Check Engine light came on. My bad. Tried the paperclip E1 and Te1 and nothing happened. Anything else I can do????


  • robbysherwin Nov 21, 2008

    Ed,
    Got it. Finally. Had to clean off the ODB box (or whatever you call it). It was nasty gunked up. I'm reading a 25. What can I do to fix this?


  • Toyota Ed May 11, 2010

    You are jumping terminals Te1 and E1, in the small box, under the hood? You have to have the key on BEFORE you jump the terminals. You may have to "jiggle" the paperclip a bit, as there my be some greasy substances in the terminals, to get a proper contact between the 2 terminals. In any case, keep moving the paperclip until the check engine light on your dash begins to blink on & off. The Te1 and E1 is the only way to extract codes without a scan tool.

  • Toyota Ed May 11, 2010

    Under the hood, with the key ON, locate the small grey box with several female terminals.

    Jump the following terminals with a small paperclip: E1 and Te1

    Observe the now-flashing check engine light, count the flashes.

    2 flashes/pause/5 flashes would be code 25.

    Get the code back to me for more assistance.

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  • Toyota Master
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Code 25 equates to a problem with the "heated" oxygen sensor. The code is "Air-Fuel Ratio Lean", from the heated O2 sensor...This is the one with more than one wire. I'd replace it. But, you would do much better if you get a genuine Toyota part. I have observed that the "aftermarket" sensors do not develop the proper VDC (.045; for 90 seconds). New ones from the aftermarket do not fix this at times. Hope this helps, and thnaks for choosing FixYa. The graciousness of a FixYa rating for my assistance would be greatly appreciated. Thanks.

Posted on Nov 21, 2008

  • Toyota Ed Nov 21, 2008

    Thanks for the FixYa! Much Appreciated!

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Fig. 8: On Accords, the service connector is located under the dash on the passenger side 86804049.gif
Fig. 9: The service connector on Preludes is located behind the center console 86804050.gif
  1. Use a jumper wire to connect the two terminals of the service connector together.
  2. Turn the ignition switch ON; the check engine light will display any stored codes by rhythmic flashing. NOTE: In the event that a code is encountered which is not on the chart, re-count the number of flashes. If the code is truly wrong, it will be necessary to swap the ECU for a known-good unit and recheck. Since this can be expensive, you may wish to bring the car to a reputable repair facility if no other cause of the failure can be found. This may save you the expense of purchasing an unnecessary part.
  3. If no codes are displayed but a driveablity problem exits, testing of the system individual components is necessary to find the problem. If codes are displayed, follow the appropriate troubleshooting chart in this section. Fig. 10: Fault code chart for 1990-93 Accords 86804051.gif
    Fig. 11: Fault code chart for 1994-95 Accords (four cylinder) 86804052.gif
    Fig. 12: Fault code chart for 1992-95 Preludes 86804053.gif

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