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

    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

    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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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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How can I test if the ecu computer needs to be replaced on a 1992 corolla? The car starts but only runs for a second or so.

You won't be able to 100% test the ECU yourself. Carry out all the checks and you will end up with a balance of probabilities.

The ECU can't output signals unless it is receiving proper inputs and has a good supply and ground, sometimes several of each.

If the car has an immobiliser it is something else to check and possibly worry about because if it isn't disarming it will seem as if the ECU is dead. Mainstream manufacturers were fitting a PATS system to some of their products by 1992.

You need a wiring diagram and some decent test gear to check the continuity of every wire that could be suspect, check every voltage, check every ground, every sensor - it is a long tedious process. Checking the inputs and outputs of the ECU with an oscilloscope helps.

From your description, if I had to guess, I would suggest the signal from the distributor or crank/camshaft sensor is being lost.

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the ECU is the engine control unit .i think you may have a typo with "tyhem", what is the vehicle,age ,model , if after 1996 get the OBD codes read as should give an indication of what circuit is at issue, it may just need new coil let me know how you get on

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this will most likely to be a signal from one of the ABS sensors not in the correct range , it could just be a worn wire , and the signal to the ECU isn't making the correct adjustment/reading , will need to be checked by a auto electrician as they will know the correct procedure to trace the fault as you could spend hours searching and not find anything, do the brakes feel like they are operating correctly? if not i'd have this seen to as soon as possible

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check fuses under the hood esp the radio then make sure you connected the jumper wire correctly sorry dont pull the radio fuse if your trying to read codes it will clear the codes once you get your codes pull the radio to clear them good luck

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I'm getting 3 codes on my ECU 21-33-51 . I have replaced my ECU , replaced all injectors and oxygen heat sensor. The new ECU is showing the same codes.

Hi Kevin, The fault codes are in relation to faults that are recorded with the management system of the vehicle, and need not be the actual faults recorded. For example, the fault read out may display 'rich mixture.' That however does not mean that the injectors are leaking, but instead, the oxygen sensor may be giving and incorrect reading and is allowing too much fuel to be injected. Have a diagnosis carried out and then the diagnostic report must be interpreted by some one who knows what they are reading!Regards Johngee10

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1992 jaguar vandreplas in limpe mode

This is caused usually by either multiple fault codes triggered or one(s) of a serious nature.You will need to make contact with a garage or dealer that can successfully read these and hopefully clear them.Any that don't clear will need repair in those areas,others that cleared should at least be inspected for obvious signs of fault,or make note of for later in case they return.Sometimes the fault can be in the ECU or the loom to it.check for dampness around it and poor connection in ecu loom plugs and its earth.I hope that this is of some help to you in getting to the source and repair.

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Need to find obd in 1990 honda accord

TROUBLE CODES System Diagnosis READING CODES When the "Check Engine'' warning light on the dashboard comes on and stays on, it indicates a problem in the fuel injection/emissions system. Check the ECU for fault codes. On certain models, some codes will not trigger the check engine light; if driveability has suffered, check for stored fault codes. The most common error when using fault codes is to assume the indicated component has failed rather than checking the entire circuit. The presence of a trouble code means simply that the electrical circuit for the named component is not functioning properly. For example, a code for the oxygen sensor circuit does not automatically mean the oxygen sensor has failed. A wire terminal may simply be loose or corroded at the connector. When using diagnostic or fault codes, always remember that the entire circuit including the component must be checked carefully. On 1990-95 Accord (except V-6) and 1992-95 Prelude, the codes are read from the check engine light after the two-wire service connector has been jumpered. On Accords, the service connector is under the dash on the passenger side. On Preludes, it is located behind the center console. Codes 1 through 9 are indicated by a series of short flashes; two-digit codes use a long flash for the first digit followed by the appropriate number of short flashes. For example, Code 14 would be indicated by 1 long flash followed by 4 short flashes. Codes are separated by a pause between displays. Multiple codes are transmitted in an alternating pattern. For example, a code 3 and 14 would be displayed as 3 short flashes (for Code 3) followed by the separator pause, then 1 long flash and 4 short flashes (for Code 14). Fig. 7: Fault codes are read from the check engine light on most late-model vehicles 86804048.gif
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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