Question about 1997 Honda Odyssey

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I am using used honda odyssey model 1997, imported from Japan since 2000. Recently I have an electrical problem, The 10 amp ECU fuse blow frequently especially in long distance travel. When the engine warm it blow immediately upon replacement. What could be the cause, kindly please advice!

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  • sanusi1955 Sep 12, 2010

    The problem arises only recently when I travel in the afternoon in hot days. Recently I travel for 350km starting at 4.30am until 9am without any problem.

  • sanusi1955 Sep 12, 2010

    I have resonably good knowledge on car and hands on on some problem. Therefore I need real expert advice. If the advice is to take my car to repair shop I dont need to ask FixYa, even the most dumb person know that. So please give expert advice, I the wiring diagram of odyssey 1997. Fuse blow is caused by current overloading, I want to know what cause the overloading.

  • sanusi1955 Sep 13, 2010

    I check the wiring diagram the 10amp ECU fuse is connected to PGM-Fi relay not directly to iac or egr. What is your advice?

  • sanusi1955 Sep 13, 2010

    Where do I find the PGM-Fi main relay, where is located? How do I test the relay?

  • sanusi1955 Sep 14, 2010

    I think the short circuit is severe because it happens immediately, not like 2 days ago the fuse blew after travelling some distance. According to the circuit diagram, the 10amp ECU fuse is connected to PGM-FI relay, when the contact close it send current to iac solenoid valve. I have isolated the iac solenoid valve by unplugging the socket, however when I crank the engine the ECU fuse blow again. Could you think of other reasons? I am still not sure which one is the PGM-FI relay.


    I tested the ECU fuse terminals, one end is live, fine, because it is connected to the battery. I tested the other end using multitester, it shows it is connected to the ground (body). Is it normal or is it a sign of short circuit?

  • sanusi1955 Sep 14, 2010

    I believe the proper way is by refering to the circuit diagram not by guessing, this way we could check those supplied by the ECU fuse one by one and eliminate those not getting the supply. My problem is I found few relays under the driver's seat dashborad but I dont know their names.

  • sanusi1955 Sep 14, 2010

    According to circuit diagram the PGM-FI main relay is located at Upper Left Kick Panel. I dont understand where the kick panel, where is it in the car?

  • sanusi1955 Sep 14, 2010

    Thank you Kapishtech, very informative. I have been struggling the whole day trying to detect the short circuit, I will try your guidance tomorrow. Thanks again.

  • sanusi1955 Sep 15, 2010

    Ok, the O2 warning light at the dashboard was on recently, I will get both of them change. Thank you.

  • sanusi1955 Sep 26, 2010

    I managed to get to the PGM-FI relay, get it replaced and the fuse did not blow again. I have also replaced the O2 sensor and the catalytic converter sensor, then the red warning light on the dashboard disappeared. The problem is solved. Thank you to all the advisors.

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Hi! The fault could be on the ECU itself. The ECU may have internal short circuit that makes the fuse blow when the engine is heated. Please try swapping the ECU and this may resolve the problem. HOpe this helps and thank you for using FixYa!

Posted on Sep 15, 2010

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  • Honda Master
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Disconected coil fuse and check if the fuse blown again; didnt blow turn ignition off reconected coil fuse went striaght away. Does this mean new coil needed.

In other cases, I hear that the O2 sensors caused this problem; what other if any accessories are on that same fuse? Some have the 12v plug in on that same fuse. I'll be checking into that otherwise if its by itself, have you tried replacing the o2 sensor, could be its shorted. Measure what the volts to the sensor are and make sure they are not over the 5v reference supply from the computer and measure just how much of that 5volts is going back to the computer, if it is just a flat out 5volts Id replace the sensor.

Keep update.

Posted on Sep 14, 2010

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The Programmed Fuel Injection (PGM-FI) main relay in Honda odyssey manufactured between 1997 and 2000 is located on the passenger's side behind the dashboard and glove box. This relay actually contains two relays within it--one that controls the power to the fuel injectors and a second relay that powers the fuel pump. When you start the car there should be a clicking noise coming from this relay if the relay is working.if there is no clicking noise then the main relay is faulty. Remove the glove box and passenger's dashboard lower cover. Pull on the right and left glove box.Locate the main relay toward the back of the dash and push aside or disconnect any wires, devices or other relays that block the main relay from view.
In some cases the
PGM-FI relay is not faulty but the ECu it self is faulty causing the fuse to blow.To test this try this procedure .Instead of 10 amp fuse try inserting 25 amp fuse and check.If the car does not start or the fuse blows after long time then its faulty ECU.But if the 25 amp fuse also blows same like 10 amp fuse then yes the
PGM-FI relay is faulty causing the problem.The relay has to be replaced.------------------ Thanks. keep updated for any more query.you can rate this solution and show your appreciation.

Posted on Sep 14, 2010

  • raj somaiya
    raj somaiya Sep 26, 2010

    Thanks for letting us know ,that your problem got solved.

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These type problems are very hard to track down. And it sounds like when the engine gets hot it is causing a direct short. It could be any sensor that is associated with the ECU, or even the ECU itself. This can get very expensive replacing sensors and ECU. There are too many sensors to start replacing. If your check engine light is on you should find out what sensor is causing it to be on and start there. Good Luck.

Posted on Sep 13, 2010

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No other components to be supply the that fuse just the 4 injectors, iac valve and the egr valve, i recommend that change the iac valve because some issue like this solve after replcement of iac valve

Posted on Sep 13, 2010

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  • Honda Master
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Japanese import ,sorry dealer only as this vehicle is different to a normal one and uses a totally different system as regards to software to europeon or american model .I have a funny feeling you will need a new ECU but it could be a problem with the spark/timing side of the ECU like a coil pack causing it .BUT?? its japanese software used so trying to find the fault with a OBDII machine is out of the question

Posted on Sep 12, 2010

  • Colin Stickland
    Colin Stickland Sep 14, 2010

    if you have a wiring diagram then trace the wire the best you can in case its damaged on route and crushed somewhere ,or as a temporary try out disconnect the fused side of the fuse and run a wire direct to see if the short stops ,if it doesnt then renew the valve but if it cures the problem then i be a bit concerned in case its shorting to another component ,but with the power removed then it might not short any further ,trying to find the fault ?? you will need the patience of a saint though

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  • Master
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Hello. I recommend that you drive to a local autoelectric repair shop. They are listed in the yellow pages. These shops have all of the electrical wiring diagrams, diagnostic tools, parts, knowhow to find your problem and fix it. Well worth the cost for your own safety and peace of mind. J.

Posted on Sep 12, 2010

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