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Wiring for Check Engine Light
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Hi SV Group,
I'm having problems with my check engine light. It a manual trans, '91 EJ22. I'm using the KEP wiring diagram. I have one side of the light running to the engine compartment and the other under the dash ta the fuse box. See pictures. In the engine compartment the wire goes into a White plug attaching to the yellow wire. Under the dash it attaches to a Black/yellow wire, is the the Tach wire? Thanks in advance, Rich |
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Rich,
I don't know what KEP tells you about the check engine light; I don't recall that they even mention it. I also don't understand your reference to the tach wire; the tach has nothing to do with the CEL. The colors of the wires are not something I recall. Having said all that, I will tell you what I feel is relevant. The most important info you need is what pin on the ECU goes to the CEL on that year and model. You should be able to find this out from the files on our group site or on sites that are linked to. That pin on the ECU goes low (to ground) when the ECU wants to turn on the CEL. Thru a resistor, that pin needs to be connected to the LED that you use for the CEL. You did not mention whether you want to install it in the instrument cluster or near the ECU. In any case you need to connect the other end of the LED to a source of +12V that is on when the ignition is on. Such a source of 12v can be found on the instrument cluster or on the wires supplying the ECU. The resistor in the circuit is needed to prevent the LED from being overloaded by too much current. I would use something like 500 to 800 ohms, 1/2 watt or 1/4 watt. The LED will light only when it is connected in the right direction. You can check this using a 9V battery if you wish, again using the resistor to limit the current. Good luck, Larry A. |
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That's the same diagram I used for two conversions. Best source I found for a '93 EJ22.
Unfortunately I printed it in black and white which makes some of the yellow lines hard to follow. Mine was also on six separate sheets stuck together with tape. :-( On the most recent job, I took a laptop along to the shop so I could check the color version when needed. What fun. Larry A. |
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Below is an old post from this group that may help you.
It is slightly trimmed and from the old yahoo group. Mark -------- Forwarded Message -------- Subject: Re: Wiring for Check Engine Light Date: Mon, 26 Jun 2017 22:36:09 -0400 From: Larry A Rich, I don't know what KEP tells you about the check engine light; Having said all that, I will tell you what I feel is relevant. The most important info you need is what pin on the ECU goes to the CEL on that year and model. You should be able to find this out from the files on our group site or on sites that are linked to. That pin on the ECU goes low (to ground) when the ECU wants to turn on the CEL. Thru a resistor, that pin needs to be connected to the LED that you use for the CEL. You did not mention whether you want to install it in the instrument cluster or near the ECU. In any case you need to connect the other end of the LED to a source of +12V that is on when the ignition is on. Such a source of 12v can be found on the instrument cluster or on the wires supplying the ECU. The resistor in the circuit is needed to prevent the LED from being overloaded by too much current. I would use something like 500 to 800 ohms, 1/2 watt or 1/4 watt. The LED will light only when it is connected in the right direction. You can check this using a 9V battery if you wish, again using the resistor to limit the current. Good luck, Larry A. |
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Nicholas Fawcett
Hi everyone , didn’t realize we had so many subi vanagons living in south SLO county.? anyway once you get the CEL to come on, i find it worth the drive to get my 84 vanagon OBD1 2.2 smogged in ventura. the referee in oxnard did my first ever CA smog when i moved here from out of state.? also smogies smog shop in ventura has a working dyno, and the shop owner and his son are both extremely knowledgeable (and supportive) of the subaru conversion in these vans.? i’m sure someone in SLO county can help too. just my $.02 -Nick ?? On Thu, Jan 18, 2024 at 4:23?PM vw_van_fan_Mark <madvws@...> wrote: Below is an old post from this group that may help you. |
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