Tried searching this forum --

Need access to see if my check engine light bulb is out, missing, etc.

Does anyone know the steps to get to it? Hopefully the entire dashboard does not need to come out.

Thank you!

Not really geared toward bulb replacement, but you could use this to get the instrument cluster out. It isn't hard at all, and you wouldn't need to disconnect anything just to change the bulbs. They twist out bayonet fashion.

Temp Faker

--
Art Benstein near Baltimore

If you lend someone $20 and never see that person again, it was probably worth it.

Thank you very much.

However, I put in a new bulb and my check engine light does not come on (then go off after starting). So I have deeper issues.


Steve

Assuming that all of your other instrument lights are working, you can start by testing the circuit that grounds the light. As Art mentions, the sources of the grounds are pin 22 of the ECU and pin 3 of the ICU, through a pink wire. That pink ground wire runs through pin 3 of the semi-circular connector that plugs into the back of the instrument cluster.

Put the ground side of a test light on that pin, and the other wire on a reliable 12v source, and turn to KP II - if the test light comes on, the circuitry to that point is okay, and the problem is more likely in the cluster circuits.

Thank you.

So, put the ground side of the meter on the Pin 22 of the ECU, and test as above, and then do the same thing for Pin 3 of the ICU, and test again? Or are you referring to Pin 3 on the instrument cluster?

Regards,

Steve

Sorry - I wasn't clear - ground side of the test light to pin 3 - actually, hole #3, pink wire - of the semi-circular plug. If you get a light, then the circuit is good to that point, and the problem is more likely in the cluster.

Hi,

I have current via the plug for the pink wire as ground.

I might be going through all this for no reason. There's not even a bulb (just a white plug) in the Check Engine socket. One smog shop says I need to have one, yet another one says I don't. The Volvo manual indicates that 1991 is the first year that this light "began". I have a 1990 California car.

Again,

Thanks very mucy

Took car to Smog Ref in CA, was told that the 8 valve 1990 does not have this requirement, but the 16-valve 1990 engine does (turbo?). 1991 8 valve an onward must have it.

So, they passed me!

Thanks everyone.

1989 starts the check engine light era on a 240. You have have an earlier cluster someone mistakenly put in your car.
--
Art Benstein near Baltimore

The early bird might get the worm, but the second mouse gets the cheese.

Thank you Art. I was reading 253-4 in Bentley, and it seemed to indicate that 1989 CA cars had EGR added, and 1991 EGR checking was added to the on-board diagnostic system.

Anyways, I put a working bulb in there and it does not come on in KPII, which means it doesn't go off when the engine starts running.

Did the onboard diagnostics and I get a 1-1-1.

Regards,

Steve

It comes from pin 22 on the ECU in parallel with pin 3 on the ICU, on a pink wire. That supplies the ground side. The hot side is the same voltage that powers all the other warning lights and gauges.
--
Art Benstein near Baltimore

When fish are in schools they sometimes take debate.

Than you Art!