Re: Intermittent Check Engine Light

[poffen@xxxxxxxxxxxxxxxxxxxx (Russ Poffenberger)]

> Date: Wed, 16 Sep 1998 10:57:39 EDT
> From: Bimmersg@domain.elided
> Subject: Intermittent Check Engine Light
> 
> I have a 89 E-30.  Intermittently my check engine light does not glow or glows
> slightly.  When this happens, the engine cranks but does not start.  When the
> light glows bright, the engine starts immediately.  All of the other warning
> lights glow bright all of the time.  Has anyone experienced this?  Does anyone
> know the wiring for this light?  I want to look for the ground point.  Does
> any one think it may be caused by the SI board?  Any and all suggestions would
> be appreciated.

The "Check Engine" light is driven directly from the ECU. The SI board should
not have any effect on it.

I also am pretty sure a bad ground would not affect the ECU's operation in
general.

I would suspect the ECU is not getting proper power. I think it has a fuse,
check that. Also check the wiring harness to the ECU (it is located above the
glove box, behind a panel you remove).


- --
Russ Poffenberger               Engineering Specialist
Schlumberger Technologies ATE   DOMAIN: poffen@domain.elided
1601 Technology Drive		CIS:	72401,276
San Jose, Ca. 95110             Voice: (408)437-5254  FAX: (408)437-5246

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