89 camry, no check engine light

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Old 19 Sep 2004, 04:43 pm   #1 (permalink)
jimhigh66
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Default 89 camry, no check engine light

I have no spark and have found nothing conclusive in checking the ignition
system and thought I would check for trouble codes. I noticed the check
engine light NEVER comes on. I pulled out the instrument cluster and the
bulb is OK. The PC board bugs OK and the other indicators light.
I can't recall if the check engine indicator was lighting, when I first
turn the key to ON, prior to the spark problem, or not. I'm thinking
this sympton is indicating a faulty computer ? Please advise.
Jim H.

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Old 19 Sep 2004, 06:28 pm   #2 (permalink)
jimhigh66
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Default Re: 89 camry, no check engine light, PS

I find no continuity to ground at any of the 5 contacts on the wiring
harness connector that mates with the ignitor. I can't see how the
ignitor could possibly drive the coil without a ground connection ! Could
this be the root problem -- does anyone know where in the car the ground
connection is made ? The Haynes manual shows a white wire from the
ignitor being grounded but I don't know that I can trust the manual,
especially since a white wire from the ignitor mates with a different
color wire at the harness connector. Jim H.

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Old 21 Sep 2004, 12:42 pm   #3 (permalink)
corolla_ke20
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Default Re: 89 camry, no check engine light, PS

Im also having the same problem: no check engine light
and no spark.have you found out the problem???

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Old 21 Sep 2004, 08:37 pm   #4 (permalink)
jimhigh66
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Default Re: 89 camry, no check engine light, PS

No -- I wish. Tried a post this AM at
http://autos.groups.yahoo.com/group/Toyotas_Only, which was recommended to
me but still hadn't see the post as of about a hour ago. Frustrating.
If you would, contact me at mounthighly@aol.com
Jim H.

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Old 22 Sep 2004, 08:00 am   #5 (permalink)
jimhigh66
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Default Re: 89 camry, no check engine light, PS

THAT'S "AAA OOO LLL . COMM"

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Old 22 Sep 2004, 11:16 am   #6 (permalink)
Daniel M. Dreifus
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Default Re: 89 camry, no check engine light, PS

"jimhigh66" <mounthighly@aol.com> wrote in message news:<a5566eba09001f5d6df116d6a7a57a67@localhost.t alkaboutautos.com>...
> No -- I wish. Tried a post this AM at
> http://autos.groups.yahoo.com/group/Toyotas_Only, which was recommended to
> me but still hadn't see the post as of about a hour ago. Frustrating.


Give the Toyota_Only forum a bit more time.

Those circuits can be complex.
I have the factory manual for the 1994 and it shows the circuits right
down to the transistors in the ingiter and the ECM.
Not sure yours is the same.
Basic advice is to check for secure connections or substitute another
igniter. Maybe you can find one at a wrecking yard.
For the '94 there are five connections to the igniter, and also a
ground - so it could be the case that's grounded. For the five
connections, one goes to IG2 at the ignition switch, one goes to the
primary windings in the ignition coil, one goes to the tachometer, one
goes to an IGT terminal at the ECM and one goes to an IGF terminal at
the ECM. There is also a connection to ground, but I suspect that's
the case.
There's a page in the factory manual for spark test. Check for spark
at the high tension distributor lead. Check coil and igniter
connections. Check high tension cord resistance. Check power supply to
coil and igniter. Check resistance of coil. Check resistance of signal
generator (pickup coil). Check air gap of distributor. Check IGT
signal from ECM. Try another igniter.
IGT signal "O" from the ECM (transistor 1 aka Tr1) turns off Tr2 in
the igniter, interrupting the primary coil current, and the igniter
sends an ignition confirmation signal (IGF) to the ECM.
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