1989 Toyota Camry V-6 (Is My ECU Ruined?; Plus ECU CompatibilityQuestion)

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Old 31 Jul 2010, 06:06 am   #1 (permalink)
Glen
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Default 1989 Toyota Camry V-6 (Is My ECU Ruined?; Plus ECU CompatibilityQuestion)

Hello All,

I have visited this group before for some useful information, and I'm
hoping someone can help me, as I really goofed up a few days ago, and
may have fried the ECU of my 1989 Toyota Camry LE Wagon, though I'm
not yet certain that this is the case.

I changed my oil three days ago, along with the air filter. And since
I knew that the large, rubber air cleaner boot (air cleaner to
throttle body) was cracked, I decided to install a nice used
replacement that I had found on ebay a year or so ago.

While doing all of this, I decided to check up on my distributor's
rotor, to see its condition, and possibly replace it, too, if
necessary.

Here's where I really screwed up. To gain better access to the
distributor, I tried to remove the plug to the what I have now
identified as the AIR FLOW METER (AFM). But while I should have first
removed the small rectangular-shaped wire clip, I instead removed the
two phillips-head screws and gingerly pulled back on the wire. This
revealed some long rectangular-shaped copper leads inside where the
plug enters. I that this was not the correct way to unplug the
wiring harness from the AFM, and rather realized that the rectangular
wire clip was the key to removing the plug, so I pushed the assembly
back into the AFM and tightened up the phillips screws.

Keep in mind here, that, like an idiot, I DID NOT have the battery
disconnected during the aforesaid maneuver.

And when I went to start the car, the motor turned over repeatedly,
yet wouldn't start. It didn't even sound like it wanted to start.

I removed one of the plug wires, and put a copper testing wire that I
have in my tool box for such an occasion, and had my neighbor turn the
motor over while I held the wire about a 3/16" away from a metal
bracket in the engine compartment. NO SPARK!

I then retrieved my Toyota shop manual proceeded to test a number of
things, using a multimeter.

All of the fuses are good in the fuse box. (e.g. EFI, 7.5 amp, etc.)

The ignition coil checks out fine, via two resistance test values,
both within specified ranges.

I could not confirm, however, voltage to the positive side of the
coil.

Nor did I receive the correct resistance specifications for the pickup
coil in the distributor.

Also, when I used a paper clip to jump the specified terminals in the
diagnostics port, there is no steady flashing
"CHECK ENGINE" light appearing on the dashboard.

Hence, with this being said, I have the following questions:

1. If the fusible link at the positive side of the battery were
blown (I forgot to check this, but will today)
would the car still turn over, or would the starter not
receive power and turn over, as is currently the case?

2. If the distributor pick-up were bad, could this explain why the
check engine light won't come on, or does
that very phenomenon indicate nothing other than a short
within the ECU, requiring repair or replacement?
(NOTE: I am aware that the LED lights of instrument cluster
could be blown, yet that is very unlikely)

3. I have a spare igniter, or ignition module. Would it be worth
getting this from storage and installing it in
the car, or does the distributor come first in order of
electrical pathway for this circuit?

4. If I need an ECU, will one from 1990/91 models be compatible
with my 1989? (I've heard that the ECU
was re-designed by Toyota in 1990 or 1991, to improve cold
starts, thus may be different)

5. Is it mandatory to use an ECU with the exact same part number,
and is there any special procedure to
installing a used replacement ECU? (i.e. resetting or
clearing codes, unlocking anything, etc.)

In close, thanks for any advice or help in this matter. I truly
appreciate it. I usually take my 85 yr. old mother to to one or two
doctor appointments per week, and need to get this car back on the
road ASAP!

Respectfully,

Glen E. Sarkis
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Old 02 Aug 2010, 05:55 am   #2 (permalink)
Glen
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Default Re: 1989 Toyota Camry V-6 (Is My ECU Ruined?; Plus ECU CompatibilityQuestion)

Wow,

Did I lose everybody with a post that was too long or descriptive?

I was hoping I'd get someone's opinion of what my testing results have
yielded thus far,
and answers to my questions.

If anyone could lend an idea or two to help keep Japanese-built Toyota
out of the junk yard,
I'd greatly appreciate it!

--Strum4u-- (Glen)
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Old 02 Aug 2010, 11:50 am   #3 (permalink)
Johnny Melvin
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Default Re: 1989 Toyota Camry V-6 (Is My ECU Ruined?; Plus ECU Compatibility Question)


"Glen" <strum4u@msn.com> wrote in message
news:67854631-5629-4b84-a485-23c671253d76@r27g2000yqb.googlegroups.com...
> Hello All,
>
>
> Also, when I used a paper clip to jump the specified terminals in the
> diagnostics port, there is no steady flashing
> clearing codes, unlocking anything, etc.)
>
> In close, thanks for any advice or help in this matter. I truly
> appreciate it. I usually take my 85 yr. old mother to to one or two
> doctor appointments per week, and need to get this car back on the
> road ASAP!
>
> Respectfully,
>
> Glen E. Sarkis


Hi Glen,

Its frustrating not to get answers !!!!!.

I have no idea what fault ( if any ) you have caused.
But I spent 30+ years in medical equipment repairs
in UK Hospitals.

One thing I would do...is...carefully go over ALL the
places that you inspected.

Have you maybe not plugged some thing back in correctly or
just accidentally unplugged or disturbed some thing.

You may think NO, well just check it AGAIN,
SLOWLY don't ACCEPT its correct till you check
each place AGAIN.

I have a 1995 2.2 litre Camry.
From new..it just hit 102.000 miles.

Check check and re-check .
Good luck.

Johnny UK


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