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1996 check engine light
10-20-2010, 01:18 PM (This post was last modified: 10-25-2010 11:01 PM by troubled.)
Post: #1
1996 check engine light
My check engine light will not go out. I've tried disconnecting the battery, pulling the computer fuse, and erasing the code with the diagnostic tool. Nothing has worked. What have I missed? The code I get is P0122(Throttle position sensor) and I have replaced the T.P.S.
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10-20-2010, 06:19 PM
Post: #2
RE: 1986 check engine light
What code or codes do you have?

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Garner

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10-20-2010, 10:11 PM (This post was last modified: 10-20-2010 10:18 PM by Rupe.)
Post: #3
RE: 1986 check engine light
Also tell us more about how long it takkes for the light to come on after the engine starts. Right away or a few minutes?

The light should come on when you first switch the key on, then go out a few seconds after the engine starts. This part is normal. If the light goes back on there will be either a code in storage or a malfunction of the bulb chek relay circuit.

BTW, if the bulb check system has an issue there will be other warning lights on as well.
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10-23-2010, 05:27 PM
Post: #4
RE: 1986 check engine light
(10-20-2010 10:11 PM)Rupe Wrote:  Also tell us more about how long it takkes for the light to come on after the engine starts. Right away or a few minutes?

The light should come on when you first switch the key on, then go out a few seconds after the engine starts. This part is normal. If the light goes back on there will be either a code in storage or a malfunction of the bulb chek relay circuit.

BTW, if the bulb check system has an issue there will be other warning lights on as well.

Everything was fine with the car. Then I worked on it. (N.L.O.L.) A month ago, I had no issue with C.E.L. The Isuzu became hard to start, no check engine light. Evrythng pointed 2 E.G.R. Decided to change the plugs at the same time & found sparkplug tube full of oil.(frnt lft bnk) Had to replace Tube Seal. So had to remove cylinder cover(& all that it applies). I did check the tranny fluid & found it 2 b half-a-quart low.(now there's a fun job)
But now, C.E.L. comes up with two helpings of P0122(T.P.S./throttle pos.)& remains, even after being cleared. Verrrrrrrrry Troubled.
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10-23-2010, 06:48 PM
Post: #5
RE: 1986 check engine light
The reason it remains is the code is current so I suggest you back track your work and look for a plug that's not fully seated on the TPS, or perhaps it's just time for a new one. After all the car is 24 years old.

Speaking of old, it's also possible the plug has some crud on it or possibly a broken wire connection due to age / brittle insulation.

Let us know what you find.
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10-23-2010, 07:53 PM
Post: #6
RE: 1986 check engine light
Will keep u posted
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10-23-2010, 10:53 PM
Post: #7
RE: 1986 check engine light
That's strange. Unless I am mistaken a 1986 should have an OBD-I system. OBD-I systems used a two digit code. P0122 is an OBD-II code for Low Voltage on the TPS. If this car does in fact have an OBD-II system then I would suspect a blown fuse, broken or rubbed through wire, or, as Rupe said; a corroded or damaged plug not letting the proper voltage get to the TPS. With all of the work that you done you might want to make sure that you didn't pinch a wire under something when putting it back together.

Please keep us posted.
Thanks, Garner

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10-23-2010, 11:01 PM
Post: #8
RE: 1986 check engine light
Yes, I noticed the same thing but in that era some of the Asian and European cars were ahead of the US with OBDII so I didn't question it. Matter of fact about that time I saw my first grey market import of a Suzuki Samari and it still had a carb! Obviously we could not get parts for it easily.
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10-25-2010, 06:28 AM
Post: #9
RE: 1986 check engine light
I never heard of a vehicle earlier than 1994 that was OBD-II compliant. This vehicle is supposed to be eight years before that time. I could see a carburetor in the 80's because I seen many OBD-I systems with a carburetor. I was thinking that they might have typed the wrong year and it is really a 1996? It doesn't look like we are going to find out though since we haven't heard from them.

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10-25-2010, 10:06 AM
Post: #10
RE: 1986 check engine light
Yes, I see your point and also can't think of any cars specifically OBDII compliant that early. OTOH, also wondering if there's some cars we really don't get to see, such as high altitude or California only emissions.

That said, we don't have all of the details here either. I know many of the Asian cars of that vintage could not be reset via a battery disconnect. I also know they had a different under-dash plug than the typical US car so scanners were not universal at that point.

Speaking of things not being universal, I wonder if the scanner he's using is an early one with dozens of adaptors and if using the wrong software cartrige is throwing us a curve ball?
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