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Guest Message by DevFuse
 

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need "check engine" light help


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13 replies to this topic

#1 johnd911

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Posted 25 January 2004 - 04:00 PM

3 times in the last 3 weeks (below 20 degree weather here in Buffalo) my check engine light would light up, if i shut the engine off and immediately restart the car, it would not reappear. I have a 93 legacy.
No driveability problems, perfect ice cold starting, no change in gas mileage etc. Any ideas on what could be the problem? Is the computer smart enough to sense something going before it goes? thanks

also, is there a way of getting codes out without going to the dealer etc. I know I once found a page that let me find tranny error codes by counting lights.

#2 davidji

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Posted 25 January 2004 - 05:16 PM

Not sure it applies to your car, but this might help.

#3 johnd911

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Posted 25 January 2004 - 05:31 PM

anyone know how to read the codes on a 93 legacy. the car talk link dealt with a gl.
If it is the egr valve, where is it on a 93 legacy?

#4 LeakingOil

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Posted 25 January 2004 - 08:18 PM

Check out Josh's site (very informative)

Legacy777

Notes&Tips then Engine Related

Smiles,
Melis

#5 Legacy777

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Posted 26 January 2004 - 09:02 AM

yeah check out my site.....let us know what you find.

there is no egr valve on the 1990-1994 legacies.

#6 Setright

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Posted 26 January 2004 - 12:59 PM

Could be the knock sensor. Throttle response is dulled as long as the Check Engine light is on. There was a redesign of the sensor. The single wire connector should be white, if its grey then its the old model.

#7 OthercarisaFiat

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Posted 27 January 2004 - 08:39 PM

Originally posted by johnd911
3 times in the last 3 weeks (below 20 degree weather here in Buffalo) my check engine light would light up, if i shut the engine off and immediately restart the car, it would not reappear. I have a 93 legacy.
No driveability problems, perfect ice cold starting, no change in gas mileage etc. Any ideas on what could be the problem? Is the computer smart enough to sense something going before it goes? thanks

also, is there a way of getting codes out without going to the dealer etc. I know I once found a page that let me find tranny error codes by counting lights.

I don't mean to hijack the thread, but my wife's car (93 Legacy turbo) is doing something similar. Only it's not quite as cold here, and it just started today. I drove it tonight and it didn't come on. I read the codes, they are:

13 - cam angle sensor
21 - Water temperature sensor
23 - Air flow sensor
42 - Idle switch

If the cam angle sensor was faulty, the car shouldn't run (but it does). The others should affect running to some extent, but it seems to run fine. I'm assuming it's OK to drive for the time being. I don't know how old all those codes are either, so I'm thinking I will reset the ECU and see if it does it again.

#8 johnd911

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Posted 27 January 2004 - 09:17 PM

I haven't read my codes yet, when I looked under the dash i only saw one black connector. Will read my codes in the next few days, the light hasn't appeared for over a week now-it is 15 degrees warmer now (20 degrees F.)
ALSO: my air bag light has been on constantly for 3 months now.-ANY IDEAS why?

#9 OthercarisaFiat

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Posted 27 January 2004 - 10:52 PM

Originally posted by johnd911

ALSO: my air bag light has been on constantly for 3 months now.-ANY IDEAS why?

I had this happen on a different car, a 1992 Dodge Stealth. The SRS (air bag) light would come on whenever the battery voltage was too low, and would not self-clear. A dealer could clear the code, but then the light would come on again after the battery was low again.

#10 Legacy777

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Posted 28 January 2004 - 08:51 AM

OthercarisaFiat,

Reset the ecu and see what codes come back. Always do this when diagnosising so you can rule out any erroneous codes.


johnd911,

There are ways of reading the airbag computer too....which I'd probably recommend doing.....I'll have to see about getting the procedure.

#11 OthercarisaFiat

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Posted 28 January 2004 - 11:17 AM

Originally posted by Legacy777
OthercarisaFiat,

Reset the ecu and see what codes come back. Always do this when diagnosising so you can rule out any erroneous codes.


I'll try that. If these codes are stored indefinitely, the cam angle sensor could be from when the timing belt broke 2 years ago. The others, I have no idea.

#12 OthercarisaFiat

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Posted 02 February 2004 - 11:15 PM

OK, I cleared the ECU last weekend, and today the CEL came on again for a few seconds and went out. Car was cruising at about 25mph, warm engine, 4th gear, outside temp about 32. Only code that came up today is 42 = idle switch. Car appears to run fine.

What does an idle switch do? Is it important? Should I replace it?

#13 Setright

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Posted 03 February 2004 - 02:41 AM

The engine will run fine with a busted cam angle sensor. If the crank angle sensor goes at the same time, THEN you have problems. These sensors tell the ECU the same thing, if one fails, it is ignored.

#14 Legacy777

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Posted 03 February 2004 - 07:11 PM

Idle switch is in the TPS sensor. You can verify the TPS ie idle switch is properly adjusted by following the test procedure in the following scan
http://www.main.expe...PS_testing3.jpg

If it is out of spec, adjust it, so it's in spec. If you can't adjust to spec.....you should most likely replace the TPS.




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