Question about 1997 Hyundai Accent

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Can not read ecm code for emission check in GA

The car runs great and has no check engine light on. The CEL comes on during initial start as it should, then goes out. In GA, they need to make sure their are no codes stored for the emissions test, to renew your license plates. The reader was hooked up, but they could not read any codes or anything. We took it to two other places, same result. We disconnected the battery and the ECM connector and checked the continuity of the harness per the wiring diagram in the repair manual. Its ok. Put another 150 miles on the car and had it retested, still can't read codes. Bad ECM? Common problem? Any info would help. Thanks 96 hyundai elantra...emissions can not get a reading from my car....what could be the problem???

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Normally if you can't get a reading from the ecm the ecm is dead, and goes to default mode meaning it will run ok but is at base timing and won't kick in to closed loop having the 02 sensor controlling fuel and timing, they did this because if the past if the ecm failed the car was a pull toy so you sat on the side of the road so the ecm could be bad. You could have someone do a pin out on the ecm but it would take more time than it would cost to replace the ecm.

Posted on May 30, 2009

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How do I read trouble codes for 91 geo storm? Scanners are to new to read.


that is true.
but some cars running obd1 , can be scanned,. (i have one)
like all GM cars and even older, , some ford, , Honda's . Toyota;s
but this car is GEO, (underdog, but is really what. a Isusu.)
Isuzu's cars are mostly not raced or sold here now. so who's going to make scanner for such a rare car and engine and EFI?
there is no OBD1 standard, each company uses a unique design.
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OBD2, in 1996 a USA invention is a standard and all tools work.
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what you have is the old blink codes. wink wink...
all OBD1 cars work like this (or very close)
you connect a jumper wire, and the CEL lamp flashes codes.
so is the CEL stuck on? running.
must come on key on, bad lamp or bad ECU.

you can check out Isuzu Impulse

Example storm post..OBD1991 (USA)
To put the ECM (Engine Control Module/Ignition Control Module/Engine Computer) into diagnostic mode, where it will flash codes at you using the "MIL" (Malfunction Indicator Light or "Check Engine" light), short pins 1 and 3 of the ALDL/OBD1 connector using a paperclip. When you then turn the key into the on position, the MIL should flash once, then pause a bit, then flash twice. That means code "12." If there are other codes, they will be flashed out as well. All codes are two digits.
end quote, on storm

but where is the connector DLC?
and which pin is 1 an 3
so. we google more, or look it up in alldata.com like most do.

or here
http://www.robietherobot.com/storm/stormFAQ.htm

that was the 1st google hit, using clear text human questions.
DLC jumper storm or Impulse.
or diagnostic jumper Impulse.

join a Geo storm or inpulse forum and ask for scan tools.
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1 Answer

Engine emissions warning comes on with audio sound when initially starting (or switching the ignition on).Goes out after 5/6 seconds The emissions are fine Tried new air mass meter and new glowplugs.


First of all you need to access the Engine Control Module (ECM) using suitable diagnostic equipment connected to the data link connector of the car, in order to pull out all DTC's memored. DTC = Diagnostic Trouble Code. Then you will bu full informed about the root cause of the problem, and you will be able to repair & replace bad pieces and reset the ECM. Then the EPC (Electronic Pedal Control) yellow light will turn OFF.

The check engine light:

tdisline_743.jpg


The check engine light & EPC light:

tdisline_744.jpg




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They change an sensor on my 2003 suburban 1500 and this fixed the check engine light status. However they must of done something or not hooked something back up, since now the check engine light does not...


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Just 2 days a go my honda cr-v 2002 light engine check on the car running well like nothing wrong. plz what is problem


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Good Luck!

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1 Answer

2004 chevy aveo that the check engine light keeps coming on. The electronic find showed three code PO 128, PO 700, and P 1781


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P1781 is set during engine start up when the ECM & TCM do not communicate properly during initial power up. It will only illuminate the service light if the condition occurs in 2 consecutive start cycles, but the DTC will be stored in the failure records after the first cycle.

Replace the Thermostat and go to a transmission shop that can read the DTC codes with a scanner and reset the ECM for clear the codes. Most Transmission shop will do that free of charge, if not turn the Ignition key's to the on position and and pull the ECM fuse out for 30 seconds and then place it back in. Turn the ignition keys to the off position for 10 seconds and then start the car, the engine may stall but let it. Just start the engine again, the ECM is just relearning the engine and go for a test drive. This will clear all the DTC history in the ECM like the day it cam off the assembly line. Good luck and keep me posted, be glad to answer ay more question.



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1 Answer

I did have the code p0443 and I replace the purge


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Can not read ecm code for emission check in GA


Check to see if their is power going to the OBC...

Mar 22, 2009 | 1997 Hyundai Accent

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