Hyundai Excel '94

Does anyone know how to read the error codes from the computer of a '94
Excel? With a Hyundai S-Coupe it sould be possible to read the codes by
grounding te L-wire for 2 or 3 seconds. The check engine light should give
a kind of morsecode that tells the error. Is this also possible with a 94
excel?

 

Check out www.hmaservice.com for a free online service manual for
your car. Somewhere in the emissions chapter should be instructions for
reading the codes.

Bob

 

If you connect an analog voltmeter between one of the pins in the dlc in
the fuse box and ground, it will sweep out the codes. The terminal is in
one of the corners, but I can't remember which one. And the automatic
trans terminal is in another corner, so if you have codes in both, that
could cause a problem. The codes are all two digits. You will receive a
series of long sweeps followed by a series of quick sweeps. Count the
long sweeps. That is the first digit of the code. The number of quick
sweeps is the second digit. There may be more than one code. Continue
watching and counting until the system repeates itself.

 

I will try that. Thanks!

 

Hey, I followed your advice. Here is the outcome:

Fault code:
13 intake air temp sensor or circuit
15 Motor position sensor or circuit
21 Coolant temp sensor or circuit
25 Barometric pressure sensor or circuit
41 Fuel injector or circuit
43 EGR system

Any suggestions?

 

Hey, I followed your advice. Here is the outcome:

Fault code:
13 intake air temp sensor or circuit
15 Motor position sensor or circuit
21 Coolant temp sensor or circuit
25 Barometric pressure sensor or circuit
41 Fuel injector or circuit
43 EGR system

Any suggestions?

 

Probably a bad ground splice. I believe these items all ground through a
splice in the EFI harness about one to two feet from the ECM connectors.
It is also possible, but less likely, that the ECM could be at fault,
since it provides the ground. I've fixed many of these splices, but it's
been a long time. If you can find it, cut out the splice, insert a small
length of suitable gauge wire, and solder it in and tape properly.

 

Go to www.hmaservice.com, select service information, and web tech. Click
on the TSB tab, enter your vehicle info, and select TSB 93-36-007. This
will describe the repair much better than I can.

 

Thanks a lot for the advice! I'll go find it out

 

I just remembered that this TSB was originally written for the 1990 Excel.
When they revised it to include later models, I don't think they updated
the splice location information. Don't be alarmed if you need to go an
extra foot or so to find the splice. If I recall correctly, I was able to
repair all of them under the dash without pulling the harness through the
firewall.