c-4 check engine & abs lights

[Andrew Strauss]

I am working on a friends 87 repairing some wire damage under the hood.The check engine light is on due to faulty wiring wich has been repaired.The anti-lock brake light is on for reasons not yet known.My question is do I need a scanner to pull & clear the codes.If it is just a matter of jumping pins wich ones are they and were are they.

Thanks in advance

Andy

[John P.]

Re: c-4 check engine & abs lights

To delete the codes just disconnect the battery and let it sit for about 5-10 minutes and the codes will be erased from the computer.

To check what the check engine light has found its relatively simple, look under the steering wheel on the RH side of the bottom dash you should see a Thin rectangular shaped female plug in.
This is where you need a paper clip!
First the car motor needs to be off but the key needs to be in the ON position
Take a paper clip open it up so you have to ends in a U shape, Take this and while holding the plug use the paper clip to ground out the system, it should be the far RH side top and bottom receptacles, What happens next is the fan will come on and the check engine light will go out and then it will start to blink.
When the CPU is showing you the codes the first number will be represented by the CEL blinking weather its once or 4 times then there will be about a 3-4 second pause and then the second number will start to blink out. it will show you each code in this manure 3 times then go onto the next if there is more than one code stored.
1 blink then a pause then 2 blinks is a code 12 that means the system is operating perfect.
I do not have my manuals here so I cant tell you what codes mean what but while holding the paper clip in that's how the CPU tells you what it is getting..

I hope I made some sense I've been up all day!!

johnny

[Wayne W.]

Re: c-4 check engine & abs lights

You can simply disconect the battery to erase the codes. You can use a paper clip or some other device to ground the diagnostic terminals to read the codes. The check engine light will flash each code three times.

[John P.]

ABS

With the Abs if you have been working on the car and stating it repeatedly and not driving it the ABS computer will give you that dash light you should hear the pump cycle when you first break 5 MPH
If you reset the CPU and take it out for a spin Im sure that's all that is wrong with it, Its because the system hasn't been used in a few start ups I think its like 3 and you get the light!

hope this helps

johnny

[Rob Loszewski]

Re: c-4 check engine & abs lights

You will need a scanner to pull the ABS codes:

http://corvetteactioncenter.com/forums/showthread.php?s=&postid=145614