I was running a check on my OBD1 system, and got 111 all clear, but also got codes 173 and 542 from memory. The book I have to explain those codes is about as clear as mud. Anyway, shed some light on what I am needing to do here?

Thanks.

 

What are your symptoms?

Which engine?

Which tranny?

Crystal ball is out of order...

Steve

 

Its a 302 5.0L engine, with E40D trans, and 3.55 REG 8.8" Rear End. I don't seem to have any issues, other than RABS light, but I have these codes in memory, and thought I would fix them if they pointed to something directly.

Thanks.

 

If the KOER test passes, clear the memory and drive cycle the truck.
If a cel comes back on, read the codes set, and service for the codes, otherwise no cel nothing to chase. You may be looking at old history now.
By clearing the codes, your not going to miss anything because if there are problems they will reset the codes..

 

Thanks, how does one clear the codes from memory?

 

There are two ways to clear the KAM.
You should have a seperate plugin lead at the test connector.
Set up to output the codes.
Once this begins just pull the seperate lead off the reader while the codes are outputting.
This will clear the memory.
The second way is to remove one battery terminal and let the memory supply discharge about 5 minutes.
The second way reboots the EEC back to it's base tables and all drive cycle learning is lost.
Sometimes this needs to be done after certain faults are cleared, to revert back to normal learning and drivability.
When chaseing faults, always work with the latest codes so you are not spending time and money on old history where no fault exists. This causes confusion if old history is used in the chase.

 

Thanks, appreciate the information.

 

OK, on to another part, the RABS light, I changed the sensor on the rear axle, but the light is still present. Any thoughts on how to trouble shoot this?

Thanks.