Hey guys, still new to the whole C5 thing here...I just got a check engine light on the way home this morning and unlike the ZR1 and other C4's my light does not reset after I restart the car. So how do I clear the code and/or find out what caused it. There was no difference in the cars performace after the light came on. Nothing out of the ordinary....Will just a battery disconnect reset the computer? Not sure..... BTW, car is a 98 6spd coupe.


[Modified by LPDesRoche, 1:25 PM 4/24/2003]

 

TTT for me...:)

 

Hi Lee , here some info that should help .

IPC Codes -- 1 of 1
Date Published: 2001-06-09

Submitter's Name:
Email Address:
Corvetteforum.com Member Alias:


The IPC display, the
20-character, vacuum florescent screen above the steering column that
says "Corvette by Chevrolet" every time you turn on the key is a powerful
device.

DIY Service Techs
are going to be most interested in the LPG’s ability to show diagnostic
trouble codes (DTC) for all the modules that transmit them..

The "diagnostic display"
mode is entered with the following Procedure: Page 8-500

Turn on the ignition
but don't start the engine.

Press the "reset"
button to turn off any warning messages

Press and hold
"options" and

While holding "options",
press "fuel" four times within a 10-Second period.

Initially, the on-board
diagnostics go into the "automatic" mode, which shows each module's DTCs
in a pre-set sequence: (Page No. are for the GM Service Manual)

10 PCNI Powertrain
Control Module page 6-357 - 6-361

28 TCS Traction
Control system ABS on page 5-86

?? RTD Real Time
damping page 3-136

40 BCM Body Control
Module page 8-405 LTD Page 8-727

60 [PC instrument
Pane! Cluster page 8-508

80 radio page 8-213


99 FIVAC Heater
Vent-Air Conditioning page 1-118

A0 LDCM Left Door
Control module page 8-904 to 8-951

Al RDCM Right Door
Control Module page 8-904 to 8-951

AC SCM Seat Control
module page 8-1064-8-1082

B0 RFA Remote Function
Actuation page 8-676

For each module, all
DTCs will be displayed. If none are present in a module, you will see
"no more codes" on the ICP display. There are two kinds of DTCs, "Current"
and "History," designated with a letter suffix, "C" or "H". A current
code indicates that the malfunction is present in the system whose module
is displaying data. A history code indicates a problem existed in that
module sometime in the last 40 or 50 ignition cycles. When not accompanied
by a current code of the same number, it is possible it's evidence of
a previous problem. Now solved, that was not removed by clearing codes.
More likely is that a history code indicates an intermittent malfunction.


"Intermittent" are
the most challenging DTCs. An intermittent may have happened only once,
may have happened more than once but is inconsistent in its appearance
or may be happening on a regular basis but not at the time the IPC is
displaying codes. History codes can also be caused by a current malfunction
in a system that is not Operating at the time DTCs are displayed. An example
is the rear window defogger, which doesn't operate until the BCM detects
engine rpm. For history codes set by a system that does not operate with
the key on and engine off, a special diagnostic tool called a "scan tester
is necessary to properly diagnose the malfunction.

Once the IPC has displayed
all 11 modules, the system goes into the manual mode, which allows selection
of each module, using combinations of DIC buttons. The manual mode can
also be entered at any time during the automatic sequence by pressing
any button except "E/M". Once the IPC displays "manual diagnostics", you
may select a particular module by pressing the options button to go forward
or the "trip" button to go back. Once a system is selected and a DTC is
displayed, if more than one are present; press "gages" To move forward
or "fuel" to go back. To exit the diagnostic mode at any time, press E/M".
If you want to erase or "clear" codes, press "reset". Clearing a code
does not repair a problem. You are simply erasing the evidence of it in
the module's memory.


:cheers:

Jeff

 

Will this method get the codes that the light in the instrument cluster represents? I thought this only got the stuff that the DIC(digital lettering that you see at startup) was telling??

Lee

 

Sweet!!!...Code is cleared....not sure why it popped up but it's gone now. I will see if it just popped up as a fluke or if it repeats itself. Not sure what was up with it. Thanks for the help!:cheers:

Lee