ECM codes - ZR-1 Net Registry Forums

vilant · 02-20-2013

Anyone know which ECM malfunction codes turn on the Check Engine Light? I looked in the FSM and it gives the # and what it refers to. But I don't see which, out of the 30 codes, actually turn the CEL on. Do all ECM malfunction codes turn on the CEL? Or none at all? Is there a list of which ones do and don't, somewhere in the FSM that I missed? TIA

tccrab · 02-20-2013

Pretty sure pretty much all ECU codes will trigger the CIL.

CCM, BCM (ABS, AC, etc) codes don't trigger CIL.

'Crabs

vilant · 02-20-2013

Thanks, Tom. I should of put SES instead of CEL. But you got the idea. I just think it's strange a few of them do, like #52 low oil temp or #15 low coolant temp.

Hib Halverson · 02-20-2013

I think, if you read the diagnosis info for those DTCs, the codes set when the ECT or the oil temp sensors are sending an impossible signal, ie: ECT below -26°F degrees when the engine is running or engine running for more than 30 minutes and oil temp below -36°F.

Either of those sensor signals would indicate a problem with the sensor or wiring so...the ECM turns on the MIL.

Schrade · 02-21-2013

Some diagnostics flow charts DO ask if there's a SES light lit up in the DIC, but which ones they are, escapes me at the moment...

And they can 'go away', if a few Closed Loop cycles pass without some circuit being called upon to check for spec parameters. EVAP Purge command might be one...

vilant · 02-21-2013

Quote:

Originally Posted by Hib Halverson

I think, if you read the diagnosis info for those DTCs, the codes set when the ECT or the oil temp sensors are sending an impossible signal, ie: ECT below -26°F degrees when the engine is running or engine running for more than 30 minutes and oil temp below -36°F.

Either of those sensor signals would indicate a problem with the sensor or wiring so...the ECM turns on the MIL.

Ah, didn't think of that, good point.

vilant · 02-21-2013

Quote:

Originally Posted by Schrade

Some diagnostics flow charts DO ask if there's a SES light lit up in the DIC, but which ones they are, escapes me at the moment...

And they can 'go away', if a few Closed Loop cycles pass without some circuit being called upon to check for spec parameters. EVAP Purge command might be one...

There's definitly codes that get stored. When I took mine in to get inspected, I asked the mechanic to see if there was any codes. There was a slew of them, but the SES was never on. Like you say, the light was probably on, then the problem either went away or the PO had it fixed, but never cleared the codes.

Hib Halverson · 02-21-2013

If codes were stored but the light was off, either they were history codes or there's a problem somewhere with the MIL.

When you key up but don't start the engine does the MIL come on during bulb check?

02-20-2013	#2
tccrab Join Date: Oct 2004 Location: Folsom CA Posts: 1,654	Re: ECM codes Pretty sure pretty much all ECU codes will trigger the CIL. CCM, BCM (ABS, AC, etc) codes don't trigger CIL. 'Crabs __________________ TomC '90ZR1 #792 Honorary Pirate [B]If it ain't FUN, you're doing something terribly WRONG. [/B]

02-20-2013	#3
vilant Join Date: Jun 2012 Location: PA Posts: 772	Re: ECM codes Thanks, Tom. I should of put SES instead of CEL. But you got the idea. I just think it's strange a few of them do, like #52 low oil temp or #15 low coolant temp. __________________ Joe 1990 Bright Red ZR-1 #2599

02-20-2013	#4
Hib Halverson Join Date: Jun 2005 Location: CenCoast California Posts: 899	Re: ECM codes I think, if you read the diagnosis info for those DTCs, the codes set when the ECT or the oil temp sensors are sending an impossible signal, ie: ECT below -26°F degrees when the engine is running or engine running for more than 30 minutes and oil temp below -36°F. Either of those sensor signals would indicate a problem with the sensor or wiring so...the ECM turns on the MIL.

02-21-2013	#8
Hib Halverson Join Date: Jun 2005 Location: CenCoast California Posts: 899	Re: ECM codes If codes were stored but the light was off, either they were history codes or there's a problem somewhere with the MIL. When you key up but don't start the engine does the MIL come on during bulb check? __________________ Hib Halverson Technical Writer former owner 95 VIN 0140 current owner 19 VIN 1878

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02-20-2013	#1
vilant Join Date: Jun 2012 Location: PA Posts: 772	ECM codes Anyone know which ECM malfunction codes turn on the Check Engine Light? I looked in the FSM and it gives the # and what it refers to. But I don't see which, out of the 30 codes, actually turn the CEL on. Do all ECM malfunction codes turn on the CEL? Or none at all? Is there a list of which ones do and don't, somewhere in the FSM that I missed? TIA __________________ Joe 1990 Bright Red ZR-1 #2599

02-21-2013	#5
Schrade Join Date: Dec 2012 Location: NC Posts: 1,786	Re: ECM codes Some diagnostics flow charts DO ask if there's a SES light lit up in the DIC, but which ones they are, escapes me at the moment... And they can 'go away', if a few Closed Loop cycles pass without some circuit being called upon to check for spec parameters. EVAP Purge command might be one... __________________ I'm getting my snappics / threads removed blindly as fast as I can, to get in compliance with copyright / license TOS on the boards here (lots of FSM pages and other copyright / license violations on my part; sorry guys). And thanks to all the guys who didn't whine when I posted those FSM copyrighted / licensed stuff in my threads... ( :thumbsup: [b]and to think I complied with a mod's request to delete a pic of him in a Challenge Car in NCM Museum, so he wouldn't get in hot water)[/b] Thanks to several guys here for sending parts FREE; BearlyFlying, WeGone, Geezer, GoldCylon, and more there, TonyD, mike100, fletchusmc... 1990 #2794; 4L60e Stage V by RPM Transmission, TCI Dedicated TCM, OBX Stainless, Power Effects 3" [IMG]https://lh5.googleusercontent.com/-GHpfzty7DVU/UQn-0Ru2xAI/AAAAAAAAA14/08mz1p4QLD4/s445/Screenshot-5.png[/IMG]