Seems to me that the CEL light is working fine.....maybe you are lucky enough that the previous owner had a GDE tune installed that stops the MAF sensor setting a code when it is disconnected......not sure about the glow plugs though
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| Author: | enen [ Sat Dec 06, 2014 2:34 pm ] |
| Post subject: | CEL "cheat"? |
Hi, I'm a new 06 liberty CRD owner and appreciate all the information and help on this forum My CEL turns on when the ignition key is turned on and the CEL turns off before the engine is started The CEL is also off when there is a fault code. So,,,,either the previous owner flashed some patch that would cause the ecu to control the CEL in this manor or some relay or switch has been install in the CEL circuit. I've looked under the dash and nothing stands out as being non OEM Has anyone heard of a patch that will cause the CEL is function this way? Can someone help me find the wiring diagram for the CEL so i can better look for a possible hard wired relay that may have been installed to cause this "cheat"? on the CEL Thank you ian |
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| Author: | thermorex [ Sat Dec 06, 2014 3:31 pm ] |
| Post subject: | Re: CEL "cheat"? |
There are code that don't turn on cel. Like bcm codes, maybe would be helpful to post your codes so who knows them can confirm if they are ecm, tcm or bcm. For example pulling out the viscous heater relay will not trigger a cel, but scanning the code with an obd2 scanner, would reveal the code that viscous is not working. |
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| Author: | ArmyChief [ Sat Dec 06, 2014 3:55 pm ] |
| Post subject: | Re: CEL "cheat"? |
Look at NOOB sticky thread for FSM |
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| Author: | gmctd [ Sat Dec 06, 2014 4:51 pm ] |
| Post subject: | Re: CEL "cheat"? |
All EFI systems briefly energize the various lamps as operational check - wouldn't want to head out with a fault but the lamp was burned open, so didn't know the engine\drive-train was self-destructing right under my nose - some are even smart enuff to sense the burned-out bulb and blink the whole instrument panel as warning, or\and invoke limp-mode |
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| Author: | enen [ Sat Dec 06, 2014 7:20 pm ] |
| Post subject: | Re: CEL "cheat"? |
the lamp isn't burned out. the CEL lights up when the key is turned on I was under the impression that the cel should stay on untill the engine is running but my turns off before the engine is started I had glow plug codes and the CEL never came on I disconnected the MAF and the CEL didn't come on |
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| Author: | senatorjohn [ Sun Dec 07, 2014 3:28 am ] |
| Post subject: | Re: CEL "cheat"? |
Does your ABS light do the same thing? If there is no fault, all warning lights should light up when you turn the ignition on to do a bulb check, then turn off if you delay start for long enough. John |
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| Author: | Billwill [ Sun Dec 07, 2014 3:44 am ] |
| Post subject: | Re: CEL "cheat"? |
Seems to me that the CEL light is working fine.....maybe you are lucky enough that the previous owner had a GDE tune installed that stops the MAF sensor setting a code when it is disconnected......not sure about the glow plugs though
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| Author: | enen [ Sun Dec 07, 2014 11:00 am ] |
| Post subject: | Re: CEL "cheat"? |
the CEL turns off right away, the ABS light stays on for awhile I had an emission test done. It came back with 5 DTC, 4 for glow plugs, 1 for the disconnected MAF The test report indicated that the ECU was calling for the MIL(malfunction indicator light, same as CEL) to be on. It was off Thats why i suspect something hard wired into CEL circuit that is turning it off. Am I missing something? I'm new to owning a "modern" vehicle. I bought this for my wife as a trouble free "new" car I drive an old '95 diesel with no ECU |
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| Author: | gmctd [ Sun Dec 07, 2014 12:51 pm ] |
| Post subject: | Re: CEL "cheat"? |
In addition, IIRC, CEL flashes to prove operation, then shuts off unless a hard DTC is logged - some DTC do not evoke the CEL - DTC, CEL stays on when engine is running - no DTC, CEL is off while engine is running, lites again if engine stops without key off - this to alert you to non-running condition with IGN on, for whatever reason ABS is autonomous computer, takes awhile to boot, check it's peripherals, log-in, and wait for further, lite goes out - ABS lite sounds correct - it's the autonomy that causes problems when scanning the KJ intranet - ABS is not even a team player |
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| Author: | senatorjohn [ Sun Dec 07, 2014 10:52 pm ] |
| Post subject: | Re: CEL "cheat"? |
Need to be pretty good on electronics to mess with the requests to switch on or off the MIL. I have been researching it a bit and have almost given up. John |
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| Author: | enen [ Mon Dec 08, 2014 7:42 am ] |
| Post subject: | Re: CEL "cheat"? |
I found the wiring diagram, and appears that the CEL is integral to the instrument cluster So any strange CEL functions must be from software changes I will try and down load the program |
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