Topic: Maintenance Light

[Jeffy]

So, I get greeted by this annoying little light.  At first I thought it was a Check Engine but then I remembered it's that stupid lite for the emissions.  It came on at 82,600 miles exactly.  Now the next project is to turn it off.  Some seem to think it's on some kind of timer (1991-1995 don't have the emission timer box under the dash like the earlier ones do.)  I think it's clearly mileage based and to be more specific I think there is something in the gauge that triggers it.  What makes me think that is for a long time I had the wrong speedometer in my Jeep and so actual mileage was faster then indicated mileage.  Then there were the few times I drove without gauges at all.  I don't think my mileage is   In any case, I don't think it somehow calibrated to 82,600 actual miles and so happened to match the gauge.  That's just a guess though.  Actually some people say it's set for 82,500 miles but even so to be off by exactly 100 miles is unlikely.

So if it is something in the gauge then maybe I can reset it.  I've heard others mention that you can reset it through the Dealer or with a OBD scanner.  I'm gonna guess they just turn that sensor off in the ECM.  The other option is to just remove the bulb.  Anyone deal with this and not just removed the bulb?

[sharpxmen]

hmm, i doubt the YJ gauges are that smart, would require some sort of non-volatile memory or counter and i can't see how that would actually work otherwise with the mechanical odometer.

i've never seen that light btw, but mine did not reach that number of miles yet (82,500mi or 132,000km)

did you try resetting the computer?

I'll try and have a look in the FSM to see if there's anything mentioned in there

[Jeffy]

hmm, i doubt the YJ gauges are that smart, would require some sort of non-volatile memory or counter and i can't see how that would actually work otherwise with the mechanical odometer.

i've never seen that light btw, but mine did not reach that number of miles yet (82,500mi or 132,000km)

did you try resetting the computer?

I'll try and have a look in the FSM to see if there's anything mentioned in there

All that would require would be a contact switch and perhaps an arm on the 10,000 place as it rolls around, I would think.  From what I've read people have aid the counter is in the ECM but I don't think the ECM is that smart.  How is it triggering at the exact mileage if at times I've had inaccurate mileage?  I think it's mechanical still.  I haven't cracked open the FSM yet but I'll probably be doing it soon enough.

[sharpxmen]

apparently is not used in any of the '95 or '94 models

SERVICE REMINDER INDICATOR (SRI) LAMP
The instrument panel mounted SRI lamp was formerly
referred to as the emission maintenance reminder
(EMR) lamp. It is not used on any XJ or YJ
model for the 1995 model year.

SERVICE REMINDER INDICATOR (SRI) LAMP
The instrument panel mounted SRI lamp was formerly
referred to as the emission maintenance reminder
(EMR) lamp. It is not used on any Jeep
model for the 1994 model year.

i think you have a light in there and it shouldn't be but how its actually turning on it's hard to tell - i remember seeing the gauge wiring diagram somewhere in the fsm.

[sharpxmen]

look at FSM 94-8E.pdf page 15, there is no place or connection for Maintenance Reminder light, in fact that spot is supposed to be the ABS light (which i know you don't have). Same for the 95 and seems to be the same for 93 (based on the 94 manual it shows the 93 layout)

did you ever replaced the instrument cluster?

[Jeffy]

look at FSM 94-8E.pdf page 15, there is no place or connection for Maintenance Reminder light, in fact that spot is supposed to be the ABS light (which i know you don't have). Same for the 95 and seems to be the same for 93 (based on the 94 manual it shows the 93 layout)

did you ever replaced the instrument cluster?

My Jeep is a 1992 so those manuals will be only so helpful.  The FSM isn't really that helpful other then telling you it's there.  I'd hate to have to go to the Dealer to have it turned off.  I've already replaced my O2 sensor a few years ago and have gone through 3 cats/  Replaced the vacuum line from the CCV and cleaned the CCV passage as well.  So there isn't really anything emission-wise that would need replacing.  I still doubt the ECM is counting mileage though.  Not to the extent of being within 100 miles or accurate after all several years without the speedo being accurate.

[neale_rs]

When my PCM went bad I had the dealership check it out and they said I was lucky they still had the OBD I machine around, which they had not used in many years.  So I hope you don't have to go to the dealer for this.  You can always take out the bulb...

[Jeffy]

When my PCM went bad I had the dealership check it out and they said I was lucky they still had the OBD I machine around, which they had not used in many years.  So I hope you don't have to go to the dealer for this.  You can always take out the bulb...

In the meantime, that's what I'm going to do.

Maybe I should just buy a DRB II?

[sharpxmen]

so it's PCM controlled, interesting that they removed it for 93-95. Very unlikely that you'd make it that far with the original O2 sensor anyway, what a scam to make money resetting that light.

obviously it won't go away by resetting the computer so in the end you'll have to visit the stealership or some shop that has a scan tool. I'm so bummed i didn't get my hands on the one that was for sale in the Garage sale here :(

[Jeffy]

I pulled the bulb so I don't have to look at it.

It'll figure out something later otherwise, I'll just call it good.

[sharpxmen]

since it won't affect anything and you don't need it it's probably the best option.

[Jeffy]

I guess I'll post these pictures since I have them.  I still wonder how the ECM is triggered for 82,500 miles, I can't believe it's on just a timer, and why mine triggered at exactly 86,600 miles.

[sharpxmen]

are you trying to figure out if it's triggered by the speedo/odometer?

[Jeffy]

are you trying to figure out if it's triggered by the speedo/odometer?

I was then I just pulled the bulb and put everything back.   

[sharpxmen]

yeah, the YJ dash is completely analog and i can't see them implementing a mechanical trigger even in the 90s for that, just wouldn't make much sense

but that light is completely stupid, i think they did it for the European market, i recall all cars in late 80s and 90s having this annoying feature so they would force you to go to the dealership. in the Jeep's case what is odd is that as it was back in 91-92 this maintenance light would turn on after the warranty expired (can't recall but i think it was 50 or 75k or 5 years but someone should confirm) so wouldn't be covered during regular inspections 

they did remove it starting 93 as we could see in the FSM, i wonder if there were any complaints about it or something