EVIC: oil change required message

vmf · **Posted:** Fri Apr 10, 2009 12:10 pm

hi guys, im wondering if this message is triggered by the sensor checking the oil or the by the mileage? according to the manual it depends on your driving patterns, but how?
i just switched to synthetic 1400 miles ago before i drove from new york to florida and once i got here i got the "oil change required, contact the dealer" warning message.

Mike08Liberty · **Posted:** Fri Apr 10, 2009 4:11 pm

Not sure how it comes on ... I change my oil about every 12k and I haven't seen that light for like 8k ... IF you look in your manual it tells you how to turn it off

vmf · **Posted:** Fri Apr 10, 2009 5:12 pm

r u serious? changing oil at 12k?
the manual recommends every 6k and i do it every 3k even after i switched to synthetic. but the question remains open: what triggers the message, mileage\driving pattern or a sensor in the engine?

Mike08Liberty · **Posted:** Fri Apr 10, 2009 10:08 pm

YES I'm serious ... I change my oil every 12-15K using Mobil 1 and a Mobil 1 oil filter. If are changing it every 3K on synthetic you are wasting money.

It's can't be mileage, you can cross that out. Like I said, I didn't have the light come on for over 8,000 miles. On the flip side I've had the light come on at 2,500 miles. It has to be a sensor.

vmf · **Posted:** Fri Apr 10, 2009 11:20 pm

thats what i was thinking, but than it would one expensive sensor and all the require cirquitry would be expensive as hell as well. guys with fsms etc, diggerfreek in particular, whats your take on this?

Diggerfreek · **Posted:** Fri Apr 10, 2009 11:52 pm

vmf wrote:

thats what i was thinking, but than it would one expensive sensor and all the require cirquitry would be expensive as hell as well. guys with fsms etc, diggerfreek in particular, whats your take on this?

Well to sum all of this up, the jeep knows best I guess... here you guys go

OPERATION
The change oil indicator gives an indication to the vehicle operator when a duty-cycle algorithm contained within the software of the Powertrain Control Module (PCM) determines that a recommended oil change interval has been attained. This indicator is controlled by the instrument cluster logic circuit based upon cluster programming and electronic messages received over the Controller Area Network (CAN) data bus from the PCM.

The change oil indicator function of the Vacuum Fluorescent Display (VFD) is completely controlled by the instrument cluster logic circuit, and that logic will only allow this indicator to operate when the instrument cluster receives a battery current input on the fused ignition switch output (run-start) circuit. Therefore, the VFD change oil indication will always be OFF when the ignition switch is in any position except ON or START. The instrument cluster will turn ON the change oil indicator for the following reasons:

Change Oil Indicator Lamp-On Message - Each time the ignition switch is turned to the ON position and the cluster receives an electronic change oil indicator lamp-ON message from the PCM indicating that a duty-cycle based recommended oil change interval has been attained, the change oil indicator will be illuminated for about three seconds, until the trip odometer reset switch button is depressed, or until the ignition switch is turned to the OFF position, whichever occurs first.
Change Oil Indicator Reset Procedure - Once an engine oil change has been completed, the PCM duty cycle counters can be reset using the following procedure. Turn the ignition switch to the ON position, but DO NOT start the engine. Slowly depress and release the accelerator pedal fully three times within ten seconds. Turn the ignition switch to the OFF position. If the change oil indicator illuminates the next time the engine is started, repeat this procedure.
The PCM continually monitors numerous sensor inputs to determine the duty-cycles to which the engine is being subjected. A pre-programmed algorithm within the PCM then determines when to send the proper lamp-ON or lamp-OFF message to the ElectroMechanical Instrument Cluster (EMIC) (also known as the Cab Compartment Node/CCN).

vmf · **Posted:** Sat Apr 11, 2009 8:35 am

thank you digger, so there is no specific sensor, but it actually monitors the way the car is used and it doesnt know when the oil was changed. thats good news.

hrogi · **Posted:** Sat Apr 11, 2009 11:26 am

This was a great thread.

I think we all learned allot without BS..

Digger can you take you info post and add it to the Tech section.

Title would be the same as this thread,

Bolding this section
"Change Oil Indicator Reset Procedure - Once an engine oil change has been completed, the PCM duty cycle counters can be reset using the following procedure. Turn the ignition switch to the ON position, but DO NOT start the engine. Slowly depress and release the accelerator pedal fully three times within ten seconds. Turn the ignition switch to the OFF position. If the change oil indicator illuminates the next time the engine is started, repeat this procedure.
"

This wil help many folks out maybe

Diggerfreek · **Posted:** Sat Apr 11, 2009 12:38 pm

Can do

Mike08Liberty · **Posted:** Sun Apr 12, 2009 4:35 am

hrogi wrote:

This was a great thread.

I think we all learned allot without BS..

Digger can you take you info post and add it to the Tech section.

Title would be the same as this thread,

Bolding this section
"Change Oil Indicator Reset Procedure - Once an engine oil change has been completed, the PCM duty cycle counters can be reset using the following procedure. Turn the ignition switch to the ON position, but DO NOT start the engine. Slowly depress and release the accelerator pedal fully three times within ten seconds. Turn the ignition switch to the OFF position. If the change oil indicator illuminates the next time the engine is started, repeat this procedure.
"

This wil help many folks out maybe

You can find out how to reset the light in your manual.

EVIC: oil change required message

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