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Mil Not Working

sonicii

By sonicii,
in V Series (V35, V36, V37 & Infiniti)

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sonicii Veteran

sonicii

Posted
Posted

I didn't even notice this light wasn't working until I tried to do an idle speed adjustment this morning (after cleaning the TB over the weekend).

According to the G35 user manual the 'service engine soon' light should come on for a few seconds when you turn on the ignition. mine doesn't... Can anyone else confirm this should happen?

I ran through the idle adjustment procedure blindly and it seemed to work, so I am guessing it is just the light that isn't working.. possibly been disconnected for some strange reason. Will have to investigate when I get the time.

Car runs great otherwise, so I hope it hasn't been disconnected by a previous owner to hide a fault.

On checking the G35 FSM, it is an LED, so it can't be a 'blown bulb', and LED failures are fairly rare.

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scotty nm35 Grand Master

scotty nm35

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Not 100% sure with the V35 but on the M35, if you cut the MIL wire from the ecu the car goes into limp mode. Its fairly easy to change the dash over and try it but youre too far away to come and borrow my spare. >_<

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sonicii Veteran

sonicii

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Thanks, I'm in Townsville, so a bit too far to call in and borrow a spare.. thanks for the offer though!

according to the FSM, the MIL LED is controlled by the 'unified meter control unit' built into the speedo cluster which communicates with the ECU via the CAN system.

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sonicii Veteran

sonicii

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Well, I dismantled the speedo cluster as far as I could this afternoon. The LED is surface mounted on the PCB, and to get to it you need to remove the gauge needles. I wasn't brave enough to do that, so I just put it all back together.

Have found other other weird thing after cleaning the throttle body over the weekend, when starting the car from cold, it will idle high, even after fully warming up (idles at around 1k rpm), and the throttle is very sensitive, after the engine warms up, if you shut it down, wait about 10 sec and start it again, it idles normally at around 700rpm and the throttle response is normal. I have run through the accel pedal closed position setup, throttle closed position setup and idle air flow set procedure, but I am still getting the same thing from a cold start.

The up side is the car is much easier to accelerate from a standing start (when idling normal) than it was before the clean, it used to be a fine line between stalling or reving too much when launching in 1st, now it is much easier.

Tried to order an Blazt II OBD cable today, but it seems their webpage is down.

Is there any way to check the ECU codes without a code reader?

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Commsman Veteran

Commsman

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Is there any way to check the ECU codes without a code reader?

http://www.skylinesaustralia.com/forums/topic/261557-ecu-fault-codes-the-easy-way/

G35_350Z_ClearingCodes.pdf

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Commsman Veteran

Commsman

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thanks, I guess without a working MIL, I am still out of luck.

Haha, oops sorry, I forgot what the original problem was. My favourite mechanic shop will check/clear my codes for free, so maybe ask around.

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sonicii Veteran

sonicii

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Found Conceptzperformance sells the Blazt OBD2 cables, just ordered one today, so that should allow me to read any codes and clear them if necessary.

Will be useful for our J31 Maxima too.

I finally got the idle adjustement procedure to run, I thought it had run earlier, but after allowing the car to cool down and starting it again, the idle was high again.

Apparently running this procedure manually is quite difficult even with a working MIL, timing is critical, I guess I just fluked it today.

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scotty nm35 Grand Master

scotty nm35

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Found Conceptzperformance sells the Blazt OBD2 cables, just ordered one today, so that should allow me to read any codes and clear them if necessary.

Will be useful for our J31 Maxima too.

I finally got the idle adjustement procedure to run, I thought it had run earlier, but after allowing the car to cool down and starting it again, the idle was high again.

Apparently running this procedure manually is quite difficult even with a working MIL, timing is critical, I guess I just fluked it today.

I find with my car, (which has the MIL up constantly due to an Emanage) I cant do a idle learn because it reverts back to 900 revs when I restart it. Im guessing you have the same issue. Can you get Nissan or someone with an obd2 reader that works to read the codes?

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sonicii Veteran

sonicii

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I was thinking of taking it to Nissan, but I am guessing they will charge for it. They charge to program a new key and that is about the same amount of work.

Now that I have the idle correct, there isn't anything else I am worried about, so I will just wait until the Blazt cable arrives and check for codes then.

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