Oil Temp Gauge issue

BettyZ

The capacitors will discharge if you unhook the pos/neg on the batt, pump the brakes a few times, and leave it disconnected overnight.

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SouthArk370Z

No, no, no. Shorting the cables can cause too much current inside the ECM, BCM, TCM, etc, when the capacitors discharge through a dead short. Can probably get away with it 100 times before it bites you in the *** - but why take a chance?

This is the way to do it - it discharges the capacitors through a load (the brake lamps) not a dead short. It only takes stepping on the brake pedal for a few seconds, you don't have to let it sit overnight. Pos or neg post - doesn't have to be both.

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Rusty

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Wiesbaden

Hey, you all are unbelievable. I really appreciate the advice. I absolutely love my Z and don't want anything that I can prevent happening to her. I am able to replace engines, clutches, brakes, distributor's, water pumps, alternators, etc but the electrical/computer components on cars now is quite a bit more in depth then it used to be. Again, Thank you!! Replacing battery in the morning and will do as you guys suggested and see if it fixes the problem.

Wiesbaden

Hi, just wanted to update on status of oil temp gauge. I did the suggestions
you all posted. Replaced the battery, brake pedal discharge, etc. Let car sit overnight and it still did not work. Called dealership and told them to order the gauge cluster with an appointment the following week when the part came in. Well, guess what happened next? Went out to drive the car and the gauge worked. Popped right up and went to its normal position when cold. Registered temp when car warmed up to operating temp. It has now been operating as it should. Hopefully it keeps working. Any thoughts?

SouthArk370Z

My guess would be a wiring problem, eg, dirty connector, frayed wire.

Edit: Wiring diagrams, harness routing, etc are in the FSM if you want to do your own troubleshooting. Link in my sig.

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Steering Lock Links - Search The370Z Bookmarklet - FSM @ NICOclub
Mankind has progressed past the need for war but we haven't evolved that far. - NachoMahma

Wiesbaden

Thanks again!! If I find anything out I will post in case someone else runs into a similar problem.

Wiesbaden

Update: No problems with gauge since checking sensor, replacing battery and discharging system. Never brought the car back to the dealership to replace the gauges.

ZoomZ

ECU's are a funny bunch. Often it takes a few drives and miles while the ECU "re-learns" and resets.

I have learned to be very patient when it comes to electrical things and ECU's in cars, specially Nissans. From the early OBDI in my 1996 D21 P/U to my 06'Xterra, 13' Murano and 17' 370Z. They can be a headache, but predictable.

I drove that D21 Hardbody for 350,000KM's and 21 years the only CEL I got was for an O2 sensor. Sometimes simplicity is best policy. Never changed a light bulb on that truck!!!