Service engine soon...

SouthArk370Z · 02-23-2017, 05:48 AM

Quote:

Originally Posted by nis350

I was under the impression that disconnecting the battery doesn't reset the ECU and/or clear the code/condition?

There are some capacitors in the ECM that will retain power for a little bit. If you leave the ECM unpowered for a few minutes or press on the brake pedal for a few seconds, the ECM will lose all volatile memory.

nis350 · 02-24-2017, 12:21 AM

Good info.

I recall you can clear warning light/code by pulling the clock fuse on some older cars. Is there a fuse that does that for the Z or disconnecting the battery is the only way?

Quote:

Originally Posted by SouthArk370Z

There are some capacitors in the ECM that will retain power for a little bit. If you leave the ECM unpowered for a few minutes or press on the brake pedal for a few seconds, the ECM will lose all volatile memory.

SouthArk370Z · 02-24-2017, 06:32 AM

Quote:

Originally Posted by nis350

... I recall you can clear warning light/code by pulling the clock fuse on some older cars. Is there a fuse that does that for the Z or disconnecting the battery is the only way?

Not that I've read about (there is probably an ECM fuse but it will be in the IPDM which can be a PITA to get to) and no.

The easiest way to clear DTCs is to use an OBD scanner.

WELL ZED · 03-06-2017, 02:20 PM

Quick update. Took it to Nissan and they just reset the code for me. Informed me that it looks like its nothing to be concerned with. Just a random code. After they reset it, idle returned back to normal. All good for now. Fingers crossed.

LuisVQ370 · 03-16-2017, 02:42 PM

OP has the light came back on since? mine recently started doing the same thing and was told it most likely is the spark plugs.

WELL ZED · 03-20-2017, 11:25 AM

Nope, nothing has come back on since. Looks like it really was a random P0300. Take it to Nissan and have them run it through a code reader, it could very well be your spark plugs. All they performed on mine was an "idle relearn", which is essentially just an ECU update

03-06-2017, 02:20 PM	#4 (permalink)
WELL ZED Base Member Join Date: May 2016 Location: Northern Virginia Posts: 83 Drives: #822 40th Rep Power: 9	Quick update. Took it to Nissan and they just reset the code for me. Informed me that it looks like its nothing to be concerned with. Just a random code. After they reset it, idle returned back to normal. All good for now. Fingers crossed. wideglideleon and Kris2fer like this.

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03-16-2017, 02:42 PM	#5 (permalink)
LuisVQ370 Base Member Join Date: May 2015 Location: Chicago,IL Posts: 2 Drives: 09 pearl white 370z Rep Power: 10	OP has the light came back on since? mine recently started doing the same thing and was told it most likely is the spark plugs.

03-20-2017, 11:25 AM	#6 (permalink)
WELL ZED Base Member Join Date: May 2016 Location: Northern Virginia Posts: 83 Drives: #822 40th Rep Power: 9	Nope, nothing has come back on since. Looks like it really was a random P0300. Take it to Nissan and have them run it through a code reader, it could very well be your spark plugs. All they performed on mine was an "idle relearn", which is essentially just an ECU update