Toyota MR2 Message Board - View Single Post

CJMR2T · 11-03-2009, 10:13 PM

Is your battery @ 12.6v or higher???

Are your connections on the battery Clean & Tight???

Is the ground cable from the battery Clean & Tight where it connects to the body???

If so, and your only getting 11.5v and @ the EFI fuse when checked against a good chassis ground, then you have a wiring issue between it and the battery...

You should get battery voltage At the fuse and at the ECU.

The ECU has nothing to do with a voltage drop up to it.

Whether the ECU is there of not, you should get battery voltage @ the BATT terminal on the ECU all the time and you should get battery voltage @ +B and +B1 with the key on.

If you are not getting Full battery voltage at those terminals, then you need to trace the circuits back to were you finally get Full battery voltage barring your battery connections and main ground connection (comming from the battery) is good.

11-03-2009, 10:13 PM	#18 (permalink)
CJMR2T Fabricator Join Date: Oct 2009 Location: Lakeland, FL Posts: 3,688 Thanks: 3 Thanked 355 Times in 336 Posts iTrader Rating: (4/100% )	Is your battery @ 12.6v or higher??? Are your connections on the battery Clean & Tight??? Is the ground cable from the battery Clean & Tight where it connects to the body??? If so, and your only getting 11.5v and @ the EFI fuse when checked against a good chassis ground, then you have a wiring issue between it and the battery... You should get battery voltage At the fuse and at the ECU. The ECU has nothing to do with a voltage drop up to it. Whether the ECU is there of not, you should get battery voltage @ the BATT terminal on the ECU all the time and you should get battery voltage @ +B and +B1 with the key on. If you are not getting Full battery voltage at those terminals, then you need to trace the circuits back to were you finally get Full battery voltage barring your battery connections and main ground connection (comming from the battery) is good.