Toyota MR2 Message Board - View Single Post

mr220v · 02-07-2007, 04:06 PM

My problem is that i'm not getting any ecu activity at all. I have no problem turning over (thats the easy part).

When you first turn the ignition on, your check engine light comes on with it. I'm not getting this, which leads me to believe that the ecu is not functional.

Starting and running aside, just to get the ecu to power up and show activity only requires the two power supply wires (BATT and +B), the ground wires (E1, EO1, and EO2) and the warning light (W).

So, i'm down to the problem being one of three basic things:

1. Bad ecu
2. Bad ecu plug pinning (due to my error, or the pinouts not matching up with the ecu)
3. The beams ecu doesn't que the check engine light when the accessories are first turned on (this would be a first for a toyota), and everything is really ok.

02-07-2007, 04:06 PM	#14 (permalink)
mr220v Beams Owners Group Join Date: Mar 2006 Posts: 2,529 Thanks: 13 Thanked 176 Times in 147 Posts iTrader Rating: (11/100% )	My problem is that i'm not getting any ecu activity at all. I have no problem turning over (thats the easy part). When you first turn the ignition on, your check engine light comes on with it. I'm not getting this, which leads me to believe that the ecu is not functional. Starting and running aside, just to get the ecu to power up and show activity only requires the two power supply wires (BATT and +B), the ground wires (E1, EO1, and EO2) and the warning light (W). So, i'm down to the problem being one of three basic things: 1. Bad ecu 2. Bad ecu plug pinning (due to my error, or the pinouts not matching up with the ecu) 3. The beams ecu doesn't que the check engine light when the accessories are first turned on (this would be a first for a toyota), and everything is really ok.