popaige

I have read and responded to alot of comments on fuel pump ecu failers on the sc. Does anyone have any idea's why this has such a large failer rate? Fuel Pump? Main Ecu? Thanks

Thanks, I have the schematic and will take a look at it. If you can think of anything else all is welcome.

You just pull the bottom seats up with a quick jerk from the front. The backs of the seats are bolted at the bottom in two places . Once these are undone they have hooks at the top that you just lift up on the seat and it disengages.

I had bought my 93 sc300 and discovered that my fuel pump ecu had been by passed. I purchased a new one and had installed as I did not want to run the fuel pump at the high speed mode 100% of the time. This was fine for about 1000 miles and it went out again. So I by passed it and got one at the junk yard and installed it. I'll be dipped, this one went bad also. Any theory's on this problem. Maybe the fuel pump is shorting out the ecu?? Any advise is welcome.

The fuel pump can be forced to operate in the high voltage setting by placing a jumper in the engine diagnostics connector between FP and +B terminals (for location of terminals see the label inside the diagnostics connector cover). A straightened up paper clip can be used as a jumper but must be inserted very deep in the terminals. This function is useful for checking that the fuel pump is not faulty (it can be heard running with the ignition on) and also to make the car mobile in case the fuel pump ECU is faulty. We strongly advise against driving the car for prolonged periods with the jumper inserted as the current draw of the pump in its high setting is about 7.3A and the pump may not have been designed to handle the load permanently and may overheat and seize, creating more (expensive) problems. At idle and under light loads the engine may be running rich due to increased fuel pressure.

I have had the same problems with my 93 sc300. I took it to a shop the 1st time and they said they fuel ecu had been by passed for awhile. They replaced it with a new ecu and about 1000 miles later the car stalled out again. I by passed the fuel ecu and the car started right up. Any idea's what would make the ecu short out? Fuel pump maybe? Does the sc400 use the same ecu?