2002 LC100 - Not Starting... ??? Fuel Pump ???

[Zmaila]

So I found that it is "EDU circuit".
I think that can wery well cause this issue either by malfunction or cold connection. I just did drive for an hour and no issue appear so far (that is not indicative as it can occur in day or one year or never again).
Might be usefull for anybody who experience this problem and rule out EFI fuse and relay. Inspect this control box/connector and also there is procedure in manual to verify its function by multimeter and so on.
Hope that help someone.
Below paragraph from manual:

CIRCUIT DESCRIPTION
The EDU has been adopted to drive the spill control valve at high speeds. The EDU has realized high−speed
driving under high fuel pressure conditions through the use of a DC/DC converter that provides a high−voltage,
quick−charging system.
The engine ECU constantly monitors the EDU and stops the engine in case an abnormal condition is detected.
The battery voltage is increased by the DC/DC converter. A voltage of approximately 150 V is applied to the
spill control valve in accordance with the IJ+ signal received from the engine ECU. Also at this time, the injection
verification signal (IJf) is sent to the engine ECU.

 

[Kam]

Installed a different Fuel Pump ECU and the cruiser fired right up... Now for a few days of testing

Hello, I was reading thru your thread here. Having a similar issues with my 98. I can run jumper wires to the back of the plug (FP- to E and
+B to FP+ and no wires to what would be DI and FPC) and the vehicle starts right up and will stay idling. So I believe the issue lies within DI & FPC. When you purchased your new FPC ECM did you have to reprogram the ECU? Or was this just plug and play? TYA!