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Just as a bit of a sidetrack, I would be interested if you do work out the wiring, as we have an ls400 fan ecu in our hilux and it also appears to be different from the soarer info you linked too. We have our fan wired up to the fan ecu with a manual override switch. The fan ecu doesn't appear...

The solenoid is on the front of the fan's hydraulic pump, on the left side of the pulley (drivers left). Attached is a diagram of the pump that may help.

Ok, thanks guys that gives me a few places to start looking. I should have mentioned that the 28l/100km was worked out on very conservative highway driving not even doing 100kph most of the way (I was following someone) We have the standard Lexus auto with 4.88 diff ratios and 35" Simex tyres...

We have a ls400 1uz in our hilux that was wired up by a sparkie to the crown ecu. Fuel economy is currently at approx 28L/100km (or 10mpg) when driving conservatively, no diag codes. Where should I start looking? EDIT: I know of another 1uz hilux that was wired up by the same guy with the...

Yes, it runs at low speed all the time. Yes, the temp sensor is connected. No ECU doesn't smell, but I am guessing our sparky wired it up wrong. I have the wiring diagram for the SC400 fan ecu, and our one (LS400) is wired up very differently, so just wondering if they should be the same or not?

There's a bit of info here that might be helpful?

We have a LS400 fan ecu in our hilux which isn't working. I checked the plug according to the SC400 info given by Lambo here and it's wired completely different. Does anyone know if the LS400 and SC400 fan ecu are the same and/or have the same wiring? We know the fan is working fine as we have...

What's involved to switch the plugs, is it just a bolt-on job?