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The ECU uses the temperature of the coolant to know if the engine has warmed up. Obviously if the ECU coolant sensor is reporting the temp is higher than it is or is sending erratic signals the ECU will keep trying to lower the idle as it thinks it is hotter than what it really is.

bump, in the wrong area or what?

Have you checked that the ECU coolant temp sensor is operating within correct range? I had very similar issues with my ls400 and replacing it fixed the problem. Under the Engine RH coil (In my celsior).

I dont have a service history for my celsior, so this is what i'm planning for 105,000km's to try and reset it: - Spark plugs - New leads (Check ignition coils) - Check rotor/distributor caps (Replace if worn) - Oil filter/Oil - Clean out ISCV I've already rebuilt the powersteering pump...

Any updates, i've still been looking around. Can someone at least point me in the right direction for the important km's? Such as the 100,000 and 150,000 marks? Cheers...

G'day, Mainly looking to find out the service intervals and what is done at each interval. Can't get a ls400 from the lexus dealer as they are all tied upto the VIN of the vehicle. Had a search and couldnt find anything but i might just have worded it the wrong way. Wanting to either purchase a...

G'day, 1989 Toyoa Clesior Stock Everything Only code its throwing is 19 for TRAC otherwise fine. Since then its done similar things, throttle body is as new, Just changed the ECU temp sensor as old was a bit dodge it its output, just trying to fix radiator to test whole system. Maybe the car...

Cheers, i'll have a look in those areas when i clean the throttle body out.

G'day, Traction control was playing up with the TRC light lit up in tacho. Appears to be not working, or only working extremely randomly. Everything else throws no codes, this throws a 19. 19 - TRAC motor ON and OFF operation is higher than a predetermined number of times (accumulator...

Wow an old thread revived. Yeah, very interested in the mods you've done on your air in and out to achieve 184rwkw with your ls400. Cheers

Cheers, thanks for that info, looks like the sensor is a bit sick so i'll order a new one. Now my lights appear not to want to come on. The feeling of impending doom is starting to occur. I can put highbeams on, and the normal ones sometimes come on when i tell them too. Meaning their fuse...

Ok i flushed the radiator, and installed a new thermostat and it only displays about 4 lines up from Cold (same as before). I think that the celsiors hydraulic fans come on when i turn the car on which is a bit of a problem. I'm not sure that it could keep it that cold? Maybe as it is winter...

G'day, Another exciting development with the 1uz... Drove it 500+km's yesterday and it was happy as a 1uz could be, also took it out for a small drive last night and was fine. Today is another story. Started it up and would turn over but die. Started it up and held revs at 1300ish with...

Ok ended up being a thermostat that wouldnt shut duh... Quite surprising but oh well, now i can start working on the electrical gremlins. Cheers

G'day, I have a 1989 celsior with 98,000km's on it. What i'm querying is the temp guage's reading?> It only goes up about 4 lines. From what i understand i must check the thermostat, the sensor and the gauge. As well as to see if the hyrdraulic fan is constantly on. After the car 'warms' up it...