Engine Light On

APV ROY · February 18, 2003

: HAVE A CODE P1125 =(throttle control motor circuit malfunction) went threw the tests replaced throttle motor new,test wiring okay ,sent out the ECM for repair not by lexus threw a another company said they could fix it

put computer in and still same problem am not sure if you can fix these ECM.

clear codes throttle works for a few seconds then engine light comes on and traction control light comes on

no throttle

what next (new computer) or ?

mile 40,721 3.0L

THANKS ROY

lexussport · February 18, 2003

Roy,

What DTC does it show? 89 or 21?

Cheers

Dave

APV ROY · February 21, 2003

Dave,

what do you mean by 89 or 21?

thanks Roy

lexussport · February 21, 2003

Roy,

I have the lexus manual for the GS, and it says:- (DTC Diagnostic Trouble Code)

"If the DTC No 89 is indicated on the check engine warning light read the DTC for ETCS, from ECT SNOW indicator (ExceptG.C.C)/ ETCS indicator (only for G.C.C) to get detail of the DTC No 89. If use the hand-held tester, the detail DTC for ETCS are displayed by the hand-held tester."

It talks about ETCS trouble code 21, however looking at it again this morning I can see that 89 and 21 mean the same thing (damm).

I would guess at either a short or open circuit in the wiring to the ECU or the ECU itself, Can you not borrow one from another GS to see what happens?

Dave

supraman7 · April 10, 2003

I had a similiar problem and after replacing the "Throttle Position Sensor", it hasn't reoccurred in the past year.

joboggi · June 16, 2008

This looks like a good place for this.

We have a 1996 Lexus GS 300. Today the Traction control warning light, and the ABS warning light both came on. The car started running rough.

This is the first problem ever, with this car.

Please advise.

ColinBarber · June 16, 2008

This looks like a good place for this.
We have a 1996 Lexus GS 300. Today the Traction control warning light, and the ABS warning light both came on. The car started running rough.

This is the first problem ever, with this car.

Please advise.

That may well be the throttle position sensor. The series I doesn't have electronic throttle so there are less things to go wrong.