Thursday, March 04, 2010 - 04:53 pm, by: Joe Russell(Joe_r)
Hi guys, After "maintaining the TPS" the car developed a rather bad hesitation, when the accelerator is pushed to the floor. It stutters, there is large induction noise, it slowly revs, then it's fine once the revs build up. Once it gets to about 3000revs it goes nuts, literally, and revs extremely fast. Kick down no longer works, and it changes up gears very early. Diagnostics: ECT NG 38 EFI NG 21, 28, 41 ABS OK SUS NG 73 TRC NG(Not fitted) A/D OK
Slower depressing of the throttle is fine. Both oxygen sensors were replaced with new universal 1-wire ones a couple of months ago, when that error code popped up(21 &28), and the error is still there. Two second hand TPS units have been tried with the thought they were good, but it's coming up with the same code(41) so I still have all three. Suspension has been playing up lately.
Tried a new battery and new earth and cleaned earth etc. Going to rebuild the alternator this weekend if all goes well.
NOTE: I am currently using a celsior ecu, as the previous one was faulty, and as soon as the celsior one was installed it displayed an ECT fault(ECT 38). Any ideas what is going on? The car seems to be running hot(even though the temp sensor says its fine) and rich so I will do the thermostat and fuel filter I think. Fuel pump seems to make a bit of noise as well.
Thursday, March 04, 2010 - 07:13 pm, by: Joe Russell(Joe_r)
Will do. This is pretty much the ecu I have:
Same pin out, but it doesn't fit in the factory area, as its larger than the Soarer ecu. Found that out when I went to fit it Mine has Celsior written on it by the wrecker.
Thursday, March 04, 2010 - 07:17 pm, by: Joe Russell(Joe_r)
Matt-I've reset the ecu more times than I can remember, and when we did the O2 sensors, they were new, the earth was off the battery when they were installed too. Could be faulty wiring, I doubt the O2 sensors are stuffed, I think the originals were probably ok too, as they seems to have about the same roving outputs at the diagnostic port.
Since your getting hesitation and stuttering the problem lies deeper than the o2 sensors.
Have you tested the temperature sensors resistance? remember there is different temp sensors for the Gauge and ECU, so you cant go by looking at the gauge.
Maybe it could be a problem with the replacement ECU such as bad capacitors, you could try another ECU?
Find out the descriptions for the error codes you are getting and work from there.
Friday, March 05, 2010 - 04:18 pm, by: Joe Russell(Joe_r)
I have thought about doing the temp sensor, a lot of it points to that, and the ecu. How do you check it, and where? If you read the first post again Boris it's got a description of the codes I can find details for, just buried within
Thursday, March 18, 2010 - 02:45 pm, by: Joe Russell(Joe_r)
So I fixed my hesitation. Turns out there was air in the coolant system, approximately 1 litre. Needed to be filled at the temp sender on top of the engine. And now, no hesitation However, gear changes are still a problem as is kickdown, and the ect fault is still up. Have yet to do diagnostics to see what else is there.
Evan Kaio DieHard Beautiful sunny good @ rugby 'Canes' country '91 UZZ31. 92 TT
Joe as for the lack of Kickdown there may be a problem with the Solenoids in the box, but first you'll have to check for the ECT error codes and any other error codes there are other than ECT.
I do know that Error 41 for the EFI is the throttle position sensor. I am getting the same error in my Celsior and I have no Kickdown. By any chance could the Automatic box be going into limp mode whenever a TPS error is present thus giving no kickdown?
Thursday, March 18, 2010 - 06:51 pm, by: Joe Russell(Joe_r)
That's my thought Boris, auto seems to have wimped out Latest codes, after a reset and drive: ECT NG 38 EFI NG 41 (got rid of the O2 errors(21,28), may be related to temp sensor) ABS OK SUS NG 13 14 73 TRC NG(Not fitted) A/D OK
No idea what ECT 38 is. Or Sus 13, 14 or 73. I had 11 and 12 as well before I reset and went for a drive, so that would seem to me to be the wheel sensors. I have been having problems with the rear and/or right being low. Possibly the aftermarket controller.
Haha Evan I just posted the same thing in my WTB thread, good old toyodiy. I am having a hell of a problem finding one in NZ that's actually a Soarer one, I may ask for one to borrow just to see if it sorts anything.
Joe so changing your coolant fixed the hesitation? How would changing coolant fix the hesitation?
As for the kickdown problem it's either related to the box requiring a TPS reading for full throttle to kick down? But Error 38 for the Box you have to find out what that means.
I thought it would be the same error codes for all Toyota's but seems to be different.
Sunday, March 21, 2010 - 07:24 pm, by: Joe Russell(Joe_r)
Joe Russell wrote on Thursday, March 18, 2010 - 02:45 pm:
So I fixed my hesitation. Turns out there was air in the coolant system, approximately 1 litre. Needed to be filled at the temp sender on top of the engine.
Didn't change coolant, just put more water in. Got even more air out today, and found a hairline crack in my radiator filler tank around the level sender, I think its getting in there. The water temp sensor was sensing how hot it was, retarding the timing and pumping loads of fuel in.
Can't find error 38. Did find this though:
Transmission OBDI Diagnostic Codes
42 - No. 1 speed sensor signal malfunction
46 - Open or short circuit in no. 4 solenoid valve
61 - No. 2 speed sensor signal malfunction
62 - Open or short circuit in no. 1 solenoid valve
63 - Open or short circuit in no. 2 solenoid valve
64 - Open or short circuit in no. 3 solenoid valve
67 - OD direct clutch speed sensor signal malfunction
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