Troubleshooting

[Durandal]

OK the electrical connection to that cluster of telltale lights is bad and after taking it apart and taking out the LED's and putting them back in on whats left of the copper coating, I got them working.

Bad news is I do have 2 error codes

14 and 42

14 is Ignition signal, I don't know about this one and doesn't seem like a problem to me so I think I will clear it and see if it comes back.

42 is Speed Sensor, I'm pretty sure the speed sensor is on its way out just due to how its been acting and from what I hear is a common thing to go bad.

I just got to figure out a way to keep the check engine cluster from losing electrical connection.

[pwpanas]

Originally Posted by Durandal

OK the electrical connection to that cluster of telltale lights is bad and after taking it apart and taking out the LED's and putting them back in on whats left of the copper coating, I got them working.

Originally Posted by Durandal

Bad news is I do have 2 error codes

14 and 42

14 is Ignition signal, I don't know about this one and doesn't seem like a problem to me so I think I will clear it and see if it comes back.

42 is Speed Sensor, I'm pretty sure the speed sensor is on its way out just due to how its been acting and from what I hear is a common thing to go bad.

I just got to figure out a way to keep the check engine cluster from losing electrical connection.

Regarding the speed sensor signal, it's possible the problem is with the oem odometer cluster. Note these instructions are for the USDM-spec Mkiv-TT:

• Remove the dash trim that houses the Odometer, on the odometer harness find the pink wire and cut it then splice the pink wire with the blue and red VSS input wire.
• First try resolder the cold solder points on the board.

More info here:
http://www.mkiv.com/techarticles/trac_off_mil_odo/index.html

[Durandal]

Pulled the Check Engine light cluster out again to inspect the connections once more and I did find that some of the solder joints had broke off. After re-soldering them the telltale lights work fine.

When I started the supra up today it made some rattling and choking noises than preceded to rev from 500 RPM to 1500 RPM. I definitely need to look into the speed sensor fault more.

*Edit: I reset the ECU and then took it for spin to see if anything came back up. After driving it for about 10 mins and putting it through all the gears except 6, the engine light came on along with the warning light. I brought it back to the house to check the ECU code. I noticed it randomly revving up and down a bit while I let it run for about 2 mins before shutting it off.

Only Code 42 came back up after checking the ECU.

*Edit2: After doing a lot of reading on many different supra forums I have come to the conclusion the speed signal is getting lost in the buffer that happens in the ODO. I'm going to touch-up solder all my connections on the ODO cluster tomorrow and see if it gets resolved. If not I will just bypass the buffer by cutting the pink wire as Phil has mentioned.

[Durandal]

Cleaned up all my solder connections in my ODO and took it for a long test drive. I did not have any warning lights come on or code 42.

I was running low on gas so I filled up at what used to be a shell station where I got V-Power gasoline. After I had completely filled the tank I realized it wasn't shell anymore and the pumps were Ultramar. I had got the 91 Octane Supreme fuel. Will this be all right for my Supra? The reason I'm asking is 5 minutes later right in front of my house the car stalled.

Also on the way back I tried the cruise control. Pushed in the button the light came on and I clicked it down to set the speed and took my foot of the gas and it did not maintain speed. Is my cruise not working or am I missing something in the operation.

[pwpanas]

Originally Posted by Durandal

...Also on the way back I tried the cruise control. Pushed in the button the light came on and I clicked it down to set the speed and took my foot of the gas and it did not maintain speed. Is my cruise not working or am I missing something in the operation.

Try holding it down for a few seconds (i.e. not just a click)...and be sure you're over 40mph.

Originally Posted by Durandal

...*Edit2: After doing a lot of reading on many different supra forums I have come to the conclusion the speed signal is getting lost in the buffer that happens in the ODO. I'm going to touch-up solder all my connections on the ODO cluster tomorrow and see if it gets resolved. If not I will just bypass the buffer by cutting the pink wire as Phil has mentioned.

Um....my post above mentioned more than just cutting the pink wire, right? Either way, I'm glad that the ODO turned out to be the problem - hopefully my post (and not just the "many other supra forums" you read) helped you to isolate it.

[mnewxv]

91 octane shouldnt have any bad side effects. its spec.

[Durandal]

Um....my post above mentioned more than just cutting the pink wire, right? Either way, I'm glad that the ODO turned out to be the problem - hopefully my post (and not just the "many other supra forums" you read) helped you to isolate it.

Yah I cut the pink wire coming out of the connector and spliced it to the red/blue one to bypass the ODO buffering thing. Your post was where I first read about bypassing the ODO buffer circuit and just tying the speed sensor directly to the cruise,PSteer,AS and electronic idling. I was looking on other supra forums to try and find a high volume of people with this exact problem and see if this was a test and tried fix.

On a side note when I did have my ODO cluster off I noticed on the very bottom right hand corner of the ODO display was a burn mark from within the sealed plastic display. Looking through the side of it I could see an electrical component but I don't know what it is.

*Edit: Took the car out for a test run this morning after the ODO wire fix. Cruise control works (just had to hold it down for about 5 seconds like you said). Active fron spoiler works automatically at 90km/h. Also I have not been able to reproduce the error 42 while going up hills or load driving . Now I just need to clean her up and get some new rubber stops for the hatch. The ones in there now are the originals and are old and hard and bumps make the hatch rattle.

One question about the slip diff. (think its called TRAC in the USDM's). When I turn the ignition on for the telltale light test, I get two Lights related to slip diff.

Slip On
Slip Off

When I push the button to turn the slip off the lgiht comes on which is good. When I leave slip on I don't get a slip on light though. Does this light only come on when the slip diff kicks in?