Im trying to figure out what electrical problems I could have with my A/T, what code should I have on the A/T ecu sticker? Its a 1989/1990 jap import. If its not the ecu, what other problems would cause the A/T to only select 1st and 2nd 70% of the time. If I pull off in 2nd gear it will move up a gear but if I pull of in normal mode ie 1st gear it will change up to 2nd but not 3rd??

 

Any help would be very much appreciated.

To begin a diag it is best to take a short drive 2 or 3 miles to ensure full working temperature has been obtained first.and then switch OFF the engine

 

 

With overdrive switch in on position and lever in P switch on ignition but do not start engine,the A/T lamp should lit up for about two seconds then go out.

 

 

Switch off the ignition and move selector lever to D also switch OFF the overdrive, switch the ignition ON but do not start the car.

 

 

With the ignition still ON and after more than 2 seconds move the lever to 2 follow this by switching the overdrive switch ON.Then

move the lever to 1, and set the overdrive switch to OFF.

 

 

Still with the ignition on depress the accelerator pedal fully and release it. The A/T check light will now flash the appropriate blink

code as deatiled below. After this to retrurn to normal switchOFF the ignition and move lever to P and set the overdrive back ON.

 

 

 

 

Fault codes are read as follows: A long flash indicates the start and is not to be counted

 

 

 

 

One long flash and No 1 blink long rest normal = Revolution sensor circuit fault

 

 

One long flash and No 2 blink long rest normal = Speed sensor circuit fault

 

 

One long flash and No 3 blink long rest normal = Throttle sensor circuit fault

 

 

One long flash and No 4 blink long rest normal = Shift solenoid `A` fault

 

 

One long flash and No 5 blink long rest normal = Shift Solenoid "B" fault

 

 

One long flash and No 6 blink long rest normal = Overrun clutch solenoid fault

 

 

One long flash and No 7 blink long rest normal = Lock up solenoid fault

 

 

One long flash and No 8 blink long rest normal = Gearbox fluid temerature sensor circuit fault

 

 

One long flash and No 9 blink long rest normal = Engine revolution sensor circuit fault

 

 

One long flash and No10 blink long restnormal . = Line pressure solenoid circuit fault

 

 

One long flash and 10 equall length blinks...... = All clear

 

 

NOTE

If when attempting this test no A/T check lamp operation a system check of the inhibitor switch,overdrive switch,kickdown switch or idle switch circuit will be required

 

 

all info courtsy (copy & pasted) from zedworld.co.uk on this page http://www.zedworld.co.uk/wizzj.html

hope this helps, not entirly sure it is i direct answer to the question.

 

jamie.