Self Diagnostics for Automatic Transmissions


on Wednesday 14 November 2007
in A-Z Index - Everthing is listed in here > Transmission

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.