Displaying and Reading Trouble Codes

1. TURN IGNITION SWITCH AND OD SWITCH TO ON
Do not start the engine.

NOTE: Warning and diagnostic code can be read only when the overdrive switch is ON. If Off the overdrive light will light continuously and will not blink.





2. SHORT ECT Computer DG TERMINAL CIRCUIT Black and Yellow/Black wire
Using a service wire, short the DG terminal [Electronic Controlled Transmission computer (ECT Computer) terminal No. 24] and body ground.





3. READ DIAGNOSTIC CODE
Read the diagnostic code as indicated by the number of times the OD "OFF" light flashes.





4. DIAGNOSTIC CODE
1) If the system is operating normally, the light will blink 2 times per second.





2) In the event of a malfunction, the light will blink once a second. The number of blinks will equal the first number and, after 1.5 second pause, the second number of the two digit diagnostic code. If there are two or more codes, there will be a 2.5 second pause between each.

NOTE: In the event of several trouble codes occuring simultaneously, indication will begin from the smaller value and continue to the larger.

3) Remove the service wire from the DG terminal.

DIAGNOSTIC CODES





NOTE:
^ If codes 31, 32, 33 or 34 appear, there is an electrical malfunction in the solenoid. Causes due to mechanical failure, such as a stuck switch, will not appear.
^ If diagnostic code Nos. 21, 22, 23, 31, 32, 33 or 34 occur, the overdrive off indicator light will begin to blink immediately to warn the driver. However, an impact or shock may cause the blinking to stop; but the code will still be retained in the ECT computer memory until canceled out.
^ In the event of a simultaneous malfunction of both No. 1 and No. 2 speed sensors, no diagnostic code will appear and the fail-safe system will not function. However, when driving in the "D" range, the transmission will not upshift from first gear, regardless of the vehicle speed.