Displaying & Reading Trouble Codes

Overdrive Switch:

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

- Turn ignition switch and O/D switch to ON.
- Do not start the engine.

Jumper Installation:

- Using a service wire, short terminals Tt and E1 of the check connector.
- Read the diagnostic code as indicated by the number of times the O/D OFF indicator flashes.

Normal Indication:

- If the system is operating normally, the light will blink once every 0.25 seconds.

Malfunction Indication:

- In the event of a malfunction, the light will blink once every 0.5 seconds. The number of blinks will equal the first number and, after 1.5 seconds pause, the second number of the two digit diagnostic code. If there are two or more codes, there will be a 2.5 seconds pause between each. Indication will begin from the smaller value and continue to the larger.