Automatic Transmission System

DIAGNOSTIC CODE

HINT:
- The O/D OFF indicator light does not blink for the malfunction of the code 68 even when it occurs. However, the code is stored in memory.

- If the malfunction returns to normal while a malfunction warning is being output, the O/D OFF indicator light stops blinking and goes off. However, the malfunction code is retained in memory until it is cleared from memory.

- If the diagnosis system yields a code other than NORMAL even though the O/D OFF indicator was not blinking, there is intermittent trouble. Check all the connections in the circuits corresponding to that code.

- If speed sensors No.1 and No.2 happen to fail simultaneously, the ECU will neither alert the driver by blinking the O/D OFF indicator nor record any diagnostic code. It will, however, decide that the vehicle can be driven only in 1st and none of the other gears; shifting upward will then be prohibited.

- Codes 46, 62, 63, and 64 are limited to short or open circuits in the electrical system comprised of the solenoids, wire harness, and connectors. The ECU is unable to detect mechanical trouble (sticking, for example) in the solenoid valves.

- If No.3 solenoid valve (for lockup clutch control) fails, the ECU will not blink the O/D OFF indicator to alert the driver. It will, however, record the failure as code 64, which may be displayed during troubleshooting.