Automatic Transmission System

DIAGNOSIS SYSTEM
The ECT system has built-in self-diagnostic functions. If the malfunction occurs in the system, the Electronic Control Unit (ECU) stores the malfunction code in memory and the O/D OFF (Overdrive OFF) indicator light blinks to inform the driver.

If a malfunction code is displayed during the diagnostic trouble code check, check the circuit listed for that code in the table.









DIAGNOSTIC TROUBLE CODE CHART
If a malfunction code is displayed during the diagnostic trouble code check, check the circuit listed for that code in the table above. The circuits indicated by * on the code chart can be inspected using the ECT checker.
*1: "O" mark means "O/D OFF" light blinks once per two seconds.
"X" mark means "O/D OFF" light never blinks.
*2: "O" mark means the ECU memorizes the malfunction code if the ECU detects the diag. trouble code detection condition.
*3: This indicates items for which "2 trip detection logic" is used. With this logic, when a logic malfunction is first detected, the malfunction is temporarily stored in the ECU memory. If the same malfunction is detected again during the second drive test, this second detection causes the "O/D OFF" light to blink. The 2 trip repeats the same mode a 2nd time. (However, the IG switch must be turned OFF between the 1st trip and 2nd trip.)





HINT:
- 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 outputs a malfunction code even though the "O/D OFF" indicator was not blinking, there is intermittent trouble. Check all the connectors 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 none record any diagnostic trouble code. It will, however, decide that the vehicle can be driven only in 1st and none of the other gears, so shifting upward will be prohibited.
- Codes 46, 62, 63 and 64 are limited to short or open circuits in the electrical system comprised of the solenoids, wire harnesses and connectors. The ECU is unable to detect mechanical trouble (sticking, for example) in the solenoid valves.