General information
1. The self-diagnosis function is built into the electronic control unit of the automatic transmission. Using the overdrive mode off indicator, the system can warn the driver about a malfunction in the automatic transmission. The code of the malfunction can be determined using the same indicator.
Note: Warning signals and reading of fault codes are possible only when the overdrive switch is in the "ON" position. If the switch is in the "OFF" position, the indicator lamp lights without flashing.
a) The fault codes can be read by the number of flashes of the upshift indicator; to do this, short-circuit the "TE1" and "E1" terminals of the diagnostic connector.
c) The diagnostic system does not detect failure of the throttle position sensor and brake light switch, but they can be checked by checking the voltage at the "TT" terminal of the diagnostic connector.
2. The fault code remains in the control unit memory even after the engine is turned off. Clearing the control unit memory (reset codes after repairs) is done either by turning off the ignition and disconnecting the "EFI" fuse, or by disconnecting the connector of the automatic transmission control unit and the engine.
Warning: Low battery voltage may cause diagnostic failure. Therefore, please check the battery before starting diagnostics.
Checking the Overdrive Off Indicator
1. Turn on the ignition.
2. The indicator should light when the overdrive switch is in the 'OFF' position.
3. Turn the overdrive switch to the "ON" position: the indicator should go out. If the indicator flashes, this indicates a malfunction in the electrical part of the control system.
Reading fault codes
1. Turn on the ignition and set the overdrive switch to the "ON" position.
Caution: Do not start the engine.
2. Short-circuit the "TE1" and "E1" terminals of the diagnostic connector.
3. Read and determine the fault code by the number of indicator blinks.
a) If two flashes occur per second, the system is working normally.
b) If there is one flash per second, there is a malfunction in the system. The code consists of two digits, the first digit is determined by the initial series of flashes, then there is a 1.5 second pause and a second series of flashes, which corresponds to the second digit of the code. If there are two or more malfunction codes, there will be a 2.5 second pause between them.
Note: If there are several fault codes, the lowest code is always displayed first, followed by the remaining codes in ascending order.
4. Disconnect terminals "TE1" and "E1".
Table. Error codes. A140E.
The text is taken from the specified website: ToyotaMAN.ru
Note: codes 62, 63, 64, 68 indicate a malfunction in the electrical part of the electromagnetic valves. Malfunctions in the mechanical part, such as valve sticking, are not recorded by the self-diagnosis system.
A540N.
Note: Codes 62, 63, 64 73 or 77 indicate a fault in the electrical part of the electromagnetic valves. Faults in the mechanical part, such as valve sticking, are not recorded by the self-diagnosis system.