Description of On-Board Diagnostics

SELF DIAGNOSTIC SYSTEM

NOTICE:
^ Low battery voltage will cause faulty operation of the diagnosis system. Therefore, always check for proper battery voltage before troubleshooting.
^ Use a VOM with an impedance of at least 10 k Ohms / Volt.

- A self-diagnosis function is built into the electrical control system.




- Warning is indicated by the O/D OFF indicator.
- If a malfunction occurs within the speed sensors or solenoids, the O/D OFF indicator light will blink to warn the driver.
- A malfunction in the lock-up solenoid circuit will produce a fault code, but the warning indicator will not flash.

HINT: Warning and diagnostic codes can be read only when the overdrive switch is ON (in). When the overdrive switch is in the OFF (out) position, the O/D OFF light is illuminated and will not flash.




- The diagnostic code can be read by the number of blinks of the O/D OFF indicator when terminals TE1 and E1 are short-circuited.

Voltage Output From Terminal TT Of DLC1 Should Step Up In 1 Volt Increments As The Transaxle Shifts Up:

- The throttle position sensor and brake signals do not generate fault codes but inspection can be made by checking the voltage at terminal TT of the check connector.

- The signals to each gear can be checked by measuring the voltage at terminal TT of the check connector while driving.

- The diagnostic (malfunction) code is retained in memory by the ECM and is not canceled out when the engine is turned off.

Remove The (15 Amp) EFI Fuse To Clear The Malfunction Codes:

- After repair, it is necessary to turn the ignition switch OFF and remove the (15 A) EFI fuse or disconnect the ECM connector to cancel out the diagnostic trouble codes.