Precaution In Diagnosing Trouble

NOTES:
^ Transmission Control Module (TCM) has on-board diagnostic system (a system self-diagnosis function).
^ Investigate where the trouble is by referring to "Diagnostic Flow Chart" and "Diagnostic Trouble Code Table".





PRECAUTIONS IN IDENTIFYING DIAGNOSTIC TROUBLE CODE
- Before identifying diagnostic trouble code indicated by "O/D OFF" light, don't disconnect couplers from TCM, battery cable from battery, TCM ground wire harness from engine. Such disconnection will erase memorized trouble in TCM memory.
- The DTC stored in the TCM memory is output by flashing of "O/D OFF" light with the diagnosis switch terminal grounded.
- If no DTC is stored in the TCM memory, Code 12 is output repeatedly.
- If DTCs are stored in the TCM memory, they are output after Code 12 output starting from the smallest code number in the increasing order. After all DTCs are output, Code 12 is output again and so are DTCs.