Trouble Diagnosis

Trouble diagnosis
Trouble code indication procedures:
1. Connect the diagnostic check harness (99731 Z0007) to the diagnostic switch.
2. Connect the open end of the diagnostic check harness to ground.







The way the diagnosis switch is shorted to ground is referred to as the dealer mode.
Current trouble code are indicated by the number of engine control warning light flashes while trouble codes experienced in the past are indicated by the number of over heat warning light flashes.







Engine Control warning light: displays present trouble







Overheat warning light: displays the past trouble (*)

NOTE:(*)
* To carry out analysis of past troubles, the system is equipped with a diagnostic memory function. This function stores in the memory any failure signals for abnormality that occurred during travel. It acts to replay these signals when carrying out analysis of the trouble.
The signals stored in the memory are retained even when the ignition key switch is turned OFF.

* Normally, the Overheat warning light lights up when the engine overheats or when the coolant level becomes too low. However, when the diagnostic switch is released, it displays the result of the diagnosis of past troubles in the MD-TICS system.
The overheat warning function is not incorporated in the control unit.