Diagnosis System

1. Inspect the battery voltage.
   1. Battery voltage:  11 to 14 V

   If voltage is below 11 V, recharge the battery before proceeding.

2. Check the DLC3.

   The vehicle's skid control ECU uses ISO 9141-2 for communication. The terminal arrangement of the DLC3 complies with SAE J1962 and matches with the ISO 9141-2 format.

   Fig 1: Identifying Connector DLC3

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Verify conditions listed in Fig 2 :

   Fig 2: Verifying Conditions Chart

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

HINT:

If the hand-held tester displays "UNABLE TO CONNECT TO VEHICLE" when the cable of the hand-held tester is properly connected to the DLC3, the ignition switch is turned to the ON position and the tester is operated, there is either a problem on the vehicle side or tester side.

• If communication is normal when the tester is connected to another vehicle, inspect the DLC3 on the original vehicle.
• If communication is still not possible when the tool is connected to another vehicle, the problem is probably in the tester itself. In this case, consult the Service Department listed in the tester's instruction manual.

1. Turn the ignition switch to the OFF position.
2. When the ignition switch is turned to the ON position, the lamp should come on for 3 to 4 seconds and then go off.

HINT:

If the tire pressure warning lamp has a defect, check the tire pressure warning lamp output patterns and the problem symptoms table (see PROBLEM SYMPTOMS TABLE ).

Fig 3: Checking Tire Pressure Warning Lamp Output Patterns

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 4: Tire Pressure Warning Lamp Chart (1 Of 2)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 5: Tire Pressure Warning Lamp Chart (2 Of 2)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

HINT:

When the skid control ECU does not operate properly, the ABS warning lamp comes on as an ABS system malfunction.