Pre - Check

1. DIAGNOSIS SYSTEM
   1. Check the DLC3.

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

2. INSPECT DIAGNOSIS 
   1. Check the DTC using SST check wire.
      1. Turn the ignition switch ON, but do not start the engine.
      2. When checking DTC 99: Using SST, connect terminal 13 (TC) and 4 (CG) of DLC3.
      3. When checking except DTC 99: Using SST, connect terminals 8 (OP3) and 4 (CG) of DLC3.

         SST 09843-18040

         Fig 1: Identifying CG, (OP3) And (CG) Terminals Of DLC3

         Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      4. Read the DTC indicated by the number of times the security indicator light or the MIL blinks.
         NOTE:

         • If the DTC is not output, inspect the diagnosis circuit and security indicator light circuit (See SECURITY INDICATOR LIGHT CIRCUIT , DIAGNOSIS CIRCUIT ).
         • If the system is operating normally, the light blinks 2 times per second.
         • As an example, the blinking patterns of normal code 12 and code 99 are shown on the left and on the next section.
         Fig 2: Identifying Blinking Patterns Of Normal Code 12 And Code 99

         Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
         Fig 3: Identifying Blinking Patterns Of Malfunction Code 12 And Code 99

         Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      5. When DTC "99" is output, there is a trouble of immobilizer. Start troubleshooting referring to PROBLEM SYMPTOMS TABLE.
      6. After completing the check, disconnect terminals 8 (OP3) or terminals 13 (TC) and 4 (CG), and turn off the display.
         NOTE: If 2 or more malfunction codes exist, indication will begin from the smaller numbered code and continue in order to the larger.
   2. Clear the DTC.
      1. When using diagnosis check wire:
         • Remove the ECU-B fuse and EFI No.2 fuse from engine room J/B for 1 minutes or more.

MEMO