Check Mode Procedure

Check mode has a higher sensitivity to malfunctions and can detect malfunctions that normal mode cannot. Check mode can also detect all the malfunctions that normal mode can detect. In check mode, DTCs are detected with 1 trip detection logic.

1. Check that all of the following conditions are met:
   1. Battery positive voltage is 11 V or more
   2. Throttle valve is fully closed
   3. Shift lever is on P or N
   4. A/C is turned OFF
2. Turn the ignition switch OFF.
3. Connect the hand-held tester to the DLC3.
4. Turn the ignition switch ON.
5. Enter the following menus: DIAGNOSIS / ENHANCED OBD II/CHECK MODE.
   Fig 1: Connecting Hand-Held Tester To DLC3 (2 Of 2)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
6. Change the ECM to check mode. Make sure the MIL flashes as shown in Fig 2.
   NOTE: All DTCs and freeze frame data recorded will be erased if: 1) the hand-held tester is used to change the ECM from normal mode to check mode or vice-versa; or 2) during check mode, the ignition switch is turned from ON to ACC or OFF.
   Before check mode, make notes of the DTCs and freeze frame data.
   Fig 2: Identifying Blinking Pattern

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
7. Start the engine. The MIL turns off after the engine starts.
8. Simulate the conditions of the malfunction described by the customer.
9. After simulating the malfunction conditions, use the hand-held tester to check the DTCs and freeze frame data.