Check Mode Procedure

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

Fig 1: Identifying EFI & ETCS Fuses

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1. Ensure the following conditions:
   1. Battery positive voltage 11 V or more
   2. Throttle valve fully closed
   3. Transmission in the P or N position
   4. A/C switched off
2. Turn the ignition switch off.
3. Connect the intelligent tester together with the Controller Area Network Vehicle Interface Module (CAN VIM) to the DLC3.
4. Turn the ignition switch to the ON position.
5. Enter the following menus: DIAGNOSIS / ENHANCED OBD II./ CHECK MODE.
   Fig 2: Connecting Intelligent Tester To DLC3

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6. Change the ECM to check mode. Make sure the MIL flashes as shown in Fig 3.
   NOTE: All recorded DTCs and freeze frame data will be erased if: 1) the intelligent 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 LOCK.
   Before entering check mode, make notes of the DTCs and freeze frame data.
   Fig 3: Identifying MIL Flashes Pattern

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
7. Start the engine. The MIL should turn off after the engine starts.
8. Perform "MONITOR DRIVE PATTERN" for the ECT test (See MONITOR DRIVE PATTERN  ).

   (Or, simulate the conditions of the malfunction described by the customer).

9. After simulating the malfunction conditions, use the intelligent tester diagnosis selector to check the DTC and freeze frame data.