Check Mode Procedure

HINT:

Intelligent tester only:

Compared to the normal mode, check mode is more sensitive to malfunctions. Therefore, check mode can detect the malfunctions that cannot be detected by normal mode.

NOTE: All the stored DTCs and freeze frame data are erased if: 1) the ECM is changed from normal mode to check mode or vice versa; or 2) the power switch is turned from ON (IG) to ON (ACC) or OFF while in check mode. Before changing modes, always check and make a note of any DTCs and freeze frame data.

CHECK MODE PROCEDURE (Using Intelligent Tester)
1. Check and ensure the following condition:
  1. Battery positive voltage 11 V or more.
  2. Throttle valve fully closed.
  3. Transmission in the P or N positions.
  4. A/C switched OFF.
2. Turn the power switch OFF.
3. Connect the intelligent tester to the DLC3.
  
  Fig 1: Connecting Intelligent Tester To DLC3
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
4. Turn the power switch ON (IG).
5. Turn the tester ON.
6. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / CHECK MODE.
7. Switch the ECM from normal mode to check mode.
8. Make sure the MIL flashes as shown in the illustration.
  
  Fig 2: Identifying MIL Flashes
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
9. Start the engine.
10. Make sure the MIL turns OFF.
11. Simulate the conditions of the malfunction described by the customer.
12. Check DTCs and freeze frame data using the tester.