Check Mode Procedure

HINT:

Compared to normal mode, check mode is more sensitive to malfunctions and 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 ignition switch is turned from ON to 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
1. Check and ensure the following conditions:
  1. Positive (+) battery voltage 11 V or more
  2. Throttle valve fully closed
  3. Transmission in the P or N positions
  4. A/C switch OFF
2. Turn the ignition switch OFF.
3. Connect the intelligent tester to the DLC3.
4. Turn the ignition switch ON and turn the tester ON.
5. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / CHECK MODE.
6. Switch the ECM from normal mode to check mode.
  
  Fig 1: Connecting Intelligent Tester To DLC3
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
7. Make sure the MIL flashes as shown in the illustration.
8. Start the engine.
9. Make sure the MIL turns off.
10. Simulate the conditions of the malfunction described by the customer.
11. Check DTCs and freeze frame data using the tester.
  
  Fig 2: Malfunction Indicator Lamp Flashing Pattern
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002