Check Mode Procedure

HINT:

Hand held tester only:

Compared to 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 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 (Using a hand held tester)
1. Check and ensure the following conditions:
  1. Battery voltage 11V or more
  2. Throttle valve fully closed
  3. Transmission in the P or N positions
  4. A/C switched OFF
2. Turn the ignition switch to OFF.
3. Connect a hand held tester to the DLC3.
4. Turn the ignition switch to ON.
5. Turn the tester ON.
6. Select the following menu items: DIAGNOSIS / ENHANCED OBD II / CHECK MODE.
7. Switch the ECM from normal mode to check mode.
  
  Fig 1: Connecting Hand-Held Tester Or OBD II Scan Tool To DLC3
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
8. Make sure the MIL flashes as shown in the illustration.
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.
Fig 2: MIL Blinking Pattern
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002