Check Mode Procedure

HINT:

Intelligent 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 the intelligent tester)
1. Check and ensure the following conditions:
  1. Positive (+) battery voltage of 11 V or more.
  2. Throttle valve fully closed.
  3. Transmission in the P or N position.
  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.
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 1: MIL Flash Pattern
  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.
CLEAR DTC (Using the intelligent tester)
1. Connect the intelligent tester to the DLC3.
2. Turn the ignition switch to ON.
3. Erase DTCs and freeze frame data with the OBD II scan tool (complying with SAE J1978) or the intelligent tester. For the intelligent tester: 1) enter the following menus: DIAGNOSIS ENHANCED OBD II / DTC INFO / CLEAR CODES; and 2) press YES.
CLEAR DTC (Not using the intelligent tester)
1. Remove the EFI and ETCS fuse from the engine room R/B for more than 60 seconds, or disconnect the battery terminal for more than 60 seconds. When disconnecting the battery terminal, perform the "INITIALIZE" procedure.