Check Mode Procedure

HINT:

hand held tester only:

Compared to the normal mode, the check mode has more sensing ability to detect malfunctions. Furthermore, the same diagnostic items which are detected in the normal mode can also be detected in the check mode.

1. CHECK MODE PROCEDURE (Using the hand held tester) 
   1. Check the initial 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 hand held tester to the DLC3.
      Fig 1: Connecting Hand Held Tester With DLC3

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   4. Turn the ignition switch ON.
   5. Switch the hand held tester from the normal mode to the check mode (check that the MIL flashes).
      NOTE: If the hand held tester switches the ECM from the normal mode to the check mode or vice-versa, or if the ignition switch is turned from ON to ACC or OFF during the check mode, the DTC and freeze frame data will be erased.
   6. Start the engine (MIL goes off after the engine starts).
      Fig 2: Inspecting MIL Flashes

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   7. Simulate the conditions of the malfunction described by the customer.
      NOTE: Leave the ignition switch ON until you have checked the DTC, etc.
   8. After simulating the malfunction conditions, check the DTC and freeze frame data, etc. using the hand held tester diagnosis selector.

      HINT:

      Do not turn the ignition switch OFF, as turning it OFF switches the diagnosis system from the check mode to the normal mode, which erases all the DTCs, etc.

   9. After checking the DTC, inspect the applicable circuit.
2. CLEAR DTC (Using the OBD II scan tool or hand held tester) 
   1. Connect the OBD II scan tool or hand held tester to the DLC3.
   2. Turn the ignition switch ON.
   3. Operate the OBD II scan tool or hand held tester to erase the codes. All the DTCs and freeze frame data will be erased. (See the OBD II scan tool's instruction book for operating instructions.)
3. CLEAR DTC (Not using the OBD II scan tool or hand held tester) 
   1. Disconnect the battery terminal or remove the EFI fuse from the engine room R/B for more than 60 seconds.