Check Mode Procedure

HINT:

Check mode has a higher sensitivity to malfunctions and can detect malfunction that normal mode cannot detect. Check mode can also detect all the malfunctions that normal mode can detect. In check mode, DTCs are detected with 1 - trip detection logic.

1. DTC CHECK (CHECK MODE) 

   HINT:

   Techstream only: Compared to the normal mode, the check mode is more sensitive for detecting malfunctions. Furthermore, the same diagnostic items which are detected in the normal mode can also be detected in the check mode.

   1. Procedure for Check Mode using the Techstream.
      1. Check the initial conditions.
         • Battery positive voltage 11 V or more
         • Throttle valve fully closed
         • Transmission in the P or N position
         • A/C switch is off
      2. Turn the engine switch off.
      3. Connect the Techstream to the DLC3.
      4. Turn the engine switch on (IG) and turn the Techstream main switch ON.
      5. Enter the following menus: Powertrain / Engine and ECT / Utility / Check Mode.
         NOTE: All DTCs and freeze frame data recorded will be erased if: 1) Techstream is used to change the ECM from normal mode to check mode or vice-versa; or 2) during check mode, the engine switch is turned from the on (IG) to on (ACC) or turned OFF.
      6. Start the engine (the MIL goes off after the engine starts).
         Fig 1: Identifying MIL Flashes

         Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      7. Perform "MONITOR DRIVE PATTERN" for the ECT test (See MONITOR DRIVE PATTERN  ), or simulate the conditions of the malfunction described by the customer.
         NOTE: Leave the engine switch on (IG) until you have checked the DTCs, etc.
      8. After simulating malfunction conditions, use the Techstream diagnosis selector to check the DTCs and freeze frame data, etc.
      9. When you use Techstream: Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
      10. After checking the DTC, inspect the applicable circuit.
      11. (See DIAGNOSTIC TROUBLE CODE CHART  ) to confirm the details of the DTCs.
2. DTC CLEAR 
   1. Connect the Techstream to the DLC3.
   2. Turn the engine switch on (IG) and turn the Techstream main switch ON.
   3. When you use Techstream: Enter the following menus: Powertrain / Engine and ECT / Trouble Codes / Clear.

      HINT:

      When operating Techstream to erase the codes, the DTCs and freeze frame data will be erased. (See the Techstream instruction book for operating instructions.)