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Home >> Toyota >> 2004 >> Matrix Base, 4WD >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System (SFI) - Diagnostics (1ZZ-FE) >> Check Mode Procedure
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Check Mode Procedure

NOTE:

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 To DLC3
      G02914402Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Turn the ignition switch ON.
      5. 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.
      Fig 2: Identifying Time Duration Between Pulses
      G02914403Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    5. Switch the hand-held tester from the normal mode to the check mode (check that the MIL flashes).
    6. Start the engine (MIL goes off after the engine starts).
      7. NOTE: Leave the ignition switch ON until you have checked the DTC, etc.
    7. Simulate the conditions of the malfunction described by the customer.
      8. NOTE:

      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.

    8. After simulating the malfunction conditions, check the DTC and freeze frame data, etc. using the hand-held tester diagnosis selector.
    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.
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