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Check Mode Procedure

Compared to normal mode, check mode is more sensitive to malfunctions. Therefore, check mode can detect the malfunctions that cannot be detected in 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 note any DTCs and freeze frame data.
  1. CHECK MODE PROCEDURE 
    1. Check and ensure the following conditions:
      1. Battery voltage 11 V or more.
      2. Throttle valve fully closed.
      3. Transmission in the P or N (neutral) position.
      4. A/C switch OFF.
    2. Turn the ignition switch to OFF.
    3. Connect a Techstream to the DLC3.
    4. Turn the ignition switch to ON.
    5. Turn the tester ON.
    6. Select the following menu items: Powertrain / Engine and ECT / Utility / Check Mode.
    7. Switch the ECM from normal mode to check mode.
    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.
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