Check Mode Procedure

HINT:

Techstream only:

Compared to the 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 Techstream)
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 Techstream to the DLC3.
4. Turn the ignition switch ACC.
5. Turn the tester ON.
6. Enter the following menus: 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.
Fig 1: Identifying Blinking Pattern
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