Diagnosis (Normal Mode)

INSPECT DIAGNOSIS (Normal Mode)




a. Check the MIL

1. The MIL comes on when the ignition switch is turned ON and the engine is not running.

HINT: If the MIL does not light up, troubleshoot the combination meter.

2. When the engine started, the MIL should go off. If the lamp remains on, the diagnosis system has detected a malfunction or abnormality in the system.

b. Check the DTC.

NOTE:
- If there is no DTC in the normal mode, check the 1st trip DTC using Continuous Test Result function (Mode 7 for SAE J1979) or the TOYOTA hand-held tester or OBD II scan tool.
- TOYOTA hand-held tester only:
When the diagnosis system is switched from normal mode to check mode, it erases all DTCs and freezed frame data recorded in normal mode. So before switching modes, always check the DTCs and freezed frame data, and note them down.

1. Prepare the TOYOTA hand-held tester or OBD II scan tool (complying with SAE J1978).
2. Connect the TOYOTA hand-held tester or OBD II scan tool to DLC3 under the instrument panel lower pad.
3. Turn the ignition switch ON and turn the TOYOTA hand-held tester or OBD II scan tool switch ON.
4. Use the TOYOTA hand-held tester or OBD II scan tool to check the DTCs and freezed frame data; note them down. (For operating instructions, see the OBD II scan tool's instruction book.)
5. See Trouble Code Descriptions to confirm the details of the DTCs.

NOTE:
- When simulating symptoms with an OBD II scan tool (excluding TOYOTA hand-held tester) to check the DTCs, use normal mode. For code on the DTC chart subject to "2 trip detection logic", perform the following either action.
- Turn the ignition switch OFF after the symptom is simulated the first time. Then repeat the simulation process again. When the problem has been simulated twice, the MIL lights up and the DTCs are recorded in the ECM.
- Check the 1st trip DTC using Mode 7 (Continuous Test Results) for SAE J1979.

c. Clear the DTC.
The DTCs and freezed frame data will be erased by either action.
1. Operating the TOYOTA hand-held tester or OBD II scan tool (complying with SAE J1978) to erase the codes. (See the OBD II scan tool's instruction book for operating instructions.)
2. Disconnecting the battery terminals or EFI fuse.

NOTE: If the TOYOTA 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 check mode, the DTCs and freezed frame data will be erased.