Component Tests and General Diagnostics

INSPECT DIAGNOSIS (Normal Mode)

a. Check the DTC using LEXUS hand-held tester.

NOTE: 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 hand-held tester.
2. Connect the hand-held tester to DLC3.
3. Turn the ignition switch ON and push the hand-held tester main switch ON.
4. Use the hand-held tester to check the DTCs and freezed frame data, note them down (For operating instructions, see the hand-held tester instruction book.).
5. See Diagnostic Trouble Code Chart to confirm the details of the DTCs.

b. Check the DTC (Using diagnosis check wire)




1. Turn ignition switch ON, but do not start the engine.
2. Using SST, connect between terminals 13 (TC) and 4(CG) of DLC3.

SST 09843-18040







3. Read the diagnostic trouble code from malfunction indicator lamp.

HINT:
- If a diagnostic trouble code is not output, check the TC terminal circuit.
- ECM controls the immobilizer function on this vehicle, DTC is out put with engine data.
- As an example, the blinking patterns for codes; normal and 99 are shown in the charts.

4. When DTC "99", is output, there is a trouble of immobilizer. Start troubleshooting referring to PROBLEM SYMPTOMS TABLE.
5. After completing the check, disconnect terminals 13 (TC) and 4 (CG) and turn off the display.

HINT: In the event of 2 or more malfunction codes, indication will begin from the smaller numbered code and continue in order to the larger.

c. Clear the DTC.
The following operations will erase the DTCs and freeze frame data.
1. Hand-Held Tester:
Operating the LEXUS hand-held tester to erase the codes.
2. Except Hand-Held Tester:
Disconnecting the battery terminals or EFI fuse for 1 minutes or more.