Displaying & Reading Trouble Codes

NOTE: This is the only information provided by the manufacturer for reading Diagnostic Trouble Codes for this system.






1. DIAGNOSIS SYSTEM
a. Description
ECM controls the function of immobilizer on this vehicle. Data of the immobilizer or DTC can be read form DLC3 of the vehicle. When a trouble occurs on immobilizer, MIL does not light up but DTC inspection is performed.

Therefore when there seems to be a trouble on immobilizer, use LEXUS hand-held tester or SST to check and troubleshoot it.








b. Inspect the DLC3.
The vehicle's ECM uses ISO 9141-2 for communication.
The terminal arrangement of DLC3 complies with SAE J1962 and matches the ISO 9141-2 format.

HINT: If your display shows "UNABLE TO CONNECT TO VEHICLE" when you have connected the cable of OBD II scan tool or LEXUS hand-held tester to DLC3, turned the ignition switch ON and operated the scan tool, there is a problem on the vehicle side or tool side.
If communication is normal when the tool is connected to another vehicle, inspect DLC3 on the original vehicle.
If communication is still not possible when the tool is connected to another vehicle, the problem is probably in the tool itself, so consult the Service Department listed in the tool's instruction manual.

2. INSPECT DIAGNOSIS
a. Check the DTC (Using LEXUS hand-held tester).
1. Prepare the OBD II scan tool (complying with SAE J1978) or LEXUS hand-held tester.
2. Connect the OBD II scan tool or LEXUS hand-held tester to DLC3 under the instrument panel lower pad.
3. Turn the ignition switch ON and turn the OBD II scan tool or LEXUS hand-held tester switch ON.
4. Use the OBD II scan tool or LEXUS hand-held tester to check the DTCs and freeze 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.

b. Check the DTC (Using diagnosis check wire).




1. Turn ignition switch ON.
2. Using SST, connect between terminals 11 (TC) and 3 (E1) of DLC1.
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, 12 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.