With Manufacturer's Scan Tool

DATA LINK CONNECTOR 3 INSPECTION
The vehicle's ECM uses V.P.W. (Variable Pulse Width) for communication to comply with SAE J1850. The terminal arrangement of DLC 3 complies with SAE J1962 and matches the V.P.W. format.

HINT: If your display shows "UNABLE TO CONNECT TO VEHICLE" when you have connected the cable of the LEXUS hand-held tester to DLC 3, 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 DLC 3 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.

DIAGNOSIS INSPECTION (Normal Mode)




Malfunction Indicator Lamp Check
1. The malfunction indicator lamp comes on when the ignition switch is turned ON and the engine is not running.

HINT: If the malfunction indicator lamp does not light up, troubleshoot the combination meter.

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

Diagnostic Trouble Code Check




NOTICE: When the diagnosis system is switched from normal mode to check mode, it erases all diagnostic trouble codes and freeze frame data recorded in normal mode. So before switching modes, always check the diagnostic trouble codes and freeze frame data, and note them down.

1. Prepare the LEXUS hand-held tester.
2. Connect the LEXUS hand-held tester to data link connector 3 in the fuse box at the lower left of the instrument panel.
3. Turn the ignition switch ON and turn the LEXUS hand-held tester switch ON.
4. Use the LEXUS hand-held tester to check the diagnostic trouble codes and freeze frame data, note them down.

DIAGNOSIS INSPECTION (Check Mode)
Compared to the normal mode, the check mode has an increased sensitivity to detect malfunctions. Furthermore, the same diagnostic items which are detected in the normal mode can also be detected in the check mode.

Diagnostic Trouble Code Check
1. Initial conditions.
- Battery positive voltage 11 Volts or more.
- Throttle valve fully closed.
- Transmission in park or neutral position.
- Air conditioning switched OFF.
2. Turn ignition switch OFF.
3. Prepare the LEXUS hand-held tester.




4. Connect the LEXUS hand-held tester to data link connector 3 in the fuse box at the lower left of the instrument panel.
5. Turn the ignition switch ON and switch the LEXUS hand-held tester ON.
6. Switch the LEXUS hand-held tester normal mode to check mode. (Check that the MIL flashes.)
7. Start the engine. (The MIL goes out after the engine start.)




8. Simulate the conditions of the malfunction described by the customer.

NOTICE: Leave the ignition switch ON until you have checked the diagnostic trouble codes, etc.

9. After simulating the malfunction conditions, use the LEXUS hand-held tester diagnosis selector to check the diagnostic trouble codes and freeze frame data, etc.

HINT: Take care not to turn the ignition switch OFF. Turning the ignition switch OFF switches the diagnosis system from check mode to normal mode, so all diagnostic codes, etc. are erased.

10. After checking the diagnostic trouble code, inspect the applicable circuit.