Diagnosis Inspection (Check Mode)

NOTICE: (LEXUS hand-held tester only) Compared to the normal mode, the check mode has high sensing ability 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 V or more.
- Throttle valve fully closed.
- Transaxle in PARK 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 check mode. (Check that the MIL flashes.)
7. Start the engine. (MIL and O/D OFF indicator light go out after the engine starts.)
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.







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 OBD II scan tool or 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.