Check Mode

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.
- Transmission in PARK position.
- Air conditioning switched off.
2. Turn ignition switch OFF.





3. Prepare the TOYOTA hand-held tester.
4. Connect the TOYOTA hand-held tester to DLC 3 in the fuse box at the lower right of the instrument panel.
5. Turn the ignition switch ON and switch the TOYOTA hand-held tester ON.





6. Switch the TOYOTA hand-held tester from normal mode to check mode. (Check that the MIL flashes.)
7. Start the engine. (MIL and O/D OFF indicator light go off 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 DTCs etc.








9. After simulating the malfunction conditions, use the TOYOTA hand - held tester diagnosis selector to check the DTCs 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 DTCs, etc. are erased.

10. After checking the DTC, 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 J 1962 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 TOYOTA 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 impossible 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.