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.

DTC CHECK
1. Initial conditions:
- Battery positive voltage 11 V or more.
- Throttle valve fully closed.
- Transmission in the PARK position.
- Air conditioning switched off.
2. Turn the ignition switch OFF.
3. Prepare the TOYOTA hand-held tester.
4. Connect the TOYOTA hand-held tester to DLC3 at the lower 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. (The MIL goes off 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 DTCs etc.

9. After simulating the malfunction conditions, use the TOYOTA hand-held tester diagnosis selector to check the DTCs and freezed 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.

DTC CLEARANCE
The following actions will erase the DTCs and freezed frame data. Operating the OBD II scan tool (complying with SAE J1978) or TOYOTA hand-held tester to erase the codes.

(See the OBD II scan tool's instruction book for operating instructions.)

NOTICE: If the TOYOTA hand-held tester switches the ECM from normal mode to check mode or vice-versa, or if the ignition switch is turned from ON to ACC or OFF during check mode, the DTCs and freezed frame date will be erased.








DLC3 INSPECTION
The vehicle's ECM uses V.P.W. (Variable Pulse Width) for communication to comply with SAE J1850. The terminal arrangement of DLC3 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 TOYOTA 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.
(1) If communication is normal when the tool is connected to another vehicle, inspect DLC3 on the original vehicle.
(2) 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.