DTC Check (Check Mode)

LEXUS HAND-HELD TESTER only
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.


DTC CHECK
1. Initial conditions.
- Battery positive voltage 11 V 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 DLC3 in the fuse box at the lower left of the instrument panel.
5. Turn the ignition switch ON and push the LEXUS hand-held tester main switch 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 DTCs etc.

9. After simulating the malfunction conditions, use the LEXUS 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 diagnostic codes, etc. are erased.

10. After checking the DTCs, inspect the applicable circuit.