Check Mode

Toyota 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.
- By putting the vehicle's ECM in check mode, one trip detection logic is possible instead of 2 trip detection logic and sensitivity to detect open circuits is increased. This makes it easier to detect intermittent problems.

DTC CHECK
1. Initial conditions.
- Battery positive voltage 11.0 volts or more.
- Throttle valve fully closed.
- Transaxle in the P 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 in the fuse box at the lower left 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.
- Check that the MIL goes 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 DTCs, etc.
- Turning the ignition switch OFF switches the diagnosis system from check mode to normal mode, so all DTCs, etc. are erased.

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

10. If the ECM has recorded any DTCs, inspect the applicable circuit.
- Refer to the "Trouble Code Charts" under Diagnostic Charts.