Component Tests and General Diagnostics
FAIL-SAFE FUNCTION1. Cancelling function when CANCEL switch (signals) are in abnormal condition
- Group 1 switches: SET/COAST switch ON, RESUME/ACCEL switch ON and CANCEL switch ON.
- Group 2 switches: Brake switch OFF, Stop Light switch ON, Clutch switch OFF and Inhibitor switch ON
1. When at least one of the group 1 switches and one of the group 2 switches are operated simultaneously, the system is cancelled and held in the non-operating state. When the switches in groups 1 and 2 are turned from ON to OFF (except brake and clutch switches which are turned from OFF to ON) and then the switches in group 1 are turned ON, the system starts operation.
2. If the cruise main switch is turned ON with at least one switch in group 1 turned ON, the system does not operate and remains in that state until the cruise main switch is turned OFF.
2. Cancelling function when the system circuit is in abnormal condition
In the following states, the system is cancelled and the memorized speed is also cancelled. After cancellation of the system, the cancelling function is held until the IG switch or cruise main switch is turned OFF.
1. The vacuum motor terminal is grounded or opened. Or the vacuum motor driving circuit is shorted.
2. The air valve terminal is grounded or opened. Or the air valve driving circuit is shorted.
3. The release valve terminal is grounded or opened. Or the release valve driving circuit is shorted.
4. The vehicle speed signal varies more than 10 km/h (6 MPH) per 350 m sec.
5. The fused internal relay is detected while the vehicle is not in cruise control operation.
6. The internal circuit of the cruise control module stops its operation is in abnormal condition.
7. There is a difference between memorized cruise speeds stored in two RAMs inside the cruise control module.
8. There is a difference between values showing output from the two RAMs inside the cruise control module.