Locate the tempostat fuse and check its condition (see Section Fuses and fuse links - general information).
Ask an assistant to depress the foot brake pedal several times - the operation of the brake light sensor-switch that reacts to depressing the pedal should lead to the deactivation of the tempostat.
If the brake lights do not respond to pressing the pedal, find out the cause of the failure and repeat the check of the tempostat functioning.
Visually assess the condition of the drive cable routed from the servomotor/tempostat booster assembly to the throttle linkage. Replace damaged or worn cable. If necessary, adjust the cable, which is done in the same way as adjusting the throttle cable (see chapter Power and exhaust systems).
The functioning of the tempostat is based on monitoring the signals of the vehicle speed sensor. The speed sensor is placed in the transmission, a description of the check of its functioning is given in the Chapter Engine management systems this guide.
Description of the procedure for checking the main (On off) tempostat switch is given in Section Check of serviceability of functioning and replacement of switches of the panel of devices.
The tempostat operation control switch is installed on the steering wheel of the vehicle.
To check the switch, refer to the materials of Section Check of serviceability of functioning and replacement of understeering switches. Replace the failed assembly.
Note. Before proceeding to check the tempostat, make sure that the horn is working properly, through the relay of which power is supplied to the system.
Carry out a road test of the vehicle. If it was not possible to eliminate the malfunction of the tempostat during the corrections made, drive the car to a service station for a more detailed diagnosis of the system using special equipment.