DTC 14 Auto-cruise Vacuum Pump Power Supply System

CIRCUIT OPERATION
This circuit supplies the power to the vacuum pump. The battery positive voltage is supplied to the auto-cruise control vacuum pump by turning on the transistor at terminal number 16 of the auto-cruise control-ECU. The conditions for turning on the transistor at terminal number 16 of the auto-cruise control-ECU are as follows.
Ignition switch "ON"
Auto-cruise control main switch "ON"
Stoplight switch ON
DTC SET CONDITIONS
None of the drive signals from release valve, control valve and motor of the auto-cruise vacuum pump are input to the auto-cruise control-ECU.
TROUBLESHOOTING HINTS
The most likely causes for this code to be set are:
Malfunction of the stoplight switch
Malfunction of the auto-cruise vacuum pump
Damaged harness or connector.
Malfunction of the auto-cruise control-ECU