Diagnosis System

The power management control ECU controls the cruise control system of the vehicle. The data and DTCs relating to the cruise control system can be read from the DLC3 of the vehicle. Use the Techstream to check and solve the problem.

HINT: 

If a vehicle speed sensor, stop light switch or any other related part malfunctions, the power management control ECU cancels cruise control operation automatically.

1. Check the DLC3. Refer to GENERAL INFORMATION .

1. Turn the power switch on (IG).
   TEXT IN ILLUSTRATION
   
   

   *1	Cruise Control Indicator Light

   Fig 1: Identifying Cruise Main Indicator Light

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Check that the cruise control indicator light illuminates when the cruise control system is turned on using the cruise control switch (ON-OFF button), and that the indicator light turns off when the cruise control system is turned off using the cruise control switch (ON-OFF button). If the results are not as specified, perform the Cruise Main Indicator Light Circuit (cruise control indicator) inspection procedure. Refer to Cruise Main Indicator Light Circuit .

   HINT: 

   While driving with the cruise control system controlling vehicle speed, the power management control ECU will automatically cancel cruise control system control of vehicle speed when a malfunction occurs in one of the following: vehicle speed sensors, stop light switch assembly, or other related parts. When control of vehicle speed by the cruise control system is automatically canceled, the cruise control indicator light blinks. At the same time, a DTC is stored.