Toyota Corolla (E170) 2014–2019 Owners Manual / Driving / Using the driving support systems / Cruise control / Adjusting the set speed
Toyota Corolla (E170): Adjusting the set speed
To change the set speed, operate the lever until the desired set speed is obtained.
1 Increases the speed 2 Decreases the speed
Fine adjustment: Momentarily move the lever in the desired direction.
Large adjustment: Hold the lever in the desired direction.
The set speed will be increased or decreased as follows: Fine adjustment: By approximately 1 mph (1.6 km/h) each time the lever is operated.
Large adjustment: The set speed can be increased or decreased continually until the lever is released.

Other materials:
For vehicles equipped with catalytic converter
Caution:
if large amount of unburned fuel flows into the converter, it may cause
overheating and a fire hazard.
To prevent this, observe the following precautions.
Use only unleaded gasoline.
avoid prolonged idling.
Avoid running the engine at idle speed for more than 20 minutes. ...
How to proceed with troubleshooting
1 Vehicle brought in
2 Customer problem analysis check and symptom check
3 Problem symptoms table
Without applicable symptoms, proceed to ”a”
with applicable symptoms, proceed to ”b”
4 Perform troubleshooting in the following method, depending on
malfunction symptom ...
On–vehicle inspection
1. Inspect speedometer
check the operation.
Using a speedometer tester, inspect the speedometer fro allowable
indication error and check
the operation of the odometer.
Reference:
Notice:
tire wear and tire over or under inflation will increase the indication error.
...


