Adjust the engine idle speed periodically on the engine at normal operating temperature.
To adjust the idle speed:

Engine oil and filter change
Throtile cable playDTC “c49” (p1656): pair control solenoid
valve circuit malfunction
Detected condition and possible cause
Detected condition
Possible cause
Pair control solenoid valve voltage is not input to ecm
Pair control solenoid valve circuit open or short.
Pair control solenoid valve malfunction.
Ecm malfunction.
...
Specifications
Service data
Wattage
unit: w
Tightening torque specifications
Reference: for the tightening torque of fastener not specified in this
section, refer to “tightening torque list” in section 0c . ...
Sds check
Using sds, sample the data at the time of new and periodic vehicle
inspections.
After saving the sampled data in the computer, file them by model and by user.
The periodically filed data help improve the accuracy of troubleshooting since
they can indicate the condition of vehicle
function ...