Description of On-Board Diagnostics

DIAGNOSIS SYSTEM

a. Description
ECM controls the function of the cruise control on a vehicle. Data stored in the cruise control and on the DTC can be read from the DLC3 on the vehicle. If CRUISE MAIN indicator light does not come on after the DTC check, there is a malfunction of the cruise control.
Use the hand-held tester or SST to check and solve the problem.