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(7) Auxiliary brake function
• The auxiliary brake function activates or deactivates the Powertard solenoid valve according to the vehicle condi-
tion to control the auxiliary brake.
(8) Idle-up function
• The idle-up function increases the engine idling speed when a load is applied to the engine by other system or
when the warm-up acceleration function is activated.
(9) Fault diagnosis function
• When the starter switch is in the ON position, the system continuously monitors the sensors and other system
components. If any fault is detected, the system warns the driver of this by displaying the relevant fault information
on the meter cluster. At the same time, the system also stores a relevant diagnosis code in the memory and starts
operation in the fault mode.
• While the control during fault is taking place, the system’s functionality is limited to ensure vehicle and driver safe-
ty. It is possible to read the memorized diagnosis code using a Multi-Use Tester or from flashing of the warning
lamp.
• Diagnosis codes shown by the Multi-Use Tester and those indicated by flashing of the warning lamp are different.
• The Multi-Use Tester is capable of showing more detailed diagnosis codes.
Accelerator pedal position sensor
Clutch switch
Transmission neutral switch
Powertard switch
Auxiliary brake
function
Powetard solenoid valve
Engine electronic
control unit
Input signals
Output signals
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