Idle speed compensation, radiator fan

DICE sends bus information Current Consumption, unit On/Off. Bus information Current Consumption ON is sent 0.1 seconds before DICE activates the radiator fan.

Motronic puts B+ on pin 10 (K22) and when Current Consumption goes high, the main instrument unit will ground pin 10 (K22). In this way, Motronic compensates for the increased load in its idle speed control.

Fig 1: Idle Speed Compensation

Courtesy of SAAB-SCANIA OF AMERICA, INC.

Fig 2: Idle Speed Compensation Wiring

Courtesy of SAAB-SCANIA OF AMERICA, INC.