Description - cruise control (ENGINE MANAGEMENT SYSTEM - V8) (page 3 of 11)

ENGINE MANAGEMENT SYSTEM - V8

DESCRIPTION AND OPERATION 18-2-65

SLABS ECU

The SLABS ECU provides the road speed signal to the cruise control ECU.  This is the same speed signal provided 
to the ECM.  Cruise control will only operate between 28 - 125 mph (45 - 200 km/h).  Cruise control will not operate if 
a road speed signal is not present.

Input/Output

The input from the SLABS ECU to the cruise control ECU is a square wave oscillating between 0 - 12 Volts at a 
frequency of 8,000 pulses per mile (1.6 km).

ECU operating parameters (connector connected and cruise control master switch on)

Pin No.

Condition

Volts

Ohms

15

Road wheels stopped

0

15

Road wheels turning

0 - 12 Volts with a  

frequency of 8,000 

pulses per mile 1.6 km)