Cruise Control Inoperative/Malfunctioning
Diagnostic Aids

Important
Perform the following in order to avoid misdiagnosis.

Inspect for proper operation of brake lamps.
Inspect throttle linkage for mechanical binding which could cause the system
to malfunction.
Inspect cruise control cable adjustment, should have minimum slack.
When testing vehicles equipped with steering wheel controls, the steering
wheel must be rotated to each stop position while testing the cruise control
switch signal circuits. This will assure the integrity of the SIR coil.
EMI on the speed sensor signal circuit may cause erratic cruise control
operation.

Conditions for Enabling Cruise Control
When vehicle speed is more than 40 km/h (25 mph)
When PARK, REVERSE, NEUTRAL, or 1st gear is not indicated
When an over/undercharged battery condition does not exist
With normal engine RPM
Without high engine RPM fuel cut-off