SC-5A Checking For a Speed Control Denied Message

Diagnostic Chart:

CHECKING FOR A SPEED CONTROL DENIED MESSAGE

Perform TEST SC-1A Before Proceeding

At this time the speed control switch and servo functions appear to operate properly. Using the DRB, monitor the speed control "cutout" status. Road test the vehicle at speeds over 30 mph and attempt to set the speed control. The following items will not allow the speed control to set. The last or most recent cause for speed control not to set is indicated by the "Denied" status.

Denied Message

ON/OFF The powertrain control module does not see an "ON"
signal from the switch at cavity 41.

SPEED The vehicle speed as seen by the powertrain control
module at cavity 66 is not greater than 36 mph.

RPM The engine rpm is excessive high.

BRAKE The brake switch sense circuit is open indicating to
the powertrain control module that the brakes are
applied. The sense circuit, cavity 62 of the PCM, is
grounded through the brake pedal switch when the brakes
are released.

P/N The park/neutral switch sense circuit is grounded
indicating to the powertrain control module that the
transmission is not in gear. The sense circuit, cavity
76 of the PCM, is grounded trough the park/neutral
switch when the transmission is in park or neutral.

RPM/SPD The PCM senses excessive engine rpm for a given vehicle
speed.

SOL FLT The powertrain control module senses a servo solenoid
circuit trouble code that is maturing or set in memory.