TEST
ACTION
APPLICABILITY
34
Turn the ignition off.
Disconnect the Speed Control Resume/Accel Switch harness connector.
Note: Check connectors - Clean/repair as necessary.
Measure the resistance of the Sensor Ground Circuit from the S/C Resume/Accel
harness connector to a good ground.
Is the resistance below 5.0 ohms?
All
Yes
→
Go To
35
No
→
Repair the open sensor ground circuit, right S/C switch connector
to the clockspring connector.
Perform POWERTRAIN VERIFICATION TEST VER - 4.
35
Start the engine.
Allow engine to idle for 1 minute.
Turn the engine off, then turn the ignition on, engine not running.
With the DRBIII
t, actuate the Speed Control Servo Solenoids.
Does the Throttle open and close?
All
Yes
→
Go To
36
No
→
Perform Speed Control Vacuum Supply Test per appropriate
service procedure.
Perform POWERTRAIN VERIFICATION TEST VER - 4.
36
At this time the Speed Control Switch and Servo functions appear to operate
properly.
Using the DRBIII
t, monitor the Speed Control OUTPUT status.
Road test the Vehicle at speeds over 35 MPH (55kmh) 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.
If ON/OFF Denied message is indicated, the Powertrain Control Module does not see
an ON signal from the Switch.
If SPEED Denied message is indicated, the Vehicle Speed as seen by the Powertrain
Control Module is not greater than 36 MPH.
If RPM Denied message is indicated, the Engine RPM is excessively high.
If BRAKE Denied message is indicated, the Brake Switch Sense Circuit is open
indicating to the PCM that the Brakes are applied. The Sense Circuit is grounded
through the Brake Pedal Switch when the brakes are released.
If P/N Denied message is indicated, Park/Neutral Switch Sense Circuit is grounded
indicating to PCM that Transmission is not in gear. The Sense Circuit is grounded
through the P/N Switch when Transmission is in Park or Neutral.
If RPM/SPD Denied message is indicated, the PCM senses excessive Engine RPM for
a given Vehicle speed.
If SOL FLT Denied message is indicated, the Powertrain Control Module senses a
Servo Solenoid Circuit trouble code that is maturing or set in memory.
Continue if the previous instructions have been completed.
All
Repair
Go To
37
229
SPEED CONTROL
*CHECKING SPEED CONTROL OPERATION WITH NO DTC’S PRESENT
—
Continued