Chrysler PT Cruiser 2001 Service Manual Supplement page 2679

*CHECKING SPEED CONTROL OPERATION WITH NO DTC'S PRESENT
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Continued
TEST
3 With the DRBIII , read the S/C DENIED status.
Road test the Vehicle at speeds over 56 kmh (35 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.
If ON/OFF Denied message is indicated, the PCM does not see an ON signal from the
S/C 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.
Was there a S/C DENIED message seen during road test and DRBIII monitoring?
Yes → Go To 4
→ Go To 5
No
4 Turn the ignition on.
With the DRBIII in Inputs/Outputs, read the PARK NEUTRAL POSIT state.
While observing the display, move the Gear Selector to DRIVE.
Does the DRBIII display D/R?
Yes → Go To 5
→ Refer to the Transmission category and perform the Checking
No
5 Turn the ignition off.
Disconnect the Speed Control Switch harness connector.
Remove the ASD relay and connect a jumper wire between cavity 30 and cavity 87.
Turn the ignition on.
Measure the voltage of the Speed Control Switch Sense circuit in the Speed Control
Switch connector.
Is the voltage above 6.0 volts?
Yes → Repair the Speed Control Switch Signal Circuit for a short to
→ Go To 6
No
ACTION
Park/Neutral Switch Operation symptom.
Perform POWERTRAIN VERIFICATION TEST VER - 4.
voltage.
Perform POWERTRAIN VERIFICATION TEST VER - 4.
219
SPEED CONTROL
APPLICABILITY
SPEED CONTROL
SPEED CONTROL
SPEED CONTROL