Ford 2001 Ranger, Manual

Page: 322 / 1218

412-02-28 412-02-28 Heating and Ventilation
DIAGNOSIS AND TESTING (Continued)
PINPOINT TEST Q: VACUUM PUMP CYCLES ON AND OFF WITHOUT BRAKE PEDAL ACTIVATION
(CLIMATE CONTROL VACUUM SYSTEM LEAK TEST)/INCORRECT AIRFLOW THROUGH CLIMATE
CONTROL OUTLETS
TEST STEP ACTION TO TAKE
•
With key ON, remove the blue vacuum line from the floor/defrost door Yes = RECONNECT the blue
vacuum motor and plug the vacuum line. vacuum line to the
floor/defrost door vacuum
motor. GO to Q16.
•
Monitor IAA module PID VACPRES for a change in vacuum pressure No = REPLACE the heater
after the vacuum pump shuts off. plenum vacuum line
•
Does the vacuum level remain constant?
assembly.
Q16 CHECK RED VACUUM LINE TO PANEL/DEFROST DOOR
VACUUM MOTOR
•
With key ON, set the mode select knob to the PANEL/FLOOR position, Yes = RECONNECT the red
remove the red vacuum line from the panel/defrost door vacuum motor vacuum line to the
and plug the vacuum line. panel/defrost door vacuum
motor. GO to Q17.
•
Monitor IAA module PID VACPRES for a change in vacuum pressure No = REPLACE the heater
after the vacuum pump shuts off. plenum vacuum line
•
Does the vacuum level remain constant?
assembly.
Q17 CHECK GREEN VACUUM LINE TO RECIRCULATION
VACUUM SOLENOID
•
With key ON, set the mode select knob to the OFF position, disconnect Yes = System OK. CHECK for
the green vacuum line from the recirculation vacuum solenoid, and plug intermittent vacuum line
the vacuum line. connections.
•
Monitor IAA module PID VACPRES for a change in vacuum pressure No = REPLACE the heater
after the vacuum pump shuts off. plenum vacuum line
•
Does the vacuum level remain constant?
assembly.
PINPOINT TEST R: RECIRCULATION FUNCTION DOES NOT OPERATE
TEST STEP ACTION TO TAKE
R1 CHECK RECIRCULATION FUNCTION (FRESH POSITION)
•
With key ON, set the mode select knob to the PANEL/FLOOR position Yes = GO to R3.
and check the position of the outside/recirculation door.
•
Is the outside/recirculation door in the fresh position?
No = GO to R2.
R2 CHECK FRESH/RECIRCULATION DOOR VACUUM MOTOR
ACTUATOR
•
With key ON, set the mode select knob to the PANEL/FLOOR position, Yes = GO to R3.
disconnect the white vacuum line from the fresh/recirculation door
vacuum motor, and check the position of the outside/recirculation door.
•
Is the outside/recirculation door in the fresh position?
No = CHECK for binding
actuator/linkage. If OK,
CHECK for stuck
recirculation vacuum
solenoid. REPAIR as
necessary.
R3 CHECK RECIRCULATION FUNCTION (RECIRCULATION
POSITION)
NOTE: If the LED on the fresh/recirculation select switch does not
Yes = System OK. CHECK
illuminate when the fresh/recirculation select switch is depressed, GO to
wiring/vacuum lines for
R17.
intermittent connections.
•
With key ON, set the mode select knob to the PANEL/FLOOR position,
depress the fresh/recirculation select switch, and check the position of the
outside/recirculation door.
(Continued)
2001 Ranger EV, 01/2001