Ford Electric Ranger 2001 Manual page 320

412-02-26
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
Q2 CHECK CLIMATE CONTROL VACUUM RESERVOIR SUPPLY
LINE CONNECTION
• Check the vacuum supply line to the climate control vacuum reservoir
for a secure connection.
• Is the vacuum supply line securely connected?
Q3 CHECK VACUUM RESERVOIR CHECK VALVE
• Disconnect the vacuum lines from the vacuum reservoir.
NOTE: Vacuum should remain constant when applied to the vacuum
reservoir port for the vacuum line leading to the passenger compartment
and there should be no vacuum when applied to the port for the vacuum
line leading to the vacuum tee assembly. Airflow through the check valve
should be in the direction towards the vacuum pump.
• Use Vacuum Tester to apply 103 kPa (15 psi) of vacuum to both ports
on the vacuum reservoir.
• Is the vacuum reservoir check valve OK?
Q4 CHECK CLIMATE CONTROL VACUUM RESERVOIR FOR
VACUUM LEAK
• With key ON, disconnect the vacuum line leading to the passenger
compartment from the climate control vacuum reservoir and plug the port
on the vacuum reservoir.
• Monitor interface adapter assembly (IAA) module PID VACPRES for a
change in vacuum pressure after the vacuum pump shuts off.
• Does the vacuum level remain constant?
Q5 CHECK VACUUM LINE TO PASSENGER COMPARTMENT
• With key ON, disconnect the vacuum line in the passenger compartment
located on the right side of the bulkhead and plug the port on the
bulkhead.
• Monitor IAA module PID VACPRES for a change in vacuum pressure
after the vacuum pump shuts off.
• Does the vacuum level remain constant?
Q6 CHECK BLACK VACUUM LINE TO MODE SELECT SWITCH
• With key ON, disconnect the vacuum connector from the mode select
switch and plug the black vacuum line on the vacuum connector.
• Monitor IAA module PID module VACPRES for a change in vacuum
pressure after the vacuum pump shuts off.
• Does the vacuum level remain constant?
Q7 CHECK BLACK VACUUM LINE IN VACUUM JUMPER
HARNESS
• With key ON, disconnect the vacuum jumper harness leading to the
heater plenum and plug the black vacuum line port on the heater plenum
vacuum connector.
• Monitor IAA module PID VACPRES for a change in vacuum pressure
after the vacuum pump shuts off.
• Does the vacuum level remain constant?
Q8 CHECK MODE SELECT SWITCH
(Continued)
Heating and Ventilation
TEST STEP ACTION TO TAKE
GO to Q3.
Yes =
No = RECONNECT the vacuum
supply line.
Yes = RECONNECT the vacuum
lines. GO to Q4.
No = REPLACE the climate
control vacuum reservoir.
Yes = RECONNECT the vacuum
line to the vacuum reservoir.
GO to Q5.
No = REPLACE the climate
control vacuum reservoir.
Yes = RECONNECT the vacuum
line to the bulkhead port.
GO to Q6.
No = REPLACE the vacuum line
between the climate control
vacuum reservoir and
bulkhead.
Yes = RECONNECT the vacuum
connector to the mode select
switch. GO to Q8.
No = GO to Q7.
Yes = REPLACE the vacuum
jumper harness.
No = REPLACE the heater
plenum vacuum line
assembly.
2001 Ranger EV, 01/2001
412-02-26