Ford Electric Ranger 2001 Manual page 156

206-07-7
DIAGNOSIS AND TESTING (Continued)
PINPOINT TEST C: VACUUM PUMP CYCLES ON AND OFF WITHOUT BRAKE PEDAL OR CLIMATE
CONTROL ACTIVATION (VACUUM SYSTEM LEAK TEST)
C1 CHECK SYSTEM FOR VACUUM LEAKS
• Retrieve diagnostic trouble codes (DTCs) from the interface adapter
assembly (IAA) module.
• Does DTC C1777 Vacuum Pressure Circuit Failure occur?
C2 CHECK VACUUM LINE TO VACUUM LINE JOINT
CONNECTION
• With key ON, disconnect the vacuum line joint connection between the
vacuum tee assembly and climate control vacuum reservoir and plug the
vacuum line leading to the vacuum tee assembly.
• Monitor the IAA module PID VACPRES for change in vacuum pressure
after the vacuum pump shuts off.
• Does the vacuum level remain constant?
C3 CHECK VACUUM LINE BETWEEN CLIMATE CONTROL
VACUUM RESERVOIR AND VACUUM LINE JOINT CONNECTION
• With key ON, disconnect the vacuum line to the climate control vacuum
reservoir and plug the vacuum line.
• Monitor the IAA module PID VACPRES for change in vacuum pressure
after the vacuum pump shuts off.
• Does the vacuum level remain constant?
C4 CHECK VACUUM LINE BETWEEN VACUUM LINE JOINT
CONNECTION AND VACUUM TEE ASSEMBLY
• With key ON, disconnect the vacuum line leading to the vacuum line
joint connection from the vacuum tee assembly and plug the vacuum tee
assembly.
• Monitor the IAA module PID VACPRES for change in vacuum pressure
after the vacuum pump shuts off.
• Does the vacuum level remain constant?
C5 CHECK BRAKE BOOSTER
• With key ON, remove the check valve from the brake booster and plug
the check valve.
• Monitor the IAA module PID VACPRES for change in vacuum pressure
after the vacuum pump shuts off.
• Does the vacuum level remain constant?
C6 CHECK BRAKE BOOSTER CHECK VALVE
• With key ON, remove the check valve from the vacuum hose and plug
the hose.
• Monitor the IAA PID module VACPRES for change in vacuum pressure
after the vacuum pump shuts off.
• Does the vacuum level remain constant?
C7 CHECK VACUUM TEE ASSEMBLY
• With key ON, remove the brake booster vacuum hose from the vacuum
tee assembly and plug the vacuum tee fitting.
• Monitor the IAA module PID VACPRES for change in vacuum pressure
after the vacuum pump shuts off.
• Does the vacuum level remain constant?
Power Brake Actuation
TEST STEP ACTION TO TAKE
Yes = GO to Pinpoint Test A.
No = GO to C2.
Yes = RECONNECT the vacuum
line joint connection. GO to
C3.
No = RECONNECT the vacuum
line joint connection. GO to
C4.
Yes = PERFORM Climate Control
Vacuum System Leak Test.
REFER to Section 412-02.
No = REPLACE the vacuum line
between the climate control
vacuum reservoir and
vacuum line joint
connection.
Yes = RECONNECT the vacuum
line. GO to C5.
No = REPLACE the vacuum line
between the vacuum line
joint connector and vacuum
tee assembly.
Yes = REPLACE the brake
booster. REFER to Section
206-07 of the 2001 Ranger
Workshop Manual.
No = GO to C6.
Yes = REPLACE the brake booster
check valve.
No = GO to C7.
Yes = REPLACE the brake booster
vacuum hose.
No = REPLACE the vacuum tee
assembly. REFER to the
procedure for the
pressure sensor.
2001 Ranger EV, 01/2001
206-07-7
vacuum