Ford 2001 Ranger, Manual

Page: 323 / 1218

412-02-29 412-02-29 Heating and Ventilation
DIAGNOSIS AND TESTING (Continued)
PINPOINT TEST R: RECIRCULATION FUNCTION DOES NOT OPERATE
TEST STEP ACTION TO TAKE
•
Is the outside/recirculation door in the recirculation position?
No = GO to R4.
R4 CHECK OPERATION OF RECIRCULATION VACUUM
SOLENOID
•
With key ON, set the mode select knob to the FLOOR/PANEL position. Yes = GO to R13.
•
Enter the interface adapter assembly (IAA) module active command No = GO to R5.
mode CLIMATE CONTROL COMMAND and set the active commands
MAINT VAC to YES and RECIR SOL to ON.
•
Check the position of the outside/recirculation door.
•
Is the outside/recirculation door in the recirculation position?
R5 CHECK POWER TO IN-LINE C2999
•
With key OFF, disconnect in-line C2999. Yes = RECONNECT in-line
C2999. GO to R9.
•
With key ON, measure the voltage between pin 8 (Y/LG wire) and pin 7 No = GO to R6.
(BK wire) on in-line C2999.
•
Is the voltage greater than 10 volts?
R6 CHECK GROUND TO IN-LINE C2999
•
With key OFF, measure the resistance between pin 7 (BK wire) on Yes = GO to R7.
in-line C2999 and ground.
•
Is the resistance less than 5 ohms?
No = REPAIR the BK wire.
R7 CHECK CIRCUIT 3052 (Y/LG) FOR OPEN
•
Connect 104-Pin Breakout Box (BOB) to IAA module C1945; leave IAA Yes = GO to R8.
module disconnected.
•
With key OFF, measure the resistance of the Y/LG wire between pin 8 No = REPAIR the Y/LG wire.
on in-line C2999 and BOB pin 35.
•
Is the resistance less than 5 ohms?
R8 CHECK CIRCUIT 3052 (Y/LG) FOR SHORT TO GROUND
•
With key OFF, measure the resistance between BOB pin 35 and ground Yes = REPLACE the IAA module.
(BOB pin 80). REFER to Section 412-04 .
•
Is the resistance greater than 10,000 ohms?
No = REPAIR the Y/LG wire.
R9 CHECK POWER TO RECIRCULATION VACUUM SOLENOID
•
With key OFF, disconnect recirculation vacuum solenoid C2994. Yes = GO to R11.
•
With key ON, measure the voltage between the Y/LG wire and BK wire No = GO to R10.
on recirculation vacuum solenoid C2994.
•
Is the voltage greater than 10 volts?
R10 CHECK GROUND TO RECIRCULATION VACUUM SOLENOID
•
With key OFF, measure the resistance between the BK wire on Yes = GO to R11.
recirculation vacuum solenoid C2994 and ground.
•
Is the resistance less than 5 ohms?
No = REPAIR the BK wire.
R11 CHECK VACUUM FROM RECIRCULATION VACUUM
SOLENOID
•
With key ON, set the mode select knob to the OFF position, disconnect Yes = CHECK the
the white vacuum line from the recirculation vacuum solenoid, and check fresh/recirculation door
for vacuum. vacuum motor for vacuum
leak. REPLACE if
necessary.
•
Is vacuum present?
No = GO to R12.
R12 CHECK VACUUM TO RECIRCULATION VACUUM SOLENOID
(Continued)
2001 Ranger EV, 01/2001