Ford 2002 Bantam Workshop Manual page 1112

412-00-19
DIAGNOSIS AND TESTING (CONTINUED)
CONDITIONS
B21: CHECK THE CIRCUIT 31S-CA12A (BK/BU) FOR OPEN
B22: CHECK THE DUAL PRESSURE SWITCH
1.
E9425 EN
Climate Control System — General Information
2.
Dual pressure
switch C77
DETAILS/RESULTS/ACTIONS
2 Measure the voltage between PCM, connector
C43, pin 25, circuit 31S-CA11 (BK/YE),
harness side and ground.
• Is battery voltage indicated?
Yes
GO TO B21
No
REPAIR the open circuit(s) between relay –
A/C W.O.T and PCM by using the wiring
diagrams. TEST the system for normal op-
eration.
1 Switch on the A/C system and the heater
blower.
2 Measure the resistance between PCM,
connector C43, pin 41, circuit 31S-CA12A
(BK/BU), harness side and ground.
• Is battery voltage indicated?
Yes
CHECK the PCM. If necessary INSTALL a
new one. TEST the system for normal
operation.
No
REPAIR the open circuit(s) between PCM
and ground by using the wiring diagrams.
TEST the system for normal operation.
3 Measure the resistance between the dual
pressure switch, connector C77, pin 2 and pin
4, component side.
• Is the resistance less than 2 ohms?
Yes
GO TO B23
No
CHECK the dual pressure switch; INSTALL
a new one if necessary. TEST the system
for normal operation.
412-00-19
07/2001 2002 Bantam