Ford F-150 1999 Workshop Manual page 17

1999 F-150/250 Workshop Manual
C16 CHECK CIRCUIT 883 (PK/LB)
C17 CHECK WAC OUTPUT FROM THE PCM
C18 CHECK CIRCUIT 331 (PK/YE)
PCM C174
http://www.fordtechservice.dealerconnection.com/pubs/con...
Measure the voltage between the A/C clutch relay socket pin 3, circuit 883 (PK/LB) and ground.
Is the voltage greater than 10 volts?
Yes
GO to C17.
No
REPAIR circuit 883 (PK/LB). TEST the system for normal operation.
Measure the resistance between the A/C clutch relay socket pin 2, circuit 331 (PK/YE) and ground.
Is the resistance less than 5 ohms?
Yes
INSTALL a new A/C clutch relay. TEST the system for normal operation.
No
GO to C18.
Connect the EEC-V 104-Pin Breakout Box to the PCM C174. Do not connect the breakout box to the PCM.
Measure the resistance between the A/C clutch relay socket pin 2, circuit 331 (PK/YE) and the breakout box pin
69.
Is the resistance less than 5 ohms?
Yes
INSTALL a new PCM. REFER to Section 303-14. TEST the system for normal operation.
Page 17 of 30
8/16/2010