Ford Transit 2002 Owner's Manual page 1478

C20: CHECK ELECTRICAL CIRCUIT BETWEEN A/C CLUTCH RELAY AND PCM FOR OPEN
CIRCUIT - VEHICLES WITH 1.8L (55 KW) DIESEL ENGINE AND VEHICLES WITH LPG
FUEL SYSTEM
C21: CHECK ELECTRICAL CIRCUIT BETWEEN A/C LOW PRESSURE SWITCH AND
POWERTRAIN CONTROL MODULE (PCM) FOR OPEN CIRCUIT - VEHICLES WITH 1.8L
(66 KW) DIESEL ENGINE
C22: CHECK ELECTRICAL CIRCUIT BETWEEN A/C CLUTCH RELAY AND PCM FOR OPEN
CIRCUIT - VEHICLES WITH 1.8L (66 KW) DIESEL ENGINE
(GN/YE) between the A/C low pressure switch and
the PCM using the Wiring Diagrams. CHECK the
operation of the system.
Measure the resistance between the PCM,
1
connector C415, pin 69, circuit 31S-FA11 (BK/YE),
wiring harness side and the A/C clutch relay, socket
C1011, pin 2, circuit 31S-FA11 (BK/YE), wiring
harness side.
Is a resistance of less than 2 Ohm registered?
Yes
GO to C25.
No
LOCATE and RECTIFY the break in circuit 31S-FA11
(BK/YE) between PCM and the air conditioning
clutch relay using the Wiring Diagrams. CHECK the
operation of the system.
Disconnect connector C414 of PCM.
1
Measure the resistance between PCM, connector
2
C414, pin 19, circuit 15S-RE8 (GN/YE), wiring
harness side and A/C low pressure switch,
connector C692, pin 1, circuit 15S-RE8 (GN/YE),
wiring harness side.
Is a resistance of less than 2 Ohm registered?
Yes
GO to C22.
No
LOCATE and REPAIR the break in circuit 15S-RE8
(GN/YE) between the A/C low pressure switch and
the PCM using the Wiring Diagrams. CHECK the
operation of the system.
Measure the resistance between the PCM,
1
connector C414, pin 79, circuit 31S-FA11 (BK/YE),
wiring harness side and the A/C clutch relay, socket
C1011, pin 2, circuit 31S-FA11 (BK/YE), wiring
harness side.
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