| |
TM 10-3930-643-20
ELECTRICAL SYSTEM TROUBLESHOOTING AND MAINTENANCE. (cont)
5-8.
Instrument Panel Troubleshooting. (cont)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
s.
ENGINE FAN OFF SWITCH DOES NOT OPERATE. (cont)
If the multimeter needle does not move, the circuit does not have
continuity. Replace engine fan off switch, refer to paragraph 5-20.
Step 2.
Test the continuity of the fan clutch relay. Disconnect wire
assembly from the relay, as shown.
Connect
multimeter to
terminals on relay.
If multimeter needle does not move, the relay does not have
continutiy. Replace the relay. Refer to paragraph 5-26.
Step 3.
Test the continuity of the wire assembly. Disconnect Terminal
A from engine fan off switch.
Disconnect harness assembly at
Connector B from fan circuit relay. Connect multimeter to
Terminal A and Connector B.
If the multimeter needle does not move, the circuit does not have
c o n t i n u i t y.
I d e n t i f y a s a d e f e c t i v e w i r e a n d c o n t a c t D i r e c t
Support.
Step 4.
Test the continuity of the wire assembly. Disconnect Terminal
C from engine fan off switch, as shown. Disconnect instrument
panel harness from intermediate harness, as shown.
Connect
multimeter to Terminal C and Pin Y.
If the multimeter needle does not move, the circuit does not have
c o n t i n u i t y.
I d e n t i f y a s a d e f e c t i v e w i r e a n d c o n t a c t D i r e ct
Support.
Step 5.
Test the continuity of the wire assembly. Disconnect Terminal
D from fan clutch, as shown. Disconnect main harness from
intermediate harness, as shown.
Connect multimeter to Terminal
D and Pin Y.
5-70
|