2FB/2FC-4
1-5-64
(35)
PWB fan motor 1 or 2
does not operate.
1. Broken PWB fan motor 1
or 2 coil.
Check for continuity across the coil. If none, replace PWB fan
motor 1 or 2.
2. Poor contact in PWB fan
motor 1 or 2 connector
terminals.
Reinsert the connector. Also check for continuity within the con-
nector cable. If none, remedy or replace the cable.
3. Defective PWB fan motor
1.
Run maintenance item U037 and check if PWB fan motor 1 oper-
ates when YC2-5 on the fan motors drive PWB outputs 24 V. If
not, replace PWB fan motor 1.
4. Defective PWB fan motor
2.
Run maintenance item U037 and check if PWB fan motor 2 oper-
ates when YC2-7 on the fan motors drive PWB outputs 24 V. If
not, replace PWB fan motor 2.
5. Defective fan motors
drive PWB.
Run maintenance item U037 and check if YC2-5 or YC2-7 on the
fan motors drive PWB outputs 24 V. If not, replace the fan motors
drive PWB.
6. Defective engine PWB. Run maintenance item U037 and check if YC13-3 on the engine
PWB outputs 24 V. If not, replace the engine PWB.
(36)
The power source
fan motor does not
operate.
1. Broken power source fan
motor coil.
Check for continuity across the coil. If none, replace the power
source fan motor.
2. Poor contact in power
source fan motor con-
nector terminals.
Reinsert the connector. Also check for continuity within the con-
nector cable. If none, remedy or replace the cable.
(37)
The feedshift fan
motor does not oper-
ate.
1. Broken feedshift fan
motor coil.
Check for continuity across the coil. If none, replace the feedshift
fan motor.
2. Poor contact in feedshift
fan motor connector ter-
minals.
Reinsert the connector. Also check for continuity within the con-
nector cable. If none, remedy or replace the cable.
3. Defective feedshift fan
motor.
Run maintenance item U037 and check if the feedshift fan motor
operates when YC6-4 on the engine PWB outputs 24 V. If not,
replace the feedshift fan motor.
4. Defective engine PWB. Run maintenance item U037 and check if YC6-4 on the engine
PWB outputs 24 V. If not, replace the engine PWB.
(38)
The duplex fan motor
does not operate.
1. Broken duplex fan motor
coil.
Check for continuity across the coil. If none, replace the duplex
fan motor.
2. Poor contact in duplex
fan motor connector ter-
minals.
Reinsert the connector. Also check for continuity within the con-
nector cable. If none, remedy or replace the cable.
3. Defective duplex fan
motor.
Run maintenance item U037 and check if the duplex fan motor
operates when YC13-7 on the engine PWB outputs 24 V. If not,
replace the duplex fan motor.
4. Defective engine PWB. Run maintenance item U037 and check if YC13-7 on the engine
PWB outputs 24 V. If not, replace the engine PWB.
(39)
The shield box fan
motor does not oper-
ate.
1. Broken shield box fan
motor coil.
Check for continuity across the coil. If none, replace the shield box
fan motor.
2. Poor contact in shield
box fan motor connector
terminals.
Reinsert the connector. Also check for continuity within the con-
nector cable. If none, remedy or replace the cable.
Problem Causes Check procedures/corrective measures
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