TM 9-2350-277-20-1
COOLANT HEATER MALFUNCTIONS—Continued
0089 00
EY
1. Remove heater control box (WP 0736 00).
2. Measure resistance between lead ends of heater output jack (1)
pin A (2) and ON/OFF/START switch terminal 14 (3).
3. Does multimeter read 0 ohms?
YES
NO
EYN
1. Replace faulty lead (WP 0737 00).
2. Verify no faults found.
E2Y
1. Replace heater ON/OFF/START switch (WP 0737 00).
2. Verify no faults found.
FY
1. Measure voltage between harness 10943152 circuit 402B
terminal (1) on coolant pump and ground (switch on start).
2. Does multimeter read less than 17 volts?
YES
NO
FYN
1. Replace coolant heater pump
(WP 0731 00).
2. Verify no faults found.
0089 00-8
