TM 9-2350-247-20-1
COOLANT HEATER MALFUNCTIONSContinued
0086 00
2EY
1. Install heater harness on heater control box jack.
2. Remove heater harness 402A plug (1) from heater fuel pump
jack (2).
3. Measure voltage between plug (1) pin and ground with HEATER
switch on START.
4. Does multimeter read more than 17 volts?
YES
NO
2EYN
1. Faulty heater harness circuit 402.
2. Notify your supervisor.
3EY
1. Replace coolant heater fuel pump (WP 0475 00).
2. Verify no faults found.
FY
1. Remove heater control box (WP 0474 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
FYN
1. Repair/replace faulty lead
(WP 0294 00).
2. Verify no faults found.
0086 00-7