TM-9-2350-277-20-1

CARRIER M113A3, M577A3, M1059A3, M1064A3, M1068A3 AND M58

TECHNICAL MANUAL; UNIT MAINTENANCE MANUAL VOLUME 1 OF 6

TM-9-2350-277-20-1 - Page 447 of 855

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?

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?

FYN

1.

Replace coolant heater pump

(WP 0731 00).

2.

Verify no faults found.

008900-8

Change 5