TM-9-2350-277-20-1 Unit Maintenance Manual Volume 1 M113A3 M577A3 M1064A3 M1068A3 M58 Download
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TM 9-2350-277-20-1 COOLANT HEATER MALFUNCTIONS—Continued 0089 00 DY 1. Remove harness 10943141 plug (1) from heater control jack (2). 2. Measure voltage between heater control jack (2) pin A (3) and ground with HEATER switch on START. 3. Does multimeter read 17 volts or more? YES NO GO TO EY (PAGE 0089 00-8) D2Y 1. Install harness 10943141 on heater control box jack. 2. Remove harness 10943141 plug (1) from heater fuel pump jack (2). 3. Measure voltage between harness 10943141 plug (1) pin and ground with HEATER switch on START. 4. Does multimeter read 17 volts or more? YES NO D2YN 1. Replace harness 10943141 circuit 402 (WP 0382 00). 2. Verify no faults found. D3Y 1. Replace coolant heater fuel pump (WP 0731 00). 2. Verify no faults found. 0089 00-7