TM-9-2350-247-20-1 Unit Maintenance Manual Volume 1 M548A1 M548A3 Tracked Cargo Carrier Download
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TM 9-2350-247-20-1 COOLANT HEATER MALFUNCTIONS—Continued 0086 00 2FY 1. Replace heater ON/OFF/START switch (WP 0472 00). 2. Verify no faults found. GY 1. Measure voltage between coolant pump to heater harness terminal circuit 402B (1) on coolant pump and ground with switch in start position. 2. Does multimeter read less than 17 volts? YES NO GYN 1. Replace coolant heater pump (WP 0478 00). 2. Verify no faults found. 2GY 1. Measure voltage between coolant pump to heater harness circuit 402B (1) on terminal strip (2) and ground with switch in start position. 2. Does multimeter read less than 17 volts? YES NO 2GYN 1. Replace coolant pump to heater harness (WP 0473 00). 2. Verify no faults found. 3GY 1. Replace coolant heater (WP 0477 00). 2. Verify no faults found. 0086 00-8