TM-9-2350-311-20-1

HOWITZER, MEDIUM, SELF-PROPELLED, 155MM; M109A2, M109A3, M109A4 AND M109A5

TECHNICAL MANUAL; UNIT MAINTENANCE MANUAL FOR HULL, POWERPLANT, DRIVE CONTROLS, TRACKS, SUSPENSION, AND ASSOCIATED COMPONENTS

AUGUST 1994

TM-9-2350-311-20-1 - Page 210 of 1275

TM 9-2350-311-20-1

3-3 TROUBLESHOOTING CHART — CONTINUED

h. FLAME HEATER CIRCUIT (ENGINE MODEL

FLAME HEATER DOES NOT OPERATE — CONTINUED

7083-7396) — CONTINUED

CONTINUED FROM STEP D

1. Disconnect lead 486 from pump and motor

assembly.

2. Place red lead of multimeters in lead 486 and

black lead to ground.

3. Turn MASTER and FLAME HEATER

switches ON and check for voltage.

4. Turn MASTER and FLAME HEATER

switches OFF.

Is voltage present?

Replace pump and motor

assembly (para 5-9).

1. Reconnect lead 486 to pump and motor

assembly.

2. Disconnect powerplant wiring harness from

flame heater disconnect.

3. Place red lead of multimeters in socket A

(lead 486) and black lead to ground.

4. Turn MASTER and FLAME HEATER

switches ON and check for voltage.

5. Turn MASTER and FLAME HEATER

switches OFF.

Is voltage present?

Notify support maintenance.

CONTINUED ON NEXT PAGE

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