TM-9-2320-361-20

2-1/2-TON, 6x6, M44A2 SERIES TRUCKS (MULTIFUEL)

TECHNICAL MANUAL; UNIT MAINTENANCE

OCTOBER 1991

TM-9-2320-361-20 - Page 223 of 1207

TM 9-2320-361-20

Table 2-4. Electrical Troubleshooting (Contd).

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

Test 4. Test manifold heater spark plug.

Step 1. Remove manifold heater spark plug (para. 3-30 or 3-31).

Step 2. Connect jumper wire from spark plug to engine ground.

Step 3. Disconnect wiring harness from manifold heater fuel pump.

Step 4. Turn accessory/ignition switch to ON position.

Step 5. Position manifold heater switch to START.

a. If spark plug does not arc, replace spark plug (para. 3-30 or 3-31) and repeat test 4.

b. If retest of test 4 fails to produce an arc to engine ground, go to test 5.

Test 5. Test manifold spark plug cable.

Step 1. Remove cable from manifold heater spark plug (para. 3-30 or 3-31).

Step 2. Remove spark plug cable at ignition coil.

Step 3. Set multimeter to RX1000 scale.

Step 4. Touch multimeter negative lead to contact end of spark plug cable at the plug.

Step 5. Touch multimeter positive lead to opposite end of spark plug cable.

a. Continuity should be present. If continuity is present, go to test 6.

b. If continuity is not present, replace or repair spark plug cable (para. 3-30

or 3-31).

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