Table 1. Heating Systems Troubleshooting Procedures - continued

TM 9-2320-361-24-1

0015 00

HEATING SYSTEMS TROUBLESHOOTING (Contd)

Table 1. Heating Systems Troubleshooting Procedures (Contd).

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

Test 7. Test fuel pump-to-ignition coil

1. ENGINE MANIFOLD

wiring harness.

HEATER DOES NOT

WORK (Contd)

1. Disconnect wiring harness

input to ignition coil.

2. Set multimeter to 24 VDC scale.

3. Turn power accessory switch

to the ON position and touch

multimeter negative lead to

pin B (negative) of wiring

harness at ignition coil.

4. Touch multimeter positive

1. If voltage is present, go to test 9.

lead to pin A (positive) of

2. If voltage is not present, go to

wiring harness at ignition

test 8.

coil.

IGNITION COIL

WIRING HARNESS

PIN A

FUEL PUMP

IGNITION COIL

PIN B

TEST 7

STEP 4

0015 00-5