ARMY TM 9-2805-256-14
AIR FORCE TO 38G2-102-2
NAVY NAVFAC P-8-611-14E
Table 5-1. Direct Support Troubleshooting Procedures (cont).
Test or Inspection
5. ENGINE WILL NOT START OR RUNS ERRATICALLY MODEL 1A08-4.
N O TE
The following procedures can be performed with either a digital or analog multimeter
refer to figure 5-27 for wiring diagram of electronic ignition system.
Check low and high voltage cable ends for looseness.
Tighten any loose connections.
Remove high voltage cable from spark plug. Ground cable and hold spring approximately
1/4 in. (6 cm.) from engine. Pull start engine and check for spark.
If spark is present remove and inspect spark plug (para. 4-19).
Remove ignition control unit cover and check for moisture or foreign material.
If moisture is present clean and dry terminals and connections and repeat step 2.
Check low voltage cable end to end continuity.
If continuity is not present in all three lines replace low voltage cable (para. 5-13).
Remove wiring from no. 1 terminal on ignition control unit module. Measure resistance
between terminal no. 1 and ground.
If reading is less than 1 Megohm replace ignition module (para. 5-12).
Remove wiring from terminals no. 5 and no. 6 and check resistance. Meter should show an
initial deflection then a reading of 1 Megohm.
If final reading is not 1 Megohm then replace ignition control unit ignition module
Check transformer resistance between white and brown wires.
If resistance is more than 1 ohm replace transformer (para. 5-11).
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