Guardian Technologies 4456 TEST 54 - CHECK FUEL SOLENOID, TEST 55 - CHECK FOR IGNITION SPARK

DC CONTROL

PART 4

SECTION 4.4

DIAGNOSTIC TESTS

4.If the engine cranks but does not start and battery voltage was measured in Steps 2, 3 and 4, and CONTINUITY was NOT measured in Step 6, repair or replace Wire 0 between the Control Panel ground connection and the Fuel Solenoid terminal. If CONTINUITY was measured in Step 6, proceed to Test 52 or test 54 depending on the model.

TEST 54 - CHECK FUEL SOLENOID

DISCUSSION:

In Test 53, if battery voltage was delivered to Wire 14, the fuel solenoid should have energized open. This test will verify whether or not the fuel solenoid is operating.

Fuel Solenoid Nominal Resistance 27-33 ohms.

Figure 18. The Fuel Solenoid (FS)

PROCEDURE:

1.Disconnect Wire 56 from the starter contactor relay (SCR). This will disable the unit from cranking. For single cylinder units, disconnect from the starter contactor (SC) and isolate it from ground.

2.Place one hand on the Fuel Solenoid (FS). Cycle the AUTO-OFF-MANUAL switch from MANUAL to OFF. You should be able to feel the solenoid actuate as well as hear it actuate. If a small screwdriver is placed on the solenoid and then gently pulled away, a magnetic field should be felt.

3.Set the AUTO-OFF-MANUAL switch to OFF. Reconnect Wire 56 to starter contactor relay or starter contactor.

RESULTS:

1.If solenoid actuates, go to Test 55.

2.Replace the solenoid if it does not actuate.

TEST 55 - CHECK FOR IGNITION SPARK

DISCUSSION:

If the engine cranks but will not start, perhaps an ignition system failure has occurred. A special "spark tester" (Generac P/N 0C5969) can be used to check for ignition spark.

Figure 19. Spark Tester

PROCEDURE:

1.Remove spark plug leads from the spark plugs (Figure 20).

2.Attach the clamp of the spark tester to the engine cylinder head.

Figure 20. Checking Ignition Spark

Page 4.4-11