Generac Power Systems 941-2, 940-2 TEST 23- CHECK CARBURETION, TEST 22-TEST AUTOMATIC CHOKE

Section 7.2

ENGINE DC CONTROL SYSTEM / AC TROUBLESHOOTING

If the engine cranks but won't start, it is possible that a failure in the circuit board has occurred and DC power is not being delivered to the Wire 14 circuit.

This test will determine if circuit board action will deliver battery voltage to the necessary engine components.

PROCEDURE:

Set a VOM to read battery voltage. Connect the meter test leads across Pin J2-9 of the A6060 circuit board and Pin J2-6 of the circuit board connector (to which common ground Wire 0 connects). Crank the engine and the meter should read battery voltage.

RESULTS:

1.If DC voltage was NOT indicated in Test 17, but IS indicated now, repair, reconnect or replace Wire 14 between board and Ignition Module.

2.If no DC voltage in Test 3 but good voltage now, replace Wire 14 between board and fuel pump.

3.If there is no DC output from the circuit board to Wire 14, replace the A6060 circuit board.

TEST 23- CHECK CARBURETION

DISCUSSION:

If the engine won't start or if it starts hard and runs rough, one possible cause of the problem is carburetion.

PROCEDURE:

Before making a carburetion check, make sure the fuel tank has an ample supply of clean fresh gasoline (gasoline fuel systems) or gaseous fuel. The installer may have installed a gas or gasoline shutoff valve in the fuel supply system. Make sure all shutoff valves are open.

Make sure the automatic choke is working properly and that the choke closes completely.

If the engine will not start, remove the spark plug and inspect it. If the plug is WET, look for the following:

•Overchoking.

•Water in fuel.

•Excessively rich fuel mixture.

•Intake valve stuck open.

If the spark plug is DRY, look for the following:

•Carburetor gasket(s) leaking.

•Fuel line plugged or shutoff valve not opening.

•Intake valve stuck closed.

•Inoperative fuel pump.

•Clogged fuel filter.

RESULTS:

Adjust or repair carburetor or fuel system as necessary.

Figure 10. Receptacle J2

TEST 22-TEST AUTOMATIC CHOKE

DISCUSSION:

Refer to Section 3.5, "AUTOMATIC CHOKE".

TEST PROCEDURE:

See Section 3.5.

RESULTS:

1.Adjust or repair choke system as necessary.

2.!f choke is good, go to Test 23.

TEST 24- CHECK ENGINE

DISCUSSION:

An engine that will not start or one that starts hard and runs rough may be caused by a failure in the engine's mechanical system.

PROCEDURE:

The first step in checking for an engine problem is to perform a compression check. To check engine com- pression, proceed as follows:

1.Remove the spark plug.

2.Insert an automotive type compression gauge into the spark plug hole.

3.Crank the engine until there is no further in-crease in pressure. The highest reading obtained is the engine's compression pressure.

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