Section 6.4

ENGINE IGNITION SYSTEM

TESTING THE SYSTEM (CONTINUED)

CHECK POWER SUPPLY (CONT’D):

b. If battery voltage is NOT indicated in Step 7, test Wire 14 between the 4-terminal connector and the A6060 circuit board. Repair or replace as necessary.

CHECK IGNITION SENSOR:

1.In the 3-pin connector plug half from the Ignition Module, locate FEMALE Pin 1 to which the BROWN wire connects.

2.Connect a jumper wire from FEMALE Pin 1 (BROWN wire) to frame ground.

3.Connect the Spark Plug high tension lead to a spark tester (Figure 8) and the spark tester clamp to ground.

4.Crank the engine and observe the spark tester for sparking.

Note: Only one spark should be observed upon initial cranking.

Figure 12. Testing Ignition Sensor

If sparking occurs with the BROWN wire grounded but did NOT occur under "TESTING FOR SPARK", the Ignition Sensor is probably defective and should be replaced.

NOTE: The Ignition Sensor is mounted to the gen- erator's Stator Adapter. To replace the Sensor, disassembly of the generator and removal of the Stator will be necessary.

If sparking does NOT occur with the BROWN wire grounded and did NOT occur under "TESTING FOR SPARK", either the Ignition Module or the Ignition Coil is defective. Go to "TESTING IGNITION COIL".

TESTING IGNITION COIL:

The Ignition Coil is housed in the generator control panel. To test the coil, proceed as follows:

1.Unplug the two halves of the 2-pin connector plug from the Ignition Coil. The red and white wires are the primary coil leads.

2.To read PRIMARY coil resistance:

a.Set a volt-ohm-milliammeter (VOM) to its "Rx1 " scale and zero the meter.

b. Connect the VOM test leads across the two male pins of the 2-pin connector. Primary coil resistance should be about 0.5 to 1.5 ohms.

3.To read SECONDARY coil resistance:

a.Set the VOM to its "Rx10,000" or "Rx1 K" scale and zero the meter.

b.Unplug the high tension lead from the Spark Plug.

c.Connect one VOM test lead to the white wire connector pin.

d.Connect the other VOM test lead into the Spark Plug lead rubber boot so it contacts the lead's metal terminal end. The VOM should read approximately 16,000-17,000 ohms (16.0-17.0 k-Ohms).

Replace the Ignition Coil if defective. If the Ignition Coil tested good, go to "TESTING IGNITION MOD- ULE".

TESTING IGNITION MODULE:

If a problem was indicated under "TESTING FOR SPARK", you should have completed the tests under "CHECK POWER SUPPLY", under "CHECK

IGNITION SENSOR" and under "TESTING IGNITION COIL". If these components tested good, replace the Ignition Module.

Figure 13. Testing Ignition Coil

Figure 14. Testing Ignition Module

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Generac Power Systems 940-2, 941-2 service manual Check Power Supply CONT’D, Check Ignition Sensor, Testing Ignition Coil
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941-2, 940-2 specifications

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