Generac Power Systems 941-2 Service Manual page 102

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.
Page 6.4-4
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