Generac Power Systems 941-2 Service Manual page 124

Section 7.2
ENGINE DC CONTROL SYSTEM / AC TROUBLESHOOTING
Figure 8. Checking Spark Plug Gap
RESULTS:
1. Clean and regap or replace spark plug as necessary.
2. If spark plug is good but engine will not start, go to Test 3.
3. If spark plug is good but engine misses or runs rough,. go to
Test 23.
TEST 17- CHECK IGNITION POWER SUPPLY
DISCUSSION:
During startup, the A6060 circuit board delivers DC
power to the Ignition Module via Wire 14. If the
engine cranks but won't start, one possible cause is
loss of this power supply.
The DC power from the A6060 Circuit Board is deliv-
ered to a 4-tab terminal connector. From that connec-
tor, it is routed to the Ignition Module.
These components are all housed in the control panel.
Figure 9. Ignition Module & 4-Tab Connector
TEST PROCEDURE:
In the control panel, inspect the Wire 14 connections
at the 4-tab connector. Check Wire 14. Check the
power supply as follows:
1. Set a VOM to read battery voltage.
Page 7.2-14
2. Connect the VOM test leads across the 4-tab connector and
frame ground.
3. Hold the engine Start-Stop switch at "START".
The meter should read battery voltage.
RESULTS:
1. If DC voltage is NOT indicated, go to Test 21.
2. If DC voltage is good, go on to Test 18.
TEST 18- CHECK IGNITION SENSOR
DISCUSSION:
Refer to Section 6.4, "ENGINE IGNITION SYSTEM".
TEST PROCEDURE:
See Section 6.4.
RESULTS:
1. Replace Sensor, if bad.
2. If Sensor checks good, go to Test 19.
TEST 19- CHECK IGNITION COIL
DISCUSSION:
See Section 6.4, "ENGINE IGNITION SYSTEM".
TEST PROCEDURE:
See Section 6.4.
RESULTS:
1. Replace Ignition Coil if bad.
2. If coil is good, go to Test 20.
TEST 20- TEST IGNITION MODULE
DISCUSSION:
See Section 6.4, "ENGINE IGNITION SYSTEM".
TEST PROCEDURE:
Refer to Section 6.4.
RESULTS:
Replace Ignition Module if bad.
TEST 21 - CHECK A6060 CIRCUIT BOARD
OUTPUT TO WIRE 14
DISCUSSION:
If the engine cranks when the Start-Stop switch is set
to "START", battery voltage must be available to the
A6060 circuit board.