Generac Power Systems 53187 - Manual (Page 138)

SECTION 5.9
TROUBLESHOOTING TEST PROCEDURES
Test 16- Check Wire 14 Voltage
PROCEDURE (CONT'D);
3. Crank the engine. The VOM connected in Step 2
should read battery voltage, indicating that the W ire 14
circuit is electrically hot
4. Repeat Step 3 w ith the m eter test leads connected
across circuit board term inals 10 and 2.
5. Repeat Step 3 w ith the m eter test leads connected
across circuit board term inals 11 and 2.
RESULTS;
1. If no voltage is indicated at W ire 14, rem ove and
replace the engine control circuit board.
2. If voltage tests are good, go to Test 17.
Test 17- Test Fuel Solenoid
DISCUSSION;
The fuel solenoid is a part of the fuel injection pum p
assem bly.
PROCEDURE;
1. Set a VOM to read DC volts.
2. Connect the m eter positive (+) test lead to the
term inal of the fuel solenoid; the com m on (-) test lead
to fram e ground.
3. Crank the engine. The m eter should read battery
voltage and the solenoid should actuate.
RESULTS;
1
PARTS
ENGINE ELECTRICAL SYSTEM
1. If the VOM reads battery voltage and the solenoid
actuates, go on to Test 18.
2. Replace the fuel solenoid if battery voltage is indi­
cated but it does not actuate.
3. If battery voltage is not indicated, check W ire 14
betw een the fuel solenoid and the engine control board
for an open condition.
Test 18- Test Fuel Pump
Discussion;
The electric fuel pum p is turned on by W ire 14
during cranking and running operations.
PROCEDURE;
Refer to Part 4, Section 4.2, FUEL PUM P.
RESULTS;
1. Replace fuel pum p if it is defective.
2. If fuel pum p checks good, go to Test 19.
Test 19- Check Engine Fuel & Mechani­
cal Systems
DISCUSSION;
If the engine cranks norm ally but w ill not start, one
possible cause m ight be a m alfunctioning engine fuel
system or m echanical system .
Refer to Part 2, “Engine Mechanical System " and
Part 4, “Engine Fuel System “.
Test 20- Test Control Relay (CR2)
DISCUSSION;
Control relay (CR2) is used on Type 1 DC control
system s only. It acts as a “holding" relay. That is, w hile
cranking, relay (CR1) delivers 12 VDC to the engine
control circuit board. Circuit board action then delivers
12 VDC to the CR2 coil. CR2 energizes and its contacts/
close. W hen the start/stop sw itch is released to term i­
nate cranking, 12 VDC is delivered to the engine control
circuit board via the closed contacts of relay CR2.
PROCEDURE:
In the control panel, locate the run relay CR2, to
w hich W ires 0, 14, 15 and 15B connect. Inspect all
w ires carefully. Com pare w iring connections to the
appropriate w iring diagram , m ake sure w ires are prop­
erly connected.
PAGE 5.9-6