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Section 7
DIAGNOSTIC TESTS
erator will run out of gas before the vehicle engine.
PROCEDURE:
Check fuel level in the supply tank. Attach a fresh fuel
supply if necessary and restart. Fuel may be stale,
causing a hard start.
RESULTS:
1. If necessary, replenish fuel supply.
2. If fuel is good, go to Test 29.
TEST 29 - CHECK WIRE 14 POWER SUPPLY
DISCUSSION:
When the engine is cranked, Engine Controller circuit
board action must deliver battery voltage to the Wire
14 circuit or the engine will not start. This is because
the Wire 14 circuit operates the Fuel Pump and Fuel
Solenoid.
PROCEDURE:
Inside the generator panel, locate the 4-tab terminal
connector (Figure 7-21). Then, proceed as follows:
1. Set a VOM to read battery voltage (12 VDC).
2. Connect the meter positive (+) test lead to the 4-tab terminal
connector, the common (-) test lead to frame ground.
3. Crank the engine and the meter should read battery voltage. If
battery voltage is not measured, proceed to Step 4.
4. Connect the positive (+) meter test lead to Terminal J2 on the
Engine Controller Circuit Board. Connect the negative (-) test
lead to a clean frame ground.
5. Crank the engine. The meter should indicate battery voltage.
Figure 7-21. – The 4-tab Connector
RESULTS:
1. If the meter Indicated battery voltage, go to Test 30.
2. If battery voltage was NOT indicated in Step 3 but is indicated
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in Step 5, check Wire 14 between the 4-tab connector and the
Engine Controller circuit board.
a. Repair, reconnect or replace Wire 14 as neces-
sary.
3. If battery voltage was not indicated in Step 5, replace the
Engine Controller Circuit Board.
TEST 30 - CHECK WIRE 18
DISCUSSION:
Wire No. 18 controls sending the STOP signal to the
Engine Controller Circuit Board. If Wire No. 18 con-
tacts ground it will initiate a shutdown. Coach manu-
facturers sometimes install a 15 to 30 foot remote
harness. A ground on Wire No. 18 in a remote har-
ness can also cause a shutdown.
PROCEDURE:
1. Remove the remote harness connector from the generator and
re-test. If generator continues to run, a short is present in the
remote harness. Repair or replace the remote harness.
2. Remove the J1 connector from the Engine Controller Circuit
Board. Set the VOM to measure resistance. Connect one test
lead to Pin Location J1-14. Connect the other test lead to a
clean frame ground. Infinity should be measured.
3. Connect one test lead to Pin Location J1-15. Connect the other
test lead to a clean frame ground. Infinity should be measured.
RESULTS:
1. If continuity is measured in Step 2, repair or replace shorted
Wire No. 18 between J1 Connector and Start-Stop Switch.
2. If continuity was measured in Step 3, repair or replace shorted
Wire No. 18 between J1 Connector and remote panel connec-
tor.
TEST 31 - CHECK FUEL SOLENOID
DISCUSSION:
If the Fuel Solenoid fails to open, the engine will not
start.
PROCEDURE:
Set the Start-Stop Switch to "START". The Fuel
Solenoid should actuate.
1. Remove the Control Panel cover to access the back side of the
Fuel Primer Switch.
2. Place a hand on the Fuel Solenoid located at the base of the
carburetor bowl.
3. Connect a jumper between the top and bottom terminals of the
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Troubleshooting
