Generac Power Systems 5411 Test 27 - Check Wire, Test 28 - Check Fuel Solenoid Gasoline Models

Section 7

DIAGNOSTIC TESTS

Test 27 – Check Wire 18

DISCUSSION:

Wire 18 controls sending the STOP signal to the Printed Circuit Board. Coach manufacturers some- times install a 15 to 30 foot remote harness. If unit shuts down or will not start, a possible ground exists on Wire 18.

PROCEDURE:

1.Disconnect the customer installed remote harness connector from the generator. Then press the gen- erator Start-Stop switch to the “Start” position. If generator starts and continues to run, a short is present in the coach remote harness. Repair or replace the remote harness.

2.Remove the J1 connector from the Printed Circuit Board. Set the VOM to measure resis- tance. Connect one test lead to Pin Location J1- 2. Connect the other test lead to a clean frame ground. “Infinity” should be measured.

WIRE 18

AT PIN LOCATION B

A H

B G

C F

D E

Figure 7-31. – Remote Harness Connector

3.Connect one test lead to Pin Location B on the Remote Harness connector (see Figure 7-31). 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 18 between J1 Connector and Start-Stop Switch.

2.If “Continuity” was measured in Step 3, repair or replace shorted Wire 18 between J1 Connector and remote panel connector.

3.If Wire 18 checks GOOD, proceed to Problem 8 (Section 6).

Test 28 – Check Fuel Solenoid

(Gasoline Models)

DISCUSSION:

If the Fuel Solenoid fails to open, the engine will not start.

PROCEDURE:

1.Remove Control Panel cover. Remove Wire 56 from the Starter Contactor Relay. This will prevent the unit from cranking during test (see Figure 7- 19, Page 47).

2.Remove air filter cover. Disconnect Connector 2 which connects to the fuel pump.

3.Activate the Start-Stop Switch (SW1) to the “Start” position and hold. This will activate the fuel solenoid. The fuel solenoid should energize and produce an audible click. If the fuel solenoid does not operate, proceed to Step 4. Reconnect Connector 2 back to the fuel pump.

4.Set the VOM to measure DC voltage. Disconnect Wire 14 from the Fuel Solenoid. Connect the posi- tive (+) meter test lead to Wire 14 that goes to the control panel. Connect the negative (-) test lead to a clean frame ground. Activate the Start-Stop Switch (SW1) to the “START” position and hold. Battery voltage should be measured.

5.Set the VOM to measure resistance. Disconnect Wire 0 from the Carburetor at the bullet connec- tor. Connect one test lead to Wire 0 that goes to the control panel. Connect the other test lead to a clean frame ground. “Continuity” should be mea- sured.

6.Connect one test lead to the Green Wire going to the carburetor. Connect the other test lead to the carburetor body. “Continuity” should be measured.

Short to Ground:

7.Set the VOM to measure resistance. Disconnect the bullet connector going to the Fuel Solenoid. Connect one meter test lead to the Red Wire going to the Fuel Solenoid. Connect the other meter test lead to the Fuel Solenoid housing. A reading of 38.0 ohms should be measured. If very low resistance is measured, a short to ground exists. (Fuel Solenoid coil resistance is approximately 38.0 ohms. Current draw of the Fuel Solenoid at nominal voltage is approximately 331 milliamps or 0.331 amps).

RESULTS:

1.If the Fuel Solenoid passes Steps 4 & 5 but does NOT operate in Step 3, replace or repair Fuel Solenoid.

2.If battery voltage is not measured in Step 4, repair or replace Wire 14 between the 4-tab Connector and the Fuel Solenoid.

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