Generac Power Systems 16 kW NG, 10 kW LP, 13 kW NG, 7 kW NG, 9 kW NG, 8 kW LP Choke Solenoid, 8kW

DC control

Part 4

Section 4.4

Diagnostic tests

Procedure:

1.Set a VOM to measure resistance.

2.Disconnect the J2 Connector from the controller.

3.Connect one meter test lead to the ground terminal. Connect the other meter test lead to each of the follow- ing J2 connector pin locations.

	J2-11 Wire 56
8kW	If CONTINUITY was measured,
	go to Step 4. Average nominal
	resistance reading is 4 ohms:
	Single Cylinder Starter Contactor
	(SC) 4 ohms,
	Choke Solenoid (CS) is 4 ohms.
10 kW - 20 kW	If CONTINUITY was measured,
	go to Step 5.
	Average nominal resistance reading
	is 150-160 ohms.
	V-twin Starter Contact Relay
	(SCR): 150-160 ohms.
	Choke Solenoid (CS) 4 ohms.

	J2-3 Wire 14
8kW	If CONTINUITY was measured,
	go to Step 6. Average nominal
	resistance reading is 16 ohms:
	Fuel Solenoid (FS): 16 ohms.
10kw	If CONTINUITY was measured,
	go to Step 7. Average nominal
	resistance reading is 16 ohms.
	Fuel Solenoids (FS) 16 ohms,
	(FS2) 7 ohms. Choke Solenoid
	(CS) 4 ohms.
10 kW - 20 kW	If CONTINUITY was measured,
	go to Step 8. Average nominal
	resistance reading is 16 ohms.
	Fuel Solenoid (FS) 16 ohms.
	Choke Solenoid (CS) 4 ohms.

J2-12 Wire 4

10 kW - 20 kW If RESISTANCE was measured, go to Step 9.

For average nominal resistance reading of the rotor, refer to the front of the manual.

4.Disconnect Wire 56 and Wire 0 from the Starter Contactor (SC). Disconnect the Choke Solenoid (CS) connector.

a.Connect one meter test lead to the SC terminal from which Wire 56 was removed. Connect the other meter test lead to the ground terminal, 4

ohms should be measured. If zero resistance was measured, replace the SC.

b.Connect one meter test lead to the CS connec- tor Wire 56. Connect the other meter test lead to the CS connector Wire 90. 4 ohms should be measured. If zero resistance was measured, replace the Choke Solenoid.

c.If coil resistance was measured in the Starter

Contactor, and Choke Solenoid Wire 56 is short- ed to ground between the J2 Connector and SC or CS, repair or replace the shorted wire.

5.Disconnect Wire 56 from the Starter Contactor Relay (SCR). Disconnect the Choke Solenoid (CS) connector.

a.Connect one meter test lead to the SCR terminal from which Wire 56 was removed. Connect the other meter test lead to the ground terminal. 4 ohms should be measured. If zero resistance was measured, replace the Starter Contactor Relay.

b.Connect one meter test lead to the CS connec- tor Wire 56. Connect the other meter test lead to the CS connector Wire 90. 4 ohms should be measured. If zero resistance was measured, replace the Choke Solenoid.

If coil resistance was measured in SCR and CS Wire 56 is shorted to ground between J2 connector and SC or CS, repair or replace the shorted wire.

6.Disconnect Wire 14 from the Fuel Solenoid (FS).

a.Connect one meter test lead to the FS terminal from which Wire 14 was removed. Connect the other meter test lead to the ground terminal. 16 ohms should be measured. If zero resistance was measured, replace the Fuel Solenoid.

b.If coil resistance was measured in FS Wire 14 is shorted to ground between J2 connector and FS, repair or replace the shorted wire.

7.Disconnect Wire 14 from the Fuel Solenoid (FS), Fuel Solenoid 2 (FS2), and Choke Solenoid (CS),

a.Connect one meter test lead to the FS terminal from which Wire 14 was removed. Connect the other meter test lead to the ground terminal. 16 ohms should be measured. If zero resistance was measured, replace the Fuel Solenoid.

b.Connect one meter test lead to the FS2 termi- nal from which Wire 14 was removed. Connect the other meter test lead to the ground terminal. 7 ohms should be measured. If zero resistance was measured, replace Fuel Solenoid 1.

c.At the CS connector, connect one meter test lead to Wire 14 connect the other meter test lead to Wire 90. 4 ohms should be measured. If zero resistance was measured, replace the

Choke Solenoid.

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