Lincoln Electric SVM175-A service manual 34TROUBLESHOOTING & REPAIRF-34, Idler Solenoid Test

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F-34TROUBLESHOOTING & REPAIRF-34

IDLER SOLENOID TEST (continued)

FIGURE F.7 – PLUG(S) PIN LOCATION

		P-72						J-72		210A
BLACK	3		1				1		3
					215					START BUTTON
										232
WHITE	4		2				2		4
				RED		TO CONTROL
										PULL COIL
						P.C. BOARD				P.C. BOARD
IDLE SOLENOID						IDLE SOLENOID
	CONNECTOR					WIRING HARNESS
(LEAD ENTRY VIEW)							CONNECTOR
						(LEAD ENTRY VIEW)

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TEST PROCEDURE 1. Turn the engine off.

2. Open the right side engine service access door.

3. Locate the idler solenoid mounted on the fuel injection pump. (See illustration in

Fuel Solenoid Test)

4. Locate and unplug harness connection P/J

72. Cut any necessary cable ties. See Wiring Diagram.

5. Using the volt/ohmmeter, check the pull-in coil resistance, pins 3 and 4 (black wire to white wire). The normal resistance is less than 0.5 ohms. Check the hold-in coil resistance, pins 3 and 2 (black wire to red wire). The normal resistance is approxi- mately 12 to 15 ohms. Check the resis- tance between pin 3 (black wire) and a clean, unpainted chassis ground. The resistance should be very high. 500,000 Ohms or more. If any of the above resis- tance values are incorrect, the solenoid may be faulty. Replace. See Figure F.7.

6.Using the external 12VDC supply, apply 12VDC to the pull-in coil leads at pins 3+ and 4- (black wire to white wire). The sole- noid should activate. REMOVE THE VOLTAGE IMMEDIATELY to avoid dam- age to the unit.

Apply 12VDC to the hold-in coil at pin #3 (black wire +) and pin #2 (red wire -). While the voltage is applied, manually move the solenoid to the low idle position. The sole- noid plunger should hold this position until the voltage is removed. See Figure F.7.

7.If either coil does not operate as described, check for mechanical restrictions or other problems with the linkage.

8.If the linkage is intact and the solenoid does not operate correctly when the 12VDC is applied, the solenoid may be faulty. Replace.

9.Re-connect idle solenoid and replace any previously removed cable ties.

10.If finished testing, close the engine service access door.

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