Lincoln Electric RANGER 305 D Service Manual page 91

RANGER 305D
P-72
3
BLACK
4
WHITE
IDLE SOLENOID
CONNECTOR
(LEAD ENTRY VIEW)
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 approximately 12 to 15 ohms.
Check the resistance 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 resistance 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 solenoid should
activate. REMOVE THE VOLTAGE IMMEDIATELY
to avoid damage to the unit.
IDLER SOLENOID TEST (continued)
FIGURE F.7 – PLUG(S) PIN LOC TION
1
2
RED
1
215
TO CONTROL
P.C. BOARD
IDLE SOLENOID
WIRING HARNESS
CONNECTOR
(LEAD ENTRY VIEW)
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.
F 34
TROUBLESHOOTING & REPAIR
J-72
210A
3
START BUTTON
232
4
2
PULL COIL
P.C. BOARD