Pioneer 1200 Maintenance Service Manual page 163

TROUBLESHOOTING AND ELECTRICAL SYSTEM: FE400 ENGINE
1. Turn the key switch OFF and remove the key. Place the Forward/Reverse handle in NEUTRAL. Chock
the wheels.
2. Disconnect the battery cables as instructed (Figure 11-1, Page 11-5). See WARNING "To avoid unin-
tentionally starting..." in General Warning, Section 1, Page 1-2.
3. Disconnect the orange wire from the center post of the fuel level sending unit.
4. With a multimeter set to 2k Ω (ohms), place the red (+) probe of the multimeter on the center post of the
sending unit. Place the black (–) probe on the ground connection of the sending unit (Figure 11-53,
Page 11-43).
5. The following resistance readings (in ohms) should be obtained depending on the position of the float
inside the fuel tank. The resistance reading will vary according to the exact position of the float. The chart
below may be used as a guideline to determine if the fuel level sending unit is operating correctly. Make
sure the float is at the surface of the fuel in the tank.
FLOAT POSITION
Lower position (tank empty)
Center position (tank half full)
Upper position (tank full)
6. If the readings are within the specifications listed above, the fuel level sending unit is working properly.
If the readings are incorrect, the fuel level sending unit has failed and the fuel tank must be replaced. See
Fuel Tank Removal, Section 14, Page 14-21.
7. If the readings are correct and the fuel gauge does not function correctly, check the continuity of the
orange wire from the fuel level sending unit to the fuel gauge/hour meter. Leave the battery disconnected
while checking continuity. Also check the continuity of the yellow wire from the fuel gauge/hour meter to
the key switch, and the black ground wires at the fuel level sending unit and at the fuel gauge/hour meter.
See Fuel Gauge/Hour Meter Removal, Section 12, Page 12-21.
8. If the readings are correct according to the position of the float, but give an incorrect reading on the fuel
gauge/hour meter, test the fuel gauge/hour meter. See Test Procedure 26 – Fuel Gauge on
page 11-44.
WAVETEK 5XL
V
V OFF
1000 500
200 200
20
200
2 2m
200 20
m
m
200
2000
m
k
200k
Ω 20k 200
A
2k
Ω
! !
V COM 200nA
MAX
1000 ---
FUSED
750V
SENDING UNIT
Figure 11-53 Test Fuel Level Sending Unit
2003 Pioneer 1200/1200SE Gasoline Vehicle Maintenance and Service Manual
RESISTANCE READING
240 ± 20 Ω (ohms)
120 ± 20 Ω (ohms)
60 ± 20 Ω (ohms)
TANK
CONNECTION
FRAME
CONNECTION
Test Procedures
FUEL GAUGE READINGS
Empty
Half full
Full
Page 11-43
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