TK 56433-5-MM-EN
45
Figure 38.
Fuel Solenoid Location
1.
Fuel Solenoid
Testing the Fuel Solenoid
If you suspect that the engine does not run because the
fuel solenoid is not operating correctly, use the
following procedure:
1. Measure battery voltage.
a. With engine and controller off, check the voltage
between the positive and negative battery
terminals. If the voltage is below 12.2 Vdc, the
battery needs to be charged or replaced.
2. Remove the fuel solenoid from the engine and
disconnect it from the wire harness.
3. Check the resistance of the hold-in coil.
a. Check the resistance of your meter leads first.
Subtract these values from the resistance values
you measure.
b. Check the hold-in coil resistance between pins A
and C as shown (
).
c. The resistance of the hold-in coil should be 22 to
27 ohms at 76 F (24 C).
N
No
otte
e:: The resistance specifications above are
for measurement at 76 F (24 C). If it is not
possible to measure at room temperature,
use the following table as a guide for the
expected resistance:
Temperature
Hold-In Coil Resistance
Low End
High End
-25 F
-32 C
17.3 Ohms
21.1 Ohms
-10 F
-23 C
18.0 Ohms
22.0 Ohms
0 F
-18 C
18.5 Ohms
22.6 Ohms
25 F
-4 C
19.6 Ohms
24.0 Ohms
50 F
10 C
20.8 Ohms
25.4 Ohms
76 F
24 C
22.1 Ohms
27.0 Ohms
100 F
38 C
23.2 Ohms
28.3 Ohms
125 F
52 C
24.4 Ohms
29.8 Ohms
150 F
66 C
25.6 Ohms
31.2 Ohms
d. If the resistance is out of specifications, proceed
to “Fuel Solenoid Replacement” (below). If the
resistance is OK, continue to step 4.
Figure 39.
Fuel Solenoid Connector Pin
Identification
B
A
C
RAJ528
1.
Red (8D)
2.
White (8DP)
3.
Black (CH)
4. Re-connect the fuel solenoid to the wire harness but
do not reinstall on the engine. Leave the fuel
solenoid hanging from the wire harness so that it is
in sight.
5. Connect an amp clamp on the white wire at the
solenoid OR the wire labeled “8DP” on the other
side of the Deutsch connector (if it is more
accessible there). If your meter is equipped, put it in
“Inrush” or “Min/Max” mode so that it records the
current measured during the time that the pull coil
is energized.
6. Use the microprocessor keypad to enter the
Interface Board Test Mode. Refer to the appropriate
Microprocessor Diagnostic Manual for specific
information about the Interface Board Test Mode.
7. Check the pull-in coil current.
a. Energize the run relay with the Interface Board
Test Mode. Verify the pull-in coil measurement
is recorded during the first two seconds the run
relay is energized.
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