Thermo King 002008, Manual

Page: 67 / 155

Engine Maintenance
67
7. Test the pull-in coil by momentarily placing a
jumper between the white wire (8DP—pin B)
in the fuel solenoid connector and the positive
battery terminal. The fuel solenoid should
make a definite click when the pull-in coil is
energized and should click again when the
pull-in coil is de-energized.
NOTE: The pull-in coil will draw 35 to 45
amps so do not leave the jumper connected to
the white wire (8DP—pin B) for more than a
few seconds.
a. If the pull-in coil does not energize, check
the resistance of the pull-in coil by placing
an ohmmeter between the white wire
(8DP—pin B) and the black wire (CH—
pin C) in the fuel solenoid connector. The
resistance of the pull-in coil should be 0.2
to 0.3 ohms. If the resistance of the pull-in
coil is not in this range, replace the fuel
solenoid.
NOTE: If the pull-in coil fails, make sure to
replace the fuel solenoid relay with relay
P/N 41-478. This particular relay is needed
for the high current flow through the hold-in
coil.
b. If the pull-in coil does energize, go to
step 8.
8. Test the hold-in coil.
a. Energize the hold-in coil by placing a
jumper between the red wire (8D—pin A)
in the fuel solenoid connector and the
positive battery terminal.
b. Momentarily energize the pull-in coil by
placing a jumper between the white wire
(8DP—pin B) in the fuel solenoid
connector and the positive battery
terminal. The fuel solenoid should make a
definite click when the pull-in coil is
energized, but should not click when the
pull-in coil is de-energized.
c. De-energize the hold-in coil by removing
the jumper from the red wire (8D—pin A)
and the positive battery terminal. The fuel
solenoid should make a definite click
when the hold-in coil is de-energized.
d. If the hold-in coil does not function
properly, check the resistance of the
hold-in coil by placing an ohmmeter
between the red wire (8D—pin A) and the
black wire (CH—pin C) in the fuel
solenoid connector. The resistance of the
hold-in coil should be 24 to 29 ohms. If
the resistance of the hold-in coil is not in
this range, replace the fuel solenoid.
e. If the hold-in coil does function properly,
go to step 9.
9. Reconnect the fuel solenoid connector and the
main wire harness connector.
10. Remove the fuel solenoid relay from its socket
and make sure the Zone 1/Host On/Off switch
is in the On position and the unit is in the
Relay Board Test Mode [RUNR].
11. Check the voltage on the 8D circuit at the 85
terminal in the fuel solenoid relay socket.
Refer to the following illustration to identify
the terminals in the relay socket.
a. If battery voltage is not present on the 8D
circuit, check the 8D circuit and the
related circuits and components for a fault
(minimum voltage is 10 volts).
b. If battery voltage is present on the 8D
circuit, go to step 12.
12. Check the voltage on the 2A circuit at the 30
terminal in the fuel solenoid relay socket.
a. If voltage is not present on the 2A circuit,
check the 2A circuit for an open or a short.
1. 30 Terminal—2B Circuit
2. 85 Terminal—8D Wire
3. 87 Terminal—8DP Wire
4. 86 Terminal to Capacitor and Diode
Figure 40: Relay Socket Terminal Identification
AEA634