12
Test Procedures
TROUBLESHOOTING AND ELECTRICAL
SYSTEM: DIESEL VEHICLES
Voltage to Fan Motor
1.
Disable the vehicle.
See Disabling the Vehicle on page 1-3.
2.
Raise the hood.
3.
Disconnect the two-pin connector from the fan motor
.
4.
Disconnect the two-pin connector from the thermostat switch
.
5.
Place a jumper wire between the frame and the 18-gauge yellow/black wire at the two-pin connector disconnected
from the thermostat switch.
6.
Set a multimeter to measure 20 VDC.
7.
Place the multimeter probes into each terminal of the two-pin connector disconnected from the fan motor (wire
harness side).
2117
Figure 12-18
Fan Motor Connector
2118
Figure 12-19
Thermostat Switch Connector
8.
Connect the battery cables, positive (+) cable first.
9.
Leave the Forward/Reverse handle in the NEUTRAL position.
10.
Monitor the multimeter while turning the key switch to the ON position. The multimeter should indicate 0 (zero)
VDC with the key in the OFF position and approximately 12 VDC with the key switch in the ON position.
11.
If the voltage reading is approximately 12 VDC with the key switch in the OFF position, check the fan relay for
proper wiring and function.
See Test Procedure 9 – Fan Relay on page 12-20.
12.
If the voltage reading is not approximately 12 VDC with the key switch in the ON position, check the following:
– Diode 2 for failure in closed condition.
See Test Procedure 14 – Diode 2 on wire 40 on page 12-27.
– Fan relay for proper wiring and function.
See Test Procedure 9 – Fan Relay on page 12-20.
– Both 30-amp fuses (on wires w109 and w125).
See Test Procedure 2 – Fuse on page 12-13.
– Key switch.
See Test Procedure 5 – Key Switch (ON Position) on page 12-16.
– Connections and wire continuity for wires w112, w44, w52, w51, w107, w109, w114, w146, w125, w24, and w48.
Page 12-24
2016 Carryall 1500/1700 and XRT 1550 Maintenance and Service Manual
Summary of Contents for Carryall 1500 2016
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