TROUBLESHOOTING AND ELECTRICAL
SYSTEM: DIESEL VEHICLES
Test Procedures
12
TEST PROCEDURE 14 – Diode 2 on wire 40
See General Warnings, Section 1, Page 1-2.
1.
Disconnect battery.
See Side-Post Battery: Disconnecting the Battery – Gasoline/Diesel Vehicles on page
1-3.
See Top-Post Battery: Disconnecting the Battery- Gasoline/Diesel Vehicles on page 1-4.
2.
Raise the hood.
3.
Disconnect the two-pin connector between the fan and the wire harness
4.
Set the multimeter to the diode test function.
5.
Connect the black (–) probe of the multimeter to the frame (ground).
6.
Connect the red (+) probe of the multimeter to the 14-gauge blue wire (w52) on the two-pin connector (wire
harness side).
7.
The reading should indicate an over limit (no continuity). If the diode conducts current (shows continuity) with
the meter probes connected as described, the diode has failed and must be replaced.
8.
Reverse the multimeter probes and note the reading. The multimeter should indicate approximately 540 mV,
however, a range of 400 to 700 mV is acceptable.
9.
If the readings obtained in the previous steps are incorrect, replace the diode.
TEST PROCEDURE 15 – Diode 3 on wire 123
See General Warnings, Section 1, Page 1-2.
1.
Disconnect battery.
See Side-Post Battery: Disconnecting the Battery – Gasoline/Diesel Vehicles on page
1-3.
See Top-Post Battery: Disconnecting the Battery- Gasoline/Diesel Vehicles on page 1-4.
2.
Raise the hood.
3.
Disconnect the multi-pin connector from the key switch
See following NOTE.
NOTE:
Failure to disconnect the multi-pin connector from the key switch will result in unreliable results when the
diodes connected to the key switch circuit are tested.
2119
Figure 12-21
Disconnected Multi-Pin Connector at Key
Switch
2016 Carryall 1500/1700 and XRT 1550 Maintenance and Service Manual
Page 12-27
Summary of Contents for Carryall 1500 2016
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