12
Test Procedures
TROUBLESHOOTING AND ELECTRICAL
SYSTEM: DIESEL VEHICLES
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 400-700 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 Disconnecting the Battery – Gasoline/Diesel Vehicles, Section 1, Page 1-3.
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 12-22
Disconnected Multi-Pin Connector at Key
Switch
4.
Disconnect the three-pin connector (w122, w135, w108) between the fuel solenoid and the wire harness
5.
Disconnect the bullet connector, on the gray wire (w140), between the fuel pump and the wire harness
6.
Set the multimeter to the diode test function.
Page 12-28
2008-2012 All-Wheel Drive Maintenance and Service Manual
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