TM 5-2420-231-23-1
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Table 1. 4-Wheel Drive (4WD) Does Not Engage - Continued.
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MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
NOTE
4-Wheel Drive (4WD) Does
Not Engage - Continued
Ensure that the brake pedal lock lever is engaged during this test (TM 5-
2420-231-10).
5. Apply and hold brake pedal (Fig-
ure 4, Item 1) (TM 5-2420-231-10).
6. Using front display screen (WP
Front Display Screen Illuminates the
0006), monitor and record brake
Brake Pressure Switch Input -
pressure switch input.
Release brake pedal.
Proceed to Test Step 16.
Front Display Screen Does Not
Illuminate the Brake Pressure Switch
Input - Release brake pedal.
Proceed to Test Step 18.
Figure 4. Brake Pedal.
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Test Step 3. Test for an Open 4WD
Fuse.
1. Turn ignition switch to the off posi-
tion (TM 5-2420-231-10) and dis-
connect batteries (WP 0157).
2. Remove 4WD fuse (TM 5-2420-
231-10).
3. Using a digital multimeter, mea-
Resistance 5.0 Ohms or Less -
Proceed to Test Step 4.
sure resistance between terminals
of fuse. Resistance should be 5.0
Resistance Greater Than 5.0 Ohms -
Fuse open.
ohms or less.
Proceed to Test Step 10.
