TM 5-2420-231-23-1
0061
Table 1. 4-Wheel Drive (4WD) Does Not Engage - Continued.
061
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
2. Using a digital multimeter, mea-
4-Wheel Drive (4WD) Does
Resistance 5.0 Ohms or Less -
sure resistance between power-
Proceed to step 3.
Not Engage - Continued
shift wiring harness connector (WP
Resistance Greater Than 5.0 Ohms -
0007, Figure 200) terminal A and
Replace powershift wiring harness (WP
powershift wiring harness connec-
0167).
tor (WP 0007, Figure 202) terminal
Proceed to Test Step 22.
B. Resistance should be 5.0 ohms
or less.
3. Using a digital multimeter, mea-
Resistance 5.0 Ohms or Less -
sure resistance between power-
Proceed to Test Step 21.
shift wiring harness connector (WP
Resistance Greater Than 5.0 Ohms -
0007, Figure 200) terminal B and
Replace powershift wiring harness (WP
machine ground. There should be
0167).
no continuity.
Proceed to Test Step 22.
Test Step 21. Test Brake Pressure
Switches.
1. Using a digital multimeter, test for
Continuity - Replace right-hand brake
continuity between right-hand
pressure switch (WP 0169).
brake pressure switch (WP 0007,
Proceed to Test Step 22.
Figure 201) terminals A and B.
No Continuity - Proceed to step 2.
There should be no continuity.
2. Have an assistant apply and hold
the brake pedal (TM 5-2420-231-
10).
3. Using a digital multimeter, mea-
Resistance 5.0 Ohms or Less -
sure resistance between right-
Release parking brake.
hand brake pressure switch (WP
Proceed to step 4.
0007, Figure 201) terminals A and
Resistance Greater Than 5.0 Ohms -
B. Resistance should be 5.0 ohms
Replace right-hand brake pressure
or less.
switch (WP 0169).
Proceed to Test Step 22.
4. Using a digital multimeter, test for
Continuity - Replace left-hand brake
continuity between left-hand brake
pressure switch (WP 0169).
pressure switch (WP 0007, Figure
Proceed to Test Step 22.
203) terminals A and B. There
No Continuity - Proceed to step 5.
should be no continuity.
5. Have an assistant apply and hold
the brake pedal (TM 5-2420-231-
10).
6. Using a digital multimeter, mea-
Resistance 5.0 Ohms or Less -
sure resistance between left-hand
Replace transmission controller (WP
brake pressure switch (WP 0007,
0168).
Figure 203) terminals A and B.
Proceed to Test Step 22.
Resistance should be 5.0 ohms or
Resistance Greater Than 5.0 Ohms -
less.
Replace left-hand brake pressure
switch (WP 0169).
Proceed to Test Step 22.
0061-17
