TM 5-2420-231-23-1
0043
Table 1. Display and/or Backup Alarm Does Not Turn On - Continued.
043
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
2. Disconnect powershift lever
Display and/or Backup
reverse diode from front console
Alarm Does Not Turn On -
wiring harness connector (WP
Continued
0007, Figure 111).
3. Using a digital multimeter, mea-
Resistance 5.0 Ohms or Less -
sure resistance between front con-
Proceed to Test Step 16.
sole wiring harness connector (WP
Resistance Greater Than 5.0 Ohms -
0007, Figure 111) terminal 52 and
Proceed to Test Step 17.
front console wiring harness con-
nector (WP 0007, Figure 107) ter-
minal I. Resistance should be 5.0
ohms or less.
Test Step 16. Check for Faulty
Powershift Lever Reverse Diode.
1. Using a digital multimeter in diode
Digital Reading- Proceed to step 2.
test position, test for continuity
No Reading or OL- Replace powershift
between powershift lever reverse
lever reverse diode (WP 0007, Figure
diode (WP 0007, Figure 111) termi-
111).
nals 25B (positive multimeter lead)
Proceed to Test Step 30.
and 52 (negative meter lead).
There should be continuity.
2. Using a digital multimeter in diode
Digital Reading- Replace powershift
test position, test for continuity
lever reverse diode (WP 0007, Figure
between powershift lever reverse
111).
diode (WP 0007, Figure 111) termi-
Proceed to Test Step 30.
nals 52 (positive multimeter lead)
No Reading or OL- Replace front
and 25B (negative multimeter
console wiring harness (WP 0162).
lead). There should be no continu-
Proceed to Test Step 30.
ity.
Test Step 17. Check for Faulty
Shuttle Interlock Relay.
1. Disconnect shuttle interlock relay
(WP 0007, Figure 110) from front
console wiring harness connector
(WP 0007, Figure 109).
2. Using a digital multimeter, mea-
Resistance 5.0 Ohms or Less -
sure resistance between shuttle
Replace front console wiring harness
interlock relay (WP 0007, Figure
(WP 0162).
110) terminals 30 and 87a. Resis-
Proceed to Test Step 30.
tance should be 5.0 ohms or less.
Resistance Greater Than 5.0 Ohms -
Replace shuttle interlock relay (WP
0007, Figure 110).
Proceed to Test Step 30.
Test Step 18. Check for Faulty
Transmission Control Fuse.
1. Turn ignition switch to the off posi-
tion (TM 5-2420-231-10) and dis-
connect batteries (WP 0157).
0043-10