TM 5-3805-290-23-1
ELECTRICAL SYSTEM TESTS, INSPECTIONS, AND ADJUSTMENTS - CONTINUED
0013 00
CAT DATA LINK CIRCUIT TEST - CONTINUED
3.
Check battery voltage at ECM.
a.
Ensure MSD is connected to J80 diagnostic con-
nector.
b.
Disconnect ECM connector P1 from ECM con-
nector J1 (WP 0053 00).
c.
Connect 70-pin breakout T to ECM harness.
d.
Turn engine start switch to ON position (TM 5-
3805-290-10).
e.
Measure voltage on P1 between sockets P1:56
(unswitched positive batt) and P1:68 (-batt).
f.
Measure voltage on P1 between sockets P1:57
427-B0681
(unswitched batt) and P1:69 (-batt).
g.
Measure voltage on P1 between sockets P1:70
(engine start switch) and P1:68 (-batt).
h.
Expected Results. Voltage is between 22 VDC and 27 VDC when engine start switch is in ON position.
(1)
If voltage is as specified, ECM is currently receiving correct voltage. Connect ECM and proceed to step 5.
(2)
If voltage is not as specified, ECM is not receiving correct voltage. Perform Electrical Power Supply Cir-
cuit Test in this work package.
427-B0678
4.
Check battery voltage to data link connector.
a.
Turn engine start switch to ON position (TM 5-
3805-290-10).
b.
Use multimeter to measure voltage between pin
A positive batt and pin B for negative batt on
data link connector.
427-B0682
0013 00-16