TM 5-3805-290-23-1
ELECTRICAL SYSTEM TESTS, INSPECTIONS, AND ADJUSTMENTS - CONTINUED
0013 00
FUEL INJECTION PUMP CIRCUIT TEST - CONTINUED
(a) Verify voltage is present at test point A on fuel injection pump power relay. If voltage is not present on
test point A on fuel injection pump power relay, verify fuse is not blown and/or repair wiring between
test point A and +battery.
(b) If voltage is present at test point A, proceed to step 6.
(2)
If result is NOT OK, voltage was not present on test point D of fuel injection pump power relay.
(a) Measure voltage at test point C of fuel injection pump power relay. If voltage is present on test point C
of fuel injection pump power relay, replace fuel injection pump power relay (WP 0054 00).
(b) If voltage is not present on test point C of fuel injection pump power relay, verify fuse is not blown
and/or repair wiring between test point C and +battery by replacing wiring harness in question (WP
0169 00 thru WP 0175 00).
6.
Check sinking driver for fuel injection pump power relay at ECM.
a.
Turn engine start switch to OFF position (TM 5-3805-290-10).
b.
Disconnect ECM connector P1 (WP 0053 00).
c.
Remove wire from ECM connector P1:42 pump power control. Install jumper wire into socket for P1:42 Pump
Power Control.
d.
Connect multimeter between wire jumper in P1:42 Pump Power Control and +battery terminal.
e.
Turn engine start switch to ON position (TM 5-3805-290-10).
f.
Measure voltage between wire jumper in P1:42 Pump Power Control and +battery terminal.
g.
Turn engine start switch to OFF position.
h.
Remove jumper wire from P1:42 Pump Power Control.
i.
Connect P1 (WP 0053 00).
j.
Expected Results. Measured voltage is between 22 and 27 VDC with engine start switch in ON position and at
0 VDC with engine start switch in OFF position.
(1)
If result is OK, sinking driver for fuel injection pump power relay is operating correctly. Repair wire
between P1:42 Pump Power Control and test point D on fuel injection pump power relay, by replacing wir-
ing harness in question (WP 0169 00 thru WP 0175 00). Problem may be at P20:42 Pump Power Control
of machine interface connector. Connect wire that was removed from P1:42 Pump Power Control. Recon-
nect ECM connector P1.
(2)
If result is NOT OK, sinking driver for fuel injection pump power relay is not operating correctly. If prob-
lem is resolved, replace ECM (WP 0053 00).
0013 00-57
