TM 5-3805-290-23-1
ELECTRICAL SYSTEM TESTS, INSPECTIONS, AND ADJUSTMENTS - CONTINUED
0013 00
FUEL INJECTION PUMP CIRCUIT TEST - CONTINUED
(2)
If intermittent voltage or voltage is out of range, there is problem in wiring between fuel injection pump
power relay and fuel pump control. Perform these steps:
(a) Turn engine start switch to ON position (TM 5-3805-290-10).
(b) Measure voltage between engine ground and 1 (+) Batt Machine on VLPM.
(c) If voltage is not present at 1 (+) Batt Machine of VLPM, measure voltage from P20:48 (+) Batt
Machine of MIC to engine ground.
(1) If voltage is present on P20:48 (+) Batt Machine of MIC, repair wire between P20:48 (+) Batt
Machine of MIC and 1 (+) Batt Machine of VLPM (WP 0022 00).
(2) If voltage is not present on P20:48 (+) Batt Machine of MIC, repair wire between test point B of
fuel injection pump power relay and P20:48 (+) Batt Machine of MIC (WP 0022 00).
(d) If voltage is present at 1 (+) Batt Machine of VLPM, measure voltage from 2 (+) Batt Pump of VLPM
to engine ground.
(e) If voltage is present on 2 (+) Batt Pump of VLPM, repair wire between 2 (+) Batt Pump of VLPM and
P40:7 Pump Supply (+) of fuel pump control.
(f) If voltage is not present on 2 (+) Batt Pump of VLPM, proceed to step 7.
5.
Check voltage from coil of fuel injection pump power relay to ECM.
a.
Turn engine start switch to OFF position (TM 5-3805-290-10).
b.
Disconnect wire from test point D on fuel injection pump power relay (WP 0054 00).
c.
Turn engine start switch to ON position (TM 5-3805-290-10).
427-B0721
d.
Measure voltage between test point D and engine ground.
e.
Turn engine start switch to OFF position.
f.
Connect wire on test point D of fuel injection pump power relay.
g.
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, voltage was present on test point D of fuel injection pump power relay.
0013 00-56
