TM 5-3805-290-23-1
ELECTRICAL SYSTEM TESTS, INSPECTIONS, AND ADJUSTMENTS - CONTINUED
0013 00
CAN DATA LINK CIRCUIT TEST - CONTINUED
4.
Check CAN data link between ECM and P40 fuel injection pump control unit connector for short circuit.
a.
Disconnect P1 from ECM.
N OT E
DO NOT disconnect P40 fuel pump connector.
b.
Measure resistance between terminal P1:58 and terminal P1:68.
c.
Measure resistance between terminal P1:48 and terminal P1:68.
d.
Expected Results. Readings should be more than 5,000 Ohms.
(1)
If reading is OK, reconnect all connectors and proceed to step 5.
(2)
If reading is NOT OK, a short circuit exists in harness between P1 ECM connector and control unit for fuel
injection pump. Replace wiring harness in question (WP 0169 00 thru WP 0175 00).
5.
Verify supply voltage at fuel injection pump.
a.
Turn engine start switch to OFF position (TM 5-3805-290-10).
b.
Disconnect P40 connector from fuel injection pump (WP 0164 00).
c.
Turn engine start switch to ON position (TM 5-3805-290-10).
d.
Measure voltage between terminal J40:7 and terminal J40:6.
e.
Turn engine start switch to OFF position (TM 5-3805-290-10).
f.
Reconnect P40 connector.
g.
Expected Results. Voltage should be constant. Voltage should be between 22.0 and 27.0V.
(1)
If voltage is OK, perform this repair:
Replace suspect ECM (WP 0053 00). Verify repair eliminates problem.
(2)
If voltage is NOT OK (no voltage or voltage is less than permissible limit), refer to Fuel Injection Pump
Circuit Test in this work package. Reconnect fuel injector pump connector (WP 0164 00). Verify repair has
eliminated fault.
0013 00-13