TM 5-3805-291-23-1
ELECTRICAL SYSTEM TESTS, INSPECTIONS, AND ADJUSTMENTS - CONTINUED
0013 00
FUEL FILTER DIFFERENTIAL PRESSURE SWITCH CIRCUIT TEST - CONTINUED
c.
Check J2/P2 ECM connector (socket-head screw) for proper torque of 60 lb-in. (7 Nm).
d.
Check J1/P1 ECM connector (socket-head screw) for proper torque of 55 lb-in. (6 Nm).
e.
Check harness and wiring for abrasion and pinch points from sensors back to ECM.
Expected Results. All connectors, pins, and sockets are completely coupled and/or inserted. Harness and wiring are
f.
free of corrosion, abrasion, and pinch points.
(1)
If results are OK, harness and wiring are OK. Proceed to step 3.
(2)
If results are not OK, replace wiring harness in question (WP 0195 00 thru WP 0201 00). Ensure seals are
properly in place and connectors are securely connected. Verify repair eliminates problem.
3.
Check switch circuit.
a.
Install a wire jumper between terminals of connector for fuel filter differential pressure switch.
b.
Start engine. Increase engine speed to high idle (TM 5-3805-291-10).
c.
Check for an event code for engine fuel filter restriction.
Expected Results. Event code is not active.
d.
(1)
If results are OK, wiring between connector and ECM is OK. Check for a plugged fuel filter. If fuel filter
is OK, replace fuel filter differential pressure switch (WP 0036 00). Verify problem is resolved.
(2)
If results are not OK, event code is still active. There is an open circuit in wiring for fuel filter differential
pressure switch between connector and ECM. Proceed to step 4.
4.
Check ECM.
a.
Place battery disconnect switch in OFF position (TM 5-3805-291-10).
b.
Disconnect J2/P2 ECM connector.
c.
Fabricate a jumper wire with Deutsch sockets on each end that is long enough to reach from ECM connector to
engine ground. Install jumper wire into socket for signal wire of fuel filter differential pressure switch.
d.
Connect jumper wire to engine ground.
e.
Start engine. Increase engine speed to high idle (TM 5-3805-291-10).
f.
Check for an event code for engine fuel filter restriction.
Expected Results. Event code is not active.
g.
(1)
If results are OK, event code is not active. There is an open circuit in wiring between connector for fuel fil-
ter differential pressure switch and ECM connector P2. Check harness connector to fuel filter differential
pressure switch for a good connection. Refer to Electrical Connector Inspection (WP 0022 00). Verify
repair eliminates problem.
(2)
If results are not OK, event code is still active. Replace ECM (WP 0057 00). Verify repair eliminates prob-
lem.
0013 00-53
