TM 5-3805-291-23-1
ELECTRICAL SYSTEM TESTS, INSPECTIONS, AND ADJUSTMENTS - CONTINUED
0013 00
ENGINE PRESSURE SENSOR OPEN OR SHORT CIRCUIT TEST - CONTINUED
g.
Check operation of ECM by creating an open circuit at ECM:
(1)
Hold loose end of jumper wire away from any components in order to create an open circuit condition.
(2)
Place battery disconnect switch in ON position (TM 5-3805-291-10).
N OT E
Wait at least 30 seconds so that any codes may become active.
(3)
Monitor Active Diagnostic Code screen on ET. Check suspect sensor for an active 03 diagnostic code
while jumper wire is installed.
h.
Place battery disconnect switch in OFF position (TM 5-3805-291-10).
i.
Check operation of ECM by creating a short circuit at ECM:
(1)
Connect jumper wire to engine ground stud.
(2)
Place battery disconnect switch in ON position (TM 5-3805-291-10).
N OT E
Wait at least 30 seconds so that any codes may become active.
(3)
Monitor Active Diagnostic Code screen on ET.
(4)
Check suspect sensor for an active 04 diagnostic code while jumper wire is installed.
j.
Place battery disconnect switch in OFF position (TM 5-3805-291-10).
k.
Remove jumper wire. Return all wiring to original configuration.
Expected Results. An 03 diagnostic code is active when sensor signal wire is removed from ECM connector. An 04
l.
diagnostic code is active when signal wire is connected to engine ground stud.
(1)
If results are OK, ECM is operating properly. Problem is in harness wiring between ECM and sensor con-
nector. If code is active for more than one sensor, problem is most likely in return wire for sensor. If code
is only active for one sensor, problem is most likely in signal wire for sensor. 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.
(2)
If results are not OK, one of these conditions exists: an 03 diagnostic code is not active when sensor signal
wire is disconnected or an 04 diagnostic code is not active when wire jumper is installed. Replace ECM
(WP 0057 00). Verify problem is resolved.
0013 00-33
