TM 5-3805-291-23-1
ELECTRICAL SYSTEM TESTS, INSPECTIONS, AND ADJUSTMENTS - CONTINUED
0013 00
ENGINE PRESSURE SENSOR OPEN OR SHORT CIRCUIT TEST - CONTINUED
Expected Results. An 04 diagnostic code was active before sensor was disconnected. An 03 diagnostic code
f.
became active after sensor was disconnected.
(1)
If results are OK, install a new sensor. Verify there are no active diagnostic codes for sensor. Clear any
logged diagnostic codes.
(2)
If results are not OK, when sensor is disconnected, an 04 diagnostic code remains active for suspect sen-
sor. There is a short circuit between sensor harness connector and ECM. Leave sensor disconnected. Pro-
ceed to step 6.
5.
Create a short at suspect sensor connector.
a.
Place battery disconnect switch in OFF position (TM 5-3805-291-10).
b.
Fabricate a jumper wire long enough to connect two terminals at sensor connector. Crimp connector sockets to
each end of jumper wire.
c.
Install jumper wire between terminal B (sensor return) and terminal C (sensor signal) on harness side of connector
for suspect sensor.
d.
Place battery disconnect switch in ON position (TM 5-3805-291-10).
N OT E
Wait at least 30 seconds for activation of diagnostic code.
e.
Monitor Active Diagnostic Codes screen on ET before installing jumper wire and after installing jumper wire.
f.
Check for an active short circuit diagnostic code 04 while jumper wire is installed.
g.
Place battery disconnect switch in OFF position (TM 5-3805-291-10).
h.
Remove jumper wire.
Expected Results. An 04 diagnostic code was active when jumper wire was installed. An 03 diagnostic code
i.
became active when jumper wire was removed.
(1)
If results are OK, engine harness and ECM are OK. Install a new sensor in engine. Verify there are no
active diagnostic codes for sensor. Clear any logged diagnostic codes.
(2)
If results are not OK, an 03 diagnostic code remains active with jumper in place. There is a problem in cir-
cuit between ECM and sensor connector. There may be a problem with ECM. Proceed to step 6.
6.
Test operation of ECM.
a.
Place battery disconnect switch in OFF position (TM 5-3805-291-10).
b.
Fabricate a jumper wire long enough to connect one terminal at ECM connector to engine ground stud. Crimp a
connector socket to one end of jumper wire.
c.
Disconnect appropriate ECM connector for signal wire of suspect sensor.
d.
Remove signal wire for suspect sensor from ECM connector.
e.
Install jumper wire into terminal location of suspect sensor's signal wire at ECM connector.
f.
Connect ECM connectors.
0013 00-32
