TM 5-3805-291-23-1
ELECTRICAL SYSTEM TESTS, INSPECTIONS, AND ADJUSTMENTS - CONTINUED
0013 00
ENGINE PRESSURE SENSOR OPEN OR SHORT CIRCUIT TEST - CONTINUED
N OT E
Original diagnostic code may not stay active. Anopen circuit diagnostic code for sensor supply
may become active when all sensors are disconnected. Ignore active codes at this time and con-
tinue with this test step.
Be sure to wiggle harness during following measurements to reveal anintermittent condition.
d.
Measure voltage between terminals A and B at each sensor connector on wiring harness.
e.
Place battery disconnect switch in OFF position (TM 5-3805-291-10).
f.
Connect all sensors.
g.
Each voltage measurement is 5.0 0.2 VDC.
Expected Results. Each voltage measurement is 5.0 0.2 VDC.
h.
(1)
If results are OK, voltage is correct at sensor connectors. Proceed to step 3.
If results are not OK, voltage is not 5.0 0.2 VDC. Voltage is incorrect. Perform 5V Engine Pressure Sen-
(2)
sor Supply Circuit Test in this work package.
3.
Check for active diagnostic codes.
a.
Connect ET to diagnostic connector (WP 0005 00).
b.
Place battery disconnect switch in ON position (TM 5-3805-291-10).
N OT E
Wait at least 30 seconds for any codes to become active.
c.
Monitor Active Diagnostic Code screen on ET. Look for active diagnostic code for engine pressure sensor.
d.
Determine if problem is related to open circuit diagnostic code 03 or short circuit diagnostic code 04.
Expected Results. No diagnostic codes are active.
e.
N OT E
Problem may have been related to a faulty connection in harness. Carefully reinspect connectors and wir-
(1)
If results are OK, no diagnostic codes are active for engine pressure sensors.
(2)
If results are not OK, an 03 diagnostic code is active at this time. Proceed to step 5.
(3)
If results are not OK, an 04 diagnostic code is active at this time. Proceed to step 4.
4.
Disconnect suspect sensor to create an open circuit.
a.
Place battery disconnect switch in OFF position (TM 5-3805-291-10).
b.
Disconnect harness connector of sensor with an 04 diagnostic code.
c.
Place battery disconnect switch in ON position (TM 5-3805-291-10).
N OT E
Wait at least 30 seconds for any codes to become active.
d.
Use ET to check for active diagnostic codes. Check for an active 03 diagnostic code for disconnected sensor.
e.
Place battery disconnect switch in OFF position (TM 5-3805-291-10).
0013 00-31
