TM 5-3805-290-23-1
THEORY OF OPERATION - CONTINUED
0003 00
ELECTRICAL SYSTEM - CONTINUED
When engine is cranking, ECM uses speed/timing sensor signal from fuel injection pump. When engine is running,
ECM uses speed/timing sensor signal from crankshaft. This speed/timing sensor is primary source of engine position.
427-B1530
12.
Pressure Sensors.
a.
Boost pressure sensor and engine oil pressure sensor are active sensors.
b.
Boost pressure sensor provides ECM with a measurement of inlet manifold pressure to control air/fuel ratio. This
will reduce engine smoke during transient conditions.
c.
Boost pressure sensor operating range is 8 to 50 psi (55 to 345 kPa).
d.
Engine oil pressure sensor provides ECM with a measurement of engine oil pressure. ECM can warn operator of
possible conditions that can damage engine, including detecting blocked oil filter.
e.
Engine oil pressure sensor operating range is 8 to 50 psi (55 to 345 kPa).
427-B1531
0003 00-26