Denso CRS - Page 67

Operation Section
1
–
62
(1) Crankshaft Position Sensor (Engine Speed Sensor) and Cylinder Recognition Sensor
{TDC (G) Sensor}
Crankshaft Position Sensor (Engine Speed Sensor)
• The crankshaft position sensor is installed near the crankshaft timing gear or the flywheel. The sensor unit is a MPU
(magnetic pickup) type. When the engine speed pulsar gear installed on the crankshaft passes the sensor section,
the magnetic field of the coil within the sensor changes, generating AC voltage. This AC voltage is detected by the
engine ECU as the detection signal. The number of pulses for the engine speed pulsar depends on the specifications
of the vehicle the sensor is mounted in.
Cylinder Recognition Sensor {TDC (G) Sensor}
• The cylinder recognition sensor is installed on the supply pump unit for the HP0 system, but for the HP2, HP3, or HP4
system, it is installed near the supply pump timing gear. Sensor unit construction consists of the MPU type, which is
the same as for the crankshaft position sensor, and the MRE (magnetic resistance element) type. For the MRE type,
when the pulsar passes the sensor, the magnetic resistance changes and the voltage passing through the sensor
changes. This change in voltage is amplified by the internal IC circuit and output to the engine ECU. The number of
pulses for the TDC pulsar depends on the specifications of the vehicle the sensor is mounted in.
Sensor Mounting Position (Reference)
NE+
NE-
VCC
TDC(G)
GND
TDC(G)TDC(G)-
TDC(G)
GND
VCC
NE
TDC (G)
Pulse
TDC(G)
ECU
0V
360 CA 360 CA
720 CA
Engine Speed Pulsar
TDC (G) Pulsar
Q000878E
Pulsar
(Gearless Section)
Crankshaft Position Sensor
(Engine Speed Sensor)
Cylinder Recognition Sensor
(TDC (G) Sensor)
Pulsar
For MPU
Type
For MRE
Type
MPU Type
MPU
Type
MRE Type
MRE
Type
MPU
Type
MRE
Type
External View of Sensor
Shielded
Wire
Crankshaft Position Sensor
(Engine Speed Sensor)
Cylinder Recognition Sensor
(TDC (G) Sensor)
TDC (G) Input Circuit
Engine Speed
Input Circuit
Circuit Diagram
Pulse Chart (Reference)
Engine Speed
Pulse