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XDI200 Manual Version 0.1
- Page 43 -
©2017 Electromotive, Inc.
5 Wiring Sensors & Other Inputs
The
XDI200
harness has provisions to connect all of the engine devices described in this
section. Refer to this section to wire your sensors appropriately.
The following sensors use pull-to-seat connectors (feed the wire through the connector before
crimping the terminal!):
Coolant Temperature
Manifold Air Temperature
Some Throttle Position Sensors
Idle Air Control Motor
The following sensors use push-to-seat connectors (crimp the terminal to the wire before
inserting into the connector!):
Crank Sensor
Cam Sensor (if used)
MAP sensor (1-Bar sensors use green connector. 2-& 3-Bar use orange connector)
Some Throttle Position Sensors
EGO Sensor
Knock Sensor
5.1 The Manifold Air Pressure (MAP) Sensor
The MAP sensor determines the operating load of the
engine. To do so, it measures the intake manifold absolute
pressure. Since the intake manifold pressure has a direct effect
on the amount of air that the cylinders can ingest, the use of a
MAP sensor as a load-determining device is well justified.
MAP sensors are available from Electromotive in three
varieties: 1-, 2-, and 3-Bar. A 1-Bar sensor would be used on a
naturally aspirated engine, a 2-Bar sensor would be used on a
boosted engine (up to 15psi), and a 3-Bar sensor would be used on a boosted engine (up to
30psi).
The output of a MAP sensor is a 0 to +5 Volt signal. When the intake manifold pressure is
low (high vacuum), the sensor reading is low (approaching 0 Volts). This would occur during
part-throttle cruising or decelerating (engine braking). When the intake manifold pressure is high
(low vacuum), the sensor reading is high (appro5 Volts). This would occur during full
throttle operation.
Figure 40:
MAP sensor wiring.
