Map Sensor - Sym RV 250i Service Manual

MAP Sensor

Y/B B/R
Working voltage
measurement
Output voltage measurement
plains
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Functional Description:
Powered by 5V DC from ECU. It has 3-pin socket on the sensor. One
●
terminal is for power, and 1 terminal are for signal output. And, the
rest one is for ground.
The major component of the intake pressure sensor is a variable
●
transistor IC. Its reference voltage is DC 5V, and output voltage range
is DC 0~5V.
It is a sensor by sensing pressure, and can measure the absolute
●
pressure in intake process. It also conducts fuel injection quantity
correction based on environmental position level.
Pin Wire color
Left Yellor / Black
center Black / Red
Right Green / Red
Testing Procedures:
1. Inlet pressure sensor connector to properly (using the probe tool).
G/R
2. Open the main switch, but not to start engine.
3. Use "volteg meter" DC stalls (DCV) to check inlet pressure sensor
voltage.
4. Confirmed working voltage:
Volteg meter negative access to the inlet pressure sensor third pin
●
(Green / Red).
Voltage meter positive access to the inlet pressure sensor first pin
●
(Yellow / Black).
5. Confirmed plains output voltage values:
Volteg meter negative access to the inlet pressure sensor third pin
●
(Green / Red).
Voltage meter positive access to the inlet pressure sensor second
●
pin (Black / Red)
Cautions
Attentions to the tools required close to the probe wire waterproof
●
apron penetrate skin and internal terminal before measurements to
the correct value.
Detection judge:
Working voltage value:
●
Plains output voltage values:
●
101.3 kPa Measurement)
Cautions
The higher the altitude, the measurement value to the lower voltage.
●
Sea-level atmospheric pressure = 1Atm = 101.3kPa = 760mmHg =
●
1013mbar
Treatment of abnormal phenomena:
Inlet pressure sensor damaged, or poor contact couplers.
●
Check whether the abnormal wire harness lines.
●
Inlet pressure sensor anomaly, the proposed replacement of the
●
sensor to measure the output voltage.
ECU anomaly, the proposed replacement of the ECU to measure the
●
working voltage.
4. Fuel Injection System
Function
5V voltage input
Signal output
Ground
5.0±0.1V
2.87±0.03V (Conditions: In the plains
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