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Honda CBR300RA Service Manual page 107

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PGM-FI SYSTEM
OTC TROUBLESHOOTING
OTC 1 (MAP SENSOR)
4-12
SV
SENSOR UNIT
(MAP
SENSOR)
Y/R
Lg/Y
jsv
l
G/W
Probable
cause
• Open circuit in Yellow/red
wire
between the sensor unit and ECM
• Open
or
short circuit in Light green/yellow wire between the sensor unit and ECM
• Open
circuit
in Green/white wire between the sensor unit and ECM
• Faulty sensor unit
• Faulty ECM
OTC 1-1 (MAP SENSOR LOW VOLTAGE)
1. MAP sensor system inspection
Turn the
ignition
switch ON and engine stop switch"()".
Check the MAP sensor
with
the MCS.
Is about 0 Vindicated?
YES
- GO TO STEP
2.
NO
- Intermittent failure
2.
Sensor Unit Power Line Inspection
Check the
sensor
unit power line inspection
(page
4-11
).
Is the sensor unit power line normal?
YES
- GO TO STEP
3.
NO
- Replace or repair the abnormal
circuit.
3.
MAP Sensor Output Voltage Inspection
Turn the ignition switch OFF.
Connect the ECM 33P
(Black)
connector.
Disconnect the sensor unit SP connector [1] (page
7-1 S).
Turn the ignition switch ON and engine stop switch
"O".
Measure the voltage at the sensor unit SP
connector
of the
wire
side.
Connection:
Light green/yellow(+) - Green/white (-)
Standard:
4.75 - 5.25 V
Is the voltage within 4.75- 5.25 V?
YES
- GO TO STEP
S.
NO
- GO TO STEP 4.
[1]
ECM

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