Honda NSS250S Manual page 203

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3. MAP Sensor Output Voltage Inspection 2
Turn the ignition switch OFF.
Disconnect the sensor unit 5P (Black) connector.
Turn the ignition switch ON and engine stop
switch " ".
Measure the voltage at the wire side.
CONNECTION:
Yellow/orange (+) – Green/orange (–)
STANDARD:
4.75 V – 5.25 V
Is the voltage within 4.75 – 5.25 V?
YES – Faulty sensor unit (MAP sensor)
NO – GO TO STEP 4.
4. MAP Sensor Output
Inspection
Turn the ignition switch OFF.
Check the continuity between the sensor unit 5P
connector terminal of the wire side and ground.
CONNECTION: Yellow/orange – Ground
Is there continuity?
YES – Short circuit in Yellow/orange wire
NO – GO TO STEP 5.
5. MAP Sensor Output
Inspection 2
Check the continuity between the test harness
and sensor unit 5P connector of the wire side.
CONNECTION: 27 – Yellow/orange
Is there continuity?
YES – Replace the ECM with a known good
one, and recheck.
NO – Open circuit in Yellow/orange wire
SENSOR UNIT 5P CONNECTOR
(Wire side/female terminals)
Line Short Circuit
SENSOR UNIT 5P CONNECTOR
(Wire side/female terminals)
Line Open Circuit
TEST HARNESS PIN BOX
FUEL SYSTEM (PGM-FI)
Green/orange
Yellow/orange
Yellow/orange
(27)
SENSOR UNIT 5P CONNECTOR
(Wire side/female terminals)
Yellow/orange
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