Honda NSS250S Manual page 191

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3. MAP Sensor Output
Inspection
Turn the ignition switch OFF.
Disconnect the sensor unit 5P (Black) connector.
Check the continuity between the sensor unit 5P
connector of the wire side and ground.
CONNECTION: Yellow/orange – ground
Is there continuity?
YES – Short circuit in Yellow/orange wire
NO – GO TO STEP 4.
4. MAP Sensor Inspection
Replace the sensor unit with a known good one
(page 6-88).
Erase the DTC's (page 6-16).
Turn the ignition switch OFF.
Connect the sensor unit 5P (Black) connector.
Turn the ignition switch ON and engine stop
switch " ".
Check the MAP sensor with the HDS pocket
tester.
Is DTC 1-1 indicated?
YES – Replace the PCM with a known good
one, and recheck.
NO – Faulty original sensor unit (MAP sensor)
DTC 1-2 (MAP SENSOR HIGH
VOLTAGE)
1. MAP Sensor System Inspection
Turn the ignition switch ON and engine stop
switch " ".
Check the MAP sensor with the HDS pocket
tester.
Is about 5 V indicated?
YES – GO TO STEP 2.
NO – • Intermittent failure
• Loose or poor contact on the sensor
unit 5P (Black) connector
2. Sensor Unit Power Line Inspection
Check the sensor unit power line inspection
(page 6-22).
Is the sensor unit power line normal?
YES – GO TO STEP 3.
NO – Replace or repair the abnormal circuit.
Line Short Circuit
SENSOR UNIT 5P CONNECTOR
(Wire side/female terminals)
FUEL SYSTEM (PGM-FI)
Yellow/orange
6-37