Honda CBF190WH 2016 Shop Manual page 94

DTC TROUBLESHOOTING
DTC 1-1 (MAP SENSOR LOW VOLTAGE)
• Fuel tank shroud 3-6
MAP Sensor Diagram
Sensor unit 5P connector
G/W
Sensor unit
(MAP sensor)
1. MAP Sensor System Inspection
• Check the MAP sensor voltage with MCS.
• Is the voltage about 0 V indicated?
Yes ▼
2. Sensor unit Power Input Voltage Inspection
• Connection: Y/R (+) – G/W (–)
• Is the voltage within 4.75 – 5.25 V?
Yes ▼
3. MAP Sensor Output Voltage Inspection
• Connection: Lg/Y (+) – G/W (–)
• Is the voltage within 3.80 – 5.25 V?
No ▼
4. MAP Sensor Output Line Inspection
• Check a short circuit in Lg/Y wire.
• If there is no short circuit, replace the ECM with a
new one 4-19, and recheck.
Y/R
Lg/Y
Y/R
Lg/Y
G/W
No
►
No
►
Yes
►
ELECTRICAL SYSTEM
ECM 33P connector
Y/R
Lg/Y
5 V
VCC
5 V
PB
SG
• Intermittent failure
• Loose or poor contact at the connector
• Open or short circuit in Y/R wire
• If there is no open or short circuit, replace the ECM
with a new one 4-19, and recheck.
• Replace the sensor unit (MAP sensor) with a new
one 2-8, and recheck.
G/W
ECM
4-5