Honda SH300I 2006, Manual

Page: 141 / 511

FUEL SYSTEM (PGM-FI)
6-31
MIL TROUBLESHOOTING
MIL 1 BLINK (MAP SENSOR)
• Before starting the inspection, check for loose or
poor contact on the sensor unit 5P (Black) con-
nector and recheck the MIL blinking.
1. MAP Sensor System Inspection
Turn the ignition switch OFF.
Connect the ECM test harness to ECM connector
(page 6-14).
Turn the ignition switch ON and engine stop
switch "
".
Measure the voltage at the test harness termi-
nals.
Is the voltage within 2.7 – 3.1 V?
YES – • Intermittent failure
• Loose or poor contact on the ECM
connector
NO – • About 5 V
GO TO STEP 2.
• About 0 V
GO TO STEP 3.
2. MAP Sensor Output Voltage Inspection
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 harness side.
Is the voltage within 4.75 – 5.25 V?
YES – Replace the sensor unit with a new one,
and recheck (Faulty MAP sensor)
NO – • Open circuit in Yellow/Orange wire
• Open circuit in Green/Orange wire
3. MAP Sensor Input Voltage Inspection
Turn the ignition switch "OFF".
Disconnect the sensor unit 5P (Black) connector.
Turn the ignition switch ON.
Measure the voltage between the sensor unit 5P
connector of the wire harness side and ground.
Is the voltage within 4.75 – 5.25 V?
YES – GO TO STEP 5.
NO – GO TO STEP 4.
Connection: A27(+) – A4 (–)
TEST HARNESS PIN BOX
Y/O
G/O
Connection: Yellow/Orange (+) – Green/Orange(–)
5P (Black) CONNECTOR
(Wire side of female terminal)
Y/O G/O
CONNECTION:Yellow/Red (+) – Ground (–)
STANDARD:
4.75 – 5.25 V
5P CONNECTOR
(Wire side of female terminal)
Y/R