Honda BF40D Mode D'emploi page 416

• MAP SENSOR TROUBLESHOOTING
DTC 3-1: MAP sensor voltage is too low
1) Symptom reproduction test
a. Turn the combination switch OFF. Disconnect the
MAP sensor 3P connector
again.
b. Clear the DTC (P. 5-12).
• Continue the procedure when the DTC does not
clear.
c. Turn the combination switch ON. Measure the MAP
sensor voltage using the HDS (Dr. H or pocket
tester).
Is there 0.23 - 4.5V?
YES - Temporary failure (Disappears.)
NO - Go to "2) MAP sensor power line open-circuit
inspection."
2) MAP sensor power line open-circuit inspection
a. Turn the combination switch OFF and disconnect
the MAP sensor 3P connector
b. Turn the combination switch ON. Measure the
voltage between the MAP sensor 3P connector
main wire harness side No.1 (Brown/Yellow)
terminal and the engine ground
MAP SENSOR 3P CONNECTOR
MAIN WIRE HARNESS SIDE
VIEWED FROM THE
TERMINAL SIDE
5-21
once and connect it
3
.
3
3
3
VCC1
(Brown/Yellow)
416
Is there 4.75 - 5.25V?
YES - Go to "3) MAP sensor signal line short-circuit
inspection."
NO - Repair open in the main wire harness
between the ECM and the MAP sensor.
3) MAP sensor signal line short-circuit inspection
• Turn the combination switch OFF. Disconnect the
ECM connector A . Check for continuity between
9
the MAP sensor 3P connector
harness side No.2 (White/Red) terminal and the
engine ground.
MAP SENSOR 3P CONNECTOR
MAIN WIRE HARNESS SIDE
VIEWED FROM THE
TERMINAL SIDE
Is there continuity?
YES - Repair short in the main wire harness
between the ECM and the MAP sensor.
NO - Go to "4) MAP sensor inspection."
4) MAP sensor inspection
a. Connect the ECM connector A
MAP sensor with a new one. Connect the MAP
sensor 3P connector
3
b. Turn the combination switch ON. Measure the MAP
sensor voltage using the HDS (Dr. H or pocket
tester).
Is the measurement 2.76 - 2.96V?
YES - End of inspection
NO - Replace the ECM with a new one and
recheck.
main wire
3
3
PB (White/Red)
9 . Replace the
.