Honda BF135A - Page 182

5-29
BF135A•BF150A
DTC 3-2: MAP sensor voltage is high
1. Symptom reproduction test
-1. Connect the HDS pocket tester and clear the DTC
once. If the DTC can not be cleared, go on the trou-
bleshooting.
-2. Turn the ignition switch ON.
-3. Check PB voltage using the HDS pocket tester.
Is the measured voltage 0.22 – 3.15V?
YES – Temporary failure (Disappeared)
NO – Perform “2. MAP sensor power line check”.
2. MAP sensor power line check
-1. Turn the ignition switch OFF and disconnect the MAP
sensor 3P connector.
-2. Turn the ignition switch ON.
-3. Measure the voltage between the No. 3 (Brown/Yellow)
terminal and the No. 1 (Green/Red) terminal of the
MAP sensor harness side 3P connector.
Is the measured voltage 4.75 – 5.25V?
YES – Perform “5. MAP sensor signal line open cir-
cuit check”.
NO – Perform “3. MAP sensor power line open cir-
cuit check”.
3. MAP sensor power line open circuit check
-1. Turn the ignition switch OFF and disconnect the ECM
connector B.
-2. Check for the continuity between the No. 3
(Brown/Yellow) terminal of the MAP sensor harness
side 3P connector and the No. 4 (Brown/Yellow) termi-
nal of the ECM harness side connector B.
Is there the continuity?
YES – Perform “4. MAP sensor ground line open cir-
cuit check”.
NO – Repair open in the wire between the MAP
sensor and the ECM.
4. MAP sensor ground line open circuit check
-1. Check for the continuity between the No. 1
(Green/Red) terminal of the MAP sensor harness side
3P connector and the body ground.
Is there the continuity?
YES – Perform “5. MAP sensor signal line open cir-
cuit check”.
NO – Repair open in the wire between the MAP
sensor and the ECM.
5. MAP sensor signal line open circuit check
-1. Connect the ECM connector A.
-2. Turn the ignition switch ON.
-3. Measure the voltage between the No. 2 (White/Red)
terminal and the No. 1 (Green/Red) terminal of the
MAP sensor harness side 3P connector.
Is the measured voltage 4.75 – 5.25V?
YES – Perform “7. MAP sensor check”.
NO – Perform “6. MAP sensor signal line open cir-
cuit check”.
MAP SENSOR HARNESS
SIDE 3P CONNECTOR
VCC1
(BROWN/YELLOW)
VIEWED FROM THE
TERMINAL SIDE
SG1
(GREEN/RED)
ECM CONNECTOR B
MAP SENSOR
HARNESS SIDE
3P CONNECTOR
VCC1
(BROWN/YELLOW)
VIEWED FROM THE
TERMINAL SIDE
MAP SENSOR HARNESS
SIDE 3P CONNECTOR
SG1
(GREEN/RED)
VIEWED FROM THE
TERMINAL SIDE
MAP SENSOR HARNESS
SIDE 3P CONNECTOR
PB
(WHITE/RED)
SG1
(GREEN/RED)
VIEWED FROM THE
TERMINAL SIDE