Honda BF135A Manual page 193

BF135A•BF150A
DTC 13-2: BARO 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. Measure the BARO sensor (PA) voltage using the
HDS pocket tester.
Is the measurement voltage 1.58 – 4.49V?
YES – Temporary failure (Disappeared)
NO – Perform "2. BARO sensor power line check".
2. BARO sensor power line check
-1. Turn the ignition switch OFF and disconnect the BARO
sensor 3P connector.
-2. Turn the ignition switch ON. Measure the voltage
between the No. 3 (Brown/White) and the No. 1
(Green/Red) terminals of the BARO sensor harness
side 3P connector.
BARO SENSOR HARNESS
SIDE 3P CONNECTOR
SG2
(GREEN/RED)
VIEWED FROM THE
TERMINAL SIDE
Is the measurement voltage 4.75 – 5.25V?
YES – Perform "4. BARO sensor signal line open cir-
cuit check".
NO – Perform "3. BARO sensor power line open cir-
cuit check".
3. BARO sensor power line open circuit check
-1. Turn the ignition switch ON. Measure the voltage
between the No. 3 (Brown/White) terminal of the
BARO sensor harness side 3P connector and the
engine ground.
BARO SENSOR HARNESS
SIDE 3P CONNECTOR
VIEWED FROM THE
TERMINAL SIDE
VCC2
(BROWN/WHITE)
VCC2 (BROWN/WHITE)
Is the measured voltage 4.75 – 5.25V?
YES – Repair open in the wire between the BARO
sensor and the engine ground.
NO – Repair open in the wire between the BARO
sensor and the ECM.
4. BARO sensor signal line open circuit check
-1. Turn the ignition switch ON. Measure the voltage
between the No. 2 (White/Blue) terminal of the BARO
sensor harness side 3P connector and the engine
ground.
BARO SENSOR HARNESS
SIDE 3P CONNECTOR
VIEWED FROM THE
TERMINAL SIDE
Is the measured voltage 4.75 – 5.25V?
YES – Perform "5. BARO sensor check".
NO – Repair open in the wire between the BARO
sensor and the ECM.
5. BARO sensor check
-1. Turn the ignition switch OFF and connect the BARO
sensor connector.
-2. Turn the ignition switch ON and measure the BARO
sensor voltage using the HDS pocket tester.
Is the measured voltage 2.76 – 2.96V?
YES – Substitute a known-good ECM and recheck.
NO – Replace the BARO sensor and recheck.
PA (WHITE/BLUE)
5-40