Baro Sensor Troubleshooting - Honda BF135A Manual

Is there the continuity?
YES – Perform "4. IAT sensor check".
NO – Repair open in the wire between the IAT sen-
sor and the engine ground.
4. IAT sensor check
-1. Turn the ignition switch OFF and connect the HDS
pocket tester.
-2. Turn the ignition switch ON and check the intake air
temperature using the HDS pocket tester.
Does the measurement correspond to the ambient
temperature?
YES – Substitute a known–good ECM and recheck.
NO – Substitute a known–good IAT sensor and
recheck.
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• BARO Sensor Troubleshooting

DTC 13-1: BARO sensor voltage is low
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 signal line short cir-
cuit check".
2. BARO sensor signal line short circuit check
-1. Turn the ignition switch OFF and disconnect the ECM
connector B.
-2. Check for the continuity between the No. 2
(White/Blue) terminal of the BARO sensor harness
side 3P connector and the body ground.
BARO SENSOR HARNESS
SIDE 3P CONNECTOR
VIEWED FROM THE
TERMINAL SIDE
Is there the continuity?
YES – Repair short in the wire between the ECM
and the BARO sensor.
NO – Perform "3. BARO sensor check".
3. BARO sensor check
-1. Turn the ignition switch OFF and connect the BARO
sensor connector and the ECM connector B.
-2. Turn the ignition switch ON. Measure the BARO sen-
sor voltage using the HDS pocket tester.
Is the measurement voltage 2.76 – 2.96V?
YES – Substitute a known-good ECM and recheck.
NO – Replace the BARO sensor and recheck.
BF135A•BF150A
PA (WHITE/BLUE)