Honda BF135A Manual page 218

3. Sensor check
-1. Turn the ignition switch ON.
-2. Disconnect the MAP sensor 3P connector and check
the MIL.
Does the MIL go OFF?
YES – Replace the MAP sensor.
NO – Go to the step 3.
-3. Connect the MAP sensor 3P connector.
-4. Disconnect the TP sensor 3P connector and check the
MIL.
Does the MIL go OFF?
YES – Replace the TP sensor.
NO – Go to the step 5.
-5. Connect the TP sensor 3P connector.
-6. Disconnect the BARO sensor 3P connector and check
the MIL.
Does the MIL go OFF?
YES – Replace the BARO sensor.
NO – Go to the step 7.
-7. Turn the ignition switch OFF and connect the test har-
ness.
-8. Check for the continuity between the test harness B-4
terminal and the engine ground with the ECM connec-
tor A disconnected.
Is there the continuity?
YES – Repair open in the main harness between the
ECM and the MAP sensor.
NO – Go to the step 9.
5-65
B-4
-9. With the ECU connector A disconnected, check for the
continuity between the test harness A-12 terminal and
the engine ground.
Is there the continuity?
YES – Repair open in the wire between the ECM
and the BARO sensor.
NO – Perform "4. ECM main power supply line
check".
4. ECM main power supply line check
-1. Connect the ECM connector A.
-2. Check for the continuity between the test harness C-1
terminal and the respective terminals of A-1 and B-17
terminals.
Measure the voltage between the test harness C-5 ter-
minal and the respective terminals of A-1 and B-17 ter-
minals.
A-1
C-1
C-5
Is there the continuity?
YES – Substitute a known-good ECM and recheck.
NO – Check the PGM-FI main relay harness (P . 5-
97).
BF135A•BF150A
A-12
B-17