2-34
BF135A•BF150A
Replace or repair the wire har-
ness (Short in the wire har-
ness between the low pres-
sure side oil pressure switch
and ECM).
Normal (End of inspection)
Replace the oil pressure
switch.
YES
YES
YES
YES
NO
NO
NO
YES
NO
NO
YES
Disconnect the high pressure
side oil pressure switch 2P con-
nector.
Do the oil indicator light come
ON and the buzzer stop sound-
ing?
Replace or repair the wire har-
ness (Short in the wire har-
ness between the high pres-
sure side oil pressure switch
and ECM).
Substitute a known-good ECM
and recheck.
Substitute a known-good ECM
and recheck.
Start the engine.
Is the oil indicator light ON with
the engine idling?
NO
Check for short in the high pres-
sure side oil pressure switch
line.
1 Turn the ignition switch OFF.
2 Check for continuity between
the No. 1 (Green/Red) termi-
nal of the harness side oil
pressure switch 2P connec-
tor and the engine ground.
Is there continuity?
Oil pressure
switch 2P
connector
Viewing from
terminal side
Snap the engine (4,000 min
-1
/rpm or above under no load)
and check the oil indicator and
warning buzzer.
Do the oil indicator light come
ON and the buzzer stop sound-
ing?
Check for short in the low pres-
sure side oil pressure switch
line.
1 Turn the ignition switch OFF.
2 Check for continuity between
the oil pressure switch ter-
minal and the engine ground.
Is there continuity?
Disconnect the low pressure
side oil pressure switch wire.
Do the oil indicator light come
ON and the warning buzzer
stop sounding?