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2-27
BF135A•BF150A
Yes
No
Substitute a known-good ECM and
recheck.
Yes
No
Check for short circuit in the ignition coil’s
signal line.
1 Turn the ignition switch OFF. Check for
continuity between the No. 1 (Blue,
Blue/Black, White/Green, Blue/Red) ter-
minal of the respective harness side 3P
connectors and the engine ground.
Is there continuity?
Replace the ignition coil.
Replace or repair the wire harness (Short cir-
cuit in the wire harness between the ignition
coil and the ECM).
Replace the ignition coil and recheck.
Does the engine start?
No. 1 ignition coil: Blue
No. 2 ignition coil: Blue/Black
No. 3 ignition coil: White/Green
No. 4 ignition coil: Blue/Red
Ignition coil
harness side
3P connector
Viewing from
terminal side