TOHATSU BFT250A Service Manual page 105

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5. IAB control solenoid valve inspection
Check operation of the IAB control solenoid valve (page 5-118).
Is the IAB system operating correctly?
YES
NO
6. VTEC system inspection
Inspect the following VTEC system:
– Solenoid valve (page 5-125)
– System operation (page 14-37)
Is the VTEC system operating properly?
YES
NO
7. Cylinder Compression
Check the cylinder compression (page 14-33).
Is the compression low?
YES
NO
ENGINE SPEED INCREASES EXCESSIVELY
1. Propeller inspection
Check the propeller.
Is the propeller correct?
YES
NO
2. Outboard motor installation inspection
Inspect the outboard motor installation (Transom height/tilt angle).
Is the outboard motor installation correct?
NO
– GO TO STEP 6.
– Faulty IAB control solenoid valve
– GO TO STEP 7.
– Faulty VTEC system.
– Check the valve clearance and recheck. If compression is out of specification in one or more
cylinders, perform a leak down test before removing components.
– Replace the ECM with a new one and recheck.
– GO TO STEP 2.
– • Propeller mismatched
• Faulty propeller
– Faulty outboard motor installation.
TROUBLESHOOTING
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