HONDA marine BF135A, Shop Manual, Page: 34 / 49

5-31
5. IAC valve line short circuit check
-1. Check for the continuity between the No. 26
(Green/White) terminal of the ECM connector B and
the engine ground, and between the No. 34 (Black)
terminal of the ECM connector B and the engine
ground.
Is there the continuity?
YES – Repair short in the wire between the ECM
and the IAC valve.
NO – Substitute a known-good ECM and recheck.
• VTEC Solenoid Valve Troubleshooting
DTC 21-1: VTEC solenoid valve output is abnormal
1. Symptom reproduction test
-1. Connect the Dr. H and clear the DTC once. If the
DTC can not be cleared, go on the troubleshooting.
-2. Start the engine and warm it up for 5 minutes by run-
ning the engine at 3,000 min -1 (rpm) under no load.
-3. Disconnect the neutral switch 2P connector.
-4. Increase the engine speed gradually and run the
engine at 4,500 min -1 (rpm) for a few seconds.
-5. Check the DTC again using the Dr. H.
Does the DTC 21-1 appear?
YES – Perform “2. Spool solenoid valve check”.
NO – Temporary failure (Disappeared)
2. Spool solenoid valve check
-1. Turn the ignition switch OFF and disconnect the
spool solenoid valve connector.
-2. Measure the resistance between the spool solenoid
valve side 1P connector (Green/White) terminal and
the body ground.
Is the measured resistance 12 – 18 ?
YES – Perform “3. VTEC signal line short circuit
check”.
NO – Replace the spool solenoid valve.
ECM CONNECTOR B
VIEWED FROM THE
TERMINAL SIDE
SOLENOID VALVE SIDE
1P CONNECTOR
VIEWED FROM THE
TERMINAL SIDE
EACVM
(BLACK)
EACVP
(GREEN/WHITE)