TOHATSU BFT75A Service Manual page 175

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FUEL SYSTEM
DTC 21-1 (VTEC SOLENOID VALVE FAILURE)
ECM
12 V
VTS
1. Symptom reproduction test
Turn the combination switch OFF.
Disconnect the VTEC solenoid valve 1P connector
them.
Clear the DTC (page 5-5).
• Continue the procedure if the DTC does not
clear.
Start the engine and let it run at 3,000 min
5 minutes or more under no load.
Disconnect the neutral switch 2P connector
Raise the engine speed slowly and let it run at 5,200
min -1
Recheck the DTC with the Dr.H.
Does the DTC 21-1 appear?
YES
NO
2. VTEC solenoid valve inspection
Turn the combination switch OFF.
Inspect the VTEC solenoid valve
(page 5-107).
Is the VTEC solenoid valve correct?
YES
NO
5-34
G/Y
28
, ECM connector B and then reconnect
(rpm) for a few seconds.
– GO TO STEP 2.
– Temporary failure (code
reappear).
– Repair open or short in the main wire
harness between the ECM and VTEC
solenoid valve. If main wire harness is
correct, replace the ECM with a new one
and recheck.
– Replace the VTEC solenoid valve with a
new one and recheck.
11
G/W
-1 (rpm) for
.
does not
VTEC
SOLENOID
VALVE
Bl BLACK Br BROWN
Y YELLOW O ORANGE
Bu BLUE Lb LIGHT BLUE
G GREEN Lg LIGHT GREEN
R RED P PINK
W WHITE Gr GRAY