TOHATSU BFT 250A, Service Manual

Page: 157 / 639

5-35
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FUEL SYSTEM
DTC 21-1 (ABNORMAL OUTPUT OF VTEC SPOOL SOLENOID VALVE)
1. Symptom reproduction test
Turn the combination switch OFF.
Disconnect the VTEC spool solenoid valve 1P
connector
, ECM connector B and then
reconnect them.
Clear the DTC (page 5-6).
• Continue the procedure if the DTC does not
clear.
Start the engine and let it run at 3,000 min -1 (rpm) for
5 minutes or more under no load.
Disconnect the neutral switch 2P connector .
Raise the engine speed slowly and let it run at 4,500
min
-1
(rpm) for a few seconds.
Recheck the DTC with the HDS.
Does the DTC 21-1 appear?
YES – GO TO STEP 2.
NO – Temporary failure (code does not
reappear).
2. VTEC spool solenoid valve inspection
Turn the combination switch OFF and disconnect
the VTEC spool solenoid valve 1P connector
.
Inspect the VTEC spool solenoid valve (page 5-
125).
Is the VTEC spool solenoid valve correct?
YES – Repair open in the main wire harness
between the ECM and VTEC spool
solenoid valve. If main wire harness is
correct, replace the ECM with a new one
and recheck.
NO – Replace the VTEC spool solenoid valve
with a new one and recheck.
Bl: Black
Y: Yellow
Bu: Blue
G: Green
R: Red
W: White Br: Brown
O: Orange
Lb: Light blue
Lg: Light green
P: Pink
Gr: Gray
ECM
VTEC
SPOOL
SOLENOID
VALVE
G/Y
12 V
10
VTS G/Y
1
G/W G/W