TOHATSU BFT 250A, Service Manual

Page: 180 / 639

5-58
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FUEL SYSTEM
2. IAC valve inspection
Turn the combination switch OFF and disconnect
the IAC valve 2P connector
.
Inspect the IAC valve (page 5-125).
Is the IAC valve correct?
YES – Repair open or short in the main wire
harness between the ECM and IAC valve.
If the main wire harness is correct, replace
the ECM with a new one and recheck.
NO – Replace the IAC valve with a new one and
recheck.
MIL BLINKS 21 TIMES (2 LONG BLINKS AND ONE SHORT BLINK) 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.
Reset the ECM (page 5-6).
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.
Turn the combination switch OFF and connect the
SCS service connector.
Turn the combination switch ON and check the
number of blinks of the MIL.
Does the MIL blink 21 times?
YES – GO TO STEP 2.
NO – Temporary failure (code does not
reappear).
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