4-82 FI SYSTEM DIAGNOSIS
“C46” (P1657-H/L or P1658) EXCV ACTUATOR CIRCUIT MALFUNCTION
INSPECTION
Step 1 (When indicating C46:)
1) Turn the ignition switch OFF.
2) Lift and support the fuel tank. (5-3)
3) Check the EXCVA lead wire coupler for loose or poor con-
tacts.
4) Turn the ignition switch ON.
5) Check the operation of the EXCVA.
(EXCVA operating order: Full close → Full open → 30% open)
Is the operation OK?
DETECTED CONDITION POSSIBLE CAUSE
C46 The operation signal does not reach the
EXCV actuator.
EXCVA position sensor voltage low or
high
0.1 V Sensor voltage < 4.9 V
(without the above range)
• EXCVA maladjusted
• EXCVA circuit open or short
• EXCVA motor malfunction
• EXCVA position sensor malfunction
P1657
H
Sensor voltage is higher than specified
value.
• EXCVA position sensor circuit shorted to VCC or
ground circuit open
L
Sensor voltage is lower than specified
value.
• EXCVA position sensor circuit open or shorted to
ground or VCC circuit open
P1658 The operation signal does not reach the
EXCVA motor.
ECM does not receive communication
signal from the STVA motor.
• EXCVA motor circuit open or short
• EXCVA motor malfunction
ECM
EXCVA
VCC
MPS
MO
MO
E2
B/R
R/BP
Gr
B/Br
W
YY
RB
1
YES Go to Step 2.
NO Go to Step 6.
1
SAMPLE
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