5-34 FI SYSTEM DIAGNOSIS
“C13” (P1750-H/L) or “C17” (P0105-H/L) IAP SENSOR CIRCUIT
MALFUNCTION
INSPECTION
Step 1
(When indicating C13 for IAP sensor #2)
(When indicating C17 for IAP sensor #1)
1) Remove the fuel tank. (
#
6-3)
2) Turn the ignition switch OFF.
3) Check the IAP sensor coupler (#2
1
or #1
2
) for loose or
poor contacts.
If OK, then measure the IAP sensor input voltage.
DETECTED CONDITION
POSSIBLE CAUSE
C13/C17
IAP sensor voltage is not within the fol-
lowing range.
0.5 V
Sensor voltage < 4.85 V
NOTE:
Note that atmospheric pressure varies
depending on weather conditions as
well as altitude.
Take that into consideration when
inspecting voltage.
• Clogged vacuum passage between throttle body
and IAP sensor.
• Air being drawn from vacuum passage between
throttle body and IAP sensor.
• IAP sensor circuit open or shorted to ground.
• IAP sensor malfunction.
• ECM malfunction.
P1750/
P0105
P1750/
P0105
H
Sensor voltage is higher than specified
value.
• IAP sensor circuit shorted to VCC or ground cir-
cuit open.
• IAP sensor circuit open or shorted to ground or
VCC circuit open.
L
Sensor voltage is lower than specified
value.
ECM
R
B/Br
P/B
E2
IAP. F
VCC
IAP sensor #2 (Front cylinder)
IAP sensor #1 (Rear cylinder)
B/Br
G/B
R
IAP. R
1
Содержание VZR1800 2007
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