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4-38 FI SYSTEM DIAGNOSIS
“C13” (P0105-H/L) IAP SENSOR CIRCUIT MALFUNCTION
INSPECTION
Step 1 (When indicating C13:)
1) Turn the ignition switch OFF.
2) Lift and support the fuel tank. (5-3)
3) Check the IAP sensor coupler for loose or poor contacts.
If OK, then measure the IAP sensor input voltage.
DETECTED CONDITION POSSIBLE CAUSE
C13 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.
P0105
H
Sensor voltage is higher than specified
value.
• IAP sensor circuit open or shorted to VCC or
ground circuit open.
• IAP sensor circuit shorted to ground or VCC cir-
cuit open.
L
Sensor voltage is lower than specified
value.
ECM
B/Br
VCC
IAP
E2
IAP sensor
R
G/B
1