4-56 FI SYSTEM DIAGNOSIS
“C22” (P1450-H/L) AP SENSOR CIRCUIT MALFUNCTION
INSPECTION
Step 1 (When indicating C22:)
1) Turn the ignition switch OFF.
2) Remove the front seat. (8-7)
3) Check the AP sensor coupler for loose or poor contacts.
If OK, then measure the AP sensor input voltage.
DETECTED CONDITION POSSIBLE CAUSE
C22 AP 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 air passage with dust
• AP sensor circuit open or shorted to ground
• AP sensor malfunction
• ECM malfunction
P1450
H
Sensor voltage is higher than specified
value.
• AP sensor circuit shorted to VCC or ground circuit
open
• AP sensor circuit open or shorted to ground or
VCC circuit open
L
Sensor voltage is lower than specified
value.
ECM
B/Br
E2
AP
R
AP sensor
G/Y
VCC
1
SAMPLE
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