FI SYSTEM DIAGNOSIS 4-45
“C14” (P0120-H/L) TP SENSOR CIRCUIT MALFUNCTION
INSPECTION
Step 1 (When indicating C14:)
1) Turn the ignition switch OFF.
2) Lift and support the fuel tank. (5-3)
3) Check the TP sensor coupler for loose or poor contacts.
If OK, then measure the TP sensor input voltage.
4) Disconnect the TP sensor coupler.
5) Turn the ignition switch ON.
6) Measure the voltage at the R wire and ground.
7) If OK, then measure the voltage at the R wire and B/Br
wire .
DETECTED CONDITION POSSIBLE CAUSE
C14 Output voltage is not within the following
range.
Difference between actual throttle open-
ing and opening calculated by ECM is
larger than specified value.
0.2 V Sensor voltage < 4.8 V
• TP sensor maladjusted
• TP sensor circuit open or short
• TP sensor malfunction
• ECM malfunction
P0120
H
Sensor voltage is higher than specified
value.
• TP sensor circuit shorted to VCC or ground circuit
open
• TP sensor circuit open or shorted to ground or
VCC circuit open
L
Sensor voltage is lower than specified
value.
ECM
R
B/Br
VCC
TP
E2
P/B
TP sensor
When using the multi-circuit tester, do not strongly touch the terminal of the ECM coupler with
a needle pointed tester probe to prevent the terminal damage or terminal bend.
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