4-38 FI SYSTEM DIAGNOSIS
“14” (P0120-H/L) TP SENSOR CIRCUIT MALFUNCTION
INSPECTION
Step 1 (When indicating 14:)
1) Turn the ignition switch to OFF.
2) Remove the front frame cover. (#8-8)
3) Check the TP sensor coupler
1 for loose or poor contacts.
If OK, then measure the TP sensor input voltage.
DETECTED CONDITION POSSIBLE CAUSE
14 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
O/Bl
B
VCC
TP
E2
Br
TP sensor
1
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