1A-39 Engine General Information and Diagnosis:
DTC “C14” (P0120-H/L): TP Sensor Circuit Malfunction
B817H21104012
Detected Condition and Possible Cause
Wiring Diagram
ECM coupler (Harness side)
Troubleshooting
CAUTION
!
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.
NOTE
• After repairing the trouble, clear the DTC using SDS tool. Refer to “Use of SDS Diagnosis Reset
Procedures (Page 1A-15)”.
• TP sensor is incorporated in the IAP sensor/IAT sensor.
Detected Condition Possible Cause
C14
Output voltage is not within the following
range.
Difference between actual throttle opening
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.
• TP sensor circuit is shorted to Vcc or ground circuit is
open.
• TP sensor circuit is open or shorted to the ground or Vcc
circuit is open.
P0120
H
Sensor voltage is higher than specified
value.
L
Sensor voltage is lower than specified
value.
B/Br
P/B
R
ECM
TP sensor
E2
29
TP
8
Vcc
11
I718H1110031-05
I718H1110240-01
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