ENGINE GENERAL INFORMATION AND DIAGNOSIS (H25 ENGINE) 6-1-67
DTC P0120 Throttle Position Circuit Malfunction (DTC No.21, 22)
WIRING DIAGRAM
DTC DETECTING CONDITION AND TROUBLE AREA
DTC CONFIRMATION PROCEDURE
1) With ignition switch OFF, connect scan tool.
2) Turn ON ignition switch and clear DTC by using scan tool if any.
3) Start engine and run it for 10 sec.
4) Check DTC by using scan tool.
[A] : Terminal arrangement of ECM (PCM) coupler viewed from harness side 1. Throttle position sensor
DTC DETECTING CONDITION TROUBLE AREA
TP sensor signal terminal voltage continues less than 0.1 V for 1 sec.
TP sensor signal terminal voltage continues more than 4.8 V for 1 sec.
TP sensor
TP sensor circuit
ECM (PCM)
NOTE:
Check to make sure that following conditions are satisfied when using this DTC CONFIRMATION PRO-
CEDURE.
• Intake air temperature : between –14°C and 70°C (6.8°F and 158°F)
• Atmospheric pressure : higher than 560 mmHg (Altitude : lower than 2790 m (9150 ft))
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