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Throttle
position
sensor
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6-50 ENGINE GENERAL INFORMATION AND DIAGNOSIS (TBI FOR G10)
DTC P0120 THROTTLE POSITION CIRCUIT MALFUNCTION
CIRCUIT DESCRIPTION
DTC DETECTING CONDITION POSSIBLE CAUSE
D Signal voltage high
or
D Signal voltage low
D “G” circuit open
D “Lg/W” circuit open or shorted to ground
D “Lg” circuit open or shorted to power or ground
D TP sensor malfunction
D ECM (PCM) malfunction
NOTE:
D When DTC P0105, P0110, P0115 and/or P0120 are indicated together, it is possible that “G” circuit is
open.
D When DTC P0105, P0120 and/or P0510 are indicated together it is possible that “Lg” circuit is open.
DTC CONFIRMATION PROCEDURE
1) Clear DTC, start engine and keep it at idle for 1 min.
2) Select “DTC” mode on scan tool and check DTC.
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