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5 CHECK THROTTLE POSITION SENSOR POWER SUPPLY CIRCUIT
1. Disconnect throttle position sensor harness connector.
SEC001C
2. Turn ignition switch “ON”.
3. Check voltage between throttle position sensor terminal 3 and ground with CONSULT-II or tester.
SEF306X
OK or NG
OK © GO TO 6.
NG © Repair open circuit or short to ground or short to power in harness or connectors.
6 CHECK THROTTLE POSITION SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch “OFF”.
2. Check harness continuity between sensor terminal 1 and engine ground.
Refer to Wiring Diagram.
Continuity should exist.
3. Also check harness for short to power.
OK or NG
OK © GO TO 8.
NG © GO TO 7.
7 DETECT MALFUNCTIONING PART
Check the following.
I Harness for open or short between ECM and throttle position sensor
I Harness for open or short between TCM (Transmission Control Module) and throttle position sensor
© Repair open circuit or short to power in harness or connectors.
GI
MA
EM
LC
FE
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0120 THROTTLE POSITION SENSOR
Diagnostic Procedure (Cont’d)
EC-183
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