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On Board Diagnosis Logic
NHEC0077
Malfunction is detected when
(Malfunction A) an excessively low or high voltage from the sen-
sor is sent to ECM,
(Malfunction B) a high voltage from the sensor is sent to ECM
under light load driving conditions,
(Malfunction C) a low voltage from the sensor is sent to ECM
under heavy load driving conditions.
FAIL-SAFE MODE
NHEC0077S02
When the malfunction Ais detected, the ECM enters fail-safe mode
and the MIL lights up.
Detected items Engine operating condition in fail-safe mode
Throttle position sensor
circuit
Throttle position will be determined based on the injected fuel amount and the engine speed.
Therefore, acceleration will be poor.
Condition Driving condition
When engine is idling Normal
When accelerating Poor acceleration
Possible Cause
NHEC0430
MALFUNCTION A
NHEC0430S01
I Harness or connectors
(The throttle position sensor circuit is open or shorted.)
I Throttle position sensor
MALFUNCTION B
NHEC0430S02
I Harness or connectors
(The throttle position sensor circuit is open or shorted.)
I Throttle position sensor
I Fuel injector
I Crankshaft position sensor (REF)
I Crankshaft position sensor (POS)
I Mass air flow sensor
MALFUNCTION C
NHEC0430S03
I Harness or connectors
(The throttle position sensor circuit is open or shorted.)
I Intake air leaks
I Throttle position sensor
DTC Confirmation Procedure
NHEC0078
NOTE:
I Perform “PROCEDURE FOR MALFUNCTION A” first. If the
1st trip DTC cannot be confirmed, perform “PROCEDURE
FOR MALFUNCTION B”.
If there is no problem on “PROCEDURE FOR MALFUNC-
TION B”, perform “PROCEDURE FOR MALFUNCTION C”.
I If “DTC Confirmation Procedure” has been previously
conducted, always turn ignition switch “OFF” and wait at least
10 seconds before conducting the next test.
GI
MA
EM
LC
FE
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0120 THROTTLE POSITION SENSOR
On Board Diagnosis Logic
EC-177
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