DTC P0121: Throttle/Pedal Position Sensor/Switch "A" Circuit Range/Performance

Detect the malfunction of throttle position sensor output property.

Judge NG when the throttle position value is low in spite of the driving condition that accelerator pedal seems to be depressed, or when the throttle position value is high in spite of the driving condition that accelerator pedal seems to be released from engine appearance.

Perform the diagnosis continuously after starting engine.

• Abnormality Judgment 

  Judge NG when the continuous time of completing the malfunction criteria of Low side or High side below becomes more than time needed for diagnosis.

  Judgment Value 

  JUDGMENT VALUE (ABNORMALITY JUDGMENT)
  
  

  Malfunction Criteria	Threshold Value
  (Low side) Output voltage Engine speed Amount of intake air Intake manifold pressure	"LESS THAN EQUAL TO" 0.75 V "GREATER THAN EQUAL TO" 1,000 rpm "GREATER THAN EQUAL TO" 90 kg/h "GREATER THAN EQUAL TO" 80 kPa (600 mmHg, 24 inHg)
  (High side) Output voltage Engine speed Amount of intake air Intake manifold pressure	"GREATER THAN EQUAL TO" 1.6 V 600 - 1,500 rpm "LESS THAN EQUAL TO" 25 kg/h "LESS THAN EQUAL TO" 47 kPa (352 mmHg, 14 inHg)

  Time Needed for Diagnosis: 

  Low side: 3 seconds

  High side: 10 seconds

  Malfunction Indicator Light Illumination:  Illuminates when malfunction occurs in 2 continuous driving cycles.

• Normality Judgment 

  Judge OK and clear the NG when the malfunction criteria below are completed.

  Judgment Value 

  JUDGMENT VALUE (NORMALITY JUDGMENT)
  
  

  Malfunction Criteria	Threshold Value
  (Low side) Output voltage Engine speed Amount of intake air Intake manifold pressure	> 0.75 V "GREATER THAN EQUAL TO" 1,000 rpm "GREATER THAN EQUAL TO" 90 kg/h "GREATER THAN EQUAL TO" 80 kPa (600 mmHg, 24 inHg)
  (High side) Output voltage Engine speed Amount of intake air Intake manifold pressure	"LESS THAN EQUAL TO" 1.6 V 600 - 1,500 rpm "LESS THAN EQUAL TO" 25 kg/h "LESS THAN EQUAL TO" 47 kPa (352 mmHg, 14 inHg)

• When the OK idling cycle is completed 40 times in a row
• When "Clear Memory" was performed

• When the OK driving cycle was completed 3 times in a row
• When "Clear Memory" was performed

Fix the throttle position to 6.4°.

Memorize the freeze frame data. (For test mode $02)