P0121

DTC P0121 - THROTTLE/PEDAL POSITION SENSOR/SWITCH "A" CIRCUIT RANGE/PERFORMANCE

OUTLINE OF DIAGNOSIS
Detect the malfunction of throttle position sensor output property. Judge NG when the throttle opening is largely different from the estimated value of throttle opening.




COMPONENT DESCRIPTION




ENABLE CONDITION

GENERAL DRIVING CYCLE
Perform the diagnosis continuously after idling.

DIAGNOSTIC METHOD




- Abnormality Judgment
Judge NG when one of the malfunctions is completed such as Low malfunction (1), Low malfunction (2) and High malfunction.




- Normality Judgment
Judge OK and clear the NG when all of the malfunctions are not completed such as Low malfunction (1), Low malfunction (2) and High malfunction.

DTC CLEAR CONDITION
- When the OK idling cycle was completed 40 times in a row
- When "Clear Memory" was performed

MALFUNCTION INDICATOR LIGHT CLEAR CONDITION
- When the OK driving cycle was completed 3 times in a row
- When "Clear Memory" was performed

FAIL SAFE
Throttle position sensor process:
- Fix the throttle opening at 6.4 °.
- Fix the closed throttle position learning value at 0 °.
- ISC open loop compensation: Fix the amount of ISC open loop compensation at 6.82%.
- ISC feedback compensation: Not allowed to calculate the amount of ISC feedback compensation.

ECM OPERATING AT DTC SETTING
Memorize the freeze frame data. (For test mode $02)