DTC P0502: Vehicle Speed Sensor Circuit Low Input
- OUTLINE OF DIAGNOSIS
- Detect the open or short circuit of vehicle speed.
- Judge NG when the vehicle speed is low while the vehicle speed is assumed to be high.
- ENABLE CONDITION ENABLE CONDITION
Secondary Parameters Enable Conditions None - GENERAL DRIVE CYCLE
Always perform the diagnosis continuously.
- DIAGNOSTIC METHOD
Judge NG when the time of completing the malfunction criteria below becomes more than time needed for diagnosis. Judge OK when the vehicle speed is more than 4 km/h (2.5 MPH) and less than 224 km/h (140 MPH).
Judgment Value
JUDGMENT VALUEMalfunction Criteria Threshold Value Low side diagnosis (1) Cumulative time when the malfunction criteria below are completed "GREATER THAN EQUAL TO" 0 seconds Idle switch OFF Injector pulse "GREATER THAN EQUAL TO" 2.5 milliseconds Engine speed "GREATER THAN EQUAL TO" 2,800 rpm Neutral switch OFF Vehicle speed signal (353 mS) <1 Time Needed for Diagnosis:
Low side: 20 seconds
Malfunction Indicator Light Illumination: Illuminates as soon as malfunction occurs.
- DTC CLEAR CONDITION
- When the OK idling cycle is 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
None
- ECM OPERATION AT DTC
Memorize the freeze frame data. (For test mode $02)