P0502
DTC P0502 VEHICLE SPEED SENSOR CIRCUIT LOW INPUT1. OUTLINE OF DIAGNOSIS
Detect the open or short circuit of vehicle speed sensor.
Judge NG when low vehicle speed (0 km/h (0 MPH)) remains whereas it seemed to be in a usual driving speed.
2. ENABLE CONDITION
3. GENERAL DRIVING CYCLE
Perform the diagnosis continuously during fuel cut in deceleration.
4. DIAGNOSTIC METHOD
Judge NG when the continuous time of completing the malfunction criteria becomes more than 4 seconds. Judge OK and clear the NG when the malfunction criteria are not completed.
5. DTC CLEAR CONDITION
- When the OK idling cycle was completed 40 times in a row
- When "Clear Memory" was performed
6. MALFUNCTION INDICATOR LIGHT CLEAR CONDITION
- When the OK driving cycle was completed 3 times in a row
- When "Clear Memory" was performed
7. FAIL SAFE
- Throttle position sensor signal process: All closed points learning/Not allowed to increase.
- Vehicle speed sensor signal process: Vehicle speed = 0 km/h (0 MPH)
- Fuel cut control: Vehicle speed = 0 km/h (0 MPH) / Not allowed to carry out the fuel cut. High vehicle speed / Not allowed to carry out the fuel cut.
- ISC open loop compensation: Fix the open loop compensation at 5%
- ISC feedback control: Not allowed to calculate the amount of ISC feedback.
- Air conditioner control: Not allowed to resume the air conditioner that is cut with the throttle fully opened.
- Radiator fan control: Both main and sub fan are in High driving.
8. ECM OPERATION AT DTC SETTING
Memorize the freeze frame data. (For test mode $02)