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 (USED WITH ABNORMAL JUDGEMENT)
3. GENERAL DRIVING CYCLE
Perform the diagnosis continuously during fuel cut in deceleration.
4. DIAGNOSTIC METHOD
- Abnormality Judgment
Judge NG when the continuous time of completing the malfunction criteria below becomes more than 4 seconds.
- Normality Judgment
Judge OK and clear the NG when all malfunction criteria below are 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
- Vehicle speed sensor signal process: Vehicle speed = 10 km/h (6 MPH)
- ISC control: Set the open loop compensation to specified value (1 g (0.04 oz)/s). Not allowed ISC feedback volume calculation.
- Radiator fan control: ON both main/sub.
- Tumble generator valve control: Open the tumble generator valve.
8. ECM OPERATION AT DTC SETTING
Memorize the freeze frame data. (For test mode $02)