P0503
DTC P0503 VEHICLE SPEED SENSOR INTERMITTENT/ERRATIC/HIGH1. OUTLINE OF DIAGNOSIS
Detect the open or short circuit of vehicle speed sensor.
Judge NG when high vehicle speed (300 km/h (186.4 MPH) or more) 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 at less than 4,000 rpm in engine speed.
4. DIAGNOSTIC METHOD
^ Abnormality Judgment
Judge NG when the cumulative 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 (6.21 MPH)
^ Fuel cut control: Not allowed vehicle speed 0 km/h (0 MPH) fuel cut. Normally the high vehicle speed fuel cut performs on "and" of vehicle speed condition and engine speed, but perform the fuel cut only on engine speed condition (4,800 rpm or more).
^ ISC control: Set the open loop compensation to specified value (1 g/s). Not allowed ISC feedback volume calculation.
^ Air conditioner control: Not allowed air conditioner cut at accelerating.
^ Radiator fan control: Hi driven both main/sub.
^ Judge gear ratio: Control as gear fixed on 6th.
^ Tumble generator valve control: Open the tumble generator valve.
8. ECM OPERATION AT DTC SETTING
Memorize the freeze frame data. (For test mode $02)