Vehicle Speed - Not In Specified Range

P0501

Vehicle Speed - Not in Specified Range

Function
The system adaptation and the diagnosis for fuel tank ventilation is performed when the vehicle is stationary and the engine is idling. The diagnosis for misfire recognition is blocked at very high vehicle speed changes. To recognize the vehicle speed, the speed signal from the ABS control module is used.

Diagnosis conditions
A fault is recognized and stored when the engine speed is above 3000 rpm, the load signal is higher than 3.8 ms, the time since last reading is more than 10 sec. and no speed signal is detected.

P0501:

NOTE: The signal from the rear left wheel speed sensor is used.

Wiring Diagram







Diagnosis Procedure

Part 1







Part 2







1 Read ABS control module fault memory.

1. Connect and switch on Porsche System Tester 2.
2. Select vehicle type 911 Carrera (996).
3. Select system ABS 5.3 or ABS/TC 5.3.
4. Read fault memory.

2 Check wheel speed sensor with ohmmeter.

1. Remove connector X 2/4.
2. Connect ohmmeter on pin side to pins 1 and 2.
Display: 1.6 - 1.8 kohms

3 Check speed signal with Porsche System Tester 2.

1. Connect and switch on Porsche System Tester 2.
2. Select vehicle type 911 Carrera (996) and system ABS 5.3, menu Actual values, Rear left wheel speed sensor.
3. Raise vehicle at rear left.
4. By hand, turn rear left wheel in driving direction. The speed must be displayed on the tester.