P0122

P0122
Throttle Position Sensor - Below Limit

P0123
Throttle Position Sensor - Above Limit

Function

The TP sensor determines the position of the throttle valve. The TP sensor is supplied with + 5 V through pin 53 of the DME control module and connected to ground through pin 34. The output signal voltage of the TP sensor ranges from approx. 0.5 V to approx. 4.7 V, depending on the position of the throttle.
The idle contact is generated from the voltage value which results during the deceleration phase.
The value for full load contact is calculated from the generated idle contact value.

Diagnosis conditions





A fault is detected and stored in the memory when the voltage drops below 0.15 V or exceeds 4.85 V and the engine speed is above 400 rpm.




Wiring diagram




Diagnosis procedure


1 Check voltage supply to TP sensor.

1. Connect special tool 9616.

2. Connect voltmeter to pin 53 (positive) and pin 34 (negative).

Switch on the ignition.

Display: approx. 4.5 - 5 volts

2 Check TP sensor.

1. Connect special tool 9616 to wiring harness (DME control module connector).

2. Connect ohmmeter to pin 44 and pin 53.

Display: approx. 2.0 - 3.0 kOhms

Fully depress accelerator pedal.

Display: approx. 0.7 - 1.4 kOhms

If there is no display, check the TP sensor directly.

3 Check wiring from TP sensor to DME control module for continuity or short circuit to B+ or ground.

1. Separate disconnection point to TP sensor.

2. Connect special tool 9616 to wiring harness (DME control module connector).

3. Connect ohmmeter to disconnection point, pin 1, and special tool 9616, pin 34.

Display: 0 - 5 ohms

4. Connect ohmmeter to disconnection point, pin 2, and special tool 9616, pin 53.

Display: 0 - 5 ohms

5. Connect ohmmeter to disconnection point, pin 3, and special tool 9616, pin 44.

Display: 0 - 5 ohms

6. Connect ohmmeter to disconnection point, pin 2, and ground.

Display: infinity ohms

7. Connect ohmmeter to disconnection point, pin 3, and ground.

Display: infinity ohms

8. Connect voltmeter to disconnection point, pin 2, and ground.

Switch on the ignition.

Display: 0 V

9. Connect voltmeter to disconnection point, pin 3, and ground.

Switch on the ignition.

Display: 0 V

If battery voltage is indicated for points 8 and 9, check wiring harness for chafing and pinching damage.