P1559

P155900

Diagnostic information - DME control unit

Throttle valve adjuster

The control unit must be active in order to test internal function sequences and diagnosable inputs/outputs.
In the event of a fault, check whether the fault is permanently >present<. To perform the check, erase the fault memory, meet the diagnostic conditions and read out the fault memory again.

NOTE:
- Control of exhaust recirculation rate no longer possible.
- Check valve for unhindered movement and clean if necessary.

Diagnostic conditions
- Idling

Possible fault causes
- Sensor signal for throttle valve angle, limit value exceeded
- Throttle valve angle sensor signal, below limit value
- Open circuit
- Signal implausible
- Malfunction
- Servo motor activation, limit value exceeded
- Servo motor activation, below limit value

NOTE:
Diagnosis/Fault finding.
- Check throttle valve pressure signal
- Check wiring