P1373 Diagnosis Information - DME (DFI)

P1373

Diagnosis Information - DME (DFI)

Valve lift control - one bank in wrong lift

NOTE:
- Diagnosis detects that the valves of one bank are stuck in the small or large lift by way of the lambda controller controller.
- Diagnosis is not able to detect which bank is faulty while the vehicle is moving.
- It is possible to read out which bank is faulty after a short test.

Diagnostic conditions
- Perform a short test
- if a fault occurs during the short test
- after the short test E Read out 2 actual values:
- Status, valve lift bank 1 after short test
- Status, valve lift bank 2 after short test

The faulty bank is indicated (Fault)

or, if a short test is not possible:
- Engine oil temperature -11 °C ... 111 °C (12 °F ... 232 °F)
- Small lift:
- Engine speed between 1,000 rpm and 2,000 rpm
- Mass air flow between 150 mg/stk and 400 mg/stk
- Large lift:
- Engine speed between 2,000 rpm and 4,000 rpm
- Mass air flow > 550 mg/stk ... 325 mg/stk

Possible fault causes
- Loose contact or corrosion on connectors or lines
- Solenoid hydraulic valve for valve lift control of faulty bank is faulty
- Insufficient oil supply for faulty bank
- Greatly differing exhaust backpressure values between the banks
(e.g. due to constricted or blocked opening of an exhaust branch)
- Incorrectly adjusted timing of the intake or outlet camshaft of a bank
- An oxygen sensor is aged or faulty