Wednesday, May 20, 2020

2010 BMW 128i Convertible (E88) L6-3.0L (N52K) Manufacturer Code Page 97

2010 BMW 128i Convertible (E88) L6-3.0L (N52K) Manufacturer Code Page 97

Fault description

VVT-Overload Protection Temperature Too High

Condition for fault identification

Test condition:

The temperature of the VVT driver circuit in the DME is

monitored, and the system responds to overheating by

reverting to VVT emergency mode operation – the vehicle

continues to operate, but in throttled mode. Incorrect use of

the pedal-position sensor, consisting of rapid, repeated

pressure extending over several minutes heats up the VVT

driver circuit in the DME, leading to its deactivation when it

reaches a critical level.

Terminal condition: Terminal 15 ON

Voltage condition:

none

Condition for fault memory entry

after Terminal 15 switch and/or always active if DME is

awake.

VVT driver circuit in the DME: Warning threshold 112 掳C

Action in service

If no tampering/abuse can be detected the following tests

should be carried out:

1. Check for correct reluctor attachment at VVT sensor.

2. Use tester to manually activate the E-box fan for acoustic

check.

3. DME installed according to specification and check to

verify installation of spacer plate (to guide airflow in EBox).

4. Check wiring harness between VVT motor and DME for

soft shorts between the two VVT motor wires and vehicle

ground

5. Defective VVT servo motor (for instance, interturn short

circuit)

– Replace servo motor and determine whether malfunction is

still present (Clear fault memory / switch terminals on

ignition)

6. If malfunction is still present, replace DME.

Fault effect and breakdown warning

Driver information

Warning light:

ECE: No warning message. Engine reverts to VVT

emergency backup mode (throttled operation) US: OPEN

Service instruction

none

2A44

2A44 – P1062

Information saved in

DME

Fault code

2A44 – P1062

Fault text

Valvetronic, power limitation

Fault description

VVT-Limp Home Request Full Stroke Position not Reached

(Bank 1)

Condition for fault identification