Monday, April 13, 2020

2010-2020 BMW 128i Diagnostic and Repair Information

2A3E

2A3E – P1078

Information saved in

DME

Fault code

2A3E – P1078

Fault text

Valvetronic, actuator motor: overload

Fault description

VVT-Overload Protection Control Motor Current High

Input (Bank 1)

Condition for fault identification

Test condition:

Monitoring of servo motor overload;

The VVT servo motor temperature is calculated in the DME

using a model. The first stage occurs when it heats beyond a

warning threshold (fault #10819, fault class 2). This is 190

掳C (VVT motor temperature) and causes the VVT to revert

to operation in its emergency mode. If the VVT motor were

to overheat even further, the VVT system would be

completely deactivated upon reaching the deactivation

2010-2020 BMW 128i Convertible (E88) L6-3.0L (N51) WWW.168MOTIVE.COM Page 69

threshold (200 掳C VVT motor temperature).

Terminal condition: Terminal 15 ON

Voltage condition:

none

Condition for fault memory entry

Warning threshold: 190 掳C VVT Servo motor temperature

Deactivation threshold: 200 掳C VVT servo motor

temperature

Action in service

1. Check VVT servo motor

2. Allow servo motor to cool, Clear fault memory and verify

that DME software is the most recent version

3. DO NOT 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