CASE STUDY: BMW 1 SERIES ENGINE ECM FAULT – ENGINE MISFIRE

Injectronics takes a look at a fault impacting BMW 116 and 118 model owners

Injectronics explains that owners of the BMW 116 and 118 models built between 2011 and 2015 have reported they are having issues with the vehicle lacking power, having a rough idle and that the engine light is illuminated on the instrument cluster.
It says the Engine Control Module (ECM) in these models commonly fail and when the ECM fails it will cause the engine to lose power and misfire on one or more cylinders.

Affected vehicles:
• BMW 116i 2011 – 2015
• BMW 118i 2011 – 2015

Common faults:
• Engine constantly misfiring 
• Loss of power

Fault codes:
• P0300/140001 – Combustion misfires, multiple cylinders: Fuel injection is cut
• 140010 – Combustion misfire multiple cylinders: Detected
• P0301/140101 – Combustion Misfire cylinder 1: Fuel injection is cut
• 140110 – Combustion misfire, cylinder 1: Detected
• P0302/140201 – Combustion Misfire cylinder 2: Fuel injection is cut
• 140210 – Combustion misfire, cylinder 2: Detected
• P1301/150102 – Ignition, cylinder 1: Combustion period too short
• P1303/150202 – Ignition, cylinder 2: Combustion period too short

Diagnosis:
Injectronics says the cause of the failure is commonly due to the ignition coil/s failing. When a coil/s fails it overloads the ignition coil driver and circuits within the ECM. It warns a common mistake made by technicians is to replace the ignition coil without checking ECM for damage.
Injectronics explains the technician can confirm a damaged ECM by testing with an oscilloscope. If there is no primary output signal from the ECM to terminal pin one on the ignition coil, it can be confirmed that the ECM is damaged. The faulty ECM should be repaired or replaced before fitting new coils to the vehicle.

Solution:
Injectronics explains it can test and repair these ECMs, avoiding the need to reprogram a brand-new replacement unit offering substantial time and money savings. When refitting the rebuilt ECM Injectronics recommends replacing the coils to prevent re-damaging the ECM.
Injectronics states it can provide the following solutions:
• a repair of the customer’s own unit
• supply new Ignition coils with the rebuilt unit
• supply a fully programmed exchange unit (customer must provide the original unit)
Injectronics requires the Front Electronic Module (FEM), ECM, Key reader, Key and Start/Stop button for testing and repair of the above listed faults. (Injectronics require only the ECM if it is testing/repairing an ignition fault on one of the cylinders and the customer has diagnosed the fault to be with the ECM).

For relevant part numbers and more information, please contact Injectronics on 03 8792 6999 or visit www.injectronics.com.au