AURETR044 Diagnose and repair integrated engine and transmission management systems Diagnose and repair a fault in the integrated engine and transmission management systems of two different vehicles or machinery, in which the work must involve removing, refitting or replacing a system component that affects the operation of both the engine and the transmission management system. BMW F23 230i recovered in with drivetrain/transmission issues. Confirmed dashboard displaying drivetrain and abnormal noise from gearbox when engaging drive or reverse. Connect vehicle to BMW diagnosis system. Found faults stored for DME (engine management) to EGS (transmission management) CAN communication. Lifted vehicle on ramp and inspected transmission, no visible damage or leaks found. Checked PT-CAN communication with scope. Found CAN Low signal intermittently dropping to 0 volts. Disconnected modules on PT-CAN one by one. When EGS is disconnected, CAN Low does not drop out, pointing towards EGS fault or wiring to EGS. Wired in fly leads from CAN bus divider point in engine bay to EGS module. Rechecked CAN comms, found it doesn’t drop out now, and no warning signs on dashboard when starting engine. Fault in wiring harness from EGS to engine bay. Removed harness and removed conduit to check wiring. Found slight damage to CAN Low wire. Replaced harness with a new one, as vehicle is still within manufacturer warranty. Sent old harness off to Technical Department for investigation. Faults all cleared with new harness and vehicle drives as it should again.

BMW E60 520D recovered in with transmission and drivetrain warning on dashboard and not shifting correctly. Connect vehicle to BMW diagnosis system, found multiple fault codes stored for transmission mechatronic. Raised vehicle on ramp and carried out visual inspection. Found oil leak from rear of transmission. Found to be coming from electrical connector on back of transmission. Removed exhaust to be able to disconnect plug. Found all electrical pins inside plug covered in oil. Sealing sleeve around plug leaking, causing plug to fill with oil. This would cause the mechatronic faults. Drained transmission oil and removed sump as described in AURTTX003. Unclipped sleeve from inside gearbox and removed it. Found seals on plug hardened, causing leak. Cleaned all surfaces and plug connector thoroughly. Fit new sleeve into place, and refit sump. Connect plug back up, and refill transmission as described in AURTTX003. Cleared fault codes and found them not coming instantly as before. Carried out road test, vehicle driving and shifting correctly now. Recheck for leaks, all ok.