Engine Controls - SES Lamp ON/Code 2A90 Set/Runs Rough

SI B 12 12 06
Engine Electrical Systems

April 2007
Technical Service

This Service Information bulletin supersedes S.I. B12 12 06 September 2006.

[NEW] designates changes to this revision

SUBJECT
N62TU - Diagnosis for DME FC 2A90

MODEL
E65, E66 with N62TU from 03/05 [NEW] up to 06/06
E60, E63, E64 with N62TU from 09/05 [NEW] up to 06/06

SITUATION

"Service Engine Soon" light is illuminated and fault code 2A90 ("Exhaust camshaft, tooth offset to crankshaft currently present") is stored in the DME.

Also, several other faults codes (e.g. 2B64, 2A8B, 2A8F, 2A8A, 2A8E, 2A8D, 2A91) for the intake or exhaust Vanos units may be found in the DME memory.

In some cases, the customer may complain of engine rough running.

CAUSE

Implausible crankshaft or camshaft sensor signals.

1. Follow the DIS/GT1 test plan for FC 2A90.

2. Replace all four camshaft sensors (PN 13 62 7 558 518). For the intake/exhaust camshaft sensors replacement procedure refer to repair manuals RA12 14 512, RA12 14 513, RA12 14 522, and RA12 14 526.

3. Replace crankshaft sensor (PN 12 14 7 503 140). For the crankshaft sensor replacement procedure refer to repair manual RA12 14 521.

4. Clear camshaft/crankshaft sensors adaptation values using DIS/GT1 loaded with CD V47.0, or higher.

Select the following path:

^ Control Module Functions - DME Motor Electronics

^ RAM back up

^ Select "Activate".

NOTE:
After activation, there is no acknowledgement displayed on the screen.

^ Turn the ignition OFF for at least one minute, and then turn ON again.

^ Clear DME fault memory and test drive vehicle to verify effectiveness of the repair.

WARRANTY INFORMATION

For information only.





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