Engine Controls - MIL/EML Lamps ON/Multiple DTC's Set
SI B12 10 02Engine Electrical Systems
July 2007
Technical Service
This Service Information bulletin supersedes Advanced S.I. B12 10 02 dated August 2003.
SUBJECT
EDK Throttle Faults - Diagnostic Procedure
MODEL
E36/7: Z3 roadster 2.5/3.0; coupe 3.0 with M54
E46: 325i, 330i with M54 up to 06/2003
E39: 525i, 530i with M54 up to 06/2003
E53: X5 3.0 with M54 up to 06/2003
E85: Z4 with M54 up to 06/2003
E46: 325i with M56 up to 06/2003
SITUATION
The "Check Engine" and EML lights are illuminated; engine may go into fail-safe mode. Some of the following intermittent and "currently not present" EDK related fault codes may be stored in DME fault memory:
On M54 (MS43) equipped vehicles:
^ (112) 70 hex - Signal throttle sensor, potentiometer 1
^ (113) 71 hex - Signal throttle sensor, potentiometer 2
^ (115) 73 hex - Throttle range adaptation check
^ (118) 76 hex - Plausibility, signal pot 1
^ (119) 77 hex - Plausibility, signal pot 2
^ (135) 87 hex - Limp home adaptation, plausibility
^ (160) A0 hex - Throttle position controller, plausibility pot 1
^ (161) A1 hex - Throttle position controller, plausibility pot 2
On M56 (MS45.1), and M54 with MS45.0/MS45.1 equipped vehicles (Z4 and E46 from 03/03):
^ 28B3 - Throttle adaptation, lower mechanical stop not adapted
^ 2796 - EDK adaptation values incorrect
^ 2734 - Signal throttle sensor, potentiometer 1
^ 2735 - Signal throttle sensor, potentiometer 2
^ 27A5 - EDK new adaptation values required
CAUSE
The possible causes may include:
1. Internal failure (defective crimping) of the EDK throttle motor
2. Resistance fluctuation at X6390 EDK connector due to pin contamination
3. Signal interruption at X6390 EDK connector due to faulty crimping or defective female pins
CORRECTION
On a customer complaint basis only, follow the diagnostic and repair procedure described below.
PROCEDURE
1. Connect vehicle to DISPlus and read the fault memory
2. Remove air filter housing and rubber boot between air flow meter and EDK throttle. For removal instruction refer to RA 13 54 250 found in TIS. Do not remove throttle.
3. Check the EDK throttle production date printed on the black plastic housing of the throttle.If the manufacturing date is "01-05-02" (1st of May, 2002) or higher, the EDK has the latest level of improvements and should not be replaced. If the production date is prior to "01-05-02", the EDK throttle has to be replaced with the improved part
4. Replace the engine electrical harness regardless of EDK production date.
PARTS INFORMATION
WARRANTY INFORMATION
Covered under the terms of the BMW New Vehicle Limited Warranty.
Please refer to the latest KSD for all applicable labor operations and allowances.
If the appropriate labor operation is not contained in KSD, then a work time labor operation should be used.
Defect Code 12 51 06 37 00
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