Engine Controls - Fault Code 09, Throttle Control (EML)
Group 12Engine Electrical
Bulletin Number
12 04 92 (3661)
Woodcliff Lake, NJ
November 1992
Product Engineering
SUBJECT:
Fault Code 09 Sets in Electronic Throttle Control Module (EML)
MODELS:
750iL (E32), 850i/iA (E31)
Situation:
Reports have been received of Fault Code 09 being set in the fault memory of the Electronic Throttle Control Module (EML) of the above mentioned vehicles.
In attempts to prevent the recurrence of these faults, previous recommendations were to replace both throttle motors and the Electronic Throttle Control Module.
In order to reduce the replacement of components due to Fault Code 09 being set, a procedure has been developed to determine the "type" of Fault Code 09 encountered, and EML Control Modules with modified hardware have been developed to address this issue.
General
Information:
Fault Code 09 can be set in several different situations. These situations are:
1) EML System Fault - hardware faults not plausible to the control module software.
2) Fault warning lamp or lead from warning lamp.
3) Power supply of warning lamp interrupted.
4) Power supply for control module falls below approximately 6 volts.
5) Fault Code 09 can be stored as a secondary fault in conjunction with other faults.
If Fault Code 09 is encountered during EML System Diagnosis, the following procedures must be followed exactly.
Note:
It is important that the BMW troubleshooter be familiar with diagnosis and characteristics of the Electronic Throttle Control System (EML). Refer to S.I. 12 06 88 (1669) and S.I. 12 11 89 (1982) for additional information on diagnosis and EML adaptation.
Procedures:
One of the two following procedures must be used, based on whether or not Fault Code 09 is set in conjunction with other faults.
Procedure 1: Fault Code 09 is set by itself with no other Fault Codes present. EML Test Code printout contains '99 78 . .."code.
1) Check the state of charge of the vehicle's battery (or batteries). If battery voltage is below 12.5 volts, the battery (or batteries) must be charged.
2) Check the EML warning lamp circuit to the EML Control Module. Battery voltage must be present on this circuit at all times (unless the EML Control Module has supplied a ground to it in order to illuminate the warning lamp). Interruption of this circuit will set Fault Code 09.
3) Check all power and ground supplies for the EML Control Module. Refer to the appropriate Electrical Troubleshooting Manual.
4) Verify that the Electronic Throttle
Control Module is compatible with the Engine Control Modules installed in the vehicle. Refer to S.I. 12 10 89 (1979).
5) If all of the above are in order, the EML Control Module should be replaced with one shown in the following chart (under the heading of "Fault Code 09 Only").
6) All replaced components must be returned to the WPRC with a copy of the Service Tester printout, including Control Module Identification page, Test Code printout page, and all Fault Memory pages.
Claims for components received without these printouts will be returned and debited to the dealer. The intent of this policy is not to reject warranty claims but to obtain all possible information pertaining to this repair.
A Quality Control Observation ("Pink Sheet") must be submitted for every EML Control Module replaced for a Fault Code 09 diagnosis.
Note:
Because these modified control modules (softwares C33, D33, E33 and F33) are presently only available in limited quantities, their use must be restricted to those cases addressed in Procedure 1; that is, only Fault code 09 is set, with test code beginning with "99 78," and no other faults present.
Procedure II: Fault Code 09 is set in conjunction with other Fault Codes.
1) Proceed with troubleshooting of other Fault Codes as directed by the diagnostics displayed on the Service Tester.
2) After repairs are completed, and all printouts are completed, clear the fault memory. Remember that the ignition switch must be turned off for at least 5 seconds (to allow the main relays to de-energize) and then back on after repairs before the fault memory can be cleared.
3) Test drive the vehicle and then read the fault memory again to verify that no faults have been set.
4) If Fault Code 09 is set again, and is not accompanied by other faults, perform Procedure 1.
Parts
Information:
Refer to the chart.
Note:
These EML Control Module part numbers are listed in order to select between the software versions only in the event that a control module has been definitely diagnosed as defective.
Warranty
Information:
Parts and labor are reimbursable under the applicable BMW New Car Limited Warranty. Use defect code(s), labor operation(s), and labor allowance(s) appropriate to the repair performed.
Note:
All control modules replaced under these procedures must be returned to the WPRC with complete printouts (control module identification, test code, fault memory, and troubleshooting pages) attached.
All control modules will be tested. Your cooperation will enable the Engineering Department to investigate these complaints and further refine the reliability of this system.