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Old 07-22-2007, 07:02 AM
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OBD Readiness Code Setting TSB

Vehicle: All Technical Service Bulletins Engine Controls/Emissions - OBD Readiness Code Setting
SI B 12 06 03 Engine Electrical
June 2003 Service Engineering

SUBJECT Setting OBD Readiness Code Prior to State Inspection

MODEL All from MY '96 with OBD II system

SITUATION A vehicle which is in the workshop for an emissions related warranty repair (Check Engine light is illuminated), is also due for the State Emissions Inspection to be performed immediately after the repair.
It is possible, that such a vehicle will not pass the state inspection (even with repairs successfully completed) due to OBD Readiness Codes having "Not Ready 0" status.

CAUSE Since the DME fault memory is being cleared during the emission related repair process, the OBD Readiness Codes are also cleared and set to "Not Ready - 0" status. Consequently, when the vehicle is tested afterwards at state emission inspection, certain OBD II monitoring tests may not be completed, especially if vehicle's driving is limited between the repair and inspection times.

CORRECTION Before emission-related repairs are attempted, OBD Readiness status should be determined.

After repairs, all monitors can be activated by driving the vehicle in a manner prescribed in the "OBD Drive Cycle"; certain monitors may also be activated by using DISPlus/GT1 test modules.
Upon successful completion of each monitor, the OBD Readiness Code will be set to "Ready Status 1".

PROCEDURE Before any repairs are performed, first determine the "as-received" status of "Readiness Codes" using procedure described in step # 1

If any of the individual tests shows status "0 - Not Ready", then determine the reason for this condition, and correct as necessary.

Then, investigate DME fault memory, perform repairs to emission related systems as needed, and erase DME fault memory.

Finally, follow the procedure described below in order to execute all of the readiness monitors and to set the Readiness Codes to "Ready Status-1".

In order to set the 0DB Readiness Codes to a "Ready status-1", DME has to conduct a series of functional tests during a strictly defined "driving cycle". Refer to "5T055 Engine Electronics" training manual (chapter "Emission Overview") for a detailed description of the OBD monitoring system.

1.To verify the status of Readiness Code using DISPlus/GT1 enter the following diagnostic path (e.g. vehicle with M54 MS43 engine management system):
^Select "Service Function"
^Select "Drive/Digital Motor Electronics"
^Select "Diagnostic Function"
^Select "Test Modules"
^Select Diagnostic function ORD II, then right arrow
^On the next screen, answer NO to a question: Do you wish to clear fault memory?. Then right arrow,
^Next screen will show the current status (completion rate) of individual tests monitored for OBD readiness code:
Oxygen sensor heating: (0 or 1)
Oxygen sensors: (0 or 1)
Secondary air: (0 or 1)
Fuel tank leakage diagnostic: (0 or 1)
Catalytic converter: (0 or 1)
0: Not concluded
1: Concluded

2.The functional tests for "Secondary air" and "Fuel tank leak diagnostic" can be completed by executing the appropriate DISPlus/GT1 system test modules.
To set criteria for the "Secondary air" follow DISPlus/GT1 test module plan (e.g. M54 MS43):
^Select "Service Function"
^Select "Complete vehicle"
^Select "Drive/Engine management"
^Select "Secondary air injection"
^Select "Secondary air pump"
^Select "Test modules", then follow screen instructions.

3.To set criteria for the "Fuel tank leak diagnostic" follow DISPlus/GT1 test module plan (e.g. M54 MS43):
^Select "Service Function"
^Select "Complete vehicle"
^Select "Drive/Engine management"
^Select "Tank system check"
^Select "Diagnostic module for tank leakage"
^Select "Test modules", then follow further instructions.

4.In order to complete "Oxygen sensor heating, "Oxygen sensor", and "Catalytic converter" system tests, vehicle has to be driven in a fashion similar to "OBD Drive Cycle":
^First drive constantly with road speed between 20 to 30 MPH for approximately 4 minutes
^Then, drive constantly with road speed between 40 to 60 MPH for approximately 15 minutes. (Some vehicle coasting time should be included)
^The diagnostic sequence will be interrupted if one of the following conditions occurs:
^engine speed exceeds 3000 RPM, or
^driving speed exceeds 60 MPH, or
^large fluctuations in acceleration are requested.

In such a case, stop the vehicle, turn engine off and start the driving cycle again.
^It is recommended to connect OTi for the duration of a driving test (with the "Diagnostic Function OBD II" test module selected) in order to monitor current completion status of system tests. This is particularly helpful in verilying that "drive cycle" criteria was achieved. In such a case monitor completion can be confirmed prior to finishing full drive cycle.
WARRANTY INFORMATION Covered under the terms of the BMW New Vehicle Limited Warranty.
Defect Code12 14 93 23 00Setting OBD Readiness Code prior to State Inspection
Labor Operation:00 54 676
Labor Allowance:5 FRU
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