Ignition System - MIL ON/DTC's P0301-P0312 Stored in ECM
01 MIL on (P0300 and/or P0301 - P0312 for misfire stored in ECM)
01 10 13
2022624/3
September 1, 2010
Supersedes Technical DIAGNOSIS AND REPAIR Group 01 number 10-09 dated June 1, 2010 for reasons listed below.
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AFFECTED VEHICLES
CONDITION
^ MIL on.
^ Rough idle.
^ One or more of the following DTCs are stored:
^ DTC P0300 (Random/Multiple Cylinder Misfire Detected).
^ DTC P0301 - P0312 (Cyl. 1 Misfire Detected - Cyl. 12 Misfire Detected).
^ Engine may have reduced performance without significant loss of power or stalling.
TECHNICAL BACKGROUND
Misfire faults causing MIL illumination can occur for a number of different reasons not directly related to ignition coil operation. Proper GFF
misfire diagnosis must be followed before replacing any ignition coils.
PRODUCTION SOLUTION
Improved ignition coil since 2008 model year.
SERVICE
Obtain information from the customer
To repair the vehicle correctly, please try to obtain as much information as possible from the customer about the symptoms of the condition and
when it occurred.
^ In what situation (turning, etc.) does the condition occur?
^ Under what environmental conditions (road conditions, weather, temperature, start conditions, etc.) does the condition occur?
^ What is the operating situation of the vehicle (activated electrical equipment, gear selection, etc.) when the condition occurs?
^ Can the complaint be reproduced?
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Workshop procedure
1. Read out the data memory of all engine control units, and note the environmental conditions on the DTC log.
a. If there are other entries in addition to combustion misfires, address the other entries before addressing the cylinder misfires.
b. If DTC P0301 - P0312 (Cyl. 1 Misfire Detected - Cyl. 12 Misfire Detected) is accompanied by P1250 (Fuel level too low), it is likely the faults
occurred due to a low fuel level and not a malfunction of the coils.
c. Review all applicable TSBs related to cylinder misfires and ECM software improvements before diagnosing the misfire condition. For example,
if data shows that a DTC was set during cold start, search ElsaWeb for TSBs related to cold start misfires.
2. Try to duplicate customer complaint based on the environmental conditions at the time the DTC was set. The freeze data gives important
indicators for the traceability of the complaint, in particular if it occurs sporadically or at cold start.
3. Review the vehicle repair history for previous misfire or maintenance service that could be related to the current complaint.
4. Observe the requirements of Guided Fault Finding. Perform Guided Fault Finding in full according to the proposed sequence (test plan). Do not
skip any steps.
5. Complete Guided Fault Finding correctly and set the readiness code.
Tip: This is important to ensure that no subsequent faults occur due to the misfire.
6. In the case of single cylinder misfires:
a. Before replacing components, determine whether the complaint migrates to the other cylinders after exchanging the coils. If necessary, perform
a test drive to ascertain this.
b. If the misfire migrates to the cylinder the coil was moved to, replace only the affected coil.
7. Verify repair under the same environmental conditions (e.g.: engine speed, engine load value, vehicle speed, coolant temperature, intake air
temperature, ambient air pressure, voltage at terminal 30, etc.) as noted on the DTC log.
WARRANTY
This TSB is informational only and not applicable to any Audi warranty.
ADDITIONAL INFORMATION
All parts and service references provided in this TSB are subject to change and/or removal. Always check with your Parts Department and service
manuals for the latest information.
