Upper Limit

Upper limit

Checking the fuel injection system
Check the intake system for air leakage.

Hint: Air leakage in the intake system can occur through the canister purge (CP) valve, the secondary air solenoid valve and power brake booster.

Start the engine. Allow the engine to run at idle speed for 10 minutes.
Check the mass air flow (MAF) sensor. Read off its correction factor. The value must be between 0.8 and 1.2.

Note! There must not be any air leakage when this test is carried out.

Hint: If the above fault-tracing does not remedy the fault, try replacing the heated oxygen sensor (HO2S), as the diagnostic trouble code (DTC) can also be stored by a damaged heated oxygen sensor (HO2S).

Remedy as necessary.

Other information
- Air leaks in the intake system, checking Air Leaks in the Intake System, Checking
- Mass air flow (MAF) sensor, B5254T7 Service and Repair
- Oxygen sensor (Catalyst monitor sensor), B5254T7 Oxygen Sensor (Catalyst Monitor Sensor)





Continue - Verification

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Verification




Verification
Read out and note the adaptation value.

Note! Do not erase diagnostic trouble codes (DTCs) as this also resets the adaptation values!

Test drive the car and perform a TRIP schedule.
Verifying repairs Verifying Repairs
Read off the fuel trim.
Check that the adaptation value is approaching 0 compared with the noted value. Check that the adaptation value is within the range 0 ±10 %.





Is the value OK?

Yes - Troubleshooting procedure complete

No - Fault-tracing information

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Fault-tracing information




Information

Fault-tracing information
The fault should have been detected and remedied. As this is not the case fault-tracing has failed.
Exit fault-tracing for this diagnostic trouble code (DTC) or make another attempt.

Do you want to exit fault-tracing?

Yes - Exit Fault-Tracing

No - Attempt New Test

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Attempt New Test - Checking the fuel injection system

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