Possible cause:
- Lambda control
Affected functions:
- Engine output
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Test 1: Check self-adaptation.
1. Check self-adaptation.
Test 1.1: Check lambda control.
1.1. Check lambda control.
Test 1.1.1: Check signal from component B2/5 (Hot film mass air flow sensor) via actual value.
Test 1.1.2: Check seal of component B2/5 (Hot film mass air flow sensor) with air filter for cracks.
Test 1.1.3: Inspect air cleaner housing.
Test 1.1.4: Check component G3/4 (Right O2 sensor, before TWC [KAT]).
Test 1.1.5: Check component Y62 (Fuel injectors).
Test 1.1.6: Check exhaust system for leaks.
1.1.1. Check signal from component B2/5 (Hot film mass air flow sensor) via actual value.
Test 1.1.1.1: Check signal of component B2/5 (Hot film mass air flow sensor) via actual value with engine OFF.
Test 1.1.1.2: Check signal of component B2/5 (Hot film mass air flow sensor) via actual value with engine speed greater than 3500 rpm.
Test 1.1.1.3: Check reference signal of component B2/5 (Hot film mass air flow sensor).
1.1.1.1. Check signal of component B2/5 (Hot film mass air flow sensor) via actual value with engine OFF.
Warning!Communication with ECU required.
1.1.1.2. Check signal of component B2/5 (Hot film mass air flow sensor) via actual value with engine speed greater than 3500 rpm.
Warning!Communication with ECU required.
1.1.1.3. Check reference signal of component B2/5 (Hot film mass air flow sensor).
Test sequence
- Switch on ignition.
Status of relevant actual value:
- HFM-SFI ( Reference signal ):Warning! Communication with ECU required.
Specified value
- Reference signal[46...59] ms
Question
- Is the measurement value OK?
YES
The actual value is okay.End of test
NO
The actual value is not o.k.Possible cause and remedy
- Check lines from component N3/10 (ME-SFI [ME] control unit) to component B2/5 (Hot film mass air flow sensor).
- B2/5 (Hot film mass air flow sensor)
