1051
Lambda control, before TWC left : Control implausible (P0173)
Test 1: Check self-adaptation.
Test 2: Possible cause:
- Lambda control
Affected functions:
- Engine output
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 G3/3 (Left 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
