Possible cause:
- B2/5 (Hot film mass air flow sensor)
- M16/6 (Throttle valve actuator)
- Selfadaptation of mixture formation
Affected functions:
- Engine output
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Test 1: Check component B2/5 (Hot film mass air flow sensor).
Test 2: Check self-adaptation of mixture formation.
Test 3: Check component B2/5b1 (Intake air temperature sensor).
Test 4: Check component M16/6 (Throttle valve actuator).
1. Check component B2/5 (Hot film mass air flow sensor).
Test 1.1: Check signal of component B2/5 (Hot film mass air flow sensor) via actual value with engine OFF.
Test 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 1.3: Check reference signal of component B2/5 (Hot film mass air flow sensor).
Test 1.4: Check power supply of component B2/5 (Hot film mass air flow sensor).
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.
1.2. 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.
1.3. 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)
1.4. Check power supply of component B2/5 (Hot film mass air flow sensor).
Image legends
- B2/5 (Hot film mass air flow sensor)
