Mercedes Benz Truck G 550 (463.236) V8-5.5L (273.963) Diagnostic Trouble Codes 0537

Mercedes Benz Truck G 550 (463.236) V8-5.5L (273.963) Diagnostic Trouble Codes Mercedes-Benz Mercedes Benz OEM Parts Mercedes Benz OE Replacement Parts0537
B2/5 (Hot film mass air flow sensor)
Possible cause:
- B2/5 (Hot film mass air flow sensor)
Affected functions:
- Engine output
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Test 1: Check component B2/5 (Hot film mass air flow sensor).
1. Check component B2/5 (Hot film mass air flow sensor).
Test 1.1: Check reference signal of component B2/5 (Hot film mass air flow sensor).
Test 1.2: Check power supply of component B2/5 (Hot film mass air flow sensor).
Test 1.3: Check signal of component B2/5 (Hot film mass air flow sensor) via actual value with engine OFF.
Test 1.4: Check signal of component B2/5 (Hot film mass air flow sensor) via actual value with engine speed greater than 3500 rpm.
1.1. 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
Mercedes Benz Truck G 550 (463.236) V8-5.5L (273.963)  Diagnostic Trouble Codes  Page 521
- 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)
1.2. Check power supply of component B2/5 (Hot film mass air flow sensor).
Image legends
- B2/5 (Hot film mass air flow sensor)
- Connector (5-pin)
Test prerequisite
- The actual value is not o.k.
Test sequence
- Switch off ignition.
- Detach coupling at component B2/5 (Hot film mass air flow sensor).
- Measure direct voltage with multimeter between sockets (B2/5) 2 and (B2/5) 1
- Switch on ignition.
Specified value
- Voltage[11.0...15.0] V
Question
- Is the measurement value OK?
YES
The actual value is okay.Further possible causes of fault
- Unmetered air
- Signal wire
- B2/5 (Hot film mass air flow sensor)
End of test
Mercedes Benz Truck G 550 (463.236) V8-5.5L (273.963)  Diagnostic Trouble Codes  Page 522
NO
The measurement value is not OK.Possible cause and remedy
- N10/1f43 (Fuse 43)
- Cable for voltage supply
End of test
1.3. Check signal of component B2/5 (Hot film mass air flow sensor) via actual value with engine OFF.
Warning!Communication with ECU required.
1.4. 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.