How to Fix 1999 Mercedes-Benz E430 P0100 Code?

What is OBD-II Trouble Code P0100 ?

Mass Air Flow(MAF) Circuit Malfunction

How to Fix 1999 Mercedes-Benz E430 P0100 Code?

Test  1 Check Actual Value B2/5 (Hot Film MAF Sensor)
Test  2 Test Voltage Supply of Component B2/5 (Hot Film MAF Sensor)

1 . Check Actual Value B2/5 (Hot Film MAF Sensor)

Test requirement

  • Temperature of coolant > 70 °C
  • Engine at idle speed
  • AC off

Status of the relevant actual values:

  • Temperature of coolant: Note! Communication with ECU required
  • Air mass: Note! Communication with ECU required
  • HFM-SFI voltage: Note! Communication with ECU required

Specified values

  • Air mass: kg/h (If engine speed rises, the air mass increases.)
  • HFM-SFI voltage: [1.3…1.7] V (If engine speed rises, the voltage increases.)

Question

  • Are the actual values o.k.?

Yes
The actual values are okay. ** End of Test **
No
The measured values are not o.k.
Possible cause and remedy

  • Test voltage supply of component B2/5 (Hot film MAF sensor).
  • Inspect cables from component N3/10 (ME-SFI control module) to component B2/5 (Hot film MAF sensor).
  • Unmetered air
  • B2/5 (Hot film MAF sensor)

** End **

2 . Test Voltage Supply of Component B2/5 (Hot Film MAF Sensor).

How to Fix 1999 Mercedes-Benz E430 P0100 Code

Test requirement

  • The actual value is not o.k.

Test sequence

  • Switch off ignition.
  • Detach the socket at the component B2/5 (Hot film MAF sensor).
  • (B2/5) 3 <–> 2 (B2/5)
  • Switch on ignition.

Specified value

  • Voltage[11.0…14.5] V

Question

  • Is the measured value okay? Yes

The measured value is o.k.
Further possible causes of fault

  • Unmetered air
  • Signal wire
  • B2/5 (Hot film MAF sensor)

No
The measured value is not o.k.
Possible cause and remedy

  • K40/7f29 (Fuse 29)
  • Cable for voltage supply

** End **

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