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).
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 **