Short Circuit to Ground or Open Circuit

B2/5 (Hot Film MAF Sensor) :: Short Circuit to Ground or Open Circuit (P0102)

Check component B2/5 (Hot Film MAF Sensor).

Test 1 Test Signal Voltage of Component B2/5 (Hot Film MAF Sensor) By Means Of Actual Value.
Test 2 Test Voltage Supply of Component B2/5 (Hot Film MAF Sensor).


1 Test Signal Voltage of Component B2/5 (Hot Film MAF Sensor) By Means Of Actual Value.

Test requirement
- Battery voltage is o.k..
- The 5 voltage supply of component B2/5 (Hot film MAF sensor) is OK.
- The 12 voltage supply of component B2/5 (Hot film MAF sensor) is OK.
- Engine not running
- Ignition ON

Status of relevant actual value:
- HFM-SFI voltage: Note! Communication with ECU required

Specified value:
- Voltage [0,980...1,030] V

Question
- Are the measured values okay?
Yes
The actual values are okay.
Possible cause and remedy
- Check assignment of component B2/5 (Hot film MAF sensor) to engine model designation.
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).
- B2/5 (Hot film MAF sensor)

** End of Test **


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


Testr 2-1 Test Voltage Supply 5V of Component B2/5 (Hot Film MAF Sensor).
Test 2-2 Test Voltage Supply 12V of Component B2/5 (Hot Film MAF Sensor).


2-1 Test Voltage Supply 5V 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 <--> 4 (B2/5)
- Switch on ignition.

Specified value
- Voltage[4.75...5.25] V

Question
- Is the measured value okay?
Yes
The measured value is o.k. ** End of test **
No
The measured value is not o.k. Possible cause and remedy : Test voltage supply of component B2/5 (Hot film MAF sensor). Test voltage supply of the following components for short circuit:
- B28 (Intake manifold pressure sensor)
- B37 (Accelerator pedal sensor)
- B40 (Oil sensor (oil level, temperature and quality))
- M16/6 (throttle valve actuator)
- B4/3 (Fuel tank pressure sensor)(only )

** End of Test **


2-2 Test Voltage Supply 12V 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
- Cable for voltage supply

** End of Test **