P0103

Mass air flow sensor 1 has a short circuit to positive.


Possible cause:

- B6/5 (Right intake camshaft Hall sensor)
Affected functions:

- Engine diagnosis

-------------------------------------------------

Test 1: Check component B6/5 (Right intake camshaft Hall sensor).

1. Check component B6/5 (Right intake camshaft Hall sensor).

Test 1.1: Check assignment of signals from Hall sensors 'Camshafts' and 'Crankshaft'.

Test 1.2: Check component B6/5 (Right intake camshaft Hall sensor) using actual value.

Test 1.3: Check power supply of component B6/5 (Right intake camshaft Hall sensor).

1.1. Check assignment of signals from Hall sensors 'Camshafts' and 'Crankshaft'.
Check assignment of signals from Hall sensors 'Camshafts' and 'Crankshaft'.
Figure legend

- A -ConnectionTest cable 35-pin socket box
- 001 -Sockets of component N3/10 (ME-SFI [ME] control unit)
- 05 -35-pin socket box
- 050 -126-pin socket box
- 108 -Test cable 266 589 01 63 00
- N3/10 (ME-SFI [ME] control unit)
- II 1-63ConnectionTest cable
- III 64-126ConnectionTest cable
Warning!

- Connection A of test cable 108 may NOT be connected to connection B of the 126-pin socket box (050).
Continue to test with button F2







Figure legend

- 1Signal from component B6/5 (Right intake camshaft Hall sensor)
- 2Signal from component B6/7 (Right exhaust camshaft Hall sensor)
- 3Signal from component B6/4 (Left intake camshaft Hall sensor)
- 4Signal from component B6/6 (Left exhaust camshaft Hall sensor)
- 5Signal from component B70 (Crankshaft Hall sensor)
Test prerequisite

- Voltage supply is o.k.
Test sequence

- Switch off ignition.
- Connect socket box (126-pin) to component N3/10 (ME-SFI [ME] control unit).
- ConnectionMeasuring system
- Component B6/5 (Right intake camshaft Hall sensor):(A7) Observe oscilloscope pattern between sockets [M19] 19 and [M.55] 55 of the 126-pole socket box tester. (A.1)
- Component B6/7 (Right exhaust camshaft Hall sensor):(A7) Observe oscilloscope pattern between sockets [M19] 19 and [M.81] 81 of the 126-pole socket box tester. (A.2)
- Component B6/4 (Left intake camshaft Hall sensor):(A7) Observe oscilloscope pattern between sockets [M19] 19 and [M.56] 56 of the 126-pole socket box tester. (A.3)
- Component B6/6 (Left exhaust camshaft Hall sensor):(A7) Observe oscilloscope pattern between sockets [M19] 19 and [M.57] 57 of the 126-pole socket box tester. (A.4)
- Component B70 (Crankshaft Hall sensor):(A7) Observe oscilloscope pattern between sockets [M79] 79 and [M.80] 80 of the 126-pole socket box tester. (A5)
- Start engine.
Specified value

- Measuring system
Note

- Measuring system:Communication with ECU required













1.2. Check component B6/5 (Right intake camshaft Hall sensor) using actual value.
Warning!Communication with ECU required.


1.3. Check power supply of component B6/5 (Right intake camshaft Hall sensor).
Test prerequisite

- The actual value is not o.k.
Test sequence

- Switch off ignition.
- Detach coupling at component B6/5 (Right intake camshaft Hall sensor).
- [ B6/5 ]Measure direct voltage with multimeter between sockets 1 and 3[ B6/5 ]
- Switch on ignition.
Specified value

- Voltage[11.0...15.0] V
Question

- Is the measurement value OK?







YES
The measurement value is OK.Further possible causes of fault

- Signal wire
- B6/5 (Right intake camshaft Hall sensor)
End of test

NO
The measurement value is not OK.Possible cause and remedy

- N10/1f21 (Fuse 21)
- N10/1kC (Circuit 87 relay, engine)
- Lines to component B6/5 (Right intake camshaft Hall sensor)
End of test