E1897

Timeout of the PremAir temperature signal


Possible cause:

- B11/15 (PremAir sensor)
Affected functions:

- Power generation

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Test 1: Check component B11/15 (PremAir sensor).

1. Check component B11/15 (PremAir sensor).

Test 1.1: Check power supply of component B11/15 (PremAir sensor).

Test 1.2: Test signal cable to component B11/15 (PremAir sensor).

Test 1.3: NoteThe PremAir sensor must be firmly latched and bonded to the PremAir radiator.

1.1. Check power supply of component B11/15 (PremAir sensor).
Check power supply of component B11/15 (PremAir sensor).
Test prerequisite

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

- Switch off ignition.
- Detach coupling at component B11/15 (PremAir sensor).
- Measure direct voltage with multimeter between sockets [ B11/15 ] 1 and [ B11/15 ] 3
- Switch on ignition.
Specified values

- Voltage[ 11.0...14.5] V
Question

- Is the measurement value OK?







YES
The measurement value is OK.Possible cause and remedy

- Signal wire
- B11/15 (PremAir sensor)
End of test

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

- N10/1f57 (Fuse 57)
- N10/1kI (Circuit 87 relay, engine)
- Lines to component B11/15 (PremAir sensor)
End of test

1.2. Test signal cable to component B11/15 (PremAir sensor).
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







Test signal cable to component B11/15 (PremAir sensor).
Test sequence

- Switch off ignition.
- Detach coupling at component B11/15 (PremAir sensor).
- Connect socket box (126-pin) to component N3/10 (ME-SFI [ME] control unit).
- Measure resistance with multimeter between socket [F.28] 124 of the 126-pole socket box tester and socket [B11/15] 2
Specified value

- Resistor[< 1 ]ohms
Question

- Is the measurement value OK?







YES
The measurement value is OK.End of test

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

- Line from control unit N3/10 (ME-SFI [ME] control unit) to component B11/15 (PremAir sensor)
End of test

1.3. NoteThe PremAir sensor must be firmly latched and bonded to the PremAir radiator.

1.3. No further information available.