15F300

The value of component B17/8 (Charge air temperature sensor) is implausible. Temperature change too fast


Possible cause:

- B17/8 (Charge air temperature sensor)
Affected functions:

- Power generation

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Test 1: Check component B17/8 (Charge air temperature sensor).

1. Check component B17/8 (Charge air temperature sensor).
Check actual value B17/8 (Charge air temperature sensor).
Test prerequisite

- Ignition ON
Status of relevant actual value:
- Boost air temperature:Warning! Communication with ECU required.
Specified value

- If the connection is unplugged at component B17/8 (Charge air temperature sensor), the value is approx. 100° C.
Question

- Is the actual value o.k.?


YES
The actual value is okay.Further procedure

- Test wiring and plug connections between control module N3/9 (CDI control unit) and B17/8 (Charge air temperature sensor) for Loose contact, repair or replace if necessary.
End of test

NO
Voltage supply of component B17/8 (Charge air temperature sensor)
Figure legend

- B17/8 (Charge air temperature sensor)
Special tool

- Adapter cable220 589 00 99 34
Test prerequisite

- Switch off ignition.
- Detach coupling at component B17/8 (Charge air temperature sensor).
- Connect adapter cable no. 220 589 00 99 34 to engine wiring harness B17/8 (Charge air temperature sensor).
- Measure direct voltage with multimeter between sockets (B17/8x1) 2 and (B17/8x1) 1
- Switch on ignition.
Specified value

- Voltage[3.1...3.5] V
Question

- Is the measurement value OK?







YES
Check internal resistance of component B17/8 (Charge air temperature sensor).
Figure legend

- B17/8 (Charge air temperature sensor)
Test prerequisite

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

- Switch off ignition.
- Connect adapter cable no. 220 589 00 99 34 at component B17/8 (Charge air temperature sensor).
- Measure resistance with multimeter between sockets (B17/8) 2 and (B17/8) 1
Specified value

- Resistor[10° C]: [9200...9500]ohms
- Resistor[20° C]: [5650...5950]ohms
- Resistor[30° C]: [3600...3900]ohms
- Resistor[50° C]: [1550...1750]ohms
- Resistor[70° C]: [750...950]ohms
- Resistor[90° C]: [400...500]ohms
Question

- Is the measurement value OK?







YES
The measurement value is OK.Further procedure

- Test signal line between components N3/9 (CDI control unit) and B17/8 (Charge air temperature sensor) for Open circuit.
End of test

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

- Replace component B17/8 (Charge air temperature sensor).
End of test

NO
The measurement value is not OK.Further procedure

- Test lines between components N3/9 (CDI control unit) and B17/8 (Charge air temperature sensor) for Open circuit.
End of test