[1] Check component B17/8 (Charge air temperature sensor).: Open circuit in wiring / Short circuit to positive

[1] Check component B17/8 (Charge air temperature sensor).: Open circuit in wiring / Short circuit to positive

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).
Note

- The fault code is stored even if the lines to component B17/8 (Charge air temperature sensor) are interrupted.
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. -40° 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) 1 and (B17/8x1) 2
- Switch on ignition.
Specified value

- Voltage[4.6...5.1] 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) 1 and (B17/8) 2
Specified value

- Resistor[20° C]: [5576...6163]ohms
- Resistor[30° C]: [3563...3938]ohms
- Resistor[50° C]: [1590...1758]ohms
- Resistor[60° C]: [1106...1222]ohms
- Resistor[80° C]: [569...629]ohms
- Resistor[90° C]: [419...463]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