[2] Check component B2/5b1 (Intake air temperature sensor).: Value is below limit.

[2] Check component B2/5b1 (Intake air temperature sensor).: Value is below limit.

Test 1: Check component B2/5b1 (Intake air temperature sensor).

1. Check component B2/5b1 (Intake air temperature sensor).
Check actual value B2/5b1 (Intake air temperature sensor).
Test prerequisite

- Engine at idle
Status of relevant actual value:
- Intake air temperature:Warning! Communication with ECU required.
Specified value

- If the connection is unplugged at component B2/5 (Hot film mass air flow sensor), the value is approx. -40° C.
- The temperature should not be significantly higher than the ambient temperature.
- Temperature difference +/- [ 10° C ]
Question

- Is the actual value o.k.?


YES
The actual value is okay.Test wiring and plug connections between control module N3/9 (CDI control unit) and B2/5b1 (Intake air temperature sensor) for Loose contact, repair or replace if necessary.End of test

NO
Voltage supply of component B2/5b1 (Intake air temperature sensor)
Test prerequisite

- The actual value is not o.k.
Figure legend

- B2/5 (Hot film mass air flow sensor)
- B2/5b1 (Intake air temperature sensor)
- B2/5x1Plug connection B2/5 (Hot film mass air flow sensor)
Test sequence

- Switch off ignition.
- Detach coupling at component B2/5 (Hot film mass air flow sensor).
- Measure direct voltage with multimeter between sockets [B2/5x1] 3 and [B2/5x1] 4
- Switch on ignition.
Specified value

- Voltage[4,6...5,1] V

- Switch off ignition.
- Measure direct voltage with multimeter between sockets [B2/5x1] 3 and [B2/5x1] 2
- Switch on ignition.
Specified value

- Voltage[11...14] V
Question

- Is the measurement value OK?







YES
Test signal cable to component B2/5b1 (Intake air temperature sensor).
Test prerequisite

- The actual value is not o.k.
Figure legend

- B2/5 (Hot film mass air flow sensor)
- B2/5b1 (Intake air temperature sensor)
- B2/5x1Plug connection B2/5 (Hot film mass air flow sensor)
Test sequence

- Switch off ignition.
- Unplug connector of control module and component.
- Measure resistance with multimeter between socket [1.64] 64 of the 126-pole socket box tester and socket [B2/5x1] 4
Specified value:

- Resistance <1 Ohm?
Question

- Is the measurement value OK?







YES
The measurement value is OK.Test signal line between components N3/9 (CDI control unit) and B2/5b1 (Intake air temperature sensor) for Loose contact.End of test

NO
The measurement value is not OK.Possible cause and remedyTest signal line between components N3/9 (CDI control unit) and B2/5b1 (Intake air temperature sensor) for Open circuit.End of test

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

- Test lines between components N3/9 (CDI control unit) and B2/5b1 (Intake air temperature sensor) for Open circuit.


1. No further information available.