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Testing coolant temperature sender -G62 > < Testing air mass meter -G70

A4 Mk1

Motronic injection and ignition system (4-cyl.)
Servicing Motronic injection system
Testing intake air temperature sender -G42

Fitting location of sender and connector
.

  • ‒ Connect vehicle diagnostic, testing and information system VAS 5051 (or fault reader V.A.G 1551) and select engine electronics control unit by entering address word "01" ( => Page 01-3.)
    When doing this the ignition must be switched on.
 
→ Indicated on display:
Rapid data transfer    HELP
Select function XX
  • ‒ Press keys 0 and 8 for the function "Read measured value block" and confirm entry with Q key.
 
→ Indicated on display:
Read measured value block    HELP
Input display group number XXX
  • ‒ Press keys 0, 0 and 4 to select Display Group 4 and confirm entry with Q key.
 
→ Indicated on display:
(1...4 = display zones)
Read measured value block 4    ⇒
    1    2    3    4
  • ‒ Check display value for intake air temperature sender(display zone 4):

Display zones

1

2

3

4

Display Group 4: Intake air temperature with engine idling

Display

xxxx rpm

xx.xxx V

xxx.x °C

xxx.x °C

Indicates

Engine speed

Battery voltage

Coolant temperature

Intake air temperature

Range

min.: 750 rpm
max.: 6800 rpm

min.:0.000 V
max.: 15.000 V

min.: -40.0 °C
max.: 120.0 °C

min.: -40.0 °C
max.: 120.0 °C

Specification

810 ... 910 rpm

10.000...14.500 V

80.0...110.0 °C

Between ambient temperature and 120 °C 1)

Note

If the display shows a temperature that differs excessively from surrounding temperature, test wiring
=> Page 24-54

Testing wiring

  • ‒ Switch off ignition.
  • ‒ Connect test box V.A.G 1598/31 to wiring harness for engine control unit. Do not connect to the engine control unit itself.
    => Page 24-10.
 
V96-0749
  • ‒ → Test wiring between connector for intake air temperature sender...
  • ‒ ... and engine control unit for open circuit and short circuit.
  • ‒ Test for short circuits between the wires.

2-pin connector on wiring harness, socket

Test box 1598/31, socket

1

108
  • Specification: infinity ω(no connection)

If no fault is detected:
 
V96-0749
  • ‒ → Test for open circuit and short to positive or earth in the following wiring connections:

2-pin connector on wiring harness, socket

Test box V.A.G 1598/31, socket

1

85

2

108
  • Resistance in wiring: max. 1.5 ω

=> Current flow diagrams, Electrical fault finding and Fitting locations binder

If no fault is detected:

  • ‒ Fit a new intake air temperature sender (G42).

Testing coolant temperature sender -G62 > < Testing air mass meter -G70