2. Click «08» to select a function «Reading a block of measured values» and confirm by pressing the button «Q». The display should show the following information:
3. Click «002» to select a function «Group 2 display» and press «Q». The display should show the following information:
4. Read the temperature of the incoming air in field 4 of the display.
Continue testing at -55°C
5. Disconnect harness connector 1 from sensor 2 (pic. 5.53).
6. Shunt pins 1 and 4 of the wiring connector using auxiliary wires from the VAG 1594 tester and observe the readings on the display.
7. Approximately 130°C or higher on the display: replace the nozzle support bracket together with the intake air temperature sensor.
8. On the display approximately -55°С:
- click «→»;
- click «06» to select a function «Output Completion» and confirm by pressing the button «Q»;
- turn off the ignition;
- connect the tester VAG 1598/18 to the wiring harness of the engine control unit;
- check the wire between the tester and the connector for an open circuit: socket 43 of the tester and pin 4 of the four-pin wiring connector (rice. 5.45). Set value: max. 1.5 ohm.
- check the wires for a short to positive. Set value: ∞ Ohm.
- check the wire between the tester and the connector for an open circuit: socket 17 of the tester and pin 1 of the four-pin wiring connector. Set value: max. 1.5 ohm.
9. If no fault is found in the wires, then replace the engine control unit.
Continue testing at 130°C and above
10. Disconnect harness connector 1 from sensor 2 (pic. 5.54).
11. The display shows approximately -55°C: replace the nozzle support bracket together with the intake air temperature sensor.
12. Approximately 130°C and higher on the display:
- click «→»;
- click «06» to select a function «Output Completion» and confirm by pressing the button «Q»;
- turn off the ignition;
- disconnect the wiring connector from the engine control unit;
- check the wire to pin 4 of the four-pin engine control unit wiring connector for a short to pin 1 of the wire and to «mass». Set value: ∞ Ohm.
13. If no fault is found in the wires, then replace the engine control unit.
Continued test at ambient temperature
14. Spray with a cooling spray (arrow) on the sensor, observing the temperature value (pic. 5.55). She must go down.
15. Click «→».
16. Click «06» to select a function «Output Completion» and confirm by pressing the button «Q».
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