2. Press "08" to select the "Read measured value block" function and confirm by pressing the "Q" button. The display should show the following information:
3. Press "001" to select the "Display Group 1" function and press "Q". The display should show the following information:
4. Read the incoming air temperature in field 2 of the display.
Continue testing at -40°C
5. Disconnect the four-pin wiring connector from the coolant temperature sensor (arrow) (Fig. 4.36).
6. Shunt contacts 3 and 4 of the wiring connector using auxiliary wires from the VAG 1594 tester and observe the readings on the display (Fig. 4.37).
The display shows 129°C:
- press "→";
- press "06" to select the "Complete Output" function and confirm by pressing the "Q" button;
- turn off the ignition;
- replace the coolant temperature sensor.
On the display -40°C:
- press "→";
- press "06" to select the "Complete Output" function and confirm by pressing the "Q" button;
- turn off the ignition;
- connect the VAG 1598/31 tester to the engine control unit wiring harness (on the left in the engine compartment) (fig. 4.32). The control unit must remain disconnected;
- check the wire between the tester and the connector for open circuit: tester socket 93 and contact 3, tester socket 108 and contact 4 (fig. 4.34). Specified value: max. 1.5 Ohm.
- check the wires for short circuit to positive. Specified value: ∞ Ohms.
7. If no fault is found in the wires, then replace the coolant temperature sensor.
Continue testing at 129°C
8. Disconnect the four-pin wiring connector from the coolant temperature sensor (arrow) (Fig. 4.36).
On the display -40°C:
- press "→";
- press "06" to select the "Complete Output" function and confirm by pressing the "Q" button;
- turn off the ignition;
- replace the coolant temperature sensor.
The information is presented on the website www.vwmanual.ru
The display shows 129°C:
- press "→";
- press "06" to select the "Complete Output" function and confirm by pressing the "Q" button;
- turn off the ignition;
- connect the VAG 1598/31 tester to the engine control unit wiring harness (on the left in the engine compartment) (fig. 4.32). The control unit must remain disconnected:
- check the wire between the tester and the connector for open circuit: socket 93 of the tester and contact 3. socket 108 of the tester and contact 4 (fig. 4.34). Specified value: max. 1.5 Ohm.
- check the wires for short circuit to positive pole. Specified value: ∞ Ohms.
9. If no fault is found in the wires, then replace the coolant temperature sensor.
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