- Fast data exchange HELP
- Dial function XX
2. Press "08" to select the "Read Block of Measured Values" function and confirm with the "Q" button. The display should show the following information:
- Reading the measured value block HELP
- Enter group number XXX
3. Press "007" to select the "Display Group 7" function and press "Q". The display should show the following information:
Reading block of measured values 7 → 15.9°C 16.7°C
4. Check the value in field 4. The temperature should rise smoothly without delays. If this field does not display the actual temperature or it is replaced with -20°C, check the sensor and the wiring to the sensor.
5. Click "→".
6. Press "06" to select the "Complete Output" function and confirm by pressing the "Q" button.
7. Turn off the ignition.
8. Disconnect the wire connector from the coolant temperature sensor, (figure 4A.13). Measure the resistance between contacts 1 and 3 of the sensor.
Figure 4A.13. Disconnect the wiring connector from the coolant temperature sensor.
9. The set value is shown in the figure 4A. 14. Area A shows the resistance in the temperature range of 0-50°C, area B shows the resistance in the temperature range of 50-100°C. For example, a temperature of 30°C corresponds to a resistance of 1500-2000 Ohms; a temperature of 80°C corresponds to a resistance of 275-375 Ohms.
Figure 4A.14. Diagram for determining the resistance of the coolant temperature sensor depending on the temperature.
10. If the specified value is not achieved, replace the sensor.
11. If the specified value is reached, connect the VAG 1598/30 tester to the engine control unit wiring harness. Check the wires between the tester and the 4-pin connector for continuity: pin 1 + socket 3/28, pin 3 + socket 3/32 (figure 4A.15) Set value: max 1.5 0m.
Figure 4A.15. 4-pin coolant temperature sensor connector.
12. Check the 4-pin connector wires for a short to the positive or negative battery terminal.
Set value: ∞ Ohm.
13. If no fault is found in the wires, then replace the CDI injection system control unit.
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