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 "007" to select the "Display Group 7" function and press "Q". The display should show the following information:
Check the coolant temperature value in field 4. It should increase smoothly without delay. In the fault condition, the fuel temperature is displayed.
4 Click "→".
5. Press "06" to select the "Complete Output" function and confirm by pressing the "Q" button.
6. Turn off the ignition.
7. If there is no real display in field 4 or the fuel temperature is displayed, check the coolant temperature sensor and wires:
(The original text can be found on the portal: VWManual)
- press "→";
- press "06" to select the "Complete Output" function and confirm by pressing the "Q" button;
- turn off the ignition;
- disconnect the wiring connector from the sensor (arrow) (Fig. 7.52).
- measure the resistance between contacts C (signal) and D (ground) of the sensor (Fig. 7.53). The specified value is shown in Fig. 7.54. Area A shows the resistance in the temperature range of 0-50°C, area B - the resistance in the temperature range of 50-100°C. For example, a temperature of 30°C corresponds to a resistance of 1500-2000 Ohm; temperature 80°C corresponds to resistance 275-375 Ohm.
8. If the specified value is not achieved, replace the sensor.
9. If the specified value is reached:
- connect the VAG 1598/22 tester to the engine control unit wiring harness (fig. 7.38);
- check the wire between the tester and the socket for open circuit: contact 1 and socket 70, contact 3 and socket 54 (Fig. 7.55). Specified value: 1.5 Ohm;
- additionally check the wires for open circuit. Specification resistance: ∞ Ohm.
10. If no fault is found in the wires, replace the engine control unit.
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