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 007" function and press "Q". The display should show the following information:
4. If field 1 does not display real information or it is replaced with a temperature of -5.4°C, check the sensor and the wires going to it.
5. Click "→".
6. Press "06" to select the "Complete Output" function and confirm by pressing the "Q" button.
7. Turn off the ignition.
8. If there is no real display in field 1 or the temperature displayed is -5.4°C, check the coolant temperature sensor and wires:
- disconnect the 10-pin wiring connector from the sensor (connector of the fuel injection quantity adjustment mechanism on the high pressure fuel pump) (fig. 7.19);
- measure the resistance between contacts 4 and 7 (Fig. 7.56). The specified value is shown in Fig. 7.57. 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.
9. If the specified value is not achieved, replace the fuel injection pump.
10. If the specified value is reached:
- connect the VAG 1598/2 tester to the engine control unit wiring harness (fig. 7.38);
- check the wire between the tester and the socket for open circuit: contact 4 and socket 76, contact 7 and socket 53 (Fig. 7.58). Specified value: 1.5 Ohm;
- additionally, check the wires for short circuits to each other, to the vehicle ground, and to the positive battery terminal. Specification resistance: ∞ Ohm.
11. If no fault is found in the wires, replace the engine control unit.
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