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 «007» to select a function «Group 007 display» and press «Q». The display should show the following information:
4. If real information is not displayed in field 1 or it is replaced by a temperature of -5.4°C, check the sensor and the wires going to it.
5. Click «→».
6. Click «06» to select a function «Output Completion» and confirm by pressing the button «Q».
7. Turn off the ignition.
8. If there is no real display in field 1 or the temperature is -5.4°C, check the coolant temperature sensor and wires:
- disconnect the ten-pin wiring connector from the sensor (connector for the fuel injection quantity adjustment mechanism on the injection pump) (rice. 7.19);
- measure the resistance between pins 4 and 7 (pic. 7.56). The set value is shown in fig. 7.57. Area A shows the resistance in the temperature range 0-50°C, area B shows the resistance in the temperature range 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.
9. If the specified value is not reached, replace the injection pump.
10. If the set value is reached:
- connect the VAG 1598/2 tester to the engine control unit wiring harness (rice. 7.38);
- check the wire between the tester and the connector for an open circuit: pin 4 and socket 76, pin 7 and socket 53 (pic. 7.58). Set value: 1.5 ohm;
- additionally check the wires for shorting one to the other, to «mass» vehicle and to the positive pole of the battery. Specification resistance: ∞ Ohm.
11. If no fault is found in the wires, replace the engine control unit.
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