Volkswagen Passat can not start

Symptoms: a driving mileage of 370000 km of the 2001 Volkswagen Passat sedan. Users reflect: the car suddenly stopped after it can no longer start.

Failure Analysis: Maintenance icarsan personnel test drive and found the car in the starter motor is actually running the car, and just released the key engine immediately after the flame. The engine control unit was checked and fault code 17978 - Engine control unit was found to be restricted. Anti-theft system for testing, no fault code.

According to the results of the test run, the fuel and ignition system can be ruled out problems, so decided to focus on checking the engine control system. First check the power section, the ignition switch is turned on, ck200 key programmer with a multimeter to measure the ignition coil power supply voltage, normal. When measuring the power supply voltage of the injector, it was found that there was only 8V and the voltage was obviously low. However, measure the line between the injector and the engine control unit without any bad contact. Then in the measurement of Hall sensor, oxygen sensor, crankshaft position sensor power supply, the voltage is found below the standard value. Further measurements revealed that the output voltage of the ignition switch was low and the supply voltage was normal only when the ignition switch was in the start position, which explains why the engine can only be parked when starting. The problem Condor XC-002 lies in the ignition switch.

Troubleshooting: Replace the ignition switch, test troubleshooting.

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