A 2000 Jetta City Pioneer AT sedan, equipped with AHP engine and 01M 4-speed automatic transmission. Mileage of 15,000 km, the owner reflects when the shift lever to R block, the shift lever to lock the electromagnet "click, click" ring.
    The test found that when the lock electromagnet "click, click" ring, hand touch shift lever vibration, try to shift lever to other gears, there is no exception. Shift lever lock solenoid is located in the lower part of the shift lever, its role is to turn on the ignition switch and depress the brake pedal, the solenoid to lift the P gear lock function, allowing the shift lever can be attached to other block Bit; otherwise, the solenoid is in the locked state, to prevent the shift lever from the P gear slide to other gears. It can be seen, locking the electromagnet "click, click" ring with the transmission control unit.
    (See Quick Data Transfer Function) -02 (Automatic Transmission Address Code), press "Q" key to confirm, the result shows "the electronic control unit no response" to the car fault computer diagnosis instrument V.A.G1551, enter 01 (select the fast data transmission function) The electronic control unit can not be accessed, should first check whether the normal power supply. Electronic control unit a total of 68 feet, the 1 foot ground, 45 feet connected to the 30 line, 23 feet on the 15 line, 60 feet by 14 fuse 15 line. After checking the above-mentioned power supply are normal, suspected electronic control unit damage. Replace the electronic control unit, the shift lever to R block, shift lever to lock the electromagnet is no longer "click, click" ring, with V.A.G1551 check can also be accessed, this troubleshooting.
    As the car control unit failure, shift lever lock electromagnet will be in the R block when unconstrained in a state of disorder, resulting in abnormal sound. At the same time, the system into the emergency state, when the shift lever is located in the D-bit, the system can only achieve emergency stop 3. In this case the general driver will not be aware of the obvious feeling of abnormal gear, so the user intuition that is R block abnormal sound, the car to the service station for maintenance.