P0720 CHERY.Vehicle Speed.
Repair of Chery QQ box according to fault analysis P0720 CHERY of AMT system.
| Definition | Analysis | Fault | Solution |
| Car speed sensor. | 1. Open cable or odometer short circuit; 2. Faulty auto parts s11-3802020. If the device is faulty, the vehicle speed signal can be transmitted; 3. The odometer does not engage with the differential. | 1. Shifting is limited, 2nd gear is the maximum allowable | Car speed sensor replacement. |
Possible causes when the odometer does not work while driving S11 AMT: faulty odometer s11-3802020, faulty sensor circuit, faulty taillight circuit, faulty taillight switch s11-3729011ab.
The step-by-step instructions for solving the P0720 CHERY error, namely checking and installing the car speed sensor s11-3802020, consist of the following items:
Item №1. Using a tester, measure the resistance between pins 1 and 2, which should be in the range of 20-30 ohms.
Item №2. An overview of the speed sensor circuit consists of checking the voltage between the terminal on the foam 1 and ground and if it is 0V, then it indicates an open sensor circuit, which prompts us to go to check the fuse box.
Item №3. The F28 fuse in the Chery QQ circuit is also responsible for the taillight, so if the odometer has started after replacing a blown fuse, but does not work again in reverse after a few meters, look for the cause in the taillight circuit.
Item №4. A review of the taillight switch circuit consists of checking the voltage between the terminal on the foam 1 and ground and if it is about 12V, then this indicates a normal circuit, which prompts us to move on to check the taillight switch s11-3729011ab.
Item №5. In the case of working circuits, fuse, reversing sensor, there are several cases when the odometer does not work while driving, or the new sensor is not original, or the sensor gear does not engage with the differential gear qr512-1701604, if the latter is broken, which is extremely rare.
