The instrument's failure to receive the eecu information indicates that the vehicle control unit (VECU) cannot receive the engine control unit (EECU) signal. When the instrument does not receive the eecu information, there are several methods to detect the faulty line.

1. Pull out the booster pressure and temperature sensor and open the ignition lock to the 0N position.

2. Measure the resistance between numbers 1 1 can-H and NO. 12 can-L is in the cab and turn the ignition lock to the on position.

3. Unplug the VECUSL3 plug. Measure the terminal resistance between pin 6 and pin 7 as 130 ohm, and the terminal resistance between pin 3 and pin 4 as 133 ohm. No obvious problems were found.

4. Unplug the VECUSL3 plug:

Turn the ignition lock to the on position:

The ground voltage of pin 6 is 1.9V, the ground voltage of pin 7 is 3V, the ground voltage of pin 3 is 2.4V, and the ground voltage of pin 4 is 2.4v. It is judged that the communication voltage between EECU and VECU is abnormal.

5. Disconnect the main power supply.

Functions of eecu:

Like ordinary computers, it consists of microprocessor (CPU), memory (ROM, RAM), input/output interface (I/O), analog-to-digital converter (A/D) and large-scale integrated circuits such as shaping and driving. Simply put, "ecu is the brain of a car." Ecu also refers to eecu. Million car purchase subsidy