The HECU monitors the operation of the valves by checking the drive circuit of the solenid valves, and then sets this code when the unexpcted drive voltage is detected.
For example, the HECU sets the DTC if the electrical feedback signal does not match the actuation signal for the corresconding valve.
Item | Detecting Condition | Possible cause | |
DTC Strategy |
•
Voltage Monitoring | 1. Faulty HECU | |
Case 1 | Monitoring Period |
•
Once when Vveh is over 30kph(18.6mph) after ignition on | |
Enable Conditions |
•
When the fault from valve is detected by monitoring valve feedback signal at the test. (The test acutuate valve and pump motor in series and monitors short fault of valve lines. Pump motor is actuated in the same time.) - Stop ABS/EBD/ESP(ESC) control immediately when a fault occurs | ||
Case 2 | Monitoring Period |
•
Continuously | |
Enable Conditions |
•
Monioring if the electrical feedback signal mismatch the unactuation signal to the corresponding valve for more than 40ms or actuation signal over 60ms. Monitoring system reports a failure if the situation is the same after 60ms from the timing - Stop ABS/EBD/ESP(ESC) control immediately when a fault occurs | ||
Fail Safe |
•
The ABS/EBD/ESP(ESC) functions are inhibited
•
The ABS/EBD/ESP(ESC) warning lamps are activated | ||
