The structure of the solenoid valve can be seen that the reason for the control oil not stopping after the solenoid valve coil is de-energized is that the upper small spool valve cannot be reset; the small spool valve reset spring is not strong enough; the large spool valve oil drain circuit is not smooth, resulting in a large slip The control oil of the valve cannot be discharged; the large slide valve has more oil in the memory and is relatively stable for a long time. Only when the vehicle is stopped, the oil is discharged, causing the precipitation of impurities in the oil, and the oil discharge pipe is thin and easily blocked by dirt. Blockage of the oil drain pipe of the large spool valve will result in poor oil drain when parking, delaying the operation time of the large spool valve; insufficient force of the large spool valve or the return spring.
Fault check and processing, NDO004 is set to 0, NDO004 is not set to 0. Check processing: No abnormality is detected on the appearance check of the reset button. Press PB02 to perform the experiment at the scene. After 45 seconds, the NSW085 is set to 0, and all the operations are normal; the DCS sequence control table is performed. No abnormalities were found in the analysis and examination; NDO004 was successfully set to 0 by multiple chain experiments; no abnormality was found in the measurement of the DCS output channel.
After the NDO004 is set to 0, the solenoid valve is not de-energized. Check the relay contacts. If the resistance is not broken or the resistance is small, the relay contacts can be considered as no problem, but the new relay is replaced. In order to determine whether the neutral line is grounded, check the line with a shaker. The resistance of the field cable and the main control cable to ground is above 100M, and no abnormality is found in the cable. After the solenoid valve is de-energized, the control of the oil is stopped. Firstly, check the solenoid valve size spool return spring. It is found that the slide valve moves smoothly under the action of the spring force, and the spring is confirmed to have no problem. Check the activity of the large and small spools, and it is considered that the slide card is unlikely to malfunction.
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