DTC C1721/21, C1723/23: Front Damping Force Control Actuator Circuit Malfunction; Rear Damping Force Control Actuator Circuit Malfunction: Description
WARNING: This page is about a different car, the 2007 Toyota Land Cruiser. However, it is still accessible from the selected car via links, so may be relevant.
The ECU sends a signal to the damping force control actuator to drive the rotary valve of the shock absorber changing the shock absorber damping force.
The actuator is driven electromagnetically by step motor so that it can accurately follow the driving conditions that change frequently.
DTC DETECTION CONDITION TABLE
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| C1721/21 | When detecting the over current detection condition (When the condition that the current between the actuator drive terminal of ECU and GND is 3.5 to 6.0 A or more continued for 1 +/- 0.5 msec.) 10 times continuously. |
|
| C1723/23 | When detecting the over current detection condition (When the condition that the current between the actuator drive terminal of ECU and GND is 3.5 to 6.0 A or more continued for 1 +/- 0.5 msec.) 10 times continuously. |
|
HINT:
- DTC C1721/21 corresponds to the front damping force control actuator circuit.
- DTC C1723/23 corresponds to the rear damping force control actuator circuit.
Fail-safe function:
If a trouble occurs in the front or rear wheel damping force control actuator circuit, the ECU prohibits the damping force control after the ECU has returned the damping force of the other side wheel to the normal condition.