DTC 21

DTC 21 - SUSPENSION CONTROL ACTUATOR CIRCUIT

CIRCUIT DESCRIPTION
ECU sends a signal to suspension control actuator to drive the rotary valve of the shock absorber and the air valve of the pneumatic cylinder simultaneously, thus changing the shock absorber damping force and the suspension spring rate. A suspension control actuator is fitted to each pneumatic cylinder.





The actuator is driven electromagnetically so that it can accurately follow the driving conditions that change frequently.

*1: Code 21 corresponds to the front suspension control actuator circuit.
Code 22 corresponds to the rear suspension control actuator circuit.

Once the ECU stores diagnostic trouble code 21 or 22 in memory, damping force and spring rate controls are not carried out until a normal signal is input to the ECU from the suspension control actuator.

However, control is resumed if the ignition switch is turned off, then on again.





DIAGNOSTIC CHART

HINT 1:
- When diagnostic trouble code "21" is displayed, check the front suspension control actuator circuit.
- When diagnostic trouble code "22" is displayed, check the rear suspension control actuator circuit.

HINT 2:
- When diagnostic trouble code 21 or 22 is displayed, perform inspection from step [2].





WIRING DIAGRAM

Step 1:

Step 2:

Step 3:

*1: However, when diagnostic trouble code 21 or 22 is displayed, check and replace suspension ECU.

INSPECTION PROCEDURE

HINT 1:
- When diagnostic trouble code "21" is displayed, check the front
suspension control actuator circuit.
- When diagnostic trouble code "22" is displayed, check the rear suspension control actuator circuit.

HINT 2:
- When diagnostic trouble code 21 or 22 is displayed, perform inspection from step [2].