DTC 91
The acceleration sensor detects vehicle vertical acceleration. The sensor has a piezoelectric ceramic disk supported at its center. When the vehicle accelerates, the ceramic disk flexes and the piezoelectric ceramic generates an electrical charge. The electrical circuit converts this electrical charge into voltage proportional to the acceleration, and outputs it to the ECU.
There is an acceleration sensor inside each front height control sensor, and one at the right rear. The deceleration of left rear is inferred from the data of the 3 sensors.
Code 91 corresponds to the front RH acceleration sensor circuit.
Once the ECU stores diagnosis trouble code 91 in memory, damping force control is not carried out until a normal signal is input to the ECU from acceleration sensor. However, control is resumed if the ignition switch is turned off, then on again.
Wiring Diagram:
Inspection Procedure - Step 1:
Step 2:
