How to Troubleshoot the VSA System

System Indicator


This system has four indicators: ABS indicator (A), VSA indicator (B), VSA activation indicator (C) and brake system indicator (D). When the system detects a problem, it illuminates the appropriate indicators. Depending on the failure, the control unit determines which indicators are turned on.

 


ABS/VSA Indicator


To determine the actual cause of the problem, question the customer about the problem, taking these conditions into consideration.

Diagnostic Trouble Code (DTC)



Self-diagnosis



Kickback


The pump motor operates when the ABS or VSA is functioning, and the fluid in the reservoir is forced out to the master cylinder, causing kickback at the brake pedal.

Pump Motor



Brake Fluid Replacement/Air Bleeding


Brake fluid replacement and air bleeding procedures are identical to the procedures used on vehicles not equipped with VSA. To ease bleeding, start with the front wheels.

How to Troubleshoot DTCs


The troubleshooting flowchart procedures assume that the cause of the problem is still present and the ABS and/or VSA indicator is still on. Following the flowchart when the ABS and/or VSA indicator does not come on can result in incorrect diagnosis.
The connector illustrations show the female terminal connectors with a single outline and the male terminal connectors with a double outline.

1.Question the customer about the conditions when the problem occurred, and try to reproduce the same conditions for troubleshooting. Find out when the ABS and/or VSA indicator came on, such as during ABS control, after ABS control, when vehicle was travelling at a certain speed, etc.

2.When the ABS or VSA indicator does not come on during the test drive, but troubleshooting is done based on the DTC, check for loose connectors, poor contact of the terminals, etc. before you start troubleshooting.

3.After troubleshooting, or repairs are done clear the DTCs, and test-drive the vehicle. Make sure the ABS and VSA indicators do not come on.

How to Retrieve DTCs


1.With the ignition switch OFF, connect the HDS to the 16P data link connector (DLC) (A) under the driver's side of dashboard.

 

2.Turn the ignition switch ON (II), and follow the prompts on the HDS to display the DTC(s) on the screen. After determining the DTC, refer to the DTC Troubleshooting.

NOTE: See the HDS help menu for specific instructions.

How to Clear DTCs


NOTE: You cannot clear the DTCs manually.

1.With the ignition switch OFF, connect the HDS to the 16P data link connector (DLC) (A) under the driver's side of dashboard.

 

2.Turn the ignition switch ON (II), and clear the DTC(s) by following the screen prompts on the HDS.

NOTE: See the HDS help menu for specific instructions.

3.Do the VSA sensor neutral position memorization.