DESCRIPTION
When troubleshooting a vehicle with the diagnosis system, the only difference from the usual troubleshooting procedure is connecting the GTS to the vehicle and reading various data output from the skid control ECU (brake actuator assembly).
The skid control ECU (brake actuator assembly) stores DTCs when the ECU detects a malfunction in the ECU itself or in its circuits.
To check the DTCs, connect the GTS to the DLC3 on the vehicle. The GTS enables you to clear the DTCs, activate the various actuators, and check the Freeze Frame Data and Data List.
Check the battery voltage.
| Standard voltage |
|---|
| 11 to 14 V |
If the voltage is below 11 V, recharge the battery before proceeding to the next step.
Check the DLC3 (Click here).
DIAGNOSIS
If the skid control ECU (brake actuator assembly) detects a malfunction, the ABS warning light, brake warning light and slip indicator light will come on in order to warn the driver.
DTCs are simultaneously stored in memory. The DTCs can be read by connecting SST between terminals TC and CG of the DLC3 and observing the blinking pattern of the ABS warning and slip indicator lights, or by connecting the GTS (Click here).
This system has a Test Mode (Signal Check) function.
The DTCs can be read by connecting the GTS (Click here).
WARNING LIGHT AND INDICATOR LIGHT INITIAL CHECK
Release the parking brake.
When releasing the parking brake, move the shift lever to P (except M/T) or set chocks to hold the vehicle (for M/T) for safety.
When the brake fluid level is low, the brake warning light comes on.
When the ignition switch is turned to ON, check that the ABS warning light, brake warning light, VSC OFF indicator light and slip indicator light come on for approximately 3 seconds.
If the warning light and indicator light check result is not normal, proceed to troubleshooting for the ABS warning light, brake warning light, VSC OFF indicator light and slip indicator light circuits listed below.
| Trouble Area | See procedure |
|---|---|
| ABS warning light circuit (Remains on) | |
| ABS warning light circuit (Does not come on) | |
| Brake warning light circuit (Remains on) | |
| Brake warning light circuit (Does not come on) | |
| VSC OFF indicator light circuit (Remains on) | |
| VSC OFF indicator light circuit (Does not come on) | |
| Slip indicator light circuit (Remains on) | |
| Slip indicator light circuit (Does not come on) |