Diagnosis System

BRAKE CONTROL: VEHICLE STABILITY CONTROL SYSTEM: DIAGNOSIS SYSTEM

1. DESCRIPTION

When troubleshooting a vehicle with the diagnosis system, the only difference from the usual troubleshooting procedure is connecting Techstream to the vehicle and reading various data output from the vehicle's skid control ECU.

The skid control ECU records DTCs when the computer detects a malfunction in the computer itself or in its circuits.

To check the DTCs, connect Techstream to the DLC3 on the vehicle. Techstream enables you to cleared the DTCs, activate the various actuators, and check the Freeze Frame Data and Data List.

(a) Check the battery voltage.

Standard voltage:

11 to 14 V

If the voltage is below 11 V, recharge the battery before proceeding.

(b) Check the DLC3.





The ECU uses ISO 15765-4 for communication. The terminal arrangement of the DLC3 complies with SAE J1962 and matches the ISO 15765-4 format.

If the result is not as specified, the DLC3 may have a malfunction. Repair or replace the harness and connector.

Verify the conditions listed in the table below.

Text in Illustration









NOTICE:
*: Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the engine switch, any other switches or the doors.

HINT
Connect the cable of Techstream to the DLC3, turn the engine switch on (IG) and attempt to use the tester. If the display indicates that a communication error has occurred, there is a problem either with the vehicle or with the tester.

* If communication is normal when the tester is connected to another vehicle, inspect the DLC3 on the original vehicle.

* If communication is still not possible when the tester is connected to another vehicle, the problem may be in the tester itself. Consult the Service Department listed in the tester operator's manual.

2. DIAGNOSIS

(a) If the skid control ECU detects a malfunction, the ABS warning, BRAKE warning and SLIP indicator lights will come on in order to warn the driver.

(b) The DTCs are simultaneously stored in the memory. The DTCs can be read by connecting the 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 Techstream.

(c) This system has a Test Mode (signal check) function.

The DTC can be read by connecting SST between terminals TS and CG of the DLC3 and observing the blinking pattern of the ABS warning and SLIP indicator lights, or by connecting the Techstream Test Mode Procedure.

3. WARNING LIGHT AND INDICATOR LIGHT INITIAL CHECK

(a) Release the parking brake.

NOTICE:
When releasing the parking brake, move the shift lever to the P position for safety.

HINT
When the parking brake is applied or the level of the brake fluid is low, the BRAKE warning light comes on.

(b) When the engine switch is turned on (IG), check that the ABS warning, BRAKE warning, VSC OFF indicator, SLIP indicator, and master warning lights all come on for approximately 3 seconds.

HINT
* If the warning light and indicator light initial 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.
* If the indicator remains on, proceed to troubleshooting for the light circuit below.