DESCRIPTION
The skid control ECU (brake actuator assembly) is connected to the combination meter assembly via CAN communication.
If any of the following is detected, the ABS warning light remains on:
The skid control ECU (brake actuator assembly) connectors are disconnected from the skid control ECU (brake actuator assembly).
There is a malfunction in the skid control ECU (brake actuator assembly) internal circuit.
There is an open in the harness between the combination meter assembly and the skid control ECU (brake actuator assembly).
The ABS control system is defective.
w/ Rear Differential Lock:
The rear differential is locked.
Tech Tips
In some cases, the GTS cannot be used when the skid control ECU (brake actuator assembly) is abnormal.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
Note
When replacing the skid control ECU (brake actuator assembly), perform Test Mode (Signal Check) to acquire the rear differential lock identification information.
Inspect the fuses for circuits related to this system before performing the following inspection procedure.
PROCEDURE
CHECK CAN COMMUNICATION SYSTEM
Check if CAN communication system DTCs are output.
for LHD: Click here
for RHD: Click here
Result | |||
---|---|---|---|
|
DTC is output |
CHECK CAN COMMUNICATION SYSTEM for LHD: Click here |
DTC is not output |
CHECK IF BRAKE ACTUATOR ASSEMBLY CONNECTOR IS SECURELY CONNECTED
Check if the skid control ECU (brake actuator assembly) connector is securely connected.
OK |
---|
The connector is securely connected. |
Result | |||
---|---|---|---|
|
NG |
CONNECT CONNECTOR TO BRAKE ACTUATOR ASSEMBLY CORRECTLY |
OK |
INSPECT BATTERY
Check the battery voltage.
Standard voltage |
---|
11 to 14 V |
Result | |||
---|---|---|---|
|
NG |
CHECK OR REPLACE CHARGING SYSTEM OR BATTERY for 1GD-FTV: Click here |
OK |
CHECK TERMINAL VOLTAGE (IG1 TERMINAL)
*a | Front view of wire harness connector (to Skid Control ECU [Brake Actuator Assembly]) |
Disconnect the A3 skid control ECU (brake actuator assembly) connector.
Turn the ignition switch to ON.
Measure the voltage according to the value(s) in the table below.
Standard Voltage | ||||||
---|---|---|---|---|---|---|
|
Result | |||
---|---|---|---|
|
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR (IG1 CIRCUIT) |
OK |
CHECK HARNESS AND CONNECTOR (GND1 TERMINAL)
Turn the ignition switch off.
*a | Front view of wire harness connector (to Skid Control ECU [Brake Actuator Assembly]) |
Measure the resistance according to the value(s) in the table below.
Standard Resistance | ||||||
---|---|---|---|---|---|---|
|
Result | ||||
---|---|---|---|---|
|
OK (w/o Rear Differential Lock) |
GO TO STEP 7 Click here |
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR (GND1 CIRCUIT) |
OK (w/ Rear Differential Lock) |
CHECK FOR DIFFERENTIAL SYSTEM
Reconnect the A3 skid control ECU (brake actuator assembly) connector.
Connect the GTS to the DLC3.
Turn the ignition switch to ON.
Turn the GTS on.
Enter the following menus: Powertrain / Four Wheel Drive / Trouble Codes.
Check for DTCs.
Result | |||
---|---|---|---|
|
DTCs are output |
GO TO DIFFERENTIAL SYSTEM (DIAGNOSTIC TROUBLE CODE CHART) Click here |
DTCs are not output |
READ VALUE USING GTS (ABS WARNING LIGHT)
Reconnect the A3 skid control ECU (brake actuator assembly) connector.
Connect the GTS to the DLC3.
Turn the ignition switch to ON.
Turn the GTS on.
Enter the following menus: Chassis / ABS/VSC/TRC / Data List.
According to the display on the GTS, read the Data List.
Tester Display | Measurement Item | Range | Normal Condition | Diagnostic Note |
---|---|---|---|---|
ABS Warning Light | ABS warning light | OFF or ON | OFF: Warning light off ON: Warning light on |
- |
Tester Display |
---|
ABS Warning Light |
Check the GTS display condition of the ABS warning light.
Result | |||
---|---|---|---|
|
Display of the Data List remains OFF |
INSPECT METER / GAUGE SYSTEM Click here |
Display of the Data List remains ON |
REPLACE BRAKE ACTUATOR ASSEMBLY Click here |