Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Inspection Procedure
- CHECK DTC
- Is a DTC output for ABS?
Result
DTC OUTPUT RESULTCondition Proceed to DTC is not output A DTC is output B
B : REPAIR CIRCUIT INDICATED BY OUTPUT DTC
A: Go to next step
- Is a DTC output for ABS?
- INSPECT SKID CONTROL ECU CONNECTOR SECURELY CONNECTED
- Check the ECU connector's connecting condition.
OK:
The connector should be securely connected.
NG: CONNECT CONNECTOR TO ECU CORRECTLY
OK: Go to next step
- Check the ECU connector's connecting condition.
- INSPECT BATTERY
- Check the battery voltage.
Standard voltage:
11 to 14 V
NG: INSPECT CHARGING SYSTEM
OK: Go to next step
- Check the battery voltage.
- INSPECT SKID CONTROL ECU (IG1 TERMINAL)
- WHEN USING TECHSTREAM
- Connect Techstream to the DLC3.
- Start the engine.
- Select Data List mode on Techstream.
ABS/VSC/TRAC:
ABS/VSC/TRAC DATA LISTTester Display Measurement Item/Range Diagnostic Note ECU IG Power Voltage ECU power supply voltage / TOO LOW / NORMAL/TOO HIGH TOO LOW: Less than 9.8 V
NORMAL: 9.8 to 14.0 V
TOO HIGH: More than 14.0 V - Read the voltage condition output from the ECU displayed on Techstream.
OK:
"Normal" is displayed.
- WHEN NOT USING TECHSTREAM
- Disconnect the skid control ECU connector.
- Turn the ignition switch to the ON position.
- Measure the voltage according to the value(s) in the table below.
Standard voltage
VOLTAGE SPECIFIED CONDITIONTester Connection Condition Specified Condition S1-46 (IG1) - Body ground IG switch ON 10 to 14 V
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (IG1 CIRCUIT)
OK: Go to next step
- WHEN USING TECHSTREAM
- CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - COMBINATION METER)
- Disconnect the skid control ECU connector and combination meter connector.
- Measure the resistance according to the value(s) in the table below.
Standard resistance
RESISTANCE SPECIFIED CONDITIONTester Connection Specified Condition C11-8 - S1-17 (WA) Below 1 Ω - Measure the resistance according to the value(s) in the table below.
Standard resistance
RESISTANCE SPECIFIED CONDITIONTester Connection Specified Condition S1-17 (WA) - Body ground 10 kΩ or higher
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
OK: Go to next step
- INSPECT SKID CONTROL ECU (GND TERMINAL)
- Disconnect the skid control ECU connector.
- Measure the resistance according to the value(s) in the table below.
Standard resistance
RESISTANCE SPECIFIED CONDITIONTester Connection Specified Condition S1-32 (GND2) - Body ground Below 1 Ω
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (GND CIRCUIT)
OK: Go to next step
- INSPECT COMBINATION METER ASSEMBLY
- Check combination meter assembly (See REMOVAL ).
NG: REPLACE COMBINATION METER ASSEMBLY
OK: REPLACE BRAKE ACTUATOR ASSEMBLY
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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