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 HARNESS AND CONNECTOR (BATTERY - TRANSMISSION CONTROL SWITCH)
- Disconnect the transmission control switch connector of the shift lock control unit assembly.
- Measure the voltage according to the value(s) in the table below.
Standard voltage
VOLTAGE SPECIFICATIONSwitch Condition Tester Connection Specified Condition Engine switch on (IG) 3 - Body ground 10 to 14 V Engine switch off Below 1 V
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
OK: Go to Next Step
- CHECK HARNESS AND CONNECTOR (TRANSMISSION CONTROL SWITCH - BODY GROUND)
- Measure the resistance according to the value(s) in the table below.
Standard resistance
RESISTANCE SPECIFICATIONTester Connection Specified Condition 5 - Body ground Below 1 Ω
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
OK: Go to Next Step
- Measure the resistance according to the value(s) in the table below.
- INSPECT TRANSMISSION CONTROL SWITCH
- Measure the resistance between each terminal of the shift lock control unit assembly when the shift lever is moved to each position.
Standard resistance
RESISTANCE SPECIFICATIONShift Position Tester Connection Specified Condition S, "+" and "-" 3 - 7 Below 1 Ω Except S, "+" and "-" 10 kΩ or higher Press continuously "+" (Up shift) 2 - 5 Below 1 Ω S 10 kΩ or higher Press continuously "-" (Down shift) 1 - 5 Below 1 Ω S 10 kΩ or higher
NG: REPLACE TRANSMISSION CONTROL SWITCH
OK: Go to Next Step
- Measure the resistance between each terminal of the shift lock control unit assembly when the shift lever is moved to each position.
- CHECK HARNESS AND CONNECTOR (TRANSMISSION CONTROL SWITCH - ECM)
- Connect the transmission control switch connector of the shift lock control unit assembly.
- Disconnect the A10 ECM connector.
- Turn the engine switch on (IG), and measure the voltage according to the value(s) in the table below when the shift lever is moved to each position.
Standard voltage
TRANSMISSION CONTROL SWITCH - ECM VOLTAGE SPECIFICATIONShift Position Tester Connection Specified Condition S, "+" and "-" A10-25 (S) - Body ground 10 to 14 V Except S, "+" and "-" Below 1 V - Turn the engine switch off.
- Disconnect the ECM connector.
- Measure the resistance according to the value(s) in the table below when the shift lever is moved to each position.
Standard resistance
TRANSMISSION CONTROL SWITCH - ECM RESISTANCE SPECIFICATIONShift Position Tester Connection Specified Condition Press continuously "+" (Up shift) A10-16 (SFTU) - Body ground Below 1 Ω S 10 kΩ or higher Press continuously (Down shift) A10-51 (SFTD) - Body ground Below 1 Ω S 10 kΩ or higher
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
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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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