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
- INSPECT TRANSMISSION CONTROL SWITCH
- Disconnect the L42 transmission control switch connector.
- Measure the resistance between each terminal of the shift lock control unit when the shift lever is moved to each position.
Standard resistance
TESTER CONNECTION SPECIFIED CONDITION CHARTTester Connection Switch condition Specified Condition 3 (IG) - 7 (S) Shift lever position S, "+" and "-" Below 1 Ω 2 (SFTU) - 5 (E) Shift lever position continuously shift to "+" (Up-shift) Below 1 Ω 1 (SFTD) - 5 (E) Shift lever position continuously shift to "-" (Down-shift) Below 1 a 3(IG)-7(S) Shift lever position not on S, "+" and "-" 10 kΩ or higher 2 (SFTU) - 5 (E) Shift lever position S 10 kΩ or higher 1 (SFTD) - 5 (E) Shift lever position S 10 kΩ or higher
NG: REPLACE TRANSMISSION FLOOR SHIFT ASSEMBLY (TRANSMISSION CONTROL SWITCH) (See ON-VEHICLE INSPECTION )
OK: GO TO NEXT STEP
- CHECK HARNESS AND CONNECTOR (TRANSMISSION CONTROL SWITCH - BATTERY, BODY GROUND)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
- Disconnect the L42 transmission control switch connector.
- Turn the engine switch on (IG).
- Measure the voltage of the wire harness side connector.
Standard voltage
TESTER CONNECTION SPECIFIED CONDITION CHARTTester Connection Switch Condition Specified Condition L42-3 (IG) - Body ground Engine switch on (IG) 11 to 14 V L42-3 (IG) - Body ground Engine switch off Below 1 V - Turn the engine switch off.
- Measure the resistance of the wire harness side connector.
Standard resistance
TESTER CONNECTION SPECIFIED CONDITION CHARTTester Connection Condition Specified Condition L42-5 (E) - Body ground Always Below 1 Ω
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
OK: GO TO NEXT STEP
- CHECK HARNESS AND CONNECTOR (TRANSMISSION CONTROL SWITCH - ECM)
- Turn the engine switch on (IG).
- Measure the voltage of the wire harness side connector.
Standard voltage
TESTER CONNECTION SPECIFIED CONDITION CHARTTester Connection Switch Condition Specified Condition A13-16 (S) - Body ground - Engine switch on (IG)
- Shift lever position S, "+" and "-"
11 to 14 V A13-16 (S) - Body ground - Engine switch on (IG)
- Shift lever position not on S, "+" and "-"
Below 1 V - Turn the engine switch off.
- Disconnect the A13 ECM connector.
- Measure the resistance of the wire harness side connector.
Standard resistance
TESTER CONNECTION SPECIFIED CONDITION CHARTTester Connection Switch Condition Specified Condition A13-8 (SFTU) - Body ground Shift lever position continuously shift to "+" (Up-shift) Below 1 Ω A13-7 (SFTD) - Body ground Shift lever position continuously shift to "-" (Down-shift) Below 1 Ω A13-8 (SFTU) - Body ground Shift lever position S 10 kΩ or higher A13-7 (SFTD) - Body ground Shift lever position S 10 kΩ or higher
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE (See 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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