Inspection Procedure: Procedure
WARNING: This page is about a different car, the 2010 Lexus IS 250. However, it is still accessible from the selected car via links, so may be relevant.
- CHECK HARNESS AND CONNECTOR (BATTERY - TRANSMISSION CONTROL SWITCH)
- Disconnect the transmission control switch connector of shift lock control unit assembly.
- Measure the voltage according to the value(s) in the table below.
Standard voltage
Switch Condition Tester Connection Specified Condition Engine switch on (IG) 3 - Body ground 10 to 14 V Engine switch off ↑ Below 1 V
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.
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Standard resistance
Tester 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 resistance between each terminal of shift lock control unit assembly when the shift lever is moved to each position.
Standard resistance
Shift 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 resistance between each terminal of 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 shift lock control unit assembly.
- Disconnect the ECM connector.
- Turn the engine switch on (IG) position, and measure the voltage according to the value(s) in the table below when the shift lever is moved to each position.
Standard voltage
Shift Position Tester Connection Specified Condition S, "+" and "-" A6-9 (S) - Body ground 10 to 14 V Except S, "+" and "-" ↑ Below 1 V - Turn the engine switch off position.
- 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
Shift Position Tester Connection Specified Condition Press continuously
"+"
(Up shift)A6-30 (SFTU) - Body ground Below 1 Ω S ↑ 10 kΩ or higher Press continuously
"-"
(Down shift)A6-19 (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