Toyota 4Runner: Transmission Control Switch Circuit

Toyota 4Runner Service Manual / Drivetrain / A750e Automatic Transmission / Transaxle / Automatic Transmission System / Transmission Control Switch Circuit

DESCRIPTION

After moving the shift lever to S, it is possible to switch the shift range between "1" (S1 range) and "5" (S5 range) using the transmission control switch.

Shifting to "+" once raises the shift range by one, and shifting to "-" once lowers the shift range by one.

WIRING DIAGRAM

PROCEDURE

1.	INSPECT TRANSMISSION CONTROL SWITCH

(a) Disconnect the F76 transmission control switch connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
3 (IG) - 7 (S)	Shift lever in S, "+" or "-"	Below 1 Ω
2 (SFTU) - 5 (E)	Shift lever held in "+" (Up-shift)	Below 1 Ω
1 (SFTD) - 5 (E)	Shift lever held in "-" (Down-shift)	Below 1 Ω
3 (IG) - 7 (S)	Shift lever not in S, "+" or "-"	10 kΩ or higher
2 (SFTU) - 5 (E)	Shift lever in S	10 kΩ or higher
1 (SFTD) - 5 (E)	Shift lever in S	10 kΩ or higher

Text in Illustration

*a	Component without harness connected (Transmission Control Switch)

REPLACE TRANSMISSION CONTROL SWITCH (TRANSMISSION FLOOR SHIFT ASSEMBLY)

2.	CHECK HARNESS AND CONNECTOR (TRANSMISSION CONTROL SWITCH - BATTERY, BODY GROUND)

(a) Disconnect the F76 transmission control switch connector.

(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
F76-3 (IG) - Body ground	Ignition switch ON	11 to 14 V
F76-3 (IG) - Body ground	Ignition switch off	Below 1 V

(d) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
F76-5 (E) - Body ground	Always	Below 1 Ω

Text in Illustration

*a	Front view of wire harness connector (to Transmission Control Switch)

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.	CHECK HARNESS AND CONNECTOR (TRANSMISSION CONTROL SWITCH - ECM)

(a) Disconnect the F50 ECM connector.

(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection	Condition	Specified Condition
F50-24 (S) - Body ground	Ignition switch ON Shift lever in S, "+" or "-"	11 to 14 V
F50-24 (S) - Body ground	Ignition switch ON Shift lever not in S, "+" or "-"	Below 1 V

(d) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
F50-16 (SFTU) - Body ground	Shift lever held in "+" (Up-shift)	Below 1 Ω
F50-22 (SFTD) - Body ground	Shift lever held in "-" (Down-shift)	Below 1 Ω
F50-16 (SFTU) - Body ground	Shift lever in S	10 kΩ or higher
F50-22 (SFTD) - Body ground	Shift lever in S	10 kΩ or higher

Text in Illustration

*a	Rear view of wire harness connector (to ECM)

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

REPAIR OR REPLACE HARNESS OR CONNECTOR

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