Lexus ES manuals

Lexus ES: Shift Paddle Switch Circuit

Lexus ES (XZ10) Service Manual / Drivetrain / Ua80e (automatic Transmission / Transaxle) / Automatic Transaxle System / Shift Paddle Switch Circuit

DESCRIPTION

Moving the shift lever to S enables the shift range to be selected. The shift range can be selected by operating the "+" or "-" shift paddle switch.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

After turning the engine switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work.

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PROCEDURE

1.

READ VALUE USING TECHSTREAM (SPORT SHIFT SWITCH STATUS)

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Turn the Techstream on.

(d) Enter the following menus: Powertrain / Engine / Data List.

(e) According to the display on the Techstream, read the Data List.

Powertrain > Engine > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Sport Shift Up SW

Sport shift up switch status

ON or OFF
  • ON: Shift lever held in "+" or "+" shift paddle switch operated
  • OFF: Shift lever not held in "+" and "+" shift paddle switch released

-

Sport Shift Down SW

Sport shift down switch status

ON or OFF
  • ON: Shift lever held in "-" or "-" shift paddle switch operated
  • OFF: Shift lever not held in "-" and "-" shift paddle switch released

-
Powertrain > Engine > Data List

Tester Display

Sport Shift Up SW

Sport Shift Down SW

Result

Proceed to

Data List values are normal

A

Data List values are not normal

B
A

CHECK FOR INTERMITTENT PROBLEMS

B

2.

CHECK HARNESS AND CONNECTOR (SHIFT PADDLE SWITCH CIRCUIT)

(a) Disconnect the A25 ECM connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A25-38 (SFTU) - Body ground

"+" (Up shift) shift paddle switch operated and held

Below 2.5 Ω

"+" (Up shift) shift paddle switch not operated

1 MΩ or higher

A25-37 (SFTD) - Body ground

"-" (Down shift) shift paddle switch operated and held

Below 2.5 Ω

"-" (Down shift) shift paddle switch not operated

1 MΩ or higher
OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

3.

CHECK HARNESS AND CONNECTOR (SPIRAL CABLE SUB-ASSEMBLY - ECM)

(a) Disconnect the G20 spiral cable sub-assembly connector.

(b) Disconnect the A25 ECM connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A25-38 (SFTU) - G20-8 (SUP)

Always

Below 1 Ω

A25-37 (SFTD) - G20-1 (SDN)

Always

Below 1 Ω

A25-38 (SFTU) or G20-8 (SUP) - Body ground

Always

10 kΩ or higher

A25-37 (SFTD) or G20-1 (SDN) - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (SPIRAL CABLE SUB-ASSEMBLY - ECM)
OK

4.

CHECK HARNESS AND CONNECTOR (SPIRAL CABLE SUB-ASSEMBLY - BODY GROUND)

(a) Disconnect the G20 spiral cable sub-assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

G20-2 (ECC) - Body ground

Always

Below 1 Ω
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (SPIRAL CABLE SUB-ASSEMBLY - BODY GROUND)
OK

5.

INSPECT SPIRAL CABLE SUB-ASSEMBLY

(a) Inspect the spiral cable sub-assembly.

Click here

NG

REPLACE SPIRAL CABLE SUB-ASSEMBLY

OK

6.

INSPECT SHIFT PADDLE SWITCH LH (TRANSMISSION SHIFT SWITCH ASSEMBLY)

(a) Remove the shift paddle switch LH (transmission shift switch assembly).

Click here

*a

Component without harness connected

(Shift Paddle Switch LH (Transmission Shift Switch Assembly))

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A-1 (SDN) - A-2 (ECC)

"-" (Down shift) shift paddle switch operated and held

Below 2.5 Ω

"-" (Down shift) shift paddle switch not operated

1 MΩ or higher

A-1 (SDN) - A-3 (ECC1)

"-" (Down shift) shift paddle switch operated and held

Below 2.5 Ω

"-" (Down shift) shift paddle switch not operated

1 MΩ or higher
NG

REPLACE SHIFT PADDLE SWITCH LH (TRANSMISSION SHIFT SWITCH ASSEMBLY)

OK

7.

INSPECT SHIFT PADDLE SWITCH RH (TRANSMISSION SHIFT SWITCH ASSEMBLY)

(a) Remove the shift paddle switch RH (transmission shift switch assembly).

Click here

*a

Component without harness connected

(Shift Paddle Switch RH (Transmission Shift Switch Assembly))

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

B-1 (SUP) - B-2 (ECC)

"+" (Up shift) shift paddle switch operated and held

Below 2.5 Ω

"+" (Up shift) shift paddle switch not operated

1 MΩ or higher
NG

REPLACE SHIFT PADDLE SWITCH RH (TRANSMISSION SHIFT SWITCH ASSEMBLY)

OK

8.

INSPECT NO. 1 SWITCH WIRE

(a) Install the shift paddle switch LH and RH (transmission shift switch assembly).

Click here

*a

Front view of wire harness connector

(to Spiral Cable Sub-assembly)

(b) Disconnect the z5 No. 1 switch wire connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

z5-2 (SUP) - z5-3 (ECC)

"+" (Up shift) shift paddle switch operated and held

Below 2.5 Ω

"+" (Up shift) shift paddle switch not operated

1 MΩ or higher

z5-4 (SDN) - z5-3 (ECC)

"-" (Down shift) shift paddle switch operated and held

Below 2.5 Ω

"-" (Down shift) shift paddle switch not operated

1 MΩ or higher
OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

REPLACE NO. 1 SWITCH WIRE

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