Lexus ES: Transmission Control Switch Circuit
DESCRIPTION
When the shift lever is in S and moved toward "-" or "+", it is possible to select different shift ranges (S1 to S8).
Moving the shift lever toward "+" increases the shift range by one, and moving the shift lever toward "-" decreases the shift range by one.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
Inspect the fuses for circuits related to this system before performing the following procedure.
PROCEDURE
| 1. | READ VALUE USING TECHSTREAM (Shift SW Status (S Range)) |
(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 / Shift SW Status (S Range).
(e) Read the Data List according to the display on the Techstream.
Powertrain > Engine > Data List| Tester Display | Measurement Item | Range | Normal Condition | Diagnostic Note |
|---|---|---|---|---|
| Shift SW Status (S Range) | Sport (S) mode select switch status | ON or OFF |
| - |
| Tester Display |
|---|
| Shift SW Status (S Range) |
| Result | Proceed to |
|---|---|
| Data List value is normal | A |
| Data List value is not normal | B |
| B | .gif) | GO TO STEP 6 |
|
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| 2. | READ VALUE USING TECHSTREAM (SPORT SHIFT UP SW AND SPORT SHIFT DOWN SW) |
(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 / Sport Shift Up SW and Sport Shift Down SW.
(e) Read the Data List according to the display on the Techstream.
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 |
| - |
| Sport Shift Down SW | Sport shift down switch status | ON or OFF |
| - |
| 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 | | PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
|
| 3. | INSPECT TRANSMISSION CONTROL SWITCH (SHIFT LOCK CONTROL UNIT ASSEMBLY) |
(a) Disconnect the G26 transmission control switch connector.
| (b) Measure the resistance according to the value(s) in the table below. Standard Resistance:
|
|
| NG | | REPLACE TRANSMISSION CONTROL SWITCH (SHIFT LOCK CONTROL UNIT ASSEMBLY) |
|
| 4. | CHECK HARNESS AND CONNECTOR (TRANSMISSION CONTROL SWITCH - BODY GROUND) |
(a) Disconnect the G26 transmission control switch connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| G26-2 (E) - Body ground | Always | Below 1 Ω |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR (TRANSMISSION CONTROL SWITCH - BODY GROUND) |
|
| 5. | CHECK HARNESS AND CONNECTOR (TRANSMISSION CONTROL SWITCH - ECM) |
(a) Connect the G26 transmission control switch 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) - Body ground | Shift lever held in "+" (Up shift) | Below 1 Ω |
| A25-38 (SFTU) - Body ground | Shift lever not held in "+" (Up shift) | 10 kΩ or higher |
| A25-37 (SFTD) - Body ground | Shift lever held in "-" (Down shift) | Below 1 Ω |
| A25-37 (SFTD) - Body ground | Shift lever not held in "-" (Down shift) | 10 kΩ or higher |
| OK | | PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR (TRANSMISSION CONTROL SWITCH - ECM) |
| 6. | INSPECT TRANSMISSION CONTROL SWITCH (SHIFT LOCK CONTROL UNIT ASSEMBLY) |
| (a) Disconnect the G26 transmission control switch connector. |
|
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| 4 (IG) - 5 (S) | Shift lever in S, "+" or "-" | Below 1 Ω |
| Shift lever not in S, "+" or "-" | 10 kΩ or higher |
| NG | | REPLACE TRANSMISSION CONTROL SWITCH (SHIFT LOCK CONTROL UNIT ASSEMBLY) |
|
| 7. | CHECK HARNESS AND CONNECTOR (TRANSMISSION CONTROL SWITCH (POWER SOURCE)) |
(a) Disconnect the G26 transmission control switch connector.
(b) Turn the engine switch on (IG).
(c) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| G26-4 (IG) - Body ground | Engine switch on (IG) | 11 to 14 V |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR (TRANSMISSION CONTROL SWITCH (POWER SOURCE)) |
|
| 8. | CHECK HARNESS AND CONNECTOR (TRANSMISSION CONTROL SWITCH - ECM) |
(a) Disconnect the G26 transmission control switch 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 |
|---|---|---|
| G26-5 (S) - A25-17 (S) | Always | Below 1 Ω |
| G26-5 (S) or A25-17 (S) - Body ground and other terminals | Always | 10 kΩ or higher |
| OK | | PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR (TRANSMISSION CONTROL SWITCH - ECM) |
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Installation
INSTALLATION CAUTION / NOTICE / HINT HINT:
Use the same procedure for the RH side and LH side.
The following procedure is for the LH side.
PROCEDURE 1. PRECAUTION NOTICE: After turning the engine switch (for Gasoline Model) or power switch (for HV Model) off, waiting time may be required bef
