DESCRIPTION
Based on signals from the transmission revolution sensors (NT, NC3 and NC), the actual gear is detected.
The ECM compares the actual gear with the shift schedule in the ECM memory to detect mechanical malfunctions of the shift solenoid valves, transmission valve body assembly and automatic transaxle assembly (clutch, brake, gear, etc.).
Actual gear when shift solenoid valve S1 (without fail-safe control) malfunction occurs: ECM commanded gear | 1st | 2nd | 3rd | 4th | 5th | 6th | 7th | 8th |
---|---|---|---|---|---|---|---|---|
*: With S1, D1 or M1 range (1st gear) selected | ||||||||
Actual gear during S1 stuck OFF malfunction | 1st (3rd)* | 2nd | 3rd | 4th | 5th | 6th | 7th | 8th |
DTC No. | Detection Item | DTC Detection Condition | Trouble Area | MIL | Memory | Note |
---|---|---|---|---|---|---|
P07507F | Shift Solenoid "A" Actuator Stuck Off | 1. Diagnosis Condition, 2. Malfunction Status, 3. Malfunction Time, 4. Other
|
| Comes on | DTC stored | SAE Code: P0751 |
MONITOR DESCRIPTION
This DTC indicates a "stuck OFF" malfunction of the shift solenoid valve S1.
The ECM commands gear shifts by turning the shift solenoid valves on or off. When the gear commanded by the ECM and the actual gear are not the same, the ECM illuminates the MIL and stores a DTC.
MONITOR STRATEGY
Related DTCs | P0751: Shift solenoid valve S1/OFF malfunction |
Required sensors/Components | Shift solenoid valve S1 |
Frequency of operation | Continuous |
Duration | 0.6 sec. |
MIL operation | 2 driving cycles |
Sequence of operation | None |
TYPICAL ENABLING CONDITIONS
The monitor will run whenever this DTC is not present. (Not circuit malfunction) | P0717, P07BF, P07C0 (Turbine speed sensor circuit) P07C1, P07C2, P2767 (Input speed sensor circuit) P0793, P07C5, P07C6 (Intermediate shaft speed sensor circuit) P0335, P0337, P0338 (Crankshaft Position Sensor "A" circuit) (This condition applies only if using fail-safe) P0748 (Shift solenoid valve SL1 circuit) P0778 (Shift solenoid valve SL2 circuit) P0798 (Shift solenoid valve SL3 circuit) P2810 (Shift solenoid valve SL4 circuit) P2819 (Shift solenoid valve SL5 circuit) P0973, P0974 (Shift solenoid valve S1 circuit) P0115, P0117, P0118 (ECT sensor circuit) P0712, P0713 (ATF temperature sensor circuit (TFT sensor)) P0327, P0328, P032C, P032D, P0332, P0333, P033C, P033D (KCS sensor circuit) P0120, P0121, P0122, P0123, P0220, P0222, P0223, P0604, P0606, P0607, P060A, P060B, P060D, P060E, P0657, P1607, P2102, P2103, P2111, P2112, P2118, P2119, P2135 ((ETCS) Electronic throttle control system) U0100 (CAN communication system) |
NSW switch | "D" and "not R" and "not N" |
Duration time from shifting "N" to "D" | 4 sec. or more |
ATF temperature | -10°C (14°F) or more |
Engine | Starting |
Fail-safe does not active due to following malfunctions: | |
Shift solenoid valve SL1 | Not OFF or ON malfunction (P0746) |
Shift solenoid valve SL2 | Not OFF or ON malfunction (P0776) |
Shift solenoid valve SL3 | Not OFF or ON malfunction (P0796) |
Shift solenoid valve SL4 | Not OFF or ON malfunction (P2808) |
Shift solenoid valve SL5 | Not OFF or ON malfunction (P2817) |
Shift solenoid valve S1 | Not OFF or ON malfunction (P0751, P0752) |
TCM selected gear | 1st |
Vehicle speed | 3 km/h (1.87 mph) or more and less than 38 km/h (23.75 mph) |
Engine speed - Turbine speed | 150 rpm or more |
Calculated load value | 7.75% or more |
ECT | 40°C (104°F) or more |
Spark advance from MAX. retard timing by KCS control | 0 °CA or more |
TCM indicated S1 solenoid | ON |
TCM indicated pressure value of SL3 | 300 kPa (3.1 kgf/cm2, 44 psi) or more |
Time after end of brake pressure control | 0.2 sec. or more |
TYPICAL MALFUNCTION THRESHOLDS
When either condition below is met: (a) or (b) | |
(a) Turbine speed/Output speed (NT/NO) | 1.712 or more and 1.962 or less (When Output speed less than 400 rpm) |
(b) Turbine speed - Output speed x 3rd gear ratio | -50 rpm or more and 50 rpm or less (When Output speed 400 rpm or more) |
CONFIRMATION DRIVING PATTERN
CAUTION:
When performing the confirmation driving pattern, obey all speed limits and traffic laws.
HINT:
Click here
Click here
HINT:
[*1] : Normal judgment procedure.
The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.
Techstream Display | Description |
---|---|
NORMAL |
|
ABNORMAL |
|
INCOMPLETE |
|
N/A |
|
HINT:
CAUTION / NOTICE / HINT
NOTICE:
Click here
Click here
PROCEDURE
1. | CHECK DTC OUTPUT (IN ADDITION TO DTC P07507F AND P28077F) |
(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 / Transmission / Trouble Codes.
Powertrain > Transmission > Trouble Codes(e) Read the DTCs using the Techstream.
Result | Proceed to |
---|---|
DTC P07507F and P28077F are output | A |
DTCs other than P07507F and P28077F are also output | B |
HINT:
B | GO TO DTC CHART |
|
2. | INSPECT SHIFT SOLENOID VALVE S1 |
(a) Remove the shift solenoid valve S1. Click here |
|
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection | Condition | Specified Condition |
---|---|---|
Shift solenoid valve S1 connector terminal - Shift solenoid valve S1 body | 20°C (68°F) | 11 to 15 Ω |
(c) Connect a positive (+) lead from the battery to the terminal of the solenoid valve connector, and a negative (-) lead to the solenoid body. Check that the valve moves and makes an operating sound.
OK:
Valve moves and makes an operating sound.
NG | REPLACE SHIFT SOLENOID VALVE S1 |
|
3. | INSPECT SHIFT SOLENOID VALVE SL4 |
(a) Remove the shift solenoid valve SL4. Click here |
|
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection | Condition | Specified Condition |
---|---|---|
Shift solenoid valve SL4 connector terminal 1 - terminal 2 | 20°C (68°F) | 5.0 to 5.6 Ω |
(c) Connect a positive (+) lead from the battery to terminal 1 and a negative (-) lead with a 21 W bulb to terminal 2 of the solenoid valve connector. Check that the valve moves and makes an operating sound.
OK:
Valve moves and makes an operating sound.
NG | REPLACE SHIFT SOLENOID VALVE SL4 |
|
4. | INSPECT TRANSMISSION VALVE BODY ASSEMBLY |
(a) Inspect the transmission valve body assembly.
Click here
OK:
There is no foreign matter on each valve and they operate smoothly.
NG | REPAIR OR REPLACE TRANSMISSION VALVE BODY ASSEMBLY |
|
5. | INSPECT TORQUE CONVERTER ASSEMBLY |
(a) Inspect the torque converter assembly.
Click here
OK:
The torque converter assembly is normal.
NG | REPAIR OR REPLACE TORQUE CONVERTER ASSEMBLY |
|
6. | REPAIR OR REPLACE AUTOMATIC TRANSAXLE ASSEMBLY |
(a) Repair or replace the automatic transaxle assembly.
Click here
NEXT | PERFORM A/T CODE REGISTRATION |
Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual > Power Window Control System: Front Passenger Side Power Window Auto Up / Down Function does not Operate with Front Passenger Side Power Window Switch
DESCRIPTION If the manual up and down functions operate normally but the auto up and down functions do not, the power window control system may be in fail-safe mode. If power window initialization has not been performed, the auto up and down functions will not operate. Click here WIRING DIAGRAM C ...
Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual > Seat Belt Warning System: Rear Seat Belt Warning Light Malfunction
DESCRIPTION The main body ECU (multiplex network body ECU) detects whether either rear door is open or closed based on the condition of the left and right courtesy light switches and then sends the rear door status signal to the combination meter assembly. The combination meter assembly detects the ...