DTC    P0751    Shift Solenoid "A" Performance (Shift Solenoid Valve S1)

for Preparation Click here


DESCRIPTION

The ECM uses signals from the output shaft speed sensor and input speed sensor to detect the actual gear position (1st, 2nd, 3rd, 4th or 5th gear).
Then the ECM compares the actual gear with the shift schedule in the ECM memory to detect mechanical problems of the shift solenoid valves, valve body or automatic transmission (clutch, brake or gear, etc.).

DTC No.
DTC Detection Condition
Trouble Area
P0751
Gear required by the ECM does not match the actual gear when driving (2 trip detection logic)
  1. Shift solenoid valve S1 remains open or closed
  2. Valve body is blocked
  3. Automatic transmission (clutch, brake or gear, etc.)

MONITOR DESCRIPTION

This DTC indicates a stuck ON malfunction or stuck OFF malfunction of the shift solenoid valve S1.
The ECM commands gear shifts by turning the shift solenoid valves ON/OFF. When the gear position commanded by the ECM and the actual gear position are not the same, the ECM illuminates the MIL and stores the DTC.

INSPECTION PROCEDURE

HINT:
Performing the intelligent tester's Active Test allows relay, Vacuum Switching Valve (VSV), actuator and other item values to be operated without removing any parts. Performing the Active Test early in troubleshooting is one way to save time. The Data List can be displayed during the Active Test.

  1. Warm up the engine.
  2. Turn the ignition switch OFF.
  3. Connect the intelligent tester to the DLC3.
  4. Turn the ignition switch ON and push the tester main switch ON.
  5. Enter the following menus: Powertrain / Engine and ECT / Active Test.
  6. Follow the instructions on the tester and read the Active Test.

HINT:
While driving, the shift position can be forcibly changed with the intelligent tester.
Comparing the shift position commanded by the Active Test with the actual shift position enables you to confirm the problem (Click here).


Item
Test Details
Diagnostic Note
Control the Shift Position
[Test Details]
Operate the shift solenoid valve and set each shift position by yourself
[Vehicle Condition]
50 km/h (31 mph) or less
[Other information]
  1. Press "→" button: Shift up
  2. Press "←" button: Shift down
Possible to check the operation of the shift solenoid valves

HINT:
  1. This test can be conducted when the vehicle speed is 50 km/h (31 mph) or less.
  2. The 4th to 5th up-shift must be performed with the accelerator pedal released.
  3. The 5th to 4th down-shift must be performed with the accelerator pedal released.
  4. Do not operate the accelerator pedal for at least 2 seconds after shifting and do not shift successively.
  5. The shift position commanded by the ECM is shown in the Data List (shift status) display on the intelligent tester.
  6. The shift solenoid valve S1 turns ON/OFF normally when the shift lever is on D:

    ECM gear shift command
    		1st
    		2nd
    		3rd
    		4th
    		5th
    Shift solenoid valve S1
    		ON
    		ON
    		OFF
    		OFF
    		OFF

1.CHECK OTHER DTCS OUTPUT (IN ADDITION TO DTC P0751)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch ON and push the intelligent tester main switch ON.

  1. Enter the following menus: Powertrain / Engine and ECT / DTC / Current or Pending.

  1. Read the DTCs using the intelligent tester.

    Result:
    Display (DTC output)
    		Proceed to
    Only P0751 is output
    		A
    P0751 and other DTCs
    		B

    HINT:
    If any other codes besides P0751 are output, perform troubleshooting for those DTCs first.



B
GO TO DTC CHART
A


2.INSPECT SHIFT SOLENOID VALVE S1


    A110986E01

  1. Remove the shift solenoid valve S1.

  1. Measure the resistance between the solenoid valve terminal and solenoid valve body.

    Standard resistance:
    11 to 15 Ω at 20°C (68°F)

  1. Connect the battery's positive (+) lead to the terminal of the solenoid connector, and the negative (-) lead to the solenoid body.

    OK:
    Solenoid makes an operating noise.



NG
REPLACE SHIFT SOLENOID VALVE S1
OK


3.INSPECT TRANSMISSION VALVE BODY ASSEMBLY

OK:
There are no foreign objects on each valve.



NG
REPAIR OR REPLACE TRANSMISSION VALVE BODY ASSEMBLY
OK

REPLACE AUTOMATIC TRANSMISSION ASSEMBLY