DTC    P0771    Shift Solenoid "E" Performance (Shift Solenoid Valve SR)

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
P0771
  1. S1 stuck ON malfunction:
    The ECM determines there is a malfunction when the following conditions are both met (2 trip detection logic)
    1. When the ECM directs the gear shift to switch to 1st gear, the actual gear is shifted to 2nd.
    2. When the ECM directs the gear shift to switch to 5th gear, the actual gear is also shifted to 5th.
  1. Shift solenoid valve SR remains open
  2. Shift solenoid valve SL1 remains open
  3. Valve body is blocked
  4. 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 SR and SL1.
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 SR and SL1 turns ON/OFF normally when the shift lever is on D:

    ECM gear shift command
    		1st
    		2nd
    		3rd
    		4th
    		5th
    Shift solenoid valve SR
    		OFF
    		OFF
    		OFF
    		OFF
    		ON
    Shift solenoid valve SL1
    		OFF
    		OFF
    		OFF
    		OFF
    		ON

1.CHECK OTHER DTCS OUTPUT (IN ADDITION TO DTC P0771)

  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 P0771 is output
    		A
    P0771 and other DTCs
    		B

    HINT:
    If any other codes besides P0771 are output, perform troubleshooting for those DTCs first.



B
GO TO DTC CHART
A


2.INSPECT SHIFT SOLENOID VALVE SR


    A110988E01

  1. Remove the shift solenoid valve SR.

  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 SR
OK


3.INSPECT SHIFT SOLENOID VALVE SL1
D025466E03

  1. Remove the shift solenoid valve SL1.

  1. Measure the resistance of the solenoid valve.

    Standard resistance:
    5.0 to 5.6 Ωat 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 operating noise.



NG
REPLACE SHIFT SOLENOID VALVE SL1
OK


4.INSPECT TRANSMISSION VALVE BODY ASSEMBLY

OK:
There are no foreign objects on each valve.



NG
REPAIR OR REPLACE TRANSMISSION VALVE BODY ASSEMBLY
OK

REPLACE TRANSMISSION VALVE BODY ASSEMBLY