Dtc P0766 Shift Solenoid D Performance (Shift Solenoid Valve S4)

Drivetrain. Corolla. Zre142 Aze141
U250E Automatic Transmission Transaxle. Corolla. Zre142 Aze141

SYSTEM DESCRIPTION

MONITOR DESCRIPTION

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

TYPICAL MALFUNCTION THRESHOLDS

INSPECTION PROCEDURE

CHECK OTHER DTCS OUTPUT (IN ADDITION TO DTC P0766)

INSPECT SHIFT SOLENOID VALVE S4

INSPECT TRANSMISSION VALVE BODY ASSEMBLY

INSPECT TORQUE CONVERTER ASSEMBLY

DTC P0766 Shift Solenoid "D" Performance (Shift Solenoid Valve S4)


SYSTEM DESCRIPTION

The ECM uses signals from the vehicle 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 transaxle (clutch, brake or gear etc.).

DTC No.
DTC Detecting Condition
Trouble Area
P0766
The gear required by the ECM does not match the actual gear when driving (2-trip detection logic)
  1. Shift solenoid valve S4 remains open or closed
  2. Valve body is blocked
  3. Automatic transaxle (clutch, brake or gear etc.)

MONITOR DESCRIPTION

The ECM commands gear shifts by turning the shift solenoid valves "ON/OFF". According to the input shaft revolution, intermediate (counter) shaft revolution and output shaft revolution, the ECM detects the actual gear position (1st, 2nd, 3rd, 4th or 5th gear position). 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.

MONITOR STRATEGY


Related DTCs
P0766:
Shift solenoid valve S4/OFF malfunction
Shift solenoid valve S4/ON malfunction
Required sensors/Components
Shift solenoid valve S4, Speed sensor (NT), Speed sensor (NC), Crankshaft position sensor (NE)
Frequency of operation
Continuous
Duration
OFF malfunction (A) and ON malfunction (B)
1 sec.
OFF malfunction (B)
1.2 sec.
ON malfunction (A)
0.8 sec.
MIL operation
2 driving cycles
Sequence of operation
None

TYPICAL ENABLING CONDITIONS


All:
The monitor will run whenever this DTC is not present.
(Not circuit malfunction)
P0712, P0713 (ATF temperature sensor circuit)
P0115, P0117, P0118 (ECT sensor circuit)
P0717 (Turbine speed sensor circuit)
P0793 (Intermediate shaft speed sensor circuit)
P0500 (Vehicle speed sensor circuit)
P0748 (Shift solenoid valve SL1 circuit)
P0778 (Shift solenoid valve SL2 circuit)
P0798 (Shift solenoid valve SL3 circuit)
P0982, P0983 (Shift solenoid valve S4 circuit)
P0985, P0986 (Shift solenoid valve SR circuit)
P2769, P2770 (Shift solenoid valve DSL circuit)
P0120, P0121, P0122, P0123, P0220, P0222, P0223, P0604, P0606, P0607, P060A, P060D, P060E, P0657, P1607, P2102, P2103, P2111, P2112, P2118, P2119, P2135 (Electronic throttle system)
ECT (Engine coolant temperature)
10°C (50°F) or more
Transmission range
"D"
TFT (Transmission fluid temperature)
-20°C (-4°F) or more

OFF malfunction (A):
ECM selected gear
5th
Throttle valve opening angle
5% or more
Vehicle speed
10 km/h (6 mph) or more

OFF malfunction (B):
ECM lock-up command
ON
ECM selected gear
3rd, 4th or 5th
Throttle valve opening angle
10% or more
Vehicle speed
3rd
25 to 100 km/h (16 to 62 mph)
4th, 5th
25 to 120 km/h (16 to 75 mph)

ON malfunction (A):
ECM selected gear
4th or 5th
Throttle valve opening angle
4.5% or more at engine speed 1,900 rpm
(Varies with engine speed)

ON malfunction (B):
ECM selected gear
4th
Throttle valve opening angle
5% or more
Vehicle speed
10 km/h (6 mph) or more

TYPICAL MALFUNCTION THRESHOLDS

Either of the following conditions is met: OFF malfunction (A) and (B), or ON malfunction (A) and (B)
  1. 2 detections are necessary per driving cycle:
    1st detection; temporary flag ON
    2nd detection; pending fault code ON

    OFF malfunction (A):
    Intermediate shaft speed/Output speed
    		1.34 to 1.48

    OFF malfunction (B):
    Difference between engine speed and input (turbine) speed
    		Less than 35 rpm

    ON malfunction (A):
    Input (turbine) speed/Intermediate shaft speed
    		0.64 to 0.74

    ON malfunction (B):
    Intermediate shaft speed/Output speed
    		0.95 to 1.09

INSPECTION PROCEDURE

NOTICE:
Perform the universal trip to clear permanent DTCs (COROLLA_ZRE142 RM000000W770S6X.html).
HINT:
Using Techstream to perform Active Test allows relays, VSVs, actuators and other items to be operated without removing any parts. This non-intrusive functional inspection can be very useful because intermittent operation may be discovered before parts or wiring is disturbed. Performing Active Test early in troubleshooting is one way to save diagnostic time. Data List information can be displayed while performing Active Test.

PERFORM ACTIVE TEST

  1. Warm up the engine.

  2. Turn the ignition switch off.

  3. Connect Techstream to the DLC3.

  4. Turn the ignition switch to the on position.

  5. Turn on the tester.

  6. Select the item "Powertrain / Engine and ECT / Active Test / Shift Status".

  7. According to the display on the tester, perform the "Active Test".

    HINT:
    While driving, the shift position can be forcibly changed with Techstream.
    Comparing the shift position commanded by the Active Test with the actual shift position enables you to confirm the problem (COROLLA_ZRE142 RM000000O8L0N2X.html).

    Tester Display
    		Test Part
    		Control Range
    		Diagnostic Note
    Control the Shift Position
    		[Test Details]
    Operate the shift solenoid valve and set each shift position by yourself.
    [Vehicle Condition]
    1. IDL: ON
    2. Less than 50 km/h (31 mph)
    [Others]
    1. Press "→" button: Shift up
    2. Press "←" button: Shift down
    		1st/2nd/3rd/4th/5th
    		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 shift position commanded by the ECM is shown in the Data List / Shift Status display on Techstream.
1.CHECK OTHER DTCS OUTPUT (IN ADDITION TO DTC P0766)

  1. Connect Techstream to the DLC3.

  1. Turn the ignition switch to the on position and turn the Techstream main switch ON.

  1. When you use Techstream:
    Select the item "Powertrain / Engine and ECT / Trouble Codes".

  1. Read the DTCs using Techstream.

    Result:

    Display (DTC output)
    		Proceed to
    Only "P0766" is output
    		A
    "P0766" and other DTCs
    		B
    HINT:
    If any other codes besides "P0766" are output, perform the troubleshooting for those DTCs first.


B
GO TO DTC CHART (COROLLA_ZRE142 RM000000W710LJX.html)
A


2.INSPECT SHIFT SOLENOID VALVE S4


    Corolla. Zre142 Aze141.U250E Automatic Transmission Transaxle.Automatic Transaxle System. Dtc P0766 Shift Solenoid D Performance (Shift Solenoid Valve S4)

  1. Remove the shift solenoid valve S4.

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

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    Solenoid Connector (S4) - Solenoid Body (S4)
    		20°C (68°F)
    		11 to 15 Ω

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

    OK:
    The solenoid makes an operating sound.


NG
REPLACE SHIFT SOLENOID VALVE S4 (COROLLA_ZRE142 RM00000109S01BX.html)
OK


3.INSPECT TRANSMISSION VALVE BODY ASSEMBLY
OK:
There are no foreign objects on each valve and they operate smoothly.


NG
REPAIR OR REPLACE TRANSMISSION VALVE BODY ASSEMBLY (COROLLA_ZRE142 RM000000YWX02NX.html)
OK


4.INSPECT TORQUE CONVERTER ASSEMBLY
OK:
The torque converter assembly operates normally.


NG
REPLACE TORQUE CONVERTER ASSEMBLY
OK

REPAIR OR REPLACE AUTOMATIC TRANSAXLE ASSEMBLY (COROLLA_ZRE142 RM000000YWV032X.html)