P0761

A760H AUTOMATIC TRANSMISSION: AUTOMATIC TRANSMISSION SYSTEM: P0761: Shift Solenoid "C" Performance (Shift Solenoid Valve S3)

DTC P0761 - Shift Solenoid "C" Performance (Shift Solenoid Valve S3)

SYSTEM 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, 5th or 6th 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.).





HINT:
- Gear positions in the event of a solenoid valve mechanical problem:






N*: Neutral
- Gear position during fail-safe operation:
If any malfunction is detected, the ECM changes into the fail-safe mode to shift into the gear positions as shown in the table below.






MONITOR DESCRIPTION

This DTC indicates "stuck ON malfunction" or "stuck OFF malfunction" of the shift solenoid valve S3.
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 same, the ECM illuminates the MIL and stores the DTC.

MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS

The following items are common to all conditions below.





OFF malfunction (A)





OFF malfunction (B)





ON malfunction (A)





ON malfunction (B)





ON malfunction (C)





TYPICAL MALFUNCTION THRESHOLDS

[OFF malfunction]
Both of the following condition are met: OFF malfunctions (A) and (B)

OFF malfunction (A)





OFF malfunction (B)





[ON malfunction]
One of the following conditions is met: ON malfunctions (A), (B) or (C)

ON malfunction (A)





ON malfunction (B)





ON malfunction (C)





INSPECTION PROCEDURE

1. ACTIVE TEST
HINT:
Using the 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.

(a) Warm up the engine.
(b) Turn the engine switch off.
(c) Connect the Techstream to the DLC3.
(d) Turn the engine switch on (IG) position.
(e) Turn the Techstream on.
(f) Select the item "Powertrain / Engine and ECT / Active Test".
(g) According to the display on tester, perform the "Active Test".
HINT:
While driving, the shift position can be forcibly changed with the Techstream.
Comparing the shift position commanded by the Active Test with the actual shift position enables you to confirm the problem Fail-Safe Chart.





HINT:
- This test can be conducted when the vehicle speed is 50 km/h (31 mph) or less.
- The 4th to 5th and 5th to 6th up-shiftings must be performed with the accelerator pedal released.
- The 6th to 5th and 5th to 4th down-shiftings must be performed with the accelerator pedal released.
- Do not operate the accelerator pedal for at least 2 seconds after shifting and do not shift successively.
- The shift position commanded by the ECM is shown in the Data List (Shift Status) display on the Techstream.
- The shift solenoid valve S3 is turned on/off normally when the shift lever is in the D position:






PROCEDURE

1. CHECK OTHER DTCS OUTPUT (IN ADDITION TO DTC P0761)
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG) position and push the Techstream main switch ON.
(c) When you use Techstream:
Select the item "Powertrain / Engine and ECT / Trouble Codes".
(d) Read the DTCs using the Techstream.
Result:





HINT:
If any other codes besides "P0761" are output, perform troubleshooting for those DTCs first.

B -- GO TO DTC CHART
A -- Continue to next step.
2. PERFORM ACTIVE TEST USING TECHSTREAM (SHIFT SOLENOID VALVE SLT)
NOTICE:
- Perform the test at the normal operating ATF (Automatic Transmission Fluid) temperature: 50 to 80°C (122 to 176°F)
- Be careful to prevent SST hose from interfering with the exhaust pipe.
- This check must be conducted after checking and adjusting engine.
- Perform under condition that A/C is OFF.
HINT:
Using the 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.
(a) Turn the engine switch off.
(b) Lift the vehicle up.




(c) Remove the test plug on the transmission case center right side and connect SST.
SST: 09992-00095
09992-00231
09992-00271
(d) Lower the vehicle.
(e) Fully apply the parking brake and chock the 4 wheels.
(f) Connect the Techstream to the DLC3.
(g) Start the engine.
(h) Warm up the ATF (Automatic Transmission Fluid).
(i) Measure the line pressure when the engine is idling.
(j) Turn the Techstream on.
(k) Select the item "Powertrain / Engine and ECT / Active Test".
(l) According to the display on tester, perform the "Active Test".
(m) Measure the line pressure with SST.





*: "Activate the Solenoid (SLT)" in the Active Test is performed to check the line pressure changes by connecting the SST to the automatic transmission, which is used in the HYDRAULIC TEST Hydraulic Test as well.
HINT:
The pressure values in Active Test and HYDRAULIC TEST are different from each other.

OK:
The line pressure changes as specified when performing the Active Test.
NG -- REPLACE SHIFT SOLENOID VALVE SLT
OK -- Continue to next step.
3. INSPECT SHIFT SOLENOID VALVE S3




(a) Remove the shift solenoid valve S3.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:





(c) 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 S3
OK -- Continue to next step.
4. INSPECT TRANSMISSION VALVE BODY ASSEMBLY
OK:
There are no foreign objects on each valve.
NG -- REPLACE TRANSMISSION VALVE BODY ASSEMBLY
OK -- REPAIR OR REPLACE AUTOMATIC TRANSMISSION ASSEMBLY