P0766
TX6A AUTOMATIC TRANSMISSION / TRANSAXLE: AUTOMATIC TRANSMISSION SYSTEM: P0766, P0767, P0776; Shift Solenoid "D" Performance (Shift Solenoid Valve S4); 2013 MY FR-S [03/2012 -]
P0766 - Shift Solenoid "D" Performance (Shift Solenoid Valve S4)
P0767 - Shift Solenoid "D" Stuck ON (S4 Solenoid)
P0776 - Pressure Control Solenoid "B" Performance (Shift Solenoid Valve SL2)
DESCRIPTION
The TCM carries out detection of the gear position based upon signals from the transmission revolution sensor (NT) and the transmission revolution sensor (SP2). Subsequently, if the gear position as detected by the TCM is different to the commanded gear position, then a related solenoid valve, valve body, or automatic transmission mechanical problem is detected.
HINT
* Gear positions in the event of a solenoid valve mechanical problem:
* Gear positions in the event of a shift solenoid valve S4 ON stuck with M position:
* Gear position during fail-safe operation:
If any malfunction is detected, the TCM changes into the fail-safe mode to shift into the gear positions as shown in the table below.
MONITOR DESCRIPTION
This DTC indicates "stuck OFF malfunction" of the shift solenoid valve S4, "stuck ON malfunction" of the shift solenoid valve SL2, or brake control valve malfunction. The TCM commands gear shifts by turning the shift solenoid valves "ON/OFF". When the gear position commanded by the TCM and the actual gear position are not same, the TCM illuminates the MIL and stores the DTC.
MONITOR STRATEGY
TYPICAL ENABLING CONDITIONS
The following items are common to all conditions below.
TYPICAL MALFUNCTION THRESHOLDS
P0766: Shift Solenoid 4 (OFF Stuck)
* Compare target gear instructed from TCM and gear ratio calculated from turbine shaft speed and vehicle speed.
Both of the following condition are met: Condition (A) and (B)
Condition (A)
*
Condition (B)
* Both of the following condition are met: Condition (C) and (D)
Condition (C)
*
Condition (D)
P0767: Shift Solenoid 4 (ON Stuck)
* Compare target gear instructed from TCM and gear ratio calculated from turbine shaft speed and vehicle speed.
* Both of the following condition are met: Condition (A) and (B)
Condition (A)
*
Condition (B)
P0776: Linear Solenoid 2 (ON Stuck)
* Compare target gear instructed from TCM and gear ratio calculated from turbine shaft speed and vehicle speed.
Both of the following condition are met: Condition (A) and (B)
Condition (A)
*
Condition (B)
* Both of the following condition are met: Condition (C) and (D)
Condition (C)
*
Condition (D)
WIRING DIAGRAM
INSPECTION PROCEDURE
NOTICE:
Perform the universal trip to clear permanent DTCs Reading and Clearing Diagnostic Trouble Codes.
1. CHECK THE SHIFT POSITION
(a) Drive the vehicle with shift lever in the M.
(b) Check the shift position.
HINT
* Gear positions when the shift solenoid valve S4 is stuck OFF, or shift solenoid valve SL2 is malfunctioning (Shift lever in M):
* Gear positions when the shift solenoid valve S4 is stuck ON (Shift lever in M):
PROCEDURE
1. CHECK OTHER DTCS OUTPUT
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON and push the Techstream main switch ON.
(c) Read the DTCs using the Techstream Reading and Clearing Diagnostic Trouble Codes.
Result:
B -- GO TO DTC CHART TX6A Automatic Transmission
A -- Continue to next step.
2. HYDRAULIC TEST
NOTICE:
* Perform the test at the normal operating ATF (Automatic Transmission Fluid) temperature: 60 to 90°C (140 to 194°F)
* The line pressure test should always be carried out in pairs. One technician should observe the conditions of wheels or wheel stoppers outside the vehicle while the other is performing the test.
* 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.
* When conducting stall test, do not continue more than 5 seconds.
(a) Warm up the ATF (Automatic Transmission Fluid).
(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 check the 4 wheels.
(f) Connect the Techstream to the DLC3.
(g) Turn the ignition switch to ON and turn the Techstream on.
(h) Enter the following menus: Powertrain / ECT / Data List / Engine Speed.
(i) Start the engine and check idling speed.
(j) Keep your left foot pressing firmly on the brake pedal and shift into D position.
(k) Measure the line pressure when the engine is idling.
(l) Depress the accelerator pedal all the way down. Quickly read the highest line pressure when engine speed reaches stall speed.
(m) In the same manner, do the test in R position.
Specified line pressure:
NG -- REPLACE TRANSMISSION VALVE BODY ASSEMBLY Removal
OK -- Continue to next step.
3. INSPECT SHIFT SOLENOID VALVE S4
(a) Remove the shift solenoid valve S4 Removal.
(b) Perform inspection of the shift solenoid valve S4 Testing and Inspection.
NG -- REPLACE SHIFT SOLENOID VALVE S4 Removal
OK -- Continue to next step.
4. INSPECT SHIFT SOLENOID VALVE SL2 (TRANSMISSION VALVE BODY ASSEMBLY)
(a) Remove the transmission valve body assembly Removal.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
(c) Connect the positive (+) lead with a 21 W bulb to terminal 1 and the negative (-) lead to terminal 2 of the shift solenoid valve connector, then check the movement of the valve.
OK:
The solenoid makes an operating sound.
NG -- REPLACE TRANSMISSION VALVE BODY ASSEMBLY Removal
OK -- Continue to next step.
5. INSPECT TRANSMISSION VALVE BODY ASSEMBLY
(a) Check the transmission valve body assembly Testing and Inspection.
OK:
There are no foreign objects on each valve.
NG -- REPAIR OR REPLACE TRANSMISSION VALVE BODY ASSEMBLY Removal
OK -- REPLACE AUTOMATIC TRANSMISSION ASSEMBLY Removal