AA80E Automatic Transmission: Automatic Transmission System

AA80E AUTOMATIC TRANSMISSION: AUTOMATIC TRANSMISSION SYSTEM: P0776: Pressure Control Solenoid "B" Performance (Shift Solenoid Valve SL2)

DTC P0776 - Pressure Control Solenoid "B" Performance (Shift Solenoid Valve SL2)

SYSTEM DESCRIPTION

Based on signals from the transmission speed sensors (NT, SP2 and NC3), gear position is detected.
If the detected gear position is different than the commanded gear position, the TCM detects related mechanical problems in the shift solenoid valves, valve body and automatic transmission.
HINT: Gear shift position when a problem occurs in shift solenoid valve SL2:

*: Neutral

MONITOR DESCRIPTION

The TCM commands gear shifts by turning the shift solenoid valves on or off. According to the input shaft revolution, intermediate (counter) shaft revolution and output shaft revolution, the TCM detects the actual gear position (1st, 2nd, 3rd, 4th, 5th, 6th, 7th or 8th gear position). When the gear position commanded by the TCM and the actual gear position are not the same, the TCM illuminates the MIL.

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

All

OFF malfunction (A)

OFF malfunction (B)

OFF malfunction (C)

OFF malfunction (D)

OFF malfunction (E)

ON malfunction (A)

- When either condition below is met: Condition (1) or (2)

Condition (1)

When one of the following conditions is met: Condition (a), (b), (c), (d), (e), (f), (g) or (h)

Condition (a)

Condition (b)

Condition (c)

Condition (d)

Condition (e)

Condition (f)

Condition (g)

Condition (h)

ON malfunction (B)

- When either condition below is met: Condition (1) or (2)

Condition (1)

When one of the following conditions is met: Condition (a), (b), (c), (d), (e), (f), (g) or (h)

Condition (a)

Condition (b)

Condition (c)

Condition (d)

Condition (e)

Condition (f)

Condition (g)

Condition (h)

ON malfunction (C)

- When either condition below is met: Condition (1) or (2)

Condition (1)

When one of the following conditions is met: Condition (a), (b), (c), (d), (e), (f), (g) or (h)

Condition (a)

Condition (b)

Condition (c)

Condition (d)

Condition (e)

Condition (f)

Condition (g)

Condition (h)

TYPICAL MALFUNCTION THRESHOLDS

OFF malfunction
- When one of following conditions is met: OFF malfunction (A), (B), (C), (D) or (E)

OFF malfunction (A)

OFF malfunction (B)

OFF malfunction (C)

OFF malfunction (D)

OFF malfunction (E)

ON malfunction
- When one of following conditions is met: ON malfunction (A), (B) or (C)
2 detections are necessary per driving cycle:
1st detection: temporary flag ON
2nd detection: pending fault code ON

ON malfunction (A)

When either condition below is met: Condition (1) or (2)

Condition (1)

Condition (2)

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1. CHECK DTC OUTPUT (IN ADDITION TO DTC P0771, P0776 AND P2714)
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG).
(c) Turn the Techstream on.
(d) Enter the following menus: Powertrain / ECT / Trouble Codes.
(e) Read the DTCs using the Techstream.
Result:

HINT: If any other codes besides P0771, P0776 and P2714 are output, perform troubleshooting for those DTCs first.

C -- GO TO DTC CHART
B -- INSPECT SHIFT SOLENOID VALVE SL2
A -- Continue to next step.

2. CLEAR DTC AND PERFORM STALL SPEED TEST
(a) Clear the DTCs DTC Check / Clear.
HINT: Write down the currently output DTCs before clearing them.
(b) Perform the stall speed test Mechanical System Tests.
Result:

B -- INSPECT SHIFT SOLENOID VALVE SLT
A -- Continue to next step.

3. CLEAR DTC AND PERFORM RUNNING TEST
(a) Clear the DTCs DTC Check / Clear.
HINT: Write down the currently output DTCs before clearing them.
(b) Start the engine, drive the vehicle and perform the inspection.
Result:

HINT: *: If the gear is shifted to 5th gear or above, gear shifts will no longer be able to be performed. When performing the test again, first clear the DTCs.

C -- INSPECT SPEED SENSOR TERMINAL (NC3 TERMINAL)
B -- INSPECT SHIFT SOLENOID VALVE SL2
A -- Continue to next step.

4. INSPECT SHIFT SOLENOID VALVE SR

(a) Remove the shift solenoid valve SR Disassembly.
(b) Measure the resistance of the shift solenoid valve.
Standard resistance:

(c) Connect the battery's positive (+) lead to the terminal of the solenoid valve connector, and the negative (-) lead to the solenoid body. Then check that the valve moves and makes an operating sound.
OK:
Valve moves and makes operating sound.
OK -- INSPECT TRANSMISSION VALVE BODY ASSEMBLY
NG -- REPLACE SHIFT SOLENOID VALVE SR
5. INSPECT SHIFT SOLENOID VALVE SL2

(a) Remove the shift solenoid valve SL2 Disassembly.
(b) Measure the resistance of the shift solenoid valve.
Standard resistance:

(a) Remove the shift solenoid valve SLT Disassembly.
(b) Measure the resistance of the shift solenoid valve.
Standard resistance:

(c) Connect the battery's positive (+) lead with a 21 W bulb to terminal 2 and the negative (-) lead to terminal 1 of the solenoid valve connector. Then check that the valve moves and makes an operating sound.
OK:
Valve moves and makes operating sound.
NG -- REPLACE SHIFT SOLENOID VALVE SLT
OK -- Continue to next step.

7. INSPECT TRANSMISSION VALVE BODY ASSEMBLY
(a) Check the transmission valve body assembly Disassembly.
OK:
There are no foreign objects on any valve.
NG -- REPAIR OR REPLACE TRANSMISSION VALVE BODY ASSEMBLY
OK -- Continue to next step.

8. INSPECT TORQUE CONVERTER CLUTCH ASSEMBLY
(a) Check the torque converter clutch assembly AA80E Automatic Transmission.
OK:
The torque converter clutch operates normally.
NG -- REPLACE TORQUE CONVERTER CLUTCH ASSEMBLY
OK -- REPAIR OR REPLACE AUTOMATIC TRANSMISSION ASSEMBLY
9. INSPECT SPEED SENSOR TERMINAL (NC3 TERMINAL)

(a) Disconnect the transmission wire connector.
(b) Turn the engine switch on (IG).
(c) Measure the voltage of the wire harness side connector.
Standard voltage:

(d) Measure the resistance of the wire harness side connector.
Standard resistance:

NG -- CHECK HARNESS AND CONNECTOR (TRANSMISSION WIRE - TCM)
OK -- Continue to next step.

10. INSPECT TRANSMISSION WIRE (SPEED SENSOR NC3)

(a) Disconnect the speed sensor (NC3) connector.
(b) Disconnect the transmission wire connector.
(c) Measure the resistance of the transmission wire.
Standard resistance:

NG -- REPAIR OR REPLACE TRANSMISSION WIRE
OK -- REPLACE SPEED SENSOR
11. CHECK HARNESS AND CONNECTOR (TRANSMISSION WIRE - TCM)

(a) Disconnect the transmission wire connector.
(b) Disconnect the TCM connector.
(c) Measure the resistance of the wire harness side connectors.
Standard resistance:

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

12. REPLACE TCM
(a) Replace the TCM Removal.
NEXT -- PERFORM A/T CODE REGISTRATION