P0746

AA80E AUTOMATIC TRANSMISSION: AUTOMATIC TRANSMISSION SYSTEM: P0746: Pressure Control Solenoid "A" Performance (Shift Solenoid Valve SL1)

DTC P0746 - Pressure Control Solenoid "A" Performance (Shift Solenoid Valve SL1)

SYSTEM DESCRIPTION

The TCM detects gear position based on signals from the speed sensors (SP2 and NT).
Based on the detected gear position and oil pressure switch output, 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 SL1:





- *1: When the vehicle is running with the transmission in a gear less than 6th
- *2: When the vehicle is running with the transmission in 6th gear or higher
- *3: 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)





OFF malfunction (F)





ON malfunction (A)





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)






ON malfunction (D)





- 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 both conditions below are met: OFF malfunction (A) and OFF malfunction (B), (C), (D), (E), (F) or (G)

OFF malfunction (A)





OFF malfunction (B)





OFF malfunction (C)





OFF malfunction (D)





OFF malfunction (E)





OFF malfunction (F)





OFF malfunction (G)






ON malfunction
- When both conditions below are met: ON malfunction (A) and ON malfunction (B), (C) or (D)
2 detections are necessary per driving cycle:
1st detection: temporary flag ON
2nd detection: pending fault code ON

ON malfunction (A)






INSPECTION PROCEDURE

PROCEDURE

1. CHECK DTC OUTPUT (IN ADDITION TO DTC P0746, P0873 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 P0746, P0873 and P2714 are output, perform troubleshooting for those DTCs first.

C -- GO TO DTC CHART
B -- GO TO DTC P0873 FLOWCHART
A -- Continue to next step.

2. 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 at a low speed and perform the inspection.
Result:






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

3. INSPECT SHIFT SOLENOID VALVE SL1




(a) Remove the shift solenoid valve SL1 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.
Result:






B -- INSPECT TRANSMISSION VALVE BODY ASSEMBLY
A -- REPLACE SHIFT SOLENOID VALVE SL1
4. INSPECT SHIFT SOLENOID VALVE SLT




(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.

5. 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.

6. 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