AA80E Automatic Transmission
AA80E AUTOMATIC TRANSMISSION: AUTOMATIC TRANSMISSION SYSTEM: P0741, P2757: Torque Converter Clutch Solenoid Performance (Shift Solenoid Valve SL)
DESCRIPTION
Based on the on and off signals of the shift solenoid valve SL, the TCM controls the fluid pressure to the lock-up relay valve, and turns lock-up on or off.
MONITOR DESCRIPTION
Torque converter assembly lock-up is controlled by the TCM based on the speed sensor (NT), engine speed, engine load, engine coolant temperature, vehicle speed, transmission fluid temperature, and gear selection. The TCM determines the lock-up status of the torque converter assembly by comparing the engine speed (NE) to the input turbine speed (NT). The TCM calculates the actual transmission gear by comparing the input turbine speed (NT) to the counter gear speed (NC). When conditions are appropriate, the TCM requests "lock-up" by applying control voltage to shift solenoid SL. When shift solenoid SL is turned on, it applies pressure to the lock-up relay valve and locks the torque converter assembly.
If the TCM detects no lock-up after lock-up has been requested, the TCM interprets this as a fault in shift solenoid valve SL or SLU. The TCM will turn on the MIL and store the DTC.
HINT
Example:
When the following condition is met, the system judges it to be a malfunction.
There is a difference in rotation between the input side (engine speed) and output side (input turbine speed) of the torque converter assembly when the TCM commands lock-up (engine speed is at least 70 rpm more than the input turbine speed).
MONITOR STRATEGY
TYPICAL ENABLING CONDITIONS
- 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)
Condition (2)
- When all conditions below are met: Condition (a), (b), (c), (d), (e), (f), (g) and (h)
Condition (a)
Condition (b)
Condition (c)
Condition (d)
Condition (e)
Condition (f)
Condition (g)
Condition (h)
OFF malfunction
TYPICAL MALFUNCTION THRESHOLDS
OFF malfunction
INSPECTION PROCEDURE
NOTICE:
Perform the universal trip to clear permanent DTCs AA80E Automatic Transmission System.
PROCEDURE
1. CHECK DTC OUTPUT (IN ADDITION TO DTC P0741 AND P2757)
(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 a solenoid related or oil pressure switch related DTC is output, troubleshoot those DTCs first.
B -- GO TO DTC CHART Automatic Transmission System - AA80E
A -- Continue to next step.
2. INSPECT SHIFT SOLENOID VALVE SL AND SHIFT SOLENOID VALVE SLU
(a) Check shift solenoid valve SL.
(1) Remove shift solenoid valve SL Disassembly.
(2) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
(3) 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 noise.
OK:
Valve moves and makes operating noise.
(b) Check shift solenoid valve SLU.
(1) Remove shift solenoid valve SLU Disassembly.
(2) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
(3) 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 noise.
OK:
Valve moves and makes operating noise.
Result:
B -- REPLACE SHIFT SOLENOID VALVE SL Disassembly
C -- REPLACE SHIFT SOLENOID VALVE SLU Disassembly
A -- Continue to next step.
3. 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 Removal
OK -- Continue to next step.
4. INSPECT TORQUE CONVERTER ASSEMBLY
(a) Check the torque converter assembly AA80E Automatic Transmission.
OK:
The torque converter assembly operates normally.
NG -- REPLACE TORQUE CONVERTER ASSEMBLY Removal
OK -- REPAIR OR REPLACE AUTOMATIC TRANSMISSION ASSEMBLY Removal