Automatic Transmission (Diagnostics - Introduction) (U341E): Other Toyota Corolla XI

PRECAUTION [08/2013 - ]

Note. Perform Reset Memory (AT initialization) when replacing the automatic transaxle assembly, engine assembly or ECM. Refer to INITIALIZATION [08/2013 - ] Perform Registration (VIN registration) when replacing the ECM. Refer to REGISTRATION [08/2013 - ] When the cable is disconnected from the negative (-) battery terminal, initialize the following system(s) after the cable is reconnected. System Name See Procedure Air Conditioning System (for Automatic Air Conditioning System) Refer to INITIALIZATION [08/2013 - ]

HINT

Reset Memory cannot be completed by only disconnecting the battery cable.

1. EXPRESSIONS OF IGNITION SWITCH The type of ignition switch used on this model differs depending on the specifications of the vehicle. The expressions listed in the table below are used in this article. Expression Ignition Switch (Position) Engine Switch (Condition) Ignition Switch off LOCK Off (Lock) Ignition Switch ACC ACC On (ACC) Ignition Switch ON ON On (IG) Engine Start START On (Start)
2. HANDLING PRECAUTIONS WARNING: When using compressed air, always aim away from yourself to prevent Automatic Transmission Fluid (ATF) or kerosene from spraying on your face. NOTE: The automatic transaxle is composed of precision-made parts. Careful inspection before reassembly is necessary because even a small nick could cause fluid leakage or affect performance. The procedures are organized so that you work on only one component group at a time. This will help avoid confusion with similar-looking parts of different sub-assemblies being on your workbench at the same time. The component groups are inspected and repaired from the converter housing side. Whenever possible, complete the inspection, repair and reassembly before proceeding to the next component group. If a defect is found in a certain component group during reassembly, inspect and repair this group immediately. If a component group cannot be assembled because parts are being ordered, be sure to keep all parts of the group in a separate container while proceeding with disassembly, inspection, repair and reassembly of other component groups. Use of Toyota Genuine ATF WS is recommended. All disassembled parts should be washed clean, and compressed air should be blown through any fluid passages and holes. Dry all parts with compressed air. Never use cloth. The recommended ATF or kerosene should be used for cleaning. After cleaning, the parts should be arranged in the order they were removed for efficient inspection, repair and reassembly. New discs for the brakes and clutches must be soaked in ATF for at least 15 minutes before reassembly. All oil seal rings, clutch discs, clutch plates, rotating parts, and sliding surfaces should be coated with ATF prior to reassembly. All old gaskets and rubber O-rings must be replaced. Do not apply adhesive cement to gaskets or similar parts. Make sure that the ends of snap rings are not aligned with any cutouts. Make sure that snap rings are correctly installed into the grooves. If a worn bushing is to be replaced, the sub-assembly containing the bushing must also be replaced. Check the thrust bearings and races for wear or damage. Replace them if necessary. Use petroleum jelly to keep parts in place. When working with FIPG material, observe the following: Using a razor blade and a gasket scraper, remove all the old seal packing (FIPG) from the gasket surface. Thoroughly clean all components to remove any loose material. Clean both sealing surfaces with a non-residue solvent. Parts must be reassembled within 10 minutes of application. Otherwise, the seal packing (FIPG) must be removed and reapplied.

DEFINITION OF TERMS [08/2013 - ]

Scheme 7

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SYSTEM DIAGRAM [08/2013 - ]

The configuration of the electronic control system in the U341E automatic transaxle is as shown in the following chart.

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CAUTION / NOTICE / HINT

HINT

1. The ECM is connected to the CAN communication system. Therefore, before starting troubleshooting, make sure to check that there are no malfunctions in the CAN communication system.
2. *: Use the Techstream.

PROCEDURE

1. VEHICLE BROUGHT TO WORKSHOP Result Proceed to NEXT Result: 1 NEXT See step 2
2. CUSTOMER PROBLEM ANALYSIS Result Proceed to NEXT Result: 1 NEXT See step 3
3. INSPECT BATTERY VOLTAGE Standard Voltage 11 to 14 V If the voltage is below 11 V, recharge or replace the battery before proceeding. Result Proceed to NEXT Result: 1 NEXT See step 4
4. CONNECT TECHSTREAM TO DLC3* Result Proceed to NEXT Result: 1 NEXT See step 5
5. CHECK AND CLEAR DTCS AND FREEZE FRAME DATA* Refer to DTC Check / Clear. Refer to «DTC CHECK / CLEAR [08/2013 - ]»(ref-635451-S23043650912014070300000) Powertrain > Engine and ECT > Trouble Codes Result Proceed to NEXT Result: 1 NEXT See step 6
6. VISUAL INSPECTION Result Proceed to NEXT Result: 1 NEXT See step 7
7. SELECT CHECK MODE DIAGNOSIS* Refer to Check Mode Procedure. Refer to «CHECK MODE PROCEDURE [08/2013 - ]»(ref-635451-S08704708882014070300000) Powertrain > Engine and ECT > Utility Tester Display Check Mode Result Proceed to NEXT Result: 1 NEXT See step 8
8. PROBLEM SYMPTOM CONFIRMATION Refer to Road Test. Refer to «ROAD TEST [08/2013 - ]»(ref-635451-S16191746382014070300000) Result Result Proceed to Symptom does not occur A Symptom occurs B Result: 2 B See step 10 Result: 1 A See step 9
9. SYMPTOM SIMULATION Refer to Symptom Simulation. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING [08/2013 - 04/2014]»(ref-635429-S08037721622014070300000) Refer to «HOW TO PROCEED WITH TROUBLESHOOTING [04/2014 - ]»(ref-635429-S26261876542014070300000) Result Proceed to NEXT Result: 1 NEXT See step 10
10. DTC CHECK* Refer to DTC Check / Clear. Refer to «CHECK MODE PROCEDURE [08/2013 - ]»(ref-635451-S08704708882014070300000) Powertrain > Engine and ECT > Trouble Codes Result Result Proceed to DTCs are not output A DTCs are output B Result: 2 B See step 20 Result: 1 A See step 11
11. BASIC INSPECTION Refer to Park/Neutral Position Switch Assembly. Refer to «ADJUSTMENT [08/2013 - ]»(ref-635580-S09011156712014070300000) Refer to Shift Lever Assembly. Refer to «ADJUSTMENT [08/2013 - ]»(ref-635580-S37557729312014070300000) Result Proceed to OK NG Result: 2 NG See step 18 Result: 1 OK See step 12
12. MECHANICAL SYSTEM TESTS Refer to Mechanical System Tests. Refer to «MECHANICAL SYSTEM TESTS [08/2013 - ]»(ref-635451-S16218844792014070300000) Result Proceed to OK NG Result: 2 NG See step 17 Result: 1 OK See step 13
13. HYDRAULIC TEST Refer to Hydraulic Test. Refer to «HYDRAULIC TEST [08/2013 - ]»(ref-635451-S34973979842014070300000) Result Proceed to OK NG Result: 2 NG See step 17 Result: 1 OK See step 14
14. MANUAL SHIFTING TEST Refer to Manual Shifting Test. Refer to «MANUAL SHIFTING TEST [08/2013 - ]»(ref-635451-S02224470662014070300000) Result Proceed to OK NG Result: 2 NG See step 16 Result: 1 OK See step 15
15. PROBLEM SYMPTOMS TABLE CHAPTER 1 Refer to Problem Symptoms Table. Refer to «PROBLEM SYMPTOMS TABLE [08/2013 - ]»(ref-635451-S36365277872014070300000) Result Proceed to OK NG Result: 2 NG See step 21 Result: 1 OK See step 16
16. PROBLEM SYMPTOMS TABLE CHAPTER 2 Refer to Problem Symptoms Table. Refer to «PROBLEM SYMPTOMS TABLE [08/2013 - ]»(ref-635451-S36365277872014070300000) Result Proceed to NEXT Result: 1 NEXT See step 17
17. COMPONENT INSPECTION Result Proceed to NEXT Result: 1 NEXT See step 18
18. REPAIR OR REPLACE Result Proceed to NEXT Result: 1 NEXT See step 19
19. CONFIRMATION TEST Result Proceed to NEXT Result: 1 NEXT END
20. DTC CHART Refer to Diagnostic Trouble Code Chart. Refer to «DIAGNOSTIC TROUBLE CODE CHART [08/2013 - ]»(ref-635451-S07754300462014070300000) Result Proceed to NEXT Result: 1 NEXT See step 21
21. CIRCUIT INSPECTION Result Proceed to NEXT Result: 1 NEXT See step 22
22. IDENTIFICATION INFORMATION Result Proceed to NEXT Result: 1 NEXT See step 18

MECHANICAL SYSTEM TESTS [08/2013 - ]

1. STALL SPEED TEST HINT: This test is to check the overall performance of the engine and transaxle. WARNING: This test should be done on a paved surface (a surface that is not slippery). To ensure safety, perform this test in an open and level area that provides good traction. The stall speed test should always be performed with at least 2 people. One person should observe the condition of the wheels and wheel chocks while the other is performing the test. NOTE: Do not perform the stall speed test for longer than 5 seconds. Perform this test with the ATF (Automatic Transmission Fluid) at the normal operating temperature: 50 to 80°C (122 to 176°F) Connect the Techstream to the DLC3. Drive the vehicle until the transmission fluid temperature has reached 50 to 80°C (122 to 176°F). Allow the engine to idle with the air conditioning and headlights off. Chock all 4 wheels. Set the parking brake and keep the brake pedal depressed firmly with your left foot. Move the shift lever to D. Depress the accelerator pedal as much as possible with your right foot. Read the engine speed (stall speed) and release the accelerator pedal immediately. Standard Value Stall Speed 2390 RPM + 300 RPM - 300 RPM EVALUATION Test Result Possible Cause Stall speed is lower than standard value Engine power output may be insufficient Stator one-way clutch is not operating properly HINT: If the value is less than the specified value by 600 RPM or more, the torque converter could be faulty. Stall speed is higher than standard value Line pressure is too low Forward clutch slipping No. 2 one-way clutch is not operating properly Improper fluid level
2. SHIFT TIME LAG TEST HINT: When the shift lever is moved while the engine is idling, there will be a certain time lapse or lag before shock can be felt. This is used for checking the condition of the clutch and brake. Connect the Techstream to the DLC3. Drive the vehicle until the transmission fluid temperature has reached 50 to 80°C (122 to 176°F). Allow the engine to idle with the air conditioning OFF. Set the parking brake and keep the brake pedal depressed firmly. Check the D position time lag. Move the shift lever to N and wait for 1 minute. Move the shift lever to D and measure the time until shock is felt. Repeat the 2 steps above 3 times, and calculate the average time of the 3 tests. Check the R position time lag. Move the shift lever to N and wait for 1 minute. Move the shift lever to R and measure the time until shock is felt. Repeat the 2 steps above 3 times, and calculate the average time of the 3 tests. Standard Value D position time lag is less than 1.2 seconds R position time lag is less than 1.5 seconds EVALUATION (IF N --> D OR N --> R TIME LAG IS LONGER THAN THE SPECIFIED) Test Result Possible Cause D position time lag exceeds standard value Line pressure is too low Forward clutch is worn No. 2 one-way clutch is not operating properly R position time lag exceeds standard value Line pressure is too low Reverse clutch is worn 1st and reverse brake is worn

Scheme 12

1. PERFORM HYDRAULIC TEST Measure the line pressure. WARNING: The line pressure test should always be carried out with at least 2 people. One person should observe the condition of wheels and wheel chocks while the other is performing the test. NOTE: Perform this test with the ATF (Automatic Transmission Fluid) at the normal operating temperature: 50 to 80°C (122 to 176°F) Be careful to prevent the SST hose from contacting the exhaust pipe. This check must be conducted after checking and confirming that the engine is normal. Perform this test with the A/C off. Do not perform the stall speed test for longer than 5 seconds. Warm up the ATF (Automatic Transmission Fluid). Lift the vehicle up. Remove the test plug on the front left side of the transaxle case and connect SST. SST: 09992-00095 09992-00231 09992-00271 Lower the vehicle. Fully apply the parking brake and chock all 4 wheels. Connect the Techstream to the DLC3. Start the engine and check the idle speed. Keep your left foot pressing firmly on the brake pedal and move the shift lever to D. Measure the line pressure when the engine is idling. Depress the accelerator pedal all the way down. Quickly read the highest line pressure when engine speed reaches stall speed. In the same way, do the test with the shift lever in R. SPECIFIED LINE PRESSURE: Condition D Position kPa (kgf/cm 2 , psi) R Position kPa (kgf/cm 2 , psi) Idling 372 to 412 kPa (3.7 to 4.2 kgf/cm 2 , 53 to 60 psi) 553 to 623 kPa (5.6 to 6.4 kgf/cm 2 , 80 to 91 psi) Stall test 1126 to 1226 kPa (11.4 to 12.5 kgf/cm 2 , 163 to 178 psi) 1664 to 1864 kPa (16.9 to 19.0 kgf/cm 2 , 241 to 271 psi) EVALUATION: Problem Possible Cause Measured values at all positions are higher than specified Shift solenoid valve SLT defective Regulator valve defective Measured values at all positions are lower than specified Shift solenoid valve SLT defective Regulator valve defective Oil pump defective Pressure is low when shift lever is in D only D position circuit fluid leak Forward clutch defective Pressure is low when shift lever is in R only R position circuit fluid leak Reverse clutch defective 1st and reverse brake defective

Scheme 13

1. MANUAL SHIFTING TEST The purpose of this test is to determine whether a problem is caused by either mechanical or electrical factors. Disconnecting the transmission wire disables electrically-controlled automatic gear shifting. In this case, operating the shift lever is the only way to shift the transaxle gear. If the gear is not changed by shift lever operation, it can be assumed that there is a mechanical problem. Turn the ignition switch off. Disconnect the transmission wire connector. Warm up the engine. Drive the vehicle. Check the transaxle operation when the shift lever is moved to L, 2, 3 and D. STANDARD: Shift Position Operation L to 2 No Shift (Not Change) 2 to 3 No Shift (Not Change) 3 to D No Shift (Not Change) D to 3 No Shift (Not Change) 3 to 2 No Shift (Not Change) 2 to L No Shift (Not Change) Turn the ignition switch off. Connect the transmission wire connector. Clear the DTCs. Refer to «DTC CHECK / CLEAR [08/2013 - ]»(ref-635451-S23043650912014070300000) Powertrain > Engine and ECT > Clear DTCs HINT: When the transmission wire is disconnected, the transaxle gear will be set as listed below. Shift Lever Gear P Parking R Reverse N Neutral D 3rd 3 3rd 2 3rd L 3rd

INITIALIZATION [08/2013 - ]

1. RESET MEMORY NOTE: Perform Reset Memory (AT initialization) when replacing the automatic transaxle assembly, engine assembly or ECM. Reset Memory can be performed only with the Techstream. HINT: The ECM memorizes the condition that the ECT controls the automatic transaxle assembly and engine assembly according to those characteristics. Therefore, when the automatic transaxle assembly, engine assembly, or ECM has been replaced, it is necessary to reset the memory so that the ECM can memorize the new information. Reset Memory procedure is as follows. Turn the ignition switch off. Connect the Techstream to the DLC3. Turn the ignition switch to ON. Turn the Techstream on. Enter the following menus: Powertrain / Engine and ECT / Utility / Reset Memory. Powertrain > Engine and ECT > Utility Tester Display Reset Memory NOTE: After performing Reset Memory, be sure to perform the Road Test described earlier. Refer to «ROAD TEST [08/2013 - ]»(ref-635451-S16191746382014070300000) HINT: ECM learning is performed by performing the road test.

Scheme 14

1. MONITOR DRIVE PATTERN FOR ECT TEST Perform this drive pattern as one method to simulate the detection conditions of the ECT malfunctions. (The DTCs may not be detected due the actual driving conditions. And some codes may not be detected through this drive pattern.) HINT: Preparation for driving Warm up the engine sufficiently. (Engine coolant temperature of 60°C (140°F) or higher.) Drive the vehicle when the atmospheric temperature is -10°C (14°F) or higher. (Some malfunctions are not detected when the atmospheric temperature is less than -10°C (14°F).) Driving note Drive the vehicle through all gears. Stop --> 1st --> 2nd --> 3rd --> 4th --> 4th (lock-up ON). Repeat the above drive pattern three times or more. NOTE: When using the Techstream, the monitor status can be checked in the Data List. Refer to «DATA LIST / ACTIVE TEST [08/2013 - ]»(ref-635451-S06399686102014070300000) In the event that the drive pattern must be interrupted (possibly due to traffic conditions or other factors), the drive pattern can be resumed and, in most cases, the monitor can be completed. Perform this drive pattern on a level road as much as possible and strictly observe the posted speed limits and traffic laws while driving. HINT: *: Drive at a speed in highest gear that will cause lock-up to engage. The vehicle can be driven at a speed lower than the speed shown in the above diagram under lock-up. NOTE: It is necessary to drive the vehicle for approximately 30 minutes to detect DTC P0711 (ATF temperature sensor malfunction).

FAIL-SAFE CHART [08/2013 - ]

1. FAIL-SAFE This function minimizes the loss of the ECT functions when a malfunction occurs in each sensor or solenoid. Vehicle speed signal (SPD): When there are problems with vehicle speed signals, 4th upshift is prohibited. Input turbine speed sensor NT (Transmission revolution sensor NT): When the input turbine speed sensor has a malfunction, 4th upshift is prohibited. ATF (Automatic Transmission Fluid) temperature sensor: When the ATF temperature sensor has a malfunction, 4th upshift is prohibited. Shift solenoid valve SLU: If the ECM detects a malfunction in the solenoid valve SLU, it turns the valve off. Shift solenoid valve SLT: When the solenoid valve SLT has a malfunction, 4th upshift is prohibited. Engine coolant temperature sensor: When the engine coolant temperature sensor has a malfunction, 4th upshift is prohibited. Knock sensor: When the knock sensor has a malfunction, 4th upshift is prohibited. Throttle position sensor: When the throttle position sensor has a malfunction, 4th upshift is prohibited. Shift solenoid valve S1 and S2: Fail safe function: If either of the shift solenoid valve circuits develops an open or short, the ECM turns the other shift solenoid "ON" and "OFF" in order to shift into the gear positions as shown in the table below. The ECM also turns the shift solenoid valve ST OFF at the same time. If both solenoids malfunction, hydraulic control cannot be performed electronically and must be done manually. Manual shifting as shown in the following table must be done (In case of a short circuit, the ECM stops sending current to the short circuit solenoid). Even if starting the engine in the fail-safe mode, the gear position remains in the same position. Normal Solenoid Valve S1 ON ON OFF OFF S2 ON OFF OFF ON Gear Position 1st 2nd 3rd 4th (O/D) S1 Malfunction Solenoid Valve S1 X S2 ON --> OFF OFF OFF ON Gear Position *1 3rd 3rd 3rd 4th (O/D) S2 Malfunction Solenoid Valve S1 ON ON OFF OFF S2 X Gear Position *1 2nd 2nd 3rd 3rd S1 and S2 Malfunction Solenoid Valve S1 X S2 X Gear Position *1 3rd 3rd 3rd 3rd *1: Actual gear shift (gear position) under fail-safe operation. X: OFF (the ECM stops sending current to a malfunctioning solenoid valve) -->: Condition in the electrical malfunction is shown on the left of "-->". Condition in the fail-safe mode is shown on the right of "-->".