Automatic Transmission Electronic Controlled (ECT) - Diagnostics: Diagnosis Toyota Corolla IX рестайлинг

HOW TO PROCEED WITH TROUBLESHOOTING

HINT: The hand-held tester can be used at steps 3 , 4 , 6 , and 9 .

1. Vehicle Brought to Workshop GO TO NEXT STEP.
2. Customer Problem Analysis (SEE «CUSTOMER PROBLEM ANALYSIS CHECK»(ref-225480-S35824836412006031900000) ) GO TO NEXT STEP.
3. Connect the OBD II scan tool or hand-held tester to DLC3 GO TO NEXT STEP.
4. Check and Clear DTC and Freeze Frame Data (SEE «DTC CHECK/CLEAR»(ref-225480-S22498058512006031900000) ) GO TO NEXT STEP.
5. Visual Inspection GO TO NEXT STEP.
6. Setting the Check Mode Diagnosis (SEE «CHECK MODE PROCEDURE»(ref-225480-S03692721522006031900000) ) GO TO NEXT STEP.
7. Problem Symptom Confirmation (SEE «ROAD TEST»(ref-225480-S18887880872006031900000) ) Symptom does not occur: Go to step 8 Symptom occur: Go to step 9 .
8. Symptom Simulation (SEE «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-225473-S30360289022006031900000) ) GO TO NEXT STEP.
9. DTC Check (SEE «DTC CHECK/CLEAR»(ref-225480-S22498058512006031900000) ) DTC is not output: Go to step 10 DTC is output: Go to step 17 .
10. Basic Inspection (SEE «ON-VEHICLE INSPECTION»(ref-225506-S27627571872006031900000) , «ADJUSTMENT»(ref-225506-S39052373042006031900000) and «ADJUSTMENT»(ref-225506-S30480269632006031900000) ) NG: Go to step 19 . OK: GO TO NEXT STEP.
11. Mechanical System Test (SEE «MECHANICAL SYSTEM TESTS»(ref-225480-S04724556752006031900000) ) NG: Go to step 16 . OK: GO TO NEXT STEP.
12. Hydraulic Test (SEE «HYDRAULIC TEST»(ref-225480-S33766889522006031900000) ) NG: Go to step 16 . OK: GO TO NEXT STEP.
13. Manual Shifting Test (SEE «MANUAL SHIFTING TEST»(ref-225480-S04453519632006031900000) ) NG: Go to step 15 . OK: GO TO NEXT STEP.
14. Problem Symptoms Table Chapter 1 (SEE «PROBLEM SYMPTOMS TABLE»(ref-225480-S00630620892006031900000) ) NG: Go to step 18 . OK: GO TO NEXT STEP.
15. Problem Symptoms Table Chapter 2 (SEE «PROBLEM SYMPTOMS TABLE»(ref-225480-S00630620892006031900000) ) GO TO NEXT STEP.
16. Part Inspection Go to step 19 .
17. DTC Chart (SEE «DIAGNOSTIC TROUBLE CODE CHART»(ref-225480-S31040901712006031900000) ) GO TO NEXT STEP.
18. Circuit Inspection GO TO NEXT STEP.
19. Repair or Replace GO TO NEXT STEP.
20. Confirmation Test GO TO NEXT STEP.
21. End

Scheme 75

ROAD TEST

1. PROBLEM SYMPTOM CONFIRMATION Based on the result of the customer problem analysis, try to reproduce the symptoms. If the problem is that the transaxle does not shift up, shift down, or the shift point is too high or too low, conduct the following road test referring to the automatic shift schedule and simulate the problem symptoms.
2. ROAD TEST NOTE: Perform the test at the ATF (Automatic Transmission Fluid) temperature 50 to 80°C (122 to 176°F) in the normal operation. D position test: Shift into the D position and fully depress the accelerator pedal and check the following points. Check up-shift operation. Check that 1 -> 2, 2 -> 3 and 3 -> O/D up-shifts take place, and that the shift points conform to the automatic shift schedule (see «SERVICE DATA»(ref-225475-S34676957632006031900000) ). HINT: O/D Gear Up-shift Prohibition Control Engine coolant temperature is 55°C (131°F) or less and vehicle speed is at 70 km/h (43 mph) or less. O/D Gear Lock-up Prohibition Control Brake pedal is depressed. Accelerator pedal is released. Engine coolant temperature is 55°C (131°F) or less. 3rd Gear Lock-up Prohibition Control O/D main switch off (O/D ON) Check for shift shock and slip. Check for shock and slip at the 1 -> 2, 2 -> 3 and 3 -> O/D up-shifts. Check for abnormal noise and vibration. Check for abnormal noise and vibration when up-shifting from 1 -> 2, 2 -> 3 and 3 -> O/D while driving with the shift lever in the D position, and check while driving in the lock-up condition. HINT: The check for the cause of abnormal noise and vibration must be done thoroughly as it could also be due to loss of balance in the differential, torque converter clutch, etc. Check kick-down operation. Check vehicle speeds when the 2nd to 1st, 3rd to 2nd and O/D to 3rd kick-downs take place while driving with the shift lever in the D position. Confirm that each speed is within the applicable vehicle speed range indicated in the automatic shift schedule (see «SERVICE DATA»(ref-225475-S34676957632006031900000) ). Check abnormal shock and slip at kick-down. Check the lock-up mechanism. Drive in D position (O/D gear), at a steady speed (lock-up ON). Lightly depress the accelerator pedal and check that the engine speed does not change abruptly. HINT: There is no lock-up function in the 1st and 2nd gear. If there is a big jump in engine speed, there is no lock-up. position test: Shift into the 2 position and fully depress the accelerator pedal and check the following points. Check up-shift operation. Check that the 1 -> 2 up-shift takes place and that the shift point conforms to the automatic shift schedule (see «SERVICE DATA»(ref-225475-S34676957632006031900000) ). HINT: There is no 3rd up-shift and lock-up in the 2 position. Check engine braking. While running in the 2 position and 2nd gear, release the accelerator pedal and check the engine braking effect. Check for abnormal noise during acceleration and deceleration, and for shock at up-shift and down-shift. L position test: Shift into the L position and fully depress the accelerator pedal and check the following points. Check no up-shift. While running in the L position, check that there is no up-shift to 2nd gear. HINT: There is no lock-up in the L position. Check engine braking. While running in the L position, release the accelerator pedal and check the engine braking effect. Check for abnormal noise during acceleration and deceleration. R position test: Shift into the R position, lightly depress the accelerator pedal, and check that the vehicle moves backward without any abnormal noise or vibration. CAUTION: Before conducting this test ensure that the test area is free from people and obstruction. P position test: Stop the vehicle on the grade (more than 5°) and after shifting into the P position, release the parking brake. Then, check that the parking lock pawl holds the vehicle in place.

Scheme 76

Scheme 77

1. PERFORM MECHANICAL SYSTEM TESTS Measure the stall speed. The object of this test is to check the overall performance of the transaxle and engine by measuring the stall speeds in the D and R positions. NOTE: Perform the test at the normal operating ATF (Automatic Transmission Fluid) temperature 50 to 80°C (122 to 176°F). Do not continuously run this test for longer than 10 seconds. To ensure safety, do this test in a wide, clear level area which provides good traction. The stall 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 doing the test. Chock the 4 wheels. Connect an OBD II scan tool or hand-held tester to the DLC3. Fully apply the parking brake. Keep your left foot pressed firmly on the brake pedal. Start the engine. Shift into the D position. Press all the way down on the accelerator pedal with your right foot. Quickly read the stall speed at this time. Stall speed: 2,550 +/- 150 rpm Do the same test in the R position. Stall speed: 2,550 +/- 150 rpm Evaluation: Measure the time lag. When the shift lever is shifted while the engine is idling, there will be a certain time lapse or lag before the shock can be felt. This is used for checking the condition of the direct clutch, forward clutch, and 1st and reverse brake. NOTE: Perform the test at the normal operating ATF temperature 50 to 80°C (122 to 176°F). Be sure to allow 1 minute interval between tests. Perform the test three times, and measure the time lags. Calculate the average value of the three time lags. Connect an OBD II scan tool or hand-held tester to the DLC3. Fully apply the parking brake. Start and warm up the engine and check idle speed. Idle speed: approx. 700 rpm (In N position and A/C OFF) Shift the lever from N to D position. Using a stop watch, measure the time from when the lever is shifted until the shock is felt. Time lag: N -> D less than 1.2 seconds In the same way, measure the time lag for N -> R. Time lag: N -> R less than 1.5 seconds Evaluation (If N -> D or N -> R time lag is longer than the specified)

Scheme 78

1. PERFORM HYDRAULIC TEST Measure the line pressure. NOTE: Perform the test at the normal operating ATF (Automatic Transmission Fluid) temperature 50 to 80°C (122 to 176°F). The line pressure test should always be carried out in pairs. One technician should observe the conditions of wheels or wheel stopper outside the vehicle while the other is doing the test. Be careful to prevent SST's 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 10 seconds. Warm up the ATF. Remove the test plug on the left side of the transaxle case and connect SST. SST 09992-00095 (09992- 00231, 09992-00271) Fully apply the parking brake and chock the 4 wheels. Connect an OBD II scan tool or hand-held tester to the DLC3. Start the engine and check idling speed. Keep your left foot pressing firmly on the brake pedal and shift into D position. 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 in R position.

LINE PRESSURE SPECIFICATION

Evaluation

Scheme 79

Scheme 80

1. PERFORM MANUAL SHIFTING TEST HINT: By this test, it can be determined whether the trouble is within the electrical circuit or is a mechanical problem in the transaxle. Disconnect the transmission wire connector. Inspect the manual driving operation. Check that the shift and gear positions correspond to the table below. While driving, shift through the L, 2 and D positions. Check that the gear change corresponds to the shift position. SHIFT POSITION AND GEAR POSITION Shift Position Gear Position D O/D 2 O/D L 1st R Reverse P Pawl Lock HINT: If the gear positions of the L, 2 and D are difficult to distinguish, do the following road test (see «ROAD TEST»(ref-225480-S18887880872006031900000) ). If any abnormality is found in the above test, the problem is in the transaxle itself. Connect the transmission wire connector. Clear the DTC (see «DTC CHECK/CLEAR»(ref-225480-S22498058512006031900000) ).

Scheme 81

1. RESET MEMORY CAUTION: Perform the RESET MEMORY (AT initialization) when replacing the automatic transaxle assy, engine assy or ECM. NOTE: Hand-held tester only HINT: The ECM memorizes the condition that the ECT controls the automatic transaxle assy and engine assy according to those characteristics. Therefore, when the automatic transaxle assy, engine assy, or ECM has been replaced, it is necessary to reset the memory so that the ECM can memorize the new information. Reset procedure is as follows. Turn the ignition switch off. Connect the hand-held tester to the DLC3. Turn the ignition switch to the ON position and push the hand-held tester main switch on. Select the item "DIAGNOSIS/ENHANCED OBD II". Perform the reset memory procedure from the ENGINE menu. CAUTION: After performing the RESET MEMORY, be sure to perform the ROAD TEST (see «ROAD TEST»(ref-225480-S18887880872006031900000) ) described earlier. HINT: The ECM is learned by performing the ROAD TEST.

PROBLEM SYMPTOMS TABLE

HINT: If a normal code is displayed during the diagnostic trouble code check although the trouble still occurs, check the electrical circuits for each symptom in the order given in the charts on the following pages and proceed to the page given for troubleshooting.

The Matrix Chart is divided into 2 chapters.

Scheme 82

Scheme 83

Scheme 84

1. Chapter 1: Electronic Circuit Matrix Chart Refer to the table below when the trouble cause is considered to be electrical. If the instruction "Proceed to next circuit inspection shown on matrix chart" is given in the flow chart of each circuit, proceed to the circuit with the next highest number in the table to continue the check. If the trouble still occurs even though there are no abnormalities in any of the other circuits, check and replace the ECM. HINT: *1: When the circuit on which mark *1 is attached is a malfunction, DTC could be output (see «DIAGNOSTIC TROUBLE CODE CHART»(ref-225480-S31040901712006031900000) ).
2. Chapter 2: On-Vehicle Repair and Off-Vehicle Repair (*: See appropriate AUTOMATIC TRANSMISSION OVERHAUL article.)

Scheme 85

HINT: Each ECM terminal's standard voltage is shown in the table below.

In ECM TERMINALS DESCRIPTION AND VOLTAGE, first follow the information under "Condition". Look under "Symbols (Terminal No.)" for the terminals to inspected. The standard voltage between the terminals is shown under "Specific Condition". Use (Scheme 85) as a reference for the ECM terminals.

ECM TERMINALS DESCRIPTION AND VOLTAGE

Scheme 86

Scheme 87

1. DIAGNOSIS SYSTEM Description When troubleshooting OBD II vehicles, the only difference from the usual troubleshooting procedure is that you need to connect an OBD II scan tool complying with SAE J1987 or a hand-held tester to the vehicle, and read off various data output from the vehicle's ECM. OBD II regulations require that the vehicle's on board computer illuminate the Malfunction Indicator Lamp (MIL) on the instrument panel when the computer detects a malfunction in the computer itself or in the drive system components which affect the vehicle emissions. In addition to the MIL illuminating when a malfunction is detected, the applicable DTCs prescribed by SAE J2012 are recorded in the ECM memory (see «DIAGNOSTIC TROUBLE CODE CHART»(ref-225480-S31040901712006031900000) ). If the malfunction does not occur in 3 consecutive trips, the MIL goes off but the DTCs remain in the ECM memory. To check the DTCs, connect the OBD II scan tool or hand-held tester to the DLC3 of the vehicle. The OBD II scan tool or hand-held tester also enables you to erase the DTCs and check freeze frame data and various forms of engine data (For instruction book). The DTCs include SAE controlled codes and Manufacturer controlled codes. SAE controlled codes must be set as prescribed by the SAE, while Manufacturer controlled codes can be set freely by a manufacturer within the prescribed limits (see the DTC chart on «DIAGNOSTIC TROUBLE CODE CHART»(ref-225480-S31040901712006031900000) ). The diagnosis system operates in the normal mode during the normal vehicle use, and also has a check mode for technicians to simulate malfunction symptoms and perform troubleshooting. Most DTCs use 2 trip detection logic(*) to prevent erroneous detection. By switching the ECM to the check mode when troubleshooting, the technician can cause the MIL to illuminate for a malfunction that is only detected once or momentarily (hand-held tester). *2 trip detection logic: When a malfunction is first detected, the malfunction is temporarily stored in the ECM memory. If the same malfunction is detected again during the second test drive, this second detection causes the MIL to illuminate. Inspect the DLC3. The vehicle's ECM uses ISO 9141-2 for communication. The terminal arrangement of DLC3 complies with SAE J1962 and matches the ISO 9141-2 format. DLC3 CONNECTOR TERMINALS VOLTAGE AND RESISTANCE Testerconnection Condition Specified condition 7 (Bus (+) Line) -5 (Signal ground) Duringcommunication Pulse generation 4 (Chassis Ground) - Body Always 1 ohm or less 5 (Signal Ground) - Body Always 1ohm or less 16(B+)-Body Always 9 to 14 V HINT: If your display shows UNABLE TO CONNECT TO VEHICLE when you have connected the cable of the OBD II scan tool or hand-held tester to the DLC3, turned the ignition switch to the ON position and operated the scan tool, there is a problem on the vehicle side or tool side. If the communication is normal when the tool is connected to another vehicle, inspect the DLC3 on the original vehicle. If the communication is still impossible when the tool is connected to another vehicle, the problem is probably in the tool itself, so consult the Service Department listed in the tool's instruction manual. Measure the battery voltage. Battery Voltage: 11 to 14 V If voltage is below 11 V, recharge the battery before proceeding. Check the MIL. The MIL comes on when the ignition switch is turned to the ON position and the engine is not running. HINT: If the MIL does not light up, troubleshoot the combination meter. When the engine is started, the MIL should go off. If the lamp remains on, it means that the diagnosis system has detected a malfunction or abnormality in the system.

Scheme 88

1. DTC CHECK (NORMAL MODE) NOTE: When the diagnostic system is switched from the normal mode to the check mode, all the DTCs and freeze frame data recorded in the normal mode will be erased. So before switching modes, always check the DTCs and freeze frame data, and note them down. Checking DTCs using the OBD II scan tool or hand-held tester. Turn the ignition switch off. Connect the OBD II scan tool or hand-held tester to DLC3. Turn the ignition switch to the ON position and push the OBD II scan tool or the hand-held tester main switch on. When you use hand-held tester: Select the item "DIAGNOSIS/ENHANCED OBD II/ DTC INFO/CURRENT CODES". Use the OBD II scan tool or hand-held tester to check the DTCs and freeze frame data and note them down (For operating instructions, see the OBD II scan tool's instruction book). See «DIAGNOSTIC TROUBLE CODE CHART»(ref-225480-S31040901712006031900000) to confirm the details of the DTCs. NOTE: When simulating symptoms with an OBD II scan tool (excluding hand-held tester) to check the DTCs, use the normal mode. For codes on the DTCs chart subject to "2 trip detection logic", turn the ignition switch off after the symptom is simulated once. Then repeat the simulation process again. When the problem has been simulated twice, the MIL is indicated on the instrument panel and DTCs are recorded in the ECM.
2. DTC CLEAR When using the OBD II scan tool or hand-held tester: Clearing the DTCs. Connect the OBD II scan tool or hand-held tester to the DLC3. Turn the ignition switch to the ON position and push the OBD II scan tool or the hand-held tester main switch on. When you use hand-held tester: Select the item "DIAGNOSIS/ENHANCED OBD II/ DTC INFO/CLEAR CODES [YES] button". HINT: When operating the OBD II scan tool (complying with SAE J1978) or hand-held tester to erase the codes, the DTCs and freeze frame data will be erased. (See the OBD II scan tool's instruction book for operating instructions.) When not using the OBD II scan tool or hand-held tester: Clearing the DTCs. Disconnecting the battery terminal or remove the EFI and ETCS fuses from the engine room J/B for 60 seconds or more. But if you disconnect the battery terminal, you should do the "INITIALIZE" procedure.

Scheme 89

Scheme 90

1. DTC CHECK (CHECK MODE) HINT: Hand-held tester only: Compared to the normal mode, the check mode has more sensing ability to detect malfunctions. Furthermore, the same diagnostic items which are detected in the normal mode can also be detected in the check mode. Procedure for Check Mode using the hand-held tester. Check the initial conditions. Battery positive voltage 11 V or more Throttle valve fully closed Transaxle in the P or N position A/C switch is off Turn the ignition switch off. Connect the hand-held tester to the DLC3. Turn the ignition switch to the ON position and push the hand-held tester main switch on. When you use hand-held tester: Select the item "DIAGNOSIS/ENHANCED OBD II/ CHECK MODE" (Check that the MIL flashes). NOTE: All DTCs and freeze frame data recorded will be erased if: 1) the hand-held tester is used to change the ECM from normal mode to check mode or vice-versa; or 2) during check mode, the ignition switch is turned from ON to ACC or OFF. Start the engine (MIL goes off after the engine starts). Perform "MONITOR DRIVE PATTERN" for the ECT test (see «MONITOR DRIVE PATTERN»(ref-225480-S15494777032006031900000) ). (Or, simulate the conditions of the malfunction described by the customer). NOTE: Leave the ignition switch in the ON position until you have checked the DTCs, etc. After simulating malfunction conditions, use the hand-held tester diagnosis selector to check the DTCs and freeze frame data, etc. When you use hand-held tester: Select the item "DIAGNOSIS/ENHANCED OBD II/ DTC INFO/CURRENT CODES". After checking the DTC, inspect the applicable circuit. See «DIAGNOSTIC TROUBLE CODE CHART»(ref-225480-S31040901712006031900000) to confirm the details of the DTCs.
2. DTC CLEAR When using the OBD II scan tool or hand-held tester: Clearing the DTCs. Connect the OBD II scan tool or hand-held tester to the DLC3. Turn the ignition switch to the ON position and push the OBD II scan tool or the hand-held tester main switch on. When you use hand-held tester: Select the item "DIAGNOSIS/ENHANCED OBD II/ DTC INFO/CLEAR CODES [YES] button". HINT: When operating the OBD II scan tool (complying with SAE J1978) or hand-held tester to erase the codes, the DTCs and freeze frame data will be erased. (See the OBD II scan tool's instruction book for operating instructions.) When not using the OBD II scan tool or hand-held tester: Clearing the DTCs. Disconnecting the battery terminal or remove the EFI and ETCS fuses from the engine room J/B for 60 seconds or more. But if you disconnect the battery terminal, you should do the "INITIALIZE" procedure.

Scheme 91

1. FAIL-SAFE This function minimizes the loss of the ECT functions when any malfunction occurs in each sensor or solenoid. Vehicle speed signal (SPD): The vehicle speed is detected through signals from the crankshaft position sensor and shift position signal to maintain normal control when the speed sensor has a malfunction. Shift solenoid valve SL: If the ECM detects a malfunction in the solenoid valve SL, it turns the valve off. 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 shown in the table below. Manual shifting (Scheme 91)must be done (In case of a short circuit, the ECM stops sending the current to the short circuit solenoid). Even if starting the engine in the fail-safe mode, the gear position remain in the same position.

Scheme 92

Scheme 93

1. DATA LIST HINT: According to the DATA LIST displayed by the OBD II scan tool or hand-held tester, you can read the value of the switch, sensor, actuator and so on without parts removal. Reading the DATA LIST as the first step of troubleshooting is one method to shorten labor time. Warm up the engine. Turn the ignition switch off. Connect the OBD II scan tool or hand-held tester to the DLC3. Turn the ignition switch to the ON position. Push the "ON" button of the OBD II scan tool or the hand-held tester. When you use hand-held tester: Select the item "DIAGNOSIS/ENHANCED OBD II/DATA LIST". According to the display on tester, read the "DATA LIST".
2. ACTIVE TEST HINT: Performing the ACTIVE TEST using the hand-held tester allows the relay, VSV, actuator and so on to operate without parts removal. Performing the ACTIVE TEST as the first step of troubleshooting is one method to shorten labor time. It is possible to display the DATA LIST during the ACTIVE TEST. Warm up the engine. Turn the ignition switch off. Connect the hand-held tester to the DLC3. Turn the ignition switch to the ON position. Push the "ON" button of the hand-held tester. Select the item "DIAGNOSIS/ENHANCED OBD II/ACTIVE TEST". According to the display on tester, perform the "ACTIVE TEST". HINT: The pressure values in ACTIVE TEST and HYDRAULIC TEST are different from each other.

DIAGNOSTIC TROUBLE CODE CHART

If a DTC is displayed during the DTC check, check the parts listed in (Scheme 94).

Scheme 94

INSPECTION PROCEDURE

HINT: According to the DATA LIST displayed by the OBD II scan tool or hand-held tester, you can read the value of the switch, sensor, actuator and so on without parts removal. Reading the DATA LIST as the first step of troubleshooting is one method to shorten labor time.

Scheme 95

1. Turn the ignition switch off.
2. Connect the OBD II scan tool or hand-held tester to the DLC3.
3. Turn the ignition switch to the ON position.
4. Push the "ON" button of the OBD II scan tool or the hand-held tester.
5. When you use hand-held tester: Select the item "DIAGNOSIS/ENHANCED OBD II/DATA LIST".
6. According to the display on tester, read the "DATA LIST".

Scheme 96

Scheme 97

Scheme 98

Scheme 99

1. INSPECT PARK/NEUTRAL POSITION SWITCH ASSY Disconnect the park/neutral position switch connector. Measure resistance according to the value(s) in (Scheme 97) when the shift lever is moved to each position. Standard: NG: REPLACE PARK/NEUTRAL POSITION SWITCH ASSY (SEE «PARK/NEUTRAL POSITION SWITCH ASSY (A245E)»(ref-225506-S32333648522006031900000) ) OK: GO TO NEXT STEP
2. CHECK HARNESS AND CONNECTOR (PARK/NEUTRAL POSITION SWITCH ECM) Connect the park/neutral position switch connector. Turn the ignition switch to the ON position, and measure the voltage according to the value(s) in (Scheme 99) when the shift lever is moved to each position. Standard: HINT: *: The voltage will drop slightly due to lighting up of the back up light. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (SEE «ELECTRONIC CIRCUIT INSPECTION PROCEDURE»(ref-225473-S18636529692006031900000) ) OK: REPLACE ECM (SEE «ECM (1ZZ-FE/2ZZ-GE) REPLACEMENT»(ref-225491-S27442506802006031900000) )

CIRCUIT DESCRIPTION

The purpose of this circuit is to prevent the engine from stalling while driving in lock-up condition, when brakes are suddenly applied.

When the brake pedal is depressed, this switch sends a signals to the ECM. Then the ECM cancels the operation of the lock-up clutch while braking is in progress.

Scheme 100

HINT

According to the DATA LIST displayed by the OBD II scan tool or hand-held tester, you can read the value of the switch, sensor, actuator and so on without parts removal. Reading the DATA LIST as the first step of troubleshooting is one method to shorten labor time.

Scheme 101

1. Turn the ignition switch off.
2. Connect the OBD II scan tool or hand-held tester to the DLC3.
3. Turn the ignition switch to the ON position.
4. Push the "ON" button of the OBD II scan tool or the hand-held tester.
5. When you use hand-held tester: Select the item "DIAGNOSIS/ENHANCED OBD II/DATA LIST".
6. According to the display on tester, read the "DATA LIST".

Scheme 102

Scheme 103

Scheme 104

Scheme 105

1. INSPECT STOP LAMP SWITCH ASSY Disconnect the stop lamp switch assy connector. Measure the resistance according to the value(s) in (Scheme 103). Standard: NG: REPLACE STOP LAMP SWITCH ASSY OK: GO TO NEXT STEP
2. CHECK HARNESS AND CONNECTOR (STOP LAMP SWITCH ASSY - ECM) Connect the stop lamp switch assy connector. Disconnect the ECM connector. Measure the voltage according to the value(s) in the table below when the brake pedal is depressed and released. Standard: NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (SEE «ELECTRONIC CIRCUIT INSPECTION PROCEDURE»(ref-225473-S18636529692006031900000) ) OK: REPLACE ECM (SEE «ECM (1ZZ-FE/2ZZ-GE) REPLACEMENT»(ref-225491-S27442506802006031900000) )

HINT

Performing the ACTIVE TEST using the hand-held tester allows the relay, VSV, actuator and so on to operate without parts removal. Performing the ACTIVE TEST as the first step of troubleshooting is one method to shorten labor time.

It is possible to display the DATA LIST during the ACTIVE TEST.

1. Warm up the engine.
2. Turn the ignition switch off.
3. Connect the hand-held tester to the DLC3.
4. Turn the ignition switch to the ON position.
5. Push the "ON" button of the hand-held tester.
6. Select the item "DIAGNOSIS/ENHANCED OBD II/ACTIVE TEST".
7. According to the display on tester, perform the "ACTIVE TEST". HAND-HELD TESTER ACTIVE TEST Item Test Details Diagnostic Note LOCK UP [Test Details] Control the shift solenoid SL to set the automatic transaxle to the lockup condition. Possible to check the SL operation. LOCK UP [Vehicle Condition] Vehicle Speed: 58 km/h (36 mph) or more Possible to check the SL operation. HINT: This test can be conducted when the vehicle speed is 58 km/h (36 mph) or more. This test can be conducted with the 3rd or O/D gear.
8. Lightly depress the accelerator pedal and check that the engine speed does not change abruptly.

HINT

Scheme 106

1. When changing the accelerator pedal opening angle while driving, if the engine speed does not change, lock-up is on.
2. Slowly release, but not fully, the accelerator pedal in order to decelerate. (Fully releasing the pedal will close the throttle valve and lock-up may be turned off.)

Scheme 107

1. CHECK OTHER DTCS OUTPUT(IN ADDITION TO DTC P0741) Connect the OBD II scan tool or the hand-held tester to the DLC3. Turn the ignition switch to the ON position and push the OBD II scan tool or the hand-held tester main switch ON. When you use hand-held tester: Select the item "DIAGNOSIS/ENHANCED OBD II/DTC INFO/CURRENT CODES". Read the DTCs using the OBD II scan tool or the hand-held tester. Result: DTC OUTPUT Display (DTC output) Proceed to Only "P0741" is output A "P0741" and other DTCs B HINT: If any other codes besides "P0741" is output, perform the troubleshooting for those DTCs first. B: GO TO RELEVANT DTC CHART (SEE «DIAGNOSTIC TROUBLE CODE CHART»(ref-225480-S31040901712006031900000) ) A: GO TO NEXT STEP
2. INSPECT SHIFT SOLENOID VALVE (SL) Remove the shift solenoid valve SL. Measure the resistance according to the value(s) in «SHIFT SOLENOID VALVE(SL) CONNECTOR TERMINALS AND BODY GROUND RESISTANCE»(ref-225480-S00255917652006031900000) . Standard: SHIFT SOLENOID VALVE(SL) CONNECTOR TERMINALS AND BODY GROUND RESISTANCE Tester Connection Specified Condition 20°C (68°F) Solenoid Connector (SL) - Solenoid Body (SL) 11 to 15 ohm Connect the positive (+) battery lead to the solenoid connector terminal, and the negative (-) battery lead to the solenoid body for checking the solenoid valve operation. Standard: The solenoid valve makes an operating noise. NG: REPLACE SHIFT SOLENOID VALVE(SL) OK: GO TO NEXT STEP
3. INSPECT TRANSMISSION VALVE BODY ASSY (SEE «TRANSMISSION VALVE BODY ASSY (A245E)»(ref-225506-S04735107412006031900000) ) OK: There are no foreign objects on each valve and they operate smoothly. NG: REPAIR OR REPLACE TRANSMISSION VALVE BODY ASSY OK: GO TO NEXT STEP
4. INSPECT TORQUE CONVERTER CLUTCH ASSY (SEE «TORQUE CONVERTER AND DRIVE PLATE (A245E)»(ref-225506-S17923500612006031900000) ) OK: The torque converter clutch operates normally. NG: REPLACE TORQUE CONVERTER CLUTCH ASSY OK: REPAIR AUTOMATIC TRANSAXLE ASSY (SEE «AUTOMATIC TRANSAXLE ASSY (A245E)»(ref-225506-S11486545152006031900000) )

HINT

Performing the ACTIVE TEST using the hand-held tester allows the relay, VSV, actuator and so on to operate without parts removal. Performing the ACTIVE TEST as the first step of troubleshooting is one method to shorten labor time.

It is possible to display the DATA LIST during the ACTIVE TEST.

1. Turn the ignition switch off.
2. Connect the hand-held tester to the DLC3.
3. Turn the ignition switch to the ON position.
4. Push the "ON" button of the hand-held tester.
5. Select the item "DIAGNOSIS/ENHANCED OBD II/ACTIVE TEST/SHIFT".
6. According to the display on tester, perform the "ACTIVE TEST".

HINT

While driving, the shift position can be forcibly changed with the hand-held tester.

Comparing the shift position commanded by the ACTIVE TEST with the actual shift position enables you to confirm the problem (see FAIL-SAFE CHART ).

Scheme 108

HINT

1. This test can be conducted when the vehicle speed is 50 km/h (31 mph) or less.
2. The shift position commanded by the ECM is shown in the DATA LIST/SHIFT display on the hand-held tester.

Scheme 109

1. CHECK OTHER DTCS OUTPUT (IN ADDITION TO DTC P0751) Connect the OBD II scan tool or the hand-held tester to the DLC3. Turn the ignition switch to the ON position and push the OBD II scan tool or the hand-held tester main switch ON. When you use hand-held tester: Select the item "DIAGNOSIS/ENHANCED OBD II/DTC INFO/CURRENT CODES". Read the DTCs using the OBD II scan tool or the hand-held tester. Result: DTC OUTPUT Display (DTC output) Proceed to Only "P0751" is output A "P0751" and other DTCs B HINT: If any other codes besides "P0751" is output, perform the troubleshooting for those DTCs first. B: GO TO RELEVANT DTC CHART (SEE «DIAGNOSTIC TROUBLE CODE CHART»(ref-225480-S31040901712006031900000) ) A: GO TO NEXT STEP
2. INSPECT SHIFT SOLENOID VALVE (S1) Remove the shift solenoid valve S1. Measure the resistance according to the value(s) in «SHIFT SOLENOID VALVE(S1) CONNECTOR AND BODY GROUND RESISTANCE»(ref-225480-S35260693692006031900000) . Standard: SHIFT SOLENOID VALVE (S1) CONNECTOR AND BODY GROUND RESISTANCE Tester Connection Specified Condition 20°C (68°F) Solenoid Connector (S1) - Solenoid Body (S1) 11 to 15 ohm Connect positive (+) lead to the terminal of solenoid connector, negative (-) lead to the solenoid body. OK: The solenoid makes an operating noise. NG: REPLACE SHIFT SOLENOID VALVE (S1) OK: GO TO NEXT STEP
3. INSPECT TRANSMISSION VALVE BODY ASSY (SEE «TRANSMISSION VALVE BODY ASSY (A245E)»(ref-225506-S04735107412006031900000) ) OK: There are no foreign objects on each valve and they operate smoothly. NG: REPAIR OR REPLACE TRANSMISSION VALVE BODY ASSY OK: REPAIR OR REPLACE AUTOMATIC TRANSAXLE ASSY (SEE «AUTOMATIC TRANSAXLE ASSY (A245E)»(ref-225506-S11486545152006031900000) )

HINT

Performing the ACTIVE TEST using the hand-held tester allows the relay, VSV, actuator and so on to operate without parts removal. Performing the ACTIVE TEST as the first step of troubleshooting is one method to shorten labor time.

It is possible to display the DATA LIST during the ACTIVE TEST.

1. Turn the ignition switch off.
2. Connect the hand-held tester to the DLC3.
3. Turn the ignition switch to the ON position.
4. Push the "ON" button of the hand-held tester.
5. Select the item "DIAGNOSIS/ENHANCED OBD II/ACTIVE TEST/SHIFT".
6. According to the display on tester, perform the "ACTIVE TEST".

HINT

While driving, the shift position can be forcibly changed with the hand-held tester.

Comparing the shift position commanded by the ACTIVE TEST with the actual shift position enables you to confirm the problem (see FAIL-SAFE CHART ).

Scheme 110

HINT

1. This test can be conducted when the vehicle speed is 50 km/h (31 mph) or less.
2. The shift position commanded by the ECM is shown in the DATA LIST/SHIFT display on the hand-held tester.

Scheme 111

1. CHECK OTHER DTCS OUTPUT (IN ADDITION TO DTC P0756) Connect the OBD II scan tool or the hand-held tester to the DLC3. Turn the ignition switch to the ON position and push the OBD II scan tool or the hand-held tester main switch ON. When you use hand-held tester: Select the item "DIAGNOSIS/ENHANCED OBD II/DTC INFO/CURRENT CODES". Read the DTCs using the OBD II scan tool or the hand-held tester. Result: DTC OUTPUT Display (DTC output) Proceed to Only "P0756" is output A "P0756" and other DTCs B HINT: If any other codes besides "P0756" is output, perform the troubleshooting for those DTCs first. B: GO TO RELEVANT DTC CHART (SEE «DIAGNOSTIC TROUBLE CODE CHART»(ref-225480-S31040901712006031900000) ) A: GO TO NEXT STEP
2. INSPECT SHIFT SOLENOID VALVE (S2) Remove the shift solenoid valve S2. Measure the resistance according to the value(s) in «SHIFT SOLENOID VALVE(S2) TERMINALS AND BODY GROUND RESISTANCE»(ref-225480-S01413538512006031900000) . Standard: SHIFT SOLENOID VALVE (S2) TERMINALS AND BODY GROUND RESISTANCE Tester Connection Specified Condition 20°C (68°F) Solenoid Connector (S2) - Solenoid Body (S2) 11 to 15ohm Connect positive (+) lead to the terminal of solenoid connector, negative (-) lead to the solenoid body. OK: The solenoid makes an operating noise. NG: REPLACE SHIFT SOLENOID VALVE (S2) OK: GO TO NEXT STEP
3. INSPECT TRANSMISSION VALVE BODY ASSY (SEE «TRANSMISSION VALVE BODY ASSY (A245E)»(ref-225506-S04735107412006031900000) ) OK: There are no foreign objects on each valve and they operate smoothly. NG: REPAIR OR REPLACE TRANSMISSION VALVE BODY ASSY OK: REPAIR OR REPLACE AUTOMATIC TRANSAXLE ASSY (SEE «AUTOMATIC TRANSAXLE ASSY (A245E)»(ref-225506-S11486545152006031900000) )

Shifting from 1st to O/D is performed in combination with ON and OFF of the shift solenoid valve S1 and S2 controlled by ECM. If an open or short circuit occurs in either of the solenoid valves, the ECM controls the remaining normal solenoid valve to allow the vehicle to be operated smoothly (Fail safe function).

Scheme 112

Shifting from 1st to O/D is performed in combination with ON and OFF of the shift solenoid valve S1 and S2 controlled by ECM. If an open or short circuit occurs in either of the solenoid valves, the ECM controls the remaining normal solenoid valve to allow the vehicle to be operated smoothly (Fail safe function).

Scheme 113

The throttle pressure that is applied to the primary regulator valve (which modulates the line pressure) causes the solenoid valve SLT, under electronic control, to precisely and minutely modulate and generate the line pressure according the extent of the accelerator pedal depressed or the output of engine power.

This controls the line pressure and provides smooth shifting. Upon receiving a signal of the throttle valve opening angle, the ECM controls the line pressure by sending a predetermined (*) duty ratio to the solenoid valve, modulating the line pressure and generating throttle pressure.

(*): Duty Ratio

The duty ratio is the ratio of the period of continuity in one cycle. For example, if A is the period of continuity in one cycle, and B is the period of non-continuity, then Duty Ratio=A/(A+B) x 100 (%)

Scheme 114

Scheme 115

Scheme 116

The shift solenoid valve SL is turned "ON" and "OFF" by signals from the ECM in order to control the hydraulic pressure operation, the lock-up relay valve, which then the controls operation of the lock-up clutch.

Scheme 117

The O/D main switch (transmission control switch) is a momentary type switch. When pressing the O/D main switch, the O/D OFF indicator light lights up and the ECM prohibits shifting into O/D, and when pressing it once again, the O/D OFF indicator light goes off and the ECM allows shifting into O/D. Turning the IG switch OFF will reset the O/D OFF indicator light.

Scheme 118

Scheme 119

Scheme 120

Scheme 121

Scheme 122

Scheme 123

1. CHECK HARNESS AND CONNECTOR (TRANSMISSION CONTROL SWITCH - BODY GROUND) Disconnect the transmission control switch connector of shift lever assy. Measure the resistance according to the value(s) in «TRANSMISSION CONTROL SWITCH CONNECTOR TERMINALS RESISTANCE»(ref-225480-S25678408132006031900000). Standard: TRANSMISSION CONTROL SWITCH CONNECTOR TERMINALS RESISTANCE Tester Connection Specified Condition 4-Body ground Below 1 ohm NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (SEE «ELECTRONIC CIRCUIT INSPECTION PROCEDURE»(ref-225473-S18636529692006031900000) ) OK: GO TO NEXT STEP
2. INSPECT TRANSMISSION CONTROL SWITCH Measure the resistance according to the value(s) in (Scheme 121). Standard: NG: REPLACE TRANSMISSION CONTROL SWITCH OK: GO TO NEXT STEP
3. CHECK HARNESS AND CONNECTOR (TRANSMISSION CONTROL SWITCH - ECM) Connect the transmission control switch connector of shift lever assy. Disconnect the ECM connector. Measure the resistance according to the value(s) in (Scheme 123). Standard: NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (SEE «ELECTRONIC CIRCUIT INSPECTION PROCEDURE»(ref-225473-S18636529692006031900000) ) OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE (SEE «PROBLEM SYMPTOMS TABLE»(ref-225480-S00630620892006031900000) )