Four Wheel Drive Control System (Diagnostics - Introduction): Other Lexus IS III

CAUTION / NOTICE / HINT

HINT

1. Use the following procedure listed to troubleshoot the four wheel drive control 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 to the next step. Result Proceed to NEXT Result: 1 NEXT See step 4
4. CHECK COMMUNICATION FUNCTION OF CAN COMMUNICATION SYSTEM* Use the Techstream to check if the CAN communication system is functioning normally. Refer to «DIAGNOSIS SYSTEM [04/2013 - ]»(ref-665810-S14264089842014102400000) HINT: The ECU of this system is connected to the CAN communication system. Therefore before starting troubleshooting, make sure to check the CAN communication system is functioning normally. Result Result Proceed to CAN DTCs are not output A CAN DTCs are output B Result: 2 B GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING). Refer to «HOW TO PROCEED WITH TROUBLESHOOTING [04/2013 - ]»(ref-665785-S15342612202014102400000) Result: 1 A See step 5
5. CHECK DTC AND FREEZE FRAME DATA* Check for DTCs. Refer to «DTC CHECK/CLEAR [04/2013 - ]»(ref-665560-S17941547592014102400000) Chassis > Four Wheel Drive > Trouble Codes Check for freeze frame data. HINT: Record or print DTCs and freeze frame data if necessary. Clear the DTCs and freeze frame data. Refer to «FREEZE FRAME DATA [04/2013 - ]»(ref-665560-S01650877462014102400000) Chassis > Four Wheel Drive > Clear DTCs Recheck for DTCs. Refer to «DTC CHECK/CLEAR [04/2013 - ]»(ref-665560-S17941547592014102400000) Chassis > Four Wheel Drive > Trouble Codes Simulate the malfunction condition and check if the DTCs are output again. Result Result Proceed to DTCs are not output A DTCs are output B Result: 3 B See step 10 Result: 1 A See step 6
6. PROBLEM SYMPTOMS TABLE Refer to Problem Symptoms Table. Refer to «PROBLEM SYMPTOMS TABLE [04/2013 - ]»(ref-665560-S30874816592014102400000) Result Result Proceed to Fault not listed in problem symptoms table A Fault listed in problem symptoms table B Result: 2 B See step 8 Result: 1 A See step 7
7. OVERALL ANALYSIS AND TROUBLESHOOTING* Terminals of ECU. Refer to «TERMINALS OF ECU [04/2013 - ]»(ref-665560-S00686706322014102400000) Data List/Active Test. Refer to «DATA LIST/ACTIVE TEST [04/2013 - ]»(ref-665560-S10939842302014102400000) Hydraulic test. Refer to «HYDRAULIC TEST [04/2013 - ]»(ref-665560-S23081408592014102400000) Result Proceed to NEXT Result: 1 NEXT See step 8
8. REPAIR OR REPLACE Result Proceed to NEXT Result: 1 NEXT See step 9
9. CONFIRM TEST Result Proceed to NEXT Result: 1 NEXT END
10. GO TO DTC TABLE Refer to «DIAGNOSTIC TROUBLE CODE TABLE [04/2013 - ]»(ref-665560-S20936710382014102400000) Result Proceed to NEXT Result: 1 NEXT See step 8

Scheme 8

1. PERFORM LINE PRESSURE TEST Measure the line pressure. HINT: Perform the test at the normal operating temperature for ATF (Automatic Transmission Fluid): 50 to 80°C (122 to 176°F). The line pressure test should always be carried out with at least 2 people. One technician should observe the conditions of the wheels or wheel chocks outside the vehicle while the other is performing the test. Be careful to prevent the SST hose from contacting the exhaust pipe. This check must be performed after ensuring that the engine is running properly. Perform this test while the A/C is OFF. When performing the stall test, do not continue more than 5 seconds. Warm up the ATF (Automatic Transmission Fluid). Lift the vehicle up. Remove the test plug on the transfer case and connect SST. SST: 09992-00095 (09992-00151, 09992-00271) *a Test Plug (Center Differential) *b Test Plug (Line Pressure) Lower the vehicle. Fully apply the parking brake and chock the 4 wheels. Start the engine and check idling speed. Keep your left foot pressing the brake pedal firmly and move the shift lever to D. Measure the line pressure when the engine is idling. Fully depress the accelerator pedal. Read the highest line pressure as quickly as possible when the engine speed reaches stall speed. In the same manner, perform the test with the shift lever in R. Specified Line Pressure Engine Condition D position MPa (kgf/cm 2 , psi) R position MPa (kgf/cm 2 , psi) 4GR-FSE Idling 0.35 to 0.45 MPa (3.6 to 4.6 kgf/cm 2 , 51 to 65 psi) 0.45 to 0.60 MPa (4.6 to 6.1 kgf/cm 2 , 65 to 87 psi) Stall test 1.20 to 1.40 MPa (12.2 to 14.3 kgf/cm 2 , 174 to 203 psi) 1.60 to 1.85 MPa (16.3 to 18.9 kgf/cm 2 , 232 to 268 psi) 2GR-FSE Idling 0.35 to 0.45 MPa (3.6 to 4.6 kgf/cm 2 , 51 to 65 psi) 0.45 to 0.60 MPa (4.6 to 6.1 kgf/cm 2 , 65 to 87 psi) Stall test 1.25 to 1.45 MPa (12.7 to 14.8 kgf/cm 2 , 181 to 210 psi) 1.45 to 1.70 MPa (14.8 to 17.3 kgf/cm 2 , 210 to 247 psi)
2. PERFORM CENTER DIFFERENTIAL OPERATING HYDRAULIC PRESSURE TEST Measure the center differential operating hydraulic pressure. HINT: Perform the test at the normal operating temperature for ATF (Automatic Transmission Fluid): 50 to 80°C (122 to 176°F). The line pressure test should always be carried out with at least 2 people. One technician should observe the conditions of the wheels or wheel chocks outside the vehicle while the other is performing the test. Be careful to prevent the SST hose from contacting the exhaust pipe. This check must be performed after ensuring that the engine is running properly. Perform this test while the A/C is OFF. When performing the stall test, do not continue more than 5 seconds. Warm up the ATF (Automatic Transmission Fluid). Lift the vehicle up. Remove the test plug on the transfer case and connect SST. SST: 09992-00095 (09992-00151, 09992-00271) *a Test Plug (Center Differential) *b Test Plug (Line Pressure) Lower the vehicle. Fully apply the parking brake and chock the 4 wheels. Start the engine and check idling speed. Keep your left foot pressing the brake pedal firmly and move the shift lever to D. Measure the center differential operating hydraulic pressure when the engine is idling. Fully depress the accelerator pedal. Read the highest center differential operating hydraulic pressure as quickly as possible when the engine speed reaches stall speed. HINT: Begin the test with the steering wheel centered. Specified Center Differential Operating Hydraulic Pressure Engine Condition D position MPa (kgf/cm 2 , psi) 4GR-FSE Idling 0.01 to 0.147 MPa (0.1 to 1.5 kgf/cm 2 , 1.42 to 21.3 psi) Stall test 0.628 to 0.833 MPa (6.4 to 8.5 kgf/cm 2 , 91.0 to 120.8 psi) 2GR-FSE Idling 0.01 to 0.147 MPa (0.1 to 1.5 kgf/cm 2 , 1.42 to 21.3 psi) Stall test 0.628 to 0.833 MPa (6.4 to 8.5 kgf/cm 2 , 91.0 to 120.8 psi) Check that the center differential operating hydraulic pressure drops when the engine reaches stall speed and the steering wheel is turned 140° to the left or right.

INITIALIZATION [04/2013 - ]

1. DESCRIPTION When the 4WD ECU assembly is replaced with a normal one from another vehicle, it is necessary to perform initialization. NOTE: If initialization is not performed, it may affect AWD initial performance (acceleration, etc). When the yaw rate sensor (G sensor) is replaced, it is necessary to perform initialization. HINT: When the 4WD ECU assembly is replaced with a new one, it is not necessary to perform initialization.
2. PERFORM INITIALIZATION Turn the engine switch off. Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Enter the following menus: Chassis / Four Wheel Drive / Utility / Reset Memory. Chassis > Four Wheel Drive > Utility Tester Display Reset Memory Operate the Techstream to clear the data.

FREEZE FRAME DATA [04/2013 - ]

1. FREEZE FRAME DATA When a DTC is stored, the 4WD ECU assembly stores the current vehicle state as Freeze Frame Data. HINT: Freeze Frame Data at the time a DTC is stored: When the 4WD ECU assembly stores data at the time a DTC is stored, no updates will be performed until the data is cleared. "Number of IG ON" is not stored as Freeze Frame Data.
2. CHECK FREEZE FRAME DATA Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Enter the following menus: Chassis / Four Wheel Drive / Trouble Codes. Chassis > Four Wheel Drive > Trouble Codes According to the display on the Techstream, select the trouble code data display with Freeze Frame Data. Chassis > Four Wheel Drive Tester Display Measurement Item Range Normal Condition Diagnostic Note Vehicle Speed Maximum wheel speed sensor reading Min.: 0 km/h (0 mph) Max.: 326 km/h (202 mph) Vehicle stopped: 0 km/h (0 mph) No large fluctuations when driving at a constant speed. FR Wheel Speed Front wheel speed sensor RH reading Min.: 0 km/h (0 mph) Max.: 326 km/h (202 mph) Vehicle stopped: 0 km/h (0 mph) No large fluctuations when driving at a constant speed. FL Wheel Speed Front wheel speed sensor LH reading Min.: 0 km/h (0 mph) Max.: 326 km/h (202 mph) Vehicle stopped: 0 km/h (0 mph) No large fluctuations when driving at a constant speed. RR Wheel Speed Rear wheel speed sensor RH reading Min.: 0 km/h (0 mph) Max.: 326 km/h (202 mph) Vehicle stopped: 0 km/h (0 mph) No large fluctuations when driving at a constant speed. RL Wheel Speed Rear wheel speed sensor LH reading Min.: 0 km/h (0 mph) Max.: 326 km/h (202 mph) Vehicle stopped: 0 km/h (0 mph) No large fluctuations when driving at a constant speed. Accelerator Opening Angle % Accelerator pedal position Min.: 0% Max.: 127% When the accelerator pedal is released: 0% Changes in proportion to the movement of the pedal during accelerator pedal operation. Real Engine Torque Real engine torque Min.: -1024 Nm Max.: 1023 Nm - - Steering Angle Sensor Steering sensor Min.: - 3276.8° Max.: 3276.7° Left turn: Increases Right turn: Decreases - IG1 Voltage Value IG1 voltage value Min.: 0 V Max.: 20 V Engine switch on (IG): 11 to 14 V - Stop Light SW Stop light switch ON or OFF ON: Brake pedal depressed OFF: Brake pedal released - Number of IG ON Number of operations of engine switch being turned on (IG) after storing Freeze Frame Data 0 to 31 0
3. CLEAR FREEZE FRAME DATA NOTE: Clearing the DTCs will also clear the Freeze Frame Data. Connect the Techstream to the DLC3. Turn the engine switch on (IG). Clear the DTCs and Freeze Frame Data. Refer to «DTC CHECK/CLEAR [04/2013 - ]»(ref-665560-S17941547592014102400000) Chassis > Four Wheel Drive > Clear DTCs