Transfer (UF1AE): Diagnosis Lexus IS II

HOW TO PROCEED WITH TROUBLESHOOTING

HINT

The intelligent tester can be used in steps 3 , 4 , 5 , 7 and 11 .

1. VEHICLE BROUGHT TO WORKSHOP NEXT: Go To Next Step
2. CUSTOMER PROBLEM ANALYSIS Confirm problem symptoms. NEXT: Go To Next Step
3. CHECK MULTIPLEX COMMUNICATION SYSTEM Check for DTCs (See «DTC CHECK/CLEAR»(ref-235578-S10348077402006062400000) ). HINT: The 4WD control ECU sends the signals from the indicator light to the gateway ECU via CAN communication, and the gateway ECU sends the signals to the combination meter assembly via the multiplex communication system (BEAN). Result DTC OUTPUT RESULT Result Proceed to DTC is not output A DTC is output B B: CHECK MULTIPLEX COMMUNICATION CIRCUIT A: Go To Next Step
4. CHECK CAN COMMUNICATION SYSTEM Check for DTCs (See «DIAGNOSIS SYSTEM»(ref-235567-S33155034862006062400000) ). HINT: The ECU of this system is connected to the CAN communication system. Therefore before starting troubleshooting, make sure to check that there is no trouble in the CAN communication system. Result DTC OUTPUT RESULT Result Proceed to DTC is not output A DTC is output B B: CHECK CAN COMMUNICATION CIRCUIT A: Go To Next Step
5. CHECK DTC Check for DTCs (See «DTC CHECK / CLEAR»(ref-235567-S06361715992006062400000) ). Record the DTCs. Clear the DTCs. Recheck for DTCs. Reproduce the malfunction and check if the DTCs are output again. Result DTC OUTPUT RESULT Result Proceed to DTC is output A DTC is not output B DTCs are not output, and the malfunction cannot be reproduced or checked C B: GO TO STEP 10 C: SYMPTOM SIMULATION A: Go To Next Step
6. DTC TABLE Go to «DIAGNOSTIC TROUBLE CODE TABLE»(ref-235567-S39415246852006062400000) . NEXT: Go To Next Step
7. CIRCUIT INSPECTION NEXT: Go To Next Step
8. REPAIR NEXT: Go To Next Step
9. CONFIRMATION TEST NEXT: END
10. HYDRAULIC TEST Perform «HYDRAULIC TEST»(ref-235567-S34871066252006062400000) . NG: REPAIR HYDRAULIC CIRCUIT OK: Go To Next Step
11. PROBLEM SYMPTOMS TABLE Go to «PROBLEM SYMPTOMS TABLE»(ref-235567-S21957095582006062400000) . NEXT: Go To Next Step
12. CIRCUIT INSPECTION NEXT: Go To Next Step
13. REPAIR NEXT: Go To Next Step
14. CONFIRMATION TEST NEXT: END

Scheme 35

Scheme 36

1. PERFORM LINE PRESSURE TEST Measure the line pressure. HINT: 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 performed in pairs. 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 SST hose from interfering with 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 the SST. SST 09992-00095 (09992-00231, 09992-00271) 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 the D position. Measure the line pressure when the engine is idling. Depress the accelerator pedal all the way down. 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 the R position. Specified line pressure: LINE PRESSURE SPECIFICATIONS Condition D position MPa (kgf/cmgf 2 , psi) R position MPa (kgf/cm 2 , psi Idling 0.3 to 0.42 MPa (3.7 to 4.3 kgf/cm 2 , 52.6 to 61.1 psi) 0.49 to 0.58 MPa (5.0 to 5.9 kgf/cm 2 , 71.1 to 83.9 psi) Stall test 1.05 to 1.15 MPa (10.7 to 11.7 kgf/cm 2 , 152.1 to 166.4 psi) 1.19 to 1.38 MPa (12.1 to 14.1 kgf/cm 2 , 172.0 to 200.5 psi)
2. PERFORM CENTER DIFFERENTIAL OPERATING HYDRAULIC PRESSURE TEST Measure the center differential operating hydraulic pressure. HINT: 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 performed in pairs. 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 SST hose from interfering with 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 the SST. SST 09992-00095 (09992-00231, 09992- 00271) 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 the D position. Measure the line pressure when the engine is idling. Depress the accelerator pedal all the way down. Read the highest line pressure as quickly as possible when the engine speed reaches stall speed. Specified line pressure: LINE PRESSURE SPECIFICATIONS Condition D position MPa (kgf/cm 2 , psi 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) HINT: Begin the test with the steering wheel centered. 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.

PROBLEM SYMPTOMS TABLE

HINT

If a normal system code is displayed during the DTC check but the problem still occurs, check the circuits for each problem symptom in the order given in PROBLEM SYMPTOMS TABLE and proceed to the relevant troubleshooting reference.

FOUR WHEEL DRIVE CONTROL SYSTEM

PROBLEM SYMPTOMS TABLE

DATA LIST / ACTIVE TEST

HINT

By accessing the DATA LIST displayed on the intelligent tester, you can perform such functions as reading the values of switches and sensors without removing any parts. Reading the DATA LIST is the first step in troubleshooting and is one method to shorten labor time.

1. DATA LIST OF 4WD CONTROL ECU Connect the intelligent tester to the DLC3. Turn the engine switch on (IG). Following the display on the intelligent tester, select "DATA LIST". DATA LIST REFERENCE Item Measurement Item/ Range (Display) Normal Condition Diagnostic Note 4WD WARN LAMP 4WD Indicator Light / OFF or ON OFF: 4WD indicator light off ON: 4WD indicator light on - SLIP INDI LAMP Slip Indicator Light / OFF or ON OFF: SLIP indicator light off ON: SLIP indicator light on - STOP LAMP SW Stop Light Switch / OFF or ON OFF: Brake pedal released ON: Brake pedal depressed - STEERING ANGLE Steering Angle Value / Min.: -3276.8 deg, Max.: 3276.7 deg Left: -3276.8 deg Center: Approx. 0 deg Right: 3276.7 deg - FR WHEEL SPD FR Wheel Speed / Min.: 0 mph (0 km/h), Max.: 202 mph (326.4 km/h) Min.: 0 mph (0 km/h), Max.: 202 mph (326.4 km/h) Almost no difference from the speedometer FL WHEEL SPD FL Wheel Speed / Min.: 0 mph (0 km/h), Max.: 202 mph (326.4 km/h) Min.: 0 mph (0 km/h), Max.: 202 mph (326.4 km/h) Almost no difference from the speedometer RR WHEEL SPD RR Wheel Speed / Min.: 0 mph (0 km/h), Max.: 202 mph (326.4 km/h) Min.: 0 mph (0 km/h), Max.: 202 mph (326.4 km/h) Almost no difference from the speedometer RL WHEEL SPD RL Wheel Speed / Min.: 0 mph (0 km/h), Max.: 202 mph (326.4 km/h) Min.: 0 mph (0 km/h), Max.: 202 mph (326.4 km/h) Almost no difference from the speedometer SLC CUR SLC Solenoid (transfer control solenoid) Current / Min.: 0 A Max.: 1 A Min.: 0 A Max.: 1 A - #DTC Number of DTCs / 0 to 255 0 to 255
2. ACTIVE TEST OF 4WD CONTROL

HINT

Performing the ACTIVE TEST using the intelligent tester allows the relay, actuator, etc. to operate without removing any parts. Performing the ACTIVE TEST as the first step in troubleshooting is one way to shorten labor time. It is possible to display the DATA LIST during the ACTIVE TEST.

1. Connect the intelligent tester to the DLC3.
2. Turn the engine switch on (IG).
3. Following the display on the intelligent tester, select "ACTIVE TEST".

ACTIVE TEST REFERENCE

DIAGNOSTIC TROUBLE CODE TABLE

FOUR WHEEL DRIVE CONTROL SYSTEM

DIAGNOSTIC TROUBLE CODE TABLE

INSPECTION PROCEDURE

1. CHECK TIRE CONDITION Check the size and condition of all 4 tires (See «INSPECTION»(ref-235571-S20728357352006062400000) ). HINT: This DTC is output when tire deformation or a difference in tire size is detected. OK: The diameter and air pressure of all 4 tires are the same. NG: REPLACE TIRES SO THAT ALL 4 TIRES ARE THE SAME SIZE A: Go To Next Step
2. READ VALUE OF INTELLIGENT TESTER Connect the intelligent tester to the DLC3. Start the engine. Select the "DATA LIST" on the intelligent tester (See «DATA LIST / ACTIVE TEST»(ref-235567-S41947801432006062400000) ). Check that the speed values detected at all four wheels displayed on the intelligent tester are the same when driving the vehicle. DATA LIST: 4WD DATA LIST REFERENCE (4WD) Item Measurement Item / Range (Display) Normal Condition FR WHEEL SPD Wheel speed sensor (FR) reading / min.: 0 mph (0 km/h), max.: 202 mph (326.4 km/h) Actual wheel speed FL WHEEL SPD Wheel speed sensor (FL) reading / min.: 0 mph (0 km/h), max.: 202 mph (326.4 km/h) Actual wheel speed RR WHEEL SPD Wheel speed sensor (RR) reading / min.: 0 mph (0 km/h), max.: 202 mph (326.4 km/h) Actual wheel speed RL WHEEL SPD Wheel speed sensor (RL) reading / min.: 0 mph (0 km/h), max.: 202 mph (326.4 km/h) Actual wheel speed OK: The speed of all four wheels displayed on the intelligent tester should match. NG: CHECK SPEED SIGNAL CIRCUIT OK: Go To Next Step
3. RECONFIRM DTC Clear the DTC (See «DTC CHECK / CLEAR»(ref-235567-S06361715992006062400000) ). Turn the engine switch off. Start the engine. Drive the vehicle at the speed of 12 mph (20 km/h) or more and check if the same DTC is output. Result DTC OUTPUT RESULT Result Proceed to DTC is output A DTC is not output B B: CHECK INTERMITTENT PROBLEMS A: REPLACE 4WD CONTROL ECU

Go to CAN communication system for troubleshooting (See SYSTEM DESCRIPTION ).

HINT

When DTCs indicating a CAN communication system malfunction are output, repair the CAN communication system before repairing each corresponding sensor.

INSPECTION

1. INSPECT TRANSFER WIRE Disconnect the transfer wire connector. Measure the resistance according to the value(s) in «RESISTANCE SPECIFIED CONDITION TABLE»(ref-235567-S31902366582006062400000) .

Standard resistance

RESISTANCE SPECIFIED CONDITION TABLE

Scheme 37

If the resistance is not specified, replace the transfer wire.

Scheme 38

Scheme 39

Scheme 40

Scheme 41

Scheme 42

Scheme 43

Scheme 44

1. INSTALL TRANSFER WIRE Coat the transfer wire O-ring with ATF. Install the transfer wire with the bolt. Torque: 5.4 N*m (55 kgf*cm, 48 in.*lbf) Connect the 2 transfer wire connectors to the transfer control solenoid. Install the transfer upper valve body with the 4 bolts. Torque: 9.8 N*m (100 kgf*cm, 87 in.*lbf)
2. INSTALL TRANSFER OIL PAN Install the transfer oil cleaner magnet to the transfer oil pan. Remove all residual FIPG material from the contact surfaces using gasoline or alcohol. Apply seal packing to the transfer chain case front (Scheme 41) Seal packing: Part No. 08826-00090, THREE BOND or equivalent Temporarily tighten the 9 bolts in several steps, and then tighten them to the specified torque. Torque: 7.4 N*m (75 kgf*cm, 65 in.*lbf)
3. INSTALL TRANSFER DYNAMIC DAMPER Install the transfer dynamic damper with the 2 bolts. Torque: 52 N*m (530 kgf*cm, 38 ft.*lbf)
4. INSTALL ENGINE REAR MOUNTING MEMBER Install the engine rear mounting member with the 4 bolts and 3 nuts. Torque: 26 N*m (265 kgf*cm, 19 ft.*lbf) (Bolt) 38 N*m (387 kgf*cm, 28 ft.*lbf) (Nut)
5. INSTALL FRONT NO. 1 FLOOR HEAT INSULATOR (See Step 3 in «INSTALLATION»(ref-235561-S12063571302006062400000) )
6. INSTALL FRONT EXHAUST PIPE ASSEMBLY (See Step 4 in «INSTALLATION»(ref-263470-S09129366372007090600000) )
7. INSTALL HEATED OXYGEN SENSOR (See Step 5 or 6 in «INSTALLATION»(ref-263470-S09129366372007090600000) )
8. INSTALL FRONT CENTER FLOOR BRACE (See Step 7 in «INSTALLATION»(ref-263470-S09129366372007090600000) )
9. INSTALL REAR NO. 1 FLOOR PANEL BRACE (See Step 8 in «INSTALLATION»(ref-263470-S09129366372007090600000) )
10. ADD AUTOMATIC TRANSMISSION FLUID (See «AUTOMATIC TRANSMISSION (A760H)»(ref-235560) or «AUTOMATIC TRANSMISSION (A960E)»(ref-235566) )
11. CHECK FOR EXHAUST GAS LEAKS

Scheme 45

Scheme 46

Scheme 47

Scheme 48

1. REMOVE FRONT DOOR SCUFF PLATE RH (w/o Illumination) HINT: Use the same procedures for the RH side and the LH side (See Step 34 in «REMOVAL»(ref-235591-S20751754672006062400000) ).
2. REMOVE FRONT DOOR SCUFF PLATE RH (w/ Illumination) HINT: Use the same procedures for the RH side and the LH side (See Step 35 in «REMOVAL»(ref-235591-S20751754672006062400000) ).
3. REMOVE FRONT DOOR OPENING TRIM COVER RH (See Step 36 in «REMOVAL»(ref-235591-S20751754672006062400000) )
4. REMOVE SIDE INSTRUMENT PANEL RH (See Step 37 in «REMOVAL»(ref-235591-S20751754672006062400000) )
5. REMOVE NO. 2 INSTRUMENT PANEL UNDER COVER SUB-ASSEMBLY (See Step 38 in «REMOVAL»(ref-235591-S20751754672006062400000) )
6. REMOVE 4WD CONTROL ECU Turn back the front floor carpet assembly. Disengage the 2 clips and separate the junction connector. Remove the bolt and nut. Disconnect the clamp and connector, and remove the 4WD control ECU.

Scheme 49

Scheme 50

Scheme 51

1. INSTALL 4WD CONTROL ECU Connect the connector and clamp to the 4WD control ECU. Install the 4WD control ECU with the bolt and nut. Torque: Bolt 14 N*m (137 kgf*cm, 10 ft.*lbf) Nut 6.0 N*m (61 kgf*cm, 54 in.*lbf) Connect the junction connector with the 2 clips.
2. INSTALL NO. 2 INSTRUMENT PANEL UNDER COVER SUB-ASSEMBLY (See Step 16 in «INSTALLATION»(ref-235591-S32740741772006062400000) )
3. INSTALL SIDE INSTRUMENT PANEL RH (See Step 17 in «INSTALLATION»(ref-235591-S32740741772006062400000) )
4. INSTALL FRONT DOOR OPENING TRIM COVER RH (See Step 18 in «INSTALLATION»(ref-235591-S32740741772006062400000) )
5. INSTALL FRONT DOOR SCUFF PLATE RH (w/o Illumination) HINT: Use the same procedures for the RH side and the LH side (See Step 19 in «INSTALLATION»(ref-235591-S32740741772006062400000) ).
6. INSTALL FRONT DOOR SCUFF PLATE RH (w/ Illumination)

HINT

Use the same procedures for the RH side and the LH side (See Step 20 in INSTALLATION ).