Variable Gear Ratio Steering (Diagnostics - Introduction): Diagnosis Lexus LX J200

HOW TO PROCEED WITH TROUBLESHOOTING

HINT

1. Use the following procedures to troubleshoot the variable gear ratio steering system.
2. *: Use the Techstream.

1. VEHICLE BROUGHT TO WORKSHOP NEXT: Go to next step
2. INSPECT BATTERY VOLTAGE Standard voltage 11 to 14 V If the voltage is below 11 V, recharge or replace the battery before proceeding. NEXT: Go to next step
3. CHECK CAN COMMUNICATION SYSTEM* Using the Techstream, check if the CAN communication system is functioning normally. Refer to «DIAGNOSIS SYSTEM»(ref-385222-S33412669092011021400000) . RESULT Result Proceed to DTC is not output A DTC is output B B --> GO TO CAN COMMUNICATION SYSTEM (DIAGNOSTIC TROUBLE CODE CHART). Refer to «DIAGNOSTIC TROUBLE CODE CHART»(ref-385222-S04985080032011021400000) A: Go to next step
4. CHECK DTC* Check for DTCs. Refer to «DTC CHECK / CLEAR»(ref-385244-S06342001682011021400000) . Clear the DTCs. Refer to «DTC CHECK / CLEAR»(ref-385244-S06342001682011021400000) . Recheck for DTCs. Refer to «DTC CHECK / CLEAR»(ref-385244-S06342001682011021400000) . Simulate the malfunction and check if the DTCs are output again. Refer to «DTC CHECK / CLEAR»(ref-385244-S06342001682011021400000) . RESULT Result Proceed to DTC is output A DTC is not output B DTCs are not output, and the malfunction cannot be simulated or checked. C B --> GO TO STEP 9 C --> SYMPTOM SIMULATION A: Go to next step
5. DTC CHART NEXT: Go to next step
6. CIRCUIT INSPECTION NEXT: Go to next step
7. REPAIR NEXT: Go to next step
8. CONFIRMATION TEST NEXT --> END
9. PROBLEM SYMPTOMS TABLE NEXT: Go to next step
10. CIRCUIT INSPECTION NEXT: Go to next step
11. CONFIRMATION TEST NEXT --> END

Scheme 5

1. STEERING ANGLE SENSOR INITIALIZATION (to obtain a tire angle (during straight-ahead driving) signal) Turn the engine switch on (IG), and check that the master warning light illuminates for a few seconds. NOTE: If the warning light remains on, repair the applicable system. Drive the vehicle on a straight road at 35 km/h (22 mph) or more for 5 seconds or more. HINT: At this point, the steering wheel will still remain off-center by 5 to 10°. In this step, the neutral position of the steering wheel is restored from the steering control ECU memory. Confirm that steering angle sensor initialization is completed (using the Techstream). Enter the VGRS menu using the Techstream. Select "Straight Angle Valid Flag" from "Data List". Check if the steering angle sensor has obtained a tire angle (during straight-ahead driving) signal. Standard "Valid" is displayed on the Techstream screen. Confirm that steering angle sensor initialization is completed (not using the Techstream). Stop the vehicle (engine running). Slowly turn the steering wheel from lock to lock. If it turns approximately 2.7 turns, steering angle sensor initialization is completed. If it turns approximately 3.2 turns, steering angle sensor initialization is not completed. NOTE: If the steering wheel turns approximately 3.2 turns, drive the vehicle on a straight road at 35 km/h (22 mph) or more for 5 seconds or more. Then confirm the initialization again.

PROBLEM SYMPTOMS TABLE

HINT

1. Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each symptom by checking the suspected areas in the order they are listed. Replace parts as necessary.
2. Inspect the fuses and relays related to this system before inspecting the suspected areas below.

VARIABLE GEAR RATIO STEERING SYSTEM

Scheme 6

1. CHECK STEERING CONTROL ECU HINT: Inspect the connectors from the back side while they are connected. Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition E82-3 (IG) - E82-7 (PGND) G - W-B Power supply (ECU-IG No. 4 fuse) Engine switch on (IG) 11 to 14 V E82-7 (PGND) - Body ground W-B - Body ground Ground Always Below 1 ohms E82-8 (PIG) - E82-7 (PGND) B - W-B Power supply (VGRS fuse) Always 11 to 14 V E82-10 (+B1) - E82-7 (PGND) R - W-B Power supply (ECU-B1 fuse) Always 11 to 14 V E83-1 (BMV) - E82-7 (PGND) W - W-B Steering actuator motor signal (V phase) Engine running Sine wave E83-2 (BMU) - E82-7 (PGND) B - W-B Steering actuator motor signal (U phase) Engine running Sine wave E83-3 (BMW) - E82-7 (PGND) R - W-B Steering actuator motor signal (W phase) Engine running Sine wave E83-6 (SG) - E83-8 (PGD2) BR - W-B Steering actuator motor signal shielded ground Always Below 1 ohms E83-8 (PGD2) - Body ground W-B - Body ground Steering control ECU ground Always Below 1 ohms E84-1 (+BO) - E82-7 (PGND) R - W-B Steering angle sensor power supply line Always 11 to 14 V E84-3 (LV) - E82-7 (PGND) B - W-B Power source for steering actuator lock Engine switch on (IG) 11 to 14 V E84-4 (S1) - E82-7 (PGND) R - W-B Steering actuator motor rotation angle sensor signal Engine switch on (IG) Sine wave E84-6 (RV) - E82-7 (PGND) W- W-B Steering actuator resolver excitation output voltage Engine switch on (IG) Sine wave E84-7 (SIL) - E82-7 (PGND) R - W-B Diagnostic communication signal Engine switch on (IG) Pulse generation E84-9 (CANH) - E84-20 (CANL) LG - L CAN communication Engine switch on (IG) Pulse generation E84-10 (SS1-) - E82-7 (PGND) GR - W-B Steering angle sensor signal Engine running and steering wheel turned Pulse generation E84-12 (LG) - E82-7 (PGND) Y - W-B Steering actuator lock ground Engine running Pulse generation E84-14 (S2) - E82-7 (PGND) L - W-B Steering actuator motor rotation angle sensor signal Engine switch on (IG) Sine wave E84-15 (RG) - E82-7 (PGND) G - W-B Steering actuator resolver common ground Always Below 1 ohms E84-16 (SG2+) - E82-7 (PGND) Shielded - W-B Shielded ground wire for steering actuator motor rotation angle sensor signal wire and control signal wire Engine switch on (IG) Pulse generation E84-19 (SS1+) - E82-7 (PGND) L - W-B Steering angle sensor signal Engine running and steering wheel turned 3 to 4 V

Scheme 7

1. FUNCTION OF WARNING LIGHT AND MESSAGE If a malfunction occurs during system operation, the master warning light on the combination meter comes on and "Check VGRS System" will be displayed on the multi-information display to inform the driver of the system malfunction.
2. DTC Normal mode. DTCs are stored in the steering control ECU and read using the Techstream. Refer to «DTC CHECK / CLEAR»(ref-385244-S06342001682011021400000) . Test mode. By switching from normal mode to test mode, the steering angle sensor can be inspected. Refer to «TEST MODE PROCEDURE»(ref-385244-S09289909322011021400000) . HINT: Whether the system is in normal mode or test mode can be checked from the indication on the multi-information display. For details of the indication and how to check, refer to "DTC Check/Clear". Refer to «DTC CHECK / CLEAR»(ref-385244-S06342001682011021400000) .
3. CHECK MASTER WARNING LIGHT Turn the engine switch on (IG). Check that the master warning light comes on for 2 seconds. HINT: If the master warning light (VGRS) check result is not normal, proceed to troubleshooting of the warning light circuit. Trouble Area See Procedure Master warning light circuit Refer to «Master Warning Light Malfunction»(ref-385253-S24071319972011021400000)

Scheme 8

Scheme 9

Scheme 10

1. CHECK DTC (Using Techstream) Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Enter the following menus: Chassis / VGRS / Trouble Codes. Read the DTCs.
2. CLEAR DTC (Using Techstream) Connect the Techstream to the DLC3. Turn the engine switch on (IG) (do not start the engine). Turn the Techstream on. Enter the following menus: Chassis / VGRS / Trouble Codes. Clear the DTCs.
3. CHECK DTC (Using SST Check Wire) HINT: The master warning light comes on in diagnostic mode. Using SST check wire, connect terminals 13 (TC) and 4 (CG) of the DLC3. SST: 09843-18040 Turn the engine switch on (IG). "DIAG VGRS" is displayed on the multi-information display and the system starts searching for a malfunction. If the system is normal, "DIAG VGRS OK" is displayed. If the system has a malfunction, "DIAG VGRS xx" is displayed ("xx" is a 2-digit DTC).
4. CLEAR DTC (Using SST Check Wire) Turn the engine switch on (IG). Using SST check wire, connect and disconnect terminals 13 (TC) and 4 (CG) of the DLC3 4 times within 8 seconds. SST: 09843-18040 Disconnect SST check wire from the DLC3. NOTE: As the stored yaw rate and G sensor value will be cleared by the above operation, it is necessary to obtain the yaw rate and G sensor zero point. Turn the engine switch off. HINT: If the problem still exists, DTCs may not be cleared. Obtain the yaw rate and G sensor zero point. Refer to «CALIBRATION»(ref-385226-S30375027272011021400000) .

DATA LIST / ACTIVE TEST

HINT

Using the Techstream to read the Data List allows the values or states of switches, sensors, actuators and other items to be read without removing any parts. This non-intrusive inspection can be very useful because intermittent conditions or signals may be discovered before parts or wiring is disturbed. Reading the Data List information early in troubleshooting is one way to save diagnostic time.

Note. In the table below, the values listed under "Normal Condition" are reference values. Do not depend solely on these reference values when deciding whether a part is faulty or not.

1. READ DATA LIST Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Enter the following menus: Chassis / VGRS / Data List. According to the display on the Techstream, read the Data List. VGRS Tester Display Measurement Item/Range Normal Condition Diagnostic Note Vehicle Speed (Vsc ECU) Vehicle speed (Skid control ECU)/ Min.: 0 km/h (0 mph), Max.: 255 km/h (158 mph) Actual vehicle speed (Speed indicated on speedometer) - Engine ReVolution (Rpm) Engine speed (rpm)/ Less than 300 or 300 or more Engine stopped: Less than 300 rpm Engine running: 300 rpm or more - Mtr Power Source Cur. Motor power source actual current/ Min.: 0 A, Max.: 127.5 A Steering wheel not turned: Below 1 A Steering wheel turned: 1 A or higher - PIG-Power Source Volt PIG power source voltage/ Min.: 0 V, Max.: 25.5 V Engine switch on (IG): 11 to 14 V - IG-Power Source Volt IG power source voltage/ Min.: 0 V, Max.: 25.5 V Engine switch on (IG): 11 to 14 V - Terminal Voltage U Terminal voltage U/ Min.: 0 V, Max.: 25.5 V VGRS system operating: 0 to 16 V VGRS system not operating: 0 V Turning the steering wheel changes the value (with the engine running and the VGRS system operating). Terminal Voltage V Terminal voltage V/ Min.: 0 V, Max.: 25.5 V VGRS system operating: 0 to 16 V VGRS system not operating: 0 V Turning the steering wheel changes the value (with the engine running and the VGRS system operating). Terminal Voltage W Terminal voltage W/ Min.: 0 V, Max.: 25.5 V VGRS system operating: 0 to 16 V VGRS system not operating: 0 V Turning the steering wheel changes the value (with the engine running and the VGRS system operating). Lock Motor Output Volt Lock motor output voltage/ Min.: 0 V, Max.: 25.5 V Engine switch on (IG): 11 to 14 V - Thermistor Temperature Thermistor temperature/ Min.: -50°C (-58°F), Max.: 205°C (419°F) - - Command Value Duty Command duty value for PVM control/ Min.: 0%, Max.: 100% VGRS system operating: 0 to 100% VGRS system not operating: 0% - Actuator Lock Duty Val Command duty value for actuator lock control/ Min.: 0%, Max.: 100% Engine switch on (IG): Below 10% - Straight Angle Valid Flag*1 Straight steering angle valid flag/ Valid or Invalid Steering angle sensor zero point calibrated: Valid Steering angle sensor zero point not calibrated: Invalid - Actuator Estimate Temp Actuator estimated temperature/ Min.: -50°C (-58°F), Max.: 205°C (419°F) - - Motor Overheat Record*2 Record of continuous overheat preventive control/ Rec or Unrec Rec or Unrec - Motor Lo Power Record*2 Record of low motor power source voltage/ Rec or Unrec Rec or Unrec - Motor Over load Record*2 Record of high motor power source voltage/ Rec or Unrec Rec or Unrec - The Number of DTCs The number of DTCs/ Max.: 0, Min.: 255 0 to 255 - Test Mode Status Test mode status/ Normal mode or Test mode Normal mode status: Normal mode Test mode status: Test mode - Steering Mode Absorber control switch (AVS switch) position/ Sports or Normal Absorber control switch position SPORT: Sports Absorber control switch position NORM: Normal - Elec Angle Position Deep-slot electric angle position recorded when actuator angle neutral point adjustment completed normally/ Min.: 0°, Max.: 360° - - Resolver Offset(SIN) Resolver offset (SIN)/ Min.: 0, V Max.: 25.5 V Steering wheel turned: 0 to 16 V Steering wheel not turned: 0 V - Resolver Offset(COS) Resolver offset (COS)/ Min.: 0, V Max.: 25.5 V Steering wheel turned: 0 to 16 V Steering wheel not turned: 0 V - Motor Current U Motor current U/ Min.: -63 A, Max.: 64.5 A Steering wheel turned: 0 to 64.5 A Steering wheel not turned: 0 A - Motor Current V Motor current V/ Min.: -63 A, Max.: 64.5 A Steering wheel turned: 0 to 64.5 A Steering wheel not turned: 0 A - Motor Current W Motor current W/ Min.: -63 A, Max.: 64.5 A Steering wheel turned: 0 to 64.5 A Steering wheel not turned: 0 A - Motor Voltage Motor voltage/ Min.: 0 V, Max.: 51 V VGRS system operating: 9 to 36 V VGRS system not operating: 0 V - Steering Pos 1 Steering position/ Min.: -2047 deg., Max.: 2048.94 deg. Steering wheel turned to right: Display value changes in negative direction Steering wheel turned to left: Display value changes in positive direction - Steering Pos 2 Steering position/ Min.: -49150.5 deg., Max.: 49152 deg. Steering wheel turned to right: Display value changes in negative direction Steering wheel turned to left: Display value changes in positive direction - Actuator Position Actuator position/ Min.: -2047 deg., Max.: 2048.94 deg. Steering wheel turned: -2047 to 2048.94 deg. - Steering Angle Velocity Steering angle velocity/ Min.: -2047 deg./s, Max.: 2048.94 deg./s Steering wheel turned to right: Display value changes in negative direction Steering wheel turned to left: Display value changes in positive direction - Actuator Target Angle 1 Actuator target angle 1/ Min.: -2047 deg., Max.: 2048.94 deg. Steering wheel turned: -2047 to 2048.94 deg. - Actuator Target Angle 2 Actuator target angle 2/ Min.: -2047 deg., Max.: 2048.94 deg. Steering wheel turned: -2047 to 2048.94 deg. - Actuator ReVolution Spd Actuator revolution speed/ Min.: -2047 deg./s, Max.: 2048.94 deg./s Steering wheel turned to right: Display value changes in negative direction Steering wheel turned to left: Display value changes in positive direction - Actuator Deviation Ang Actuator deviation angle/ Min.: -32 rad., Max.: 32 rad. VGRS system operating: -32 to 32 rad. - Mode State Mode state/ 00, 01, 02, 03, 04, 05, 06, 07, 08, 09, 0A, 0B, 0C, 0D, 0E, 0F or 10 - - NOTE: *1: This data must be "Valid" before proceeding with any steering adjustment. If "Invalid" is displayed, perform the steering angle sensor initialization procedure. If the steering actuator or steering control ECU has been replaced, perform VGRS system calibration (steering angle adjustment). HINT: *2: If "Rec" is displayed, enter the VGRS menu on the Techstream, select record clearance, and follow the prompts to set to "Unrec".
2. ACTIVE TEST HINT: Using the Techstream to perform Active Tests allows relays, VSVs, actuators and other items to be operated without removing any parts. This non-intrusive functional inspection can be very useful because intermittent operation may be discovered before parts or wiring is disturbed. Performing Active Tests early in troubleshooting is one way to save diagnostic time. Data List information can be displayed while performing Active Tests. Connect the Techstream to the DLC3. Turn the engine switch on (IG). Turn the Techstream on. Enter the following menus: Body Electrical / Combination meter / Active Test. According to the display on the Techstream, perform the Active Test. COMBINATION METER: Tester Display Test Part Control Range Diagnostic Note Master Warning Master warning light OFF/ON Confirm that the vehicle is stopped and the engine is running.

DIAGNOSTIC TROUBLE CODE CHART

HINT

If a trouble code is output during the DTC check, inspect the trouble areas listed for that code. For details of the code, refer to the table below.