Adaptive Variable Suspension System (Diagnostics - Introduction): Diagnosis Lexus GS III рестайлинг

HOW TO PROCEED WITH TROUBLESHOOTING

HINT

1. Use these procedures to troubleshoot the adaptive variable suspension system.
2. *: Use 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 MULTIPLEX COMMUNICATION SYSTEM* Check the DTC. Refer to «DTC CHECK / CLEAR»(ref-386964-S15748959292011022400000) . RESULT Result Proceed to DTC is not output A DTC is output B B --> CHECK MULTIPLEX COMMUNICATION SYSTEM A: Go to next step
4. CHECK CAN COMMUNICATION SYSTEM* Check the DTC. Refer to «DTC CHECK / CLEAR»(ref-386964-S15748959292011022400000) . RESULT Result Proceed to DTC is not output A DTC is output B B --> CHECK CAN COMMUNICATION CIRCUIT A: Go to next step
5. WARNING LIGHT CHECK NEXT: Go to next step
6. CHECK DTC* Check the DTC. Refer to «DTC CHECK / CLEAR»(ref-386964-S15748959292011022400000) . RESULT Result Proceed to DTC is not output A DTC is output B B --> «PROBLEM SYMPTOMS TABLE»(ref-386964-S37617294672011022400000) A: Go to next step
7. DTC CHART NEXT: Go to next step
8. CIRCUIT INSPECTION NEXT: Go to next step
9. REPAIR NEXT: Go to next step
10. CLEAR DTC* NEXT: Go to next step
11. CHECK DTC* Check the DTC. Refer to «DTC CHECK / CLEAR»(ref-386964-S15748959292011022400000) . RESULT Result Proceed to DTC is not output A DTC is output B B --> Go to step 6 A: Go to next step
12. CONFIRMATION TEST NEXT --> END

Scheme 1

Scheme 2

Scheme 3

1. CHECK ABSORBER CONTROL ACTUATOR OPERATION Using SST, connect the terminals 12 (TS) and 4 (CG) of the DLC3. SST: 09843-18040 Turn the power switch ON (READY). Check that the absorber control indicator light is blinking in Test Mode. HINT: If the absorber control indicator light does not blink, inspect the absorber control indicator light circuit and TS and CG terminal circuit. Trouble area See procedure Absorber control indicator light (Remains on) Refer to «Absorber Control Indicator Light Remains ON»(ref-386965-S41770903562011022400000) Absorber control indicator light (Does not come on) Refer to «Absorber Control Indicator Light does not Come ON»(ref-386965-S04291518712011022400000) TS and CG terminal circuit Refer to «TS and CG Terminal Circuit»(ref-386965-S02923345572011022400000) Check absorber control actuator operation. Starting from the SOFT position, depress the brake pedal. Using Techstream, check that the absorber control actuator position increases by 2 steps each time the brake pedal is depressed (1 (SOFT) --> 3 --> 5 --> 7 --> 9 --> 11 --> 15 --> 17 (HARD)). At this time, bounce the vehicle and check that the shock absorber is becoming harder. HINT: Every time the brake pedal is depressed, the absorber control actuator rotates in the hard to soft direction in 15° intervals up to a maximum angle of 120°. To hold the absorber control actuator at a specific position, adjust it using the above mentioned procedure, then increase the vehicle speed to 5 km/h (3 mph). After that, the absorber control actuator position does not change until the power switch is turned OFF. If the absorber control actuator does not operate, inspect the absorber control actuator circuit and absorber control actuator installation condition. Trouble area See procedure Absorber control actuator circuit Refer to «DTC C1725: Front Damping Force Control Actuator RH Circuit; DTC C1726: Front Damping Force Control Actuator LH Circuit; DTC C1727: Rear Damping Force Control Actuator RH Circuit; DTC C1728: Rear Damping Force Control Actuator LH Circuit»(ref-386965-S13505263942011022400000) Absorber control actuator installation condition Refer to «INSPECTION»(ref-386957-S19213369342011022400000) Refer to «INSPECTION»(ref-386957-S10922349492011022400000) Turn the power switch OFF. Disconnect SST from terminal 12 (TS) and 4 (CG) of the DLC3. Turn the power switch ON (IG). HINT: If the power switch remains ON (IG) after SST is removed from DLC3, the vehicle will remain in the previously initialized Test Mode.

Scheme 4

Scheme 5

1. INDICATOR LIGHT CHECK When the power switch is turned ON (IG), check that the absorber control indicator light will come on for approximately 2 seconds. (Absorber control switch is in the "NORM" position.) HINT: If the absorber control ECU stores any DTCs, the absorber control indicator light will come on. If the absorber control indicator light remains on or does not come on, proceed to troubleshooting for the indicator light circuit below. Trouble area See procedure Absorber control indicator light (Remains on) Refer to «Absorber Control Indicator Light Remains ON»(ref-386965-S41770903562011022400000) Absorber control indicator light (Does not come on) Refer to «Absorber Control Indicator Light does not Come ON»(ref-386965-S04291518712011022400000)
2. SENSOR SIGNAL CHECK BY TEST MODE (SIGNAL CHECK) HINT: If the power switch is turned from ON (IG) to ON (ACC) or OFF during Test Mode (SIGNAL CHECK), all Test Mode DTCs will be erased. During Test Mode (SIGNAL CHECK), the absorber control ECU records all Test Mode DTCs. By performing the Test Mode (SIGNAL CHECK), the codes will be erased if normality is confirmed. The remaining codes will be the codes where an abnormality was found. Procedure for Test Mode. Turn the power switch OFF. Connect Techstream to the DLC3. Turn the power switch ON (IG). Set Techstream to Test Mode (select "SIGNAL CHECK"). HINT: Refer to the Techstream operator's manual for further details. Turn the power switch ON (READY). Check that the absorber control indicator light is blinking in Test Mode. HINT: If the absorber control indicator light does not blink, inspect the absorber control indicator light circuit. Trouble area See procedure Absorber control indicator light (Remains on) Refer to «Absorber Control Indicator Light Remains ON»(ref-386965-S41770903562011022400000) Absorber control indicator light (Does not come on) Refer to «Absorber Control Indicator Light does not Come ON»(ref-386965-S04291518712011022400000)
3. PERFORM SIGNAL CHECK BY TEST MODE (SIGNAL CHECK) HINT: The "SPORT" indicator (absorber control indicator light) comes on for 1 second when inputting each diagnostic signal. Keep the absorber control switch in the "NORM" position. Keep the vehicle stationary on a level surface for 1 second or more (Acceleration sensor check). Turn the absorber control switch from the "NORM" to "SPORT" position and return it to the "NORM" position. (An absorber control switch signal will be input.) INPUT SIGNAL TABLE Test Mode DTC Test Signal C1787 Absorber control switch operation (When the mode change signal is input.) C1791 Right front acceleration sensor signal (When the vehicle is stopped on a level road for 1 second or more.) C1792 Left front acceleration sensor signal (When the vehicle is stopped on a level road for 1 second or more.) C1793 Rear acceleration sensor signal (When the vehicle is stopped on a level road for 1 second or more.)
4. READ DTC Read the DTC(s) by following the tester screen. HINT: See the list of Test Mode DTCs.
5. RESULT RESULT Result Operation Test Mode DTC is output Repair the output DTC and enter the Test Mode (SIGNAL CHECK) again Test Mode DTC is not output Test Mode (SIGNAL CHECK) is complete
6. END OF SENSOR CHECK Clear the DTCs. Refer to «DTC CHECK / CLEAR»(ref-386964-S15748959292011022400000) . Check that absorber control indicator light blinks (Test Mode). Turn the power switch OFF and Techstream switch off.
7. TEST MODE DTC (DTC OF SIGNAL CHECK) DTC No. Detection Item Trouble Area See C1787 EMS Switch Circuit (Test Mode DTC) Absorber control switch Absorber control switch circuit Absorber control ECU Refer to «DTC C1787: EMS Switch Circuit (Test Mode DTC)»(ref-386965-S41106735082011022400000) C1791 Front Acceleration Sensor RH (Test Mode DTC) Absorber control ECU (Houses right front acceleration sensor) Refer to «DTC C1715: Front Acceleration Sensor RH; DTC C1716: Front Acceleration Sensor LH; DTC C1717: Rear Acceleration Sensor; DTC C1791: Front Acceleration Sensor RH (Test Mode DTC); DTC C1792: Front Acceleration Sensor LH (Test Mode DTC); DTC C1793: Rear Acceleration Sensor (Test Mode DTC)»(ref-386965-S32760982402011022400000) C1792 Front Acceleration Sensor LH (Test Mode DTC) Left front acceleration sensor Left front acceleration sensor circuit Absorber control ECU Refer to «DTC C1715: Front Acceleration Sensor RH; DTC C1716: Front Acceleration Sensor LH; DTC C1717: Rear Acceleration Sensor; DTC C1791: Front Acceleration Sensor RH (Test Mode DTC); DTC C1792: Front Acceleration Sensor LH (Test Mode DTC); DTC C1793: Rear Acceleration Sensor (Test Mode DTC)»(ref-386965-S32760982402011022400000) C1793 Rear Acceleration Sensor (Test Mode DTC) Rear acceleration sensor Rear acceleration sensor circuit Absorber control ECU Refer to «DTC C1715: Front Acceleration Sensor RH; DTC C1716: Front Acceleration Sensor LH; DTC C1717: Rear Acceleration Sensor; DTC C1791: Front Acceleration Sensor RH (Test Mode DTC); DTC C1792: Front Acceleration Sensor LH (Test Mode DTC); DTC C1793: Rear Acceleration Sensor (Test Mode DTC)»(ref-386965-S32760982402011022400000) HINT: The codes in this table are output only in the test mode (SIGNAL CHECK).

PROBLEM SYMPTOMS TABLE

1. Use the table below to help determine the cause of the problem symptom. 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 fuse before inspecting the circuits shown in the chart below.
3. If any malfunction still exists even after checking and confirming that all the circuits are normal, replace the absorber control ECU.

ADAPTIVE VARIABLE SUSPENSION SYSTEM

Scheme 6

Scheme 7

1. CHECK ABSORBER CONTROL ECU Measure the voltage and resistance of the connectors. CONNECTOR U2: Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition RAR+ (2) - Body ground W - Body ground Rear right actuator output Power switch OFF 12.0 to 12.8 ohms RAR- (3) - Body ground V - Body ground Rear right actuator output Power switch OFF 12.0 to 12.8 ohms RBR+ (4) - Body ground GR - Body ground Rear right actuator output Power switch OFF 12.0 to 12.8 ohms RBR- (5) - Body ground Y - Body ground Rear right actuator output Power switch OFF 12.0 to 12.8 ohms RAL+ (6) - Body ground B - Body ground Rear left actuator output Power switch OFF 12.0 to 12.8 ohms RAL- (7) - Body ground G - Body ground Rear left actuator output Power switch OFF 12.0 to 12.8 ohms RBL+ (8) - Body ground R - Body ground Rear left actuator output Power switch OFF 12.0 to 12.8 ohms RBL- (9) - Body ground W - Body ground Rear left actuator output Power switch OFF 12.0 to 12.8 ohms SGL3 (11) - Body ground LG - Body ground Front acceleration sensor ground Power switch OFF Below 1 ohms SGR3 (12) - Body ground BR - Body ground Rear acceleration sensor ground Power switch OFF Below 1 ohms SBR3 (15) - SGR3 (12) P - BR Rear acceleration sensor power supply Power switch ON (IG) 4.75 to 5.25 V SBL3 (16) - SGL3 (11) O - LG Front acceleration sensor power supply Power switch ON (IG) 4.75 to 5.25 V SGRR (27) - SGR3 (12) SB - BR Front acceleration sensor signal Power switch ON (IG), vehicle stationary condition Approx. 2.25 V SGFL (29) - SGL3 (11) L - LG Rear acceleration sensor signal Power switch ON (IG), vehicle stationary condition Approx. 2.25 V CONNECTOR A37: Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition FAR+ (1) - Body ground P-L - Body ground Front right actuator output Power switch OFF 12.0 to 12.8 ohms FAR- (2) - Body ground L-R - Body ground Front right actuator output Power switch OFF 12.0 to 12.8 ohms FBR+ (3) - Body ground B-Y - Body ground Front right actuator output Power switch OFF 12.0 to 12.8 ohms FBR- (4) - Body ground R-L - Body ground Front right actuator output Power switch OFF 12.0 to 12.8 ohms FAL+ (5) - Body ground G-B - Body ground Front left actuator output Power switch OFF 12.0 to 12.8 ohms FBL+ (6) - Body ground G-W - Body ground Front left actuator output Power switch OFF 12.0 to 12.8 ohms FAL- (14) - Body ground G-R - Body ground Front left actuator output Power switch OFF 12.0 to 12.8 ohms FBL- (16) - Body ground G-Y - Body ground Front left actuator output Power switch OFF 12.0 to 12.8 ohms CONNECTOR K72: Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition B (1) - GND (4) B - W-B Power supply Power switch ON (IG) 10 to 14 V GND (4) - Body ground W-B - Body ground Absorber control ECU ground Power switch OFF Below 1 ohms CANH (7) - CANL (8) W - B CAN communication system Power switch OFF 54 to 69 ohms SW1 (9) - Body ground V - Body ground Absorber control switch input Power switch ON (IG), absorber control switch ON 10 to 14 V SW1 (9) - Body ground V - Body ground Absorber control switch input Power switch ON (IG), absorber control switch OFF 0 to 1.5 V SIL (13) - Body ground SB - Body ground Diagnostic communication terminal Power switch ON (IG), connect Techstream to the DLC3 Pulse generation ( (Scheme 7)waveform 1) Using an oscilloscope, check the waveform 1. WAVEFORM 1 (REFERENCE) Item Contents Terminal SIL (K72-13) - Body ground Tool setting 5 V / DIV., 1 msec. / DIV. Vehicle condition Communicating using Techstream

Scheme 8

1. DIAGNOSIS SYSTEM Inspect the battery voltage. Battery voltage 11 to 14 V If the voltage is below 11 V, recharge or replace the battery before proceeding. Check DLC3. The absorber control ECU uses the CAN system and ISO 15765-4 for communication. The terminal arrangement of the DCL3 complies with SAE J1962 and matches the ISO 15765-4 format. Verify the conditions listed in the table below: Symbols (Terminal No.) Terminal Description Condition Specified Condition CG (4) - Body ground Chassis ground Always Below 1 ohms SG (5) - Body ground Signal ground Always Below 1 ohms SIL (7) - SG (5) Bus "+" line During transmission Pulse generation BAT (16) - Body ground Battery positive Always 10 to 14 V CANH (6) - CANL (14) CAN bus line Power switch OFF* 54 to 69 ohms CANH (6) - BAT (16) HIGH-level CAN bus line Power switch OFF* 6 kohms or higher CANH (6) - CG (4) HIGH-level CAN bus line Power switch OFF* 200 ohms or higher CANL (14) - BAT (16) LOW-level CAN bus line Power switch OFF* 6 kohms or higher CANL (14) - CG (4) LOW-level CAN bus line Power switch OFF* 200 ohms or higher NOTE: *: Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the power switch, any other switches or the doors. If the result is not as specified, the DLC3 may have a malfunction. Repair or replace the harness and connector. HINT: Connect the cable of Techstream to the DLC3, turn the power switch ON (IG) and attempt to use the tester. If the display indicates that a communication error has occurred, there is a problem either with the vehicle or with the tester. If communication is normal when the tester is connected to another vehicle, inspect the DLC3 of the original vehicle. If communication is still not possible when the tester is connected to another vehicle, the problem may be in the tester itself. Consult the Service Department listed in the tester's instruction manual. DTCs (Normal mode) DTCs are memorized in the absorber control ECU and read by using Techstream. Refer to «DTC CHECK / CLEAR»(ref-386964-S15748959292011022400000) . Test Mode (SIGNAL CHECK) By switching from normal mode into Test Mode, you can inspect the absorber control switch and each acceleration sensor. Refer to «TEST MODE PROCEDURE»(ref-386964-S34760142652011022400000) . Check the absorber control indicator light. Turn the power switch ON (IG). Check that the absorber control indicator light comes on for 2 seconds. If the indicator light check result is not normal, proceed to troubleshooting for the absorber control indicator light circuit below. Trouble area See procedure Absorber control indicator light (Remains on) Refer to «Absorber Control Indicator Light Remains ON»(ref-386965-S41770903562011022400000) Absorber control indicator light (Does not come on) Refer to «Absorber Control Indicator Light does not Come ON»(ref-386965-S04291518712011022400000)

DTC CHECK / CLEAR

1. DTC CHECK/CLEAR DTC check Connect Techstream to the DLC3. Turn the power switch ON (IG). Read the DTCs following the prompts on the tester screen. DTC clear Connect Techstream to the DLC3. Turn the power switch ON (IG). Operate Techstream to clear the DTC. HINT: Refer to the Techstream operator's manual for further details. Turn the power switch OFF and Techstream switch off.
2. END OF DTC CHECK/CLEAR Turn the power switch ON (IG). Check that the absorber control indicator goes off within approximately 2 seconds.

DATA LIST / ACTIVE TEST

1. READ DATA LIST HINT: According to the DATA LIST displayed on Techstream, the value and status of the switch, sensor, actuator, etc. can be obtained without part removal. Reading the DATA LIST as the first step in troubleshooting is one way to save time. Connect Techstream to the DLC3. Turn the power switch ON (IG) and press Techstream main switch ON. From the display on the tester, read the "DATA LIST". ABSORBER CONTROL ECU Tester Display Measurement Item/Range Normal Condition Diagnostic Note Vehicle Speed Vehicle speed reading/ min.: 0 km/h (0 mph), max.: 255 km/h (158 mph) Actual vehicle speed Speed indicated on speedometer IG Power Source Voltage ECU power supply voltage/ min.: 0 V, max.: 25.5 V Actual ECU power supply voltage: 10 to 14 V - Steering Angle Steering angle sensor reading/min.: -73725.75°, max.: 73728° Actual steering angle Left turn: Reading increases Right turn: Reading decreases Zero point is set when battery is connected Engine Speed Cam position sensor reading/ min.: 0 rpm, max.: 25,500 rpm Actual engine speed Speed indicated on the combination meter Stop Light Switch Stop light switch/ ON or OFF ON: Brake pedal depressed OFF: Brake pedal released - Damping Force Switch 1 Damping force switch 1/ ON or OFF The same as absorber control switch position Operate the absorber control switch TS Terminal TS terminal/ ON or OFF ON: During test mode OFF: Normal mode - TC Terminal TC terminal/ ON or OFF ON: DTC recorded OFF: No DTC recorded - G (Up & Down) Sensor FR G (up & down) FR sensor reading/ min.: -1045267.3 mm/s 2 , max.: 1045299.2 mm/s 2 -8,820 mm/s 2 to 980 mm/s 2 at still condition Reading changes when vehicle (FR) is bounced G (Up & Down) Sensor FL G (up & down) FL sensor reading/ min.: -1045267.3 mm/s 2 , max.: 1045299.2 mm/s 2 -8,820 mm/s 2 to 980 mm/s 2 at still condition Reading changes when vehicle (FL) is bounced G (Up & Down) Sensor Rear G (up & down) rear sensor reading/ min.: -1045267.3 mm/s 2 , max.: 1045299.2 mm/s 2 -8,820 mm/s 2 to 980 mm/s 2 at still condition Reading changes when vehicle (rear) is bounced Damper Step FR Damper step FR/ min.: 0 step, max.: 255 step Min.: 1 step, max.: 17 step - Damper Step FL Damper step FL/ min.: 0 step, max.: 255 step Min.: 1 step, max.: 17 step - Damper Step RR Damper step RR/ min.: 0 step, max.: 255 step Min.: 1 step, max.: 17 step - Damper Step RL Damper step RL/ min.: 0 step, max.: 255 step Min.: 1 step, max.: 17 step - Wheel Speed FR Front right wheel speed reading/ min.: 0 km/h (0 mph), max.: 255 km/h (158 mph) Actual vehicle speed Speed indicated on speedometer Max Damper Step FR Max. damper step FR/ min.: 0 step, max.: 255 step 17 step at still condition - Max Damper Step FL Max. damper step FL/ min.: 0 step, max.: 255 step 17 step at still condition - Max Damper Step RR Max. damper step RR/ min.: 0 step, max.: 255 step 17 step at still condition - Max Damper Step RL Max. damper step RL/ min.: 0 step, max.: 255 step 17 step at still condition - Number of Trouble Code Number of DTC recorded/ min.: 0, max.: 255 - Number of detected DTCs
2. PERFORM ACTIVE TEST HINT: Performing the ACTIVE TEST using Techstream allows the relay, actuator, etc. to operate without parts removal. Performing the ACTIVE TEST as the first step of troubleshooting is one way to save time. It is possible to display the DATA LIST during the ACTIVE TEST. Connect Techstream to the DLC3. Turn the power switch ON (IG) and press Techstream main switch ON. According to the display on the tester, perform the "ACTIVE TEST". ABSORBER CONTROL ECU Tester Display Test Part Control Range Damper Step FR Damper step front right wheel 1 step to 17 steps (Damper step changes) Damper Step FL Damper step front left wheel 1 step to 17 steps (Damper step changes) Damper Step RR Damper step rear right wheel 1 step to 17 steps (Damper step changes) Damper Step RL Damper step rear left wheel 1 step to 17 steps (Damper step changes)

DIAGNOSTIC TROUBLE CODE CHART

HINT

1. If a trouble code is displayed during the DTC check, inspect the trouble areas listed for that code. For details of the code, refer to the "See" below.
2. Inspect the fuse and relay before investigating the trouble areas shown in the table below.

ADAPTIVE VARIABLE SUSPENSION SYSTEM