Adaptive Variable Suspension System (Diagnostics - Introduction): Other Lexus IS III

PRECAUTION [04/2013 - ]

1. PRECAUTION FOR DISCONNECTING CABLE FROM NEGATIVE BATTERY TERMINAL NOTE: When disconnecting the cable from the negative (-) battery terminal, initialize the following systems after the cable is reconnected. System Name See Procedure Variable Gear Ratio Steering System Refer to «INITIALIZATION [04/2013 - ]»(ref-665529-S01115916402014102400000) Air Conditioning System
2. ADAPTIVE VARIABLE SUSPENSION SYSTEM PRECAUTION NOTE: Performing work after replacing the absorber control ECU with a normally functioning one from another vehicle may result in DTCs being stored, or have a negative effect on other systems. When replacing the absorber control ECU, be sure to install a new one. After replacing the absorber control ECU, enter test mode to make sure that all the test mode DTCs can be cleared and to perform registration of vehicle identification information. Refer to «TEST MODE PROCEDURE [04/2013 - ]»(ref-665561-S11652874452014102400000)

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CAUTION / NOTICE / HINT

HINT

Use these procedures to troubleshoot the adaptive variable suspension system.

*: Use the Techstream.

PROCEDURE

1. VEHICLE BROUGHT TO WORKSHOP Result Proceed to NEXT Result: 1 NEXT See step 2
2. PROBLEM SYMPTOM CONFIRMATION 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. Result Proceed to NEXT Result: 1 NEXT See step 4
4. CHECK ECUS CONNECTED TO CAN BUS* Check the ECUs connected to the CAN bus. Refer to «DIAGNOSIS SYSTEM [04/2013 - ]»(ref-665810-S14264089842014102400000) Result Result Proceed to No malfunction appears A Malfunction appears 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 FOR DTC (ADAPTIVE VARIABLE SUSPENSION SYSTEM)* Check for DTCs. Refer to «DTC CHECK/CLEAR [04/2013 - ]»(ref-665561-S05008553892014102400000) Chassis > Air suspension > Trouble Codes Result Result Proceed to DTCs are not output A DTCs are output B Result: 3 B GO TO DIAGNOSTIC TROUBLE CODE TABLE. Refer to «DIAGNOSTIC TROUBLE CODE TABLE [04/2013 - ]»(ref-665561-S29414338802014102400000) Result: 1 A See step 6
6. PROBLEM SYMPTOMS TABLE Result Result Proceed to Fault is not listed in problem symptoms table A Fault is listed in problem symptoms table B Result: 2 B See step 9 Result: 1 A See step 7
7. OVERALL ANALYSIS AND TROUBLESHOOTING* Data List/Active Test Refer to «DATA LIST/ACTIVE TEST [04/2013 - ]»(ref-665561-S16044233382014102400000) Terminals of ECU Refer to «TERMINALS OF ECU [04/2013 - ]»(ref-665561-S08651064332014102400000) 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. CONFIRMATION TEST Result Proceed to NEXT Result: 1 NEXT END

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1. CHECK ABSORBER CONTROL ACTUATOR OPERATION Using SST, connect terminals 12 (TS) and 4 (CG) of the DLC3. *a Front view of DLC3 SST: 09843-18040 Turn the engine switch on (IG). Check that the "SPORT S+" indicator on the multi-information display is blinking in the Test Mode blinking pattern. *a Blinking Pattern in Test Mode *b 0.125 Seconds HINT: If the "SPORT S+" indicator on the multi-information display does not blink, inspect the "SPORT S+" indicator. Refer to «DIAGNOSIS SYSTEM [04/2013 - ]»(ref-665561-S10490063282014102400000) Check absorber control actuator operation. Starting from the SOFT position, depress the brake pedal. Using the 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. *a Shift Range *b 15° *c 120° *d SOFT *e HARD 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°. 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 C1731, C1732, C1733, C1734: Front Damping Force Control Actuator RH Circuit Malfunction; Front Damping Force Control Actuator LH Circuit Malfunction; Rear Damping Force Control Actuator RH Circuit Malfunction; Rear Damping Force Control Actuator LH Circuit Malfunction [04/2013 - ]»(ref-665818-S42443701162014102400000) Front absorber control actuator installation condition Refer to «INSTALLATION [04/2013 - ]»(ref-665819-S12411594402014102400000) Rear absorber control actuator installation condition Refer to «INSTALLATION [04/2013 - ]»(ref-665819-S12248318482014102400000) Turn the engine switch off. Disconnect SST from terminals 12 (TS) and 4 (CG) of the DLC3. Turn the engine switch on (IG). HINT: If the engine switch remains on (IG) after SST is removed from the DLC3, the vehicle will remain in the previously initialized Test Mode.

FAIL-SAFE TABLE [04/2013 - ]

1. FAIL-SAFE TABLE ADAPTIVE VARIABLE SUSPENSION SYSTEM DTC Chart Malfunction Item Fail-safe Operation Fail-safe Deactivation Conditions C1715 C1716 C1717 Acceleration sensor circuit Damping force control is performed with the lower step limit of the front and rear absorber control actuators set to 9th. Returns to normal condition. C1731 C1732 C1733 C1734 Absorber control actuator circuit Interrupts damping force control after moving to the 9th step (except when the actuator is malfunctioning). Returns to normal condition. C1781 Absorber control ECU Interrupts damping force control after moving to the 9th step. Returns to normal condition. C1782 Power source voltage Interrupts damping force control. Returns to normal condition. C1783 Vehicle speed sensor circuit When there is a problem with the front right wheel speed sensor, control is interrupted after moving to the 9th step. When there is a problem with the speed sensor of a wheel other than the front right wheel, control is continued. Returns to normal condition. C1784 Steering sensor Roll posture control is interrupted. Returns to normal condition. C1785* Front steering control ECU Roll posture control is interrupted. Returns to normal condition. C1787 Yaw rate sensor Roll posture control is interrupted. Returns to normal condition. C1789 Vehicle identification malfunction Interrupts damping force control after moving to the 9th step. Returns to normal condition. U0100 U0101 CAN communication system Continues damping force control. Returns to normal condition. U0122 CAN communication system Interrupts damping force control after moving to the 9th step. Returns to normal condition. U0124 U0126 U0130* CAN communication system Roll posture control is interrupted. Returns to normal condition. () *: w/ VGRS system