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Adaptive Variable Suspension System (Diagnostic Codes): Other Lexus IS III

Electronic Suspension 2 illustrations ~4586 words

CAUTION / NOTICE / HINT

Note. Before performing troubleshooting, inspect the connectors of related circuits. If DTC C1782 (Power Source Voltage Malfunction) is output at the same time, perform troubleshooting for C1782 first. Refer to DTC C1782: Power Source Voltage Malfunction [04/2013 - ] Before replacing the absorber control ECU, perform all of the following again: 1) symptom simulation. Refer to HOW TO PROCEED WITH TROUBLESHOOTING [04/2013 - ] ; 2) DTC inspection. Refer to DTC CHECK/CLEAR [04/2013 - ] ; and 3) Techstream inspection (ECU Data List or Active Test. Refer to DATA LIST/ACTIVE TEST [04/2013 - ] ). If no malfunctions are found in other areas, replace the absorber control ECU. When the absorber control ECU is replaced, switch to test mode and check that all test mode DTCs are cleared when their respective deletion conditions are met. Refer to TEST MODE PROCEDURE [04/2013 - ]

PROCEDURE

  1. CHECK FOR DTC (CAN COMMUNICATION SYSTEM) Check for DTCs. Refer to «DTC CHECK/CLEAR [04/2013 - ]»(ref-665561-S05008553892014102400000) Chassis > Air suspension > Trouble Codes Result Result Proceed to CAN DTC is not output A CAN DTC is output B Result: 1 A REPLACE ABSORBER CONTROL ECU. Refer to «REMOVAL [04/2013 - ]»(ref-665819-S33981721892014102400000) 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)

Note. Before performing troubleshooting, inspect the connectors of related circuits. If DTC C1782 (Power Source Voltage Malfunction) is output at the same time, perform troubleshooting for C1782 first. Refer to DTC C1782: Power Source Voltage Malfunction [04/2013 - ] Before replacing the absorber control ECU, perform all of the following again: 1) symptom simulation. Refer to HOW TO PROCEED WITH TROUBLESHOOTING [04/2013 - ] ; 2) DTC inspection. Refer to DTC CHECK/CLEAR [04/2013 - ] ; and 3) Techstream inspection (ECU Data List or Active Test. Refer to DATA LIST/ACTIVE TEST [04/2013 - ] ). If no malfunctions are found in other areas, replace the absorber control ECU. When the absorber control ECU is replaced, switch to test mode and check that all test mode DTCs are cleared when their respective deletion conditions are met. Refer to TEST MODE PROCEDURE [04/2013 - ]

Scheme 13

Scheme 13: PROCEDURE
Scheme 13: PROCEDURE

Scheme 14

Scheme 14
Scheme 14
  1. CLEAR DTC Clear the DTCs. Refer to «DTC CHECK/CLEAR [04/2013 - ]»(ref-665561-S05008553892014102400000) Result Proceed to NEXT Result: 1 NEXT See step 2
  2. PERFORM ACTIVE TEST USING TECHSTREAM (DAMPER STEP) 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 / Air suspension / Active Test. Chassis > Air suspension > Active Test Tester Display Measurement Item Control Range Diagnostic Note Damper Step FR Changes damper step (front RH) 1 to 17 step The shock absorber hardens as the damper step increases. Damper Step FL Changes damper step (front LH) 1 to 17 step The shock absorber hardens as the damper step increases. Damper Step RR Changes damper step (rear RH) 1 to 17 step The shock absorber hardens as the damper step increases. Damper Step RL Changes damper step (rear LH) 1 to 17 step The shock absorber hardens as the damper step increases. Chassis > Air suspension > Active Test Tester Display Damper Step FR Chassis > Air suspension > Active Test Tester Display Damper Step FL Chassis > Air suspension > Active Test Tester Display Damper Step RR Chassis > Air suspension > Active Test Tester Display Damper Step RL Check if the absorber control actuator operates to harden the suspension with the Techstream. OK The absorber control actuator operates. Result Proceed to OK NG Result: 2 NG See step 4 Result: 1 OK See step 3
  3. RECONFIRM DTC Check that the same DTC is output. Refer to «DTC CHECK/CLEAR [04/2013 - ]»(ref-665561-S05008553892014102400000) Chassis > Air suspension > Trouble Codes Result Result Proceed to DTC is output A DTC is not output B Result: 2 B USE SIMULATION METHOD TO CHECK. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING [04/2013 - ]»(ref-665529-S21853141262014102400000) Result: 1 A See step 4
  4. INSPECT ABSORBER CONTROL ACTUATOR OF WHEEL TO BE INSPECTED Turn the engine switch off. Remove the absorber control actuator for the front side. Refer to «REMOVAL [04/2013 - ]»(ref-665819-S37706045262014102400000) or rear side. Refer to «REMOVAL [04/2013 - ]»(ref-665819-S27204103912014102400000) . Inspect the absorber control actuator for the front side. Refer to «INSPECTION [04/2013 - ]»(ref-665819-S16855373672014102400000) or rear side. Refer to «INSPECTION [04/2013 - ]»(ref-665819-S37302874702014102400000) . Result Result Proceed to OK A Front absorber control actuator RH malfunction B Front absorber control actuator LH malfunction C Rear absorber control actuator RH malfunction D Rear absorber control actuator LH malfunction E Result: 2 B REPLACE FRONT ABSORBER CONTROL ACTUATOR RH. Refer to «REMOVAL [04/2013 - ]»(ref-665819-S37706045262014102400000) Result: 3 C REPLACE FRONT ABSORBER CONTROL ACTUATOR LH. Refer to «REMOVAL [04/2013 - ]»(ref-665819-S37706045262014102400000) Result: 4 D REPLACE REAR ABSORBER CONTROL ACTUATOR RH. Refer to «REMOVAL [04/2013 - ]»(ref-665819-S27204103912014102400000) Result: 5 E REPLACE REAR ABSORBER CONTROL ACTUATOR LH. Refer to «REMOVAL [04/2013 - ]»(ref-665819-S27204103912014102400000) Result: 1 A See step 5
  5. CHECK HARNESS AND CONNECTOR (ABSORBER CONTROL ACTUATOR - ABSORBER CONTROL ECU) Check the front absorber control actuator harness and connector. *A for Front RH *B for Front LH *a Front view of wire harness connector (to Absorber Control ECU) Connect the A6 and/or A38 front absorber control actuator connector. Disconnect the A64 absorber control ECU connector. Measure the resistance according to the value(s) in the table below. Standard Resistance FOR FRONT RH (FOR DTC C1731) Tester Connection Condition Specified Condition A64-1 (FBR+) - Body ground Always 12.0 to 12.8 ohms A64-2 (FBR-) - Body ground Always 12.0 to 12.8 ohms A64-7 (FAR+) - Body ground Always 12.0 to 12.8 ohms A64-8 (FAR-) - Body ground Always 12.0 to 12.8 ohms FOR FRONT LH (FOR DTC C1732) Tester Connection Condition Specified Condition A64-3 (FAL+) - Body ground Always 12.0 to 12.8 ohms A64-5 (FAL-) - Body ground Always 12.0 to 12.8 ohms A64-6 (FBL+) - Body ground Always 12.0 to 12.8 ohms A64-4 (FBL-) - Body ground Always 12.0 to 12.8 ohms Check the rear absorber control actuator harness and connector. *A for Rear RH *B for Rear LH *a Front view of wire harness connector (to Absorber Control ECU) Connect the P17 and/or Q26 rear absorber control actuator connector. Disconnect the P16 absorber control ECU connector. Measure the resistance according to the value(s) in the table below. Standard Resistance FOR REAR RH (FOR DTC C1733) Tester Connection Condition Specified Condition P16-1 (RAR+) - Body ground Always 12.0 to 12.8 ohms P16-2 (RAR-) - Body ground Always 12.0 to 12.8 ohms P16-3 (RBR+) - Body ground Always 12.0 to 12.8 ohms P16-4 (RBR-) - Body ground Always 12.0 to 12.8 ohms FOR REAR LH (FOR DTC C1734) Tester Connection Condition Specified Condition P16-5 (RAL+) - Body ground Always 12.0 to 12.8 ohms P16-6 (RAL-) - Body ground Always 12.0 to 12.8 ohms P16-7 (RBL+) - Body ground Always 12.0 to 12.8 ohms P16-8 (RBL-) - Body ground Always 12.0 to 12.8 ohms Result Proceed to OK NG Result: 1 OK REPLACE ABSORBER CONTROL ECU. Refer to «REMOVAL [04/2013 - ]»(ref-665819-S33981721892014102400000) Result: 2 NG REPAIR OR REPLACE HARNESS OR CONNECTOR

Note. Before performing troubleshooting, inspect the connectors of related circuits. If DTC C1782 (Power Source Voltage Malfunction) is output at the same time, perform troubleshooting for C1782 first. Refer to DTC C1782: Power Source Voltage Malfunction [04/2013 - ] Before replacing the absorber control ECU, perform all of the following again: 1) symptom simulation. Refer to HOW TO PROCEED WITH TROUBLESHOOTING [04/2013 - ] ; 2) DTC inspection. Refer to DTC CHECK/CLEAR [04/2013 - ] ; and 3) Techstream inspection (ECU Data List or Active Test. Refer to DATA LIST/ACTIVE TEST [04/2013 - ] ). If no malfunctions are found in other areas, replace the absorber control ECU. When the absorber control ECU is replaced, switch to test mode and check that all test mode DTCs are cleared when their respective deletion conditions are met. Refer to TEST MODE PROCEDURE [04/2013 - ]

  1. READ VALUE USING TECHSTREAM ((UP & DOWN) G SENSOR) 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 / Air suspension / Data List. Chassis > Air suspension > Data List Tester Display Measurement Item Range Normal Condition Diagnostic Note (Up & Down) G Sensor FR Front acceleration sensor RH (up and down) Min.: -1045.29 m/s 2 Max.: 1045.26 m/s 2 -0.98 to 0.98 m/s 2 when stationary The value changes when the vehicle (front RH) is bounced. (Up & Down) G Sensor FL Front acceleration sensor LH (up and down) Min.: -1045.29 m/s 2 Max.: 1045.26 m/s 2 -0.98 to 0.98 m/s 2 when stationary The value changes when the vehicle (front LH) is bounced. (Up & Down) G Sensor Rear Rear acceleration sensor (up and down) Min.: -1045.29 m/s 2 Max.: 1045.26 m/s 2 -0.98 to 0.98 m/s 2 when stationary The value changes when the vehicle (rear) is bounced. Chassis > Air suspension > Data List Tester Display (Up & Down) G Sensor FR (Up & Down) G Sensor FL (Up & Down) G Sensor Rear OK Acceleration value changes. Result Result Proceed to OK A NG (front RH) B NG (front LH or rear) C Result: 2 B REPLACE ABSORBER CONTROL ECU. Refer to «REMOVAL [04/2013 - ]»(ref-665819-S33981721892014102400000) Result: 3 C See step 3 Result: 1 A See step 2
  2. RECONFIRM DTC Clear the DTCs. Refer to «DTC CHECK/CLEAR [04/2013 - ]»(ref-665561-S05008553892014102400000) Chassis > Air suspension > Clear DTCs Turn the engine switch off. Check for DTCs. Refer to «DTC CHECK/CLEAR [04/2013 - ]»(ref-665561-S05008553892014102400000) Chassis > Air suspension > Trouble Codes Result Result Proceed to DTC is output (front LH or rear) A DTC is output (front RH) B DTC is not output C Result: 2 B REPLACE ABSORBER CONTROL ECU. Refer to «REMOVAL [04/2013 - ]»(ref-665819-S33981721892014102400000) Result: 3 C USE SIMULATION METHOD TO CHECK. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING [04/2013 - ]»(ref-665529-S21853141262014102400000) Result: 1 A See step 3
  3. INSPECT ACCELERATION SENSOR (FRONT LH OR REAR) Turn the engine switch off. Remove the front acceleration sensor LH. Refer to «REMOVAL [04/2013 - ]»(ref-665819-S22322789822014102400000) or rear acceleration sensor. Refer to «REMOVAL [04/2013 - ]»(ref-665819-S41057885172014102400000) . NOTE: Do not drop the acceleration sensor. If it is dropped, replace it with a new one. Inspect the front acceleration sensor LH. Refer to «INSPECTION [04/2013 - ]»(ref-665819-S42094980902014102400000) or rear acceleration sensor. Refer to «INSPECTION [04/2013 - ]»(ref-665819-S04493596872014102400000) . Result Result Proceed to OK A Front acceleration sensor LH malfunction B Rear acceleration sensor malfunction C Result: 2 B REPLACE FRONT ACCELERATION SENSOR LH. Refer to «REMOVAL [04/2013 - ]»(ref-665819-S22322789822014102400000) Result: 3 C REPLACE REAR ACCELERATION SENSOR. Refer to «REMOVAL [04/2013 - ]»(ref-665819-S41057885172014102400000) Result: 1 A See step 4
  4. CHECK HARNESS AND CONNECTOR (ACCELERATION SENSOR - ABSORBER CONTROL ECU) Check the front acceleration sensor LH harness and connector (when DTC C1716 or C1797 is output). Disconnect the A64 absorber control ECU connector. Disconnect the A32 front acceleration sensor LH connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition A32-1 (SGFL) - A64-18 (SGS1) Always Below 1 ohms A32-2 (SGG) - A64-10 (SGG1) Always Below 1 ohms A32-3 (SGB) - A64-9 (SGB1) Always Below 1 ohms A32-1 (SGFL) or A64-18 (SGS1) - Body ground Always 10 kohms or higher A32-2 (SGG) or A64-10 (SGG1) - Body ground Always 10 kohms or higher A32-3 (SGB) or A64-9 (SGB1) - Body ground Always 10 kohms or higher Check the rear acceleration sensor harness and connector (when DTC C1717 or C1798 is output). Disconnect the K39 absorber control ECU connector. Disconnect the P18 rear acceleration sensor connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition P18-1 (SGRR) - K39-26 (SGS2) Always Below 1 ohms P18-2 (SGND) - K39-16 (SGG2) Always Below 1 ohms P18-3 (SGV) - K39-17 (SGB2) Always Below 1 ohms P18-1 (SGRR) or K39-26 (SGS2) - Body ground Always 10 kohms or higher P18-2 (SGND) or K39-16 (SGG2) - Body ground Always 10 kohms or higher P18-3 (SGV) or K39-17 (SGB2) - Body ground Always 10 kohms or higher Result Proceed to OK NG Result: 1 OK REPLACE ABSORBER CONTROL ECU. Refer to «REMOVAL [04/2013 - ]»(ref-665819-S33981721892014102400000) Result: 2 NG REPAIR OR REPLACE HARNESS OR CONNECTOR

Note. Before performing troubleshooting, inspect the connectors of related circuits. Before replacing the absorber control ECU, perform all of the following again: 1) symptom simulation. Refer to HOW TO PROCEED WITH TROUBLESHOOTING [04/2013 - ] ; 2) DTC inspection. Refer to DTC CHECK/CLEAR [04/2013 - ] ; and 3) Techstream inspection (ECU Data List or Active Test. Refer to DATA LIST/ACTIVE TEST [04/2013 - ] ). If no malfunctions are found in other areas, replace the absorber control ECU. When the absorber control ECU is replaced, switch to test mode and check that all test mode DTCs are cleared when their respective deletion conditions are met. Refer to TEST MODE PROCEDURE [04/2013 - ] Inspect the fuses for circuits related to this system before performing the following inspection procedure.

  1. READ VALUE USING TECHSTREAM (IG POWER SOURCE VOLTAGE) 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 / Air suspension / Data List. Chassis > Air suspension > Data List Tester Display Measurement Item Range Normal Condition Diagnostic Note IG Power Source Voltage ECU power supply voltage Min.: 0.0 V Max.: 25.5 V 11 to 14 V (Actual ECU power supply voltage): Engine switch on (IG) - Chassis > Air suspension > Data List Tester Display IG Power Source Voltage OK The normal condition value is displayed on the Techstream. Result Proceed to OK NG Result: 2 NG See step 3 Result: 1 OK See step 2
  2. CHECK FOR DTC Clear the DTCs. Refer to «DTC CHECK/CLEAR [04/2013 - ]»(ref-665561-S05008553892014102400000) Chassis > Air suspension > Clear DTCs Turn the engine switch off. Check for DTCs. Refer to «DTC CHECK/CLEAR [04/2013 - ]»(ref-665561-S05008553892014102400000) Chassis > Air suspension > Trouble Codes Result Result Proceed to DTC is not output A DTC is output B Result: 1 A USE SIMULATION METHOD TO CHECK. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING [04/2013 - ]»(ref-665529-S21853141262014102400000) Result: 2 B REPLACE ABSORBER CONTROL ECU. Refer to «REMOVAL [04/2013 - ]»(ref-665819-S33981721892014102400000)
  3. INSPECT BATTERY Check the battery voltage. Standard Voltage 11 to 14 V Result Proceed to OK NG Result: 2 NG CHECK OR REPLACE CHARGING SYSTEM OR BATTERY. Refer to «ON-VEHICLE INSPECTION [04/2013 - ]»(ref-665710-S19859479582014102400000) Result: 1 OK See step 4
  4. CHECK TERMINAL VOLTAGE (B) Disconnect the K39 absorber control ECU connector. Measure the voltage according to the value(s) in the table below. *a Front view of wire harness connector (to Absorber Control ECU) Standard Voltage Tester Connection Condition Specified Condition K39-3 (B) - Body ground Engine switch on (IG) 11 to 14 V Result Proceed to OK NG Result: 2 NG REPAIR OR REPLACE HARNESS OR CONNECTOR Result: 1 OK See step 5
  5. CHECK HARNESS AND CONNECTOR (GND TERMINAL) Disconnect the K39 absorber control ECU connector. Measure the resistance according to the value(s) in the table below. *a Front view of wire harness connector (to Absorber Control ECU) Standard Resistance Tester Connection Condition Specified Condition K39-5 (GND) - Body ground Always Below 1 ohms Result Proceed to OK NG Result: 1 OK REPLACE ABSORBER CONTROL ECU. Refer to «REMOVAL [04/2013 - ]»(ref-665819-S33981721892014102400000) Result: 2 NG REPAIR OR REPLACE HARNESS OR CONNECTOR

Note. Before performing troubleshooting, inspect the connectors of related circuits. If DTC C1782 (Power Source Voltage Malfunction) is output at the same time, perform troubleshooting for C1782 first. Refer to DTC C1783: Speed Signal Communication Error [04/2013 - ] Before replacing the absorber control ECU, perform all of the following again: 1) symptom simulation. Refer to HOW TO PROCEED WITH TROUBLESHOOTING [04/2013 - ] ; 2) DTC inspection. Refer to DTC CHECK/CLEAR [04/2013 - ] ; and 3) Techstream inspection (ECU Data List or Active Test. Refer to DATA LIST/ACTIVE TEST [04/2013 - ] ). If no malfunctions are found in other areas, replace the absorber control ECU. When the absorber control ECU is replaced, switch to test mode and check that all test mode DTCs are cleared when their respective deletion conditions are met. Refer to TEST MODE PROCEDURE [04/2013 - ]

  1. CHECK FOR DTC (CAN COMMUNICATION SYSTEM) Check for DTCs. Refer to «DTC CHECK/CLEAR [04/2013 - ]»(ref-665561-S05008553892014102400000) Chassis > Air suspension > Trouble Codes Result Result Proceed to CAN DTC is not output A CAN DTC is 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 2
  2. CHECK FOR DTC (VEHICLE STABILITY CONTROL SYSTEM) Check if DTC C1783 and a vehicle stability control system speed sensor malfunction DTC are output. Refer to «DTC CHECK/CLEAR [04/2013 - ]»(ref-665532-S37150082782014102400000) Chassis > ABS/VSC/TRAC > Trouble Codes Result Result Proceed to DTC is not output A DTC is output B Result: 1 A REPLACE ABSORBER CONTROL ECU. Refer to «REMOVAL [04/2013 - ]»(ref-665819-S33981721892014102400000) Result: 2 B GO TO VEHICLE STABILITY CONTROL SYSTEM (DIAGNOSTIC TROUBLE CODE TABLE). Refer to «DIAGNOSTIC TROUBLE CODE TABLE [04/2013 - ]»(ref-665532-S42482876212014102400000)

Note. When replacing the steering sensor, confirm that the replacement part is of the correct specification. Before performing troubleshooting, inspect the connectors of related circuits. If DTC C1782 (Power Source Voltage Malfunction) is output at the same time, perform troubleshooting for C1782 first. Refer to DTC C1782: Power Source Voltage Malfunction [04/2013 - ] Before replacing the absorber control ECU, perform all of the following again: 1) symptom simulation. Refer to HOW TO PROCEED WITH TROUBLESHOOTING [04/2013 - ] ; 2) DTC inspection. Refer to DTC CHECK/CLEAR [04/2013 - ] ; and 3) Techstream inspection (ECU Data List or Active Test. Refer to DATA LIST/ACTIVE TEST [04/2013 - ] ). If no malfunctions are found in other areas, replace the absorber control ECU. When the absorber control ECU is replaced, switch to test mode and check that all test mode DTCs are cleared when their respective deletion conditions are met. Refer to TEST MODE PROCEDURE [04/2013 - ]

  1. CHECK FOR DTC (CAN COMMUNICATION SYSTEM) Check for DTCs. Refer to «DTC CHECK/CLEAR [04/2013 - ]»(ref-665561-S05008553892014102400000) Chassis > Air suspension > Trouble Codes Result Result Proceed to CAN DTC is not output A CAN DTC is 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 2
  2. CHECK FOR DTC (VEHICLE STABILITY CONTROL SYSTEM) Check for steering sensor malfunction DTCs. Refer to «DTC CHECK/CLEAR [04/2013 - ]»(ref-665532-S37150082782014102400000) Chassis > ABS/VSC/TRAC > Trouble Codes Result Result Proceed to DTC is not output A DTC is output B Result: 1 A REPLACE ABSORBER CONTROL ECU. Refer to «REMOVAL [04/2013 - ]»(ref-665819-S33981721892014102400000) Result: 2 B GO TO VEHICLE STABILITY CONTROL SYSTEM (DIAGNOSTIC TROUBLE CODE TABLE). Refer to «DIAGNOSTIC TROUBLE CODE TABLE [04/2013 - ]»(ref-665532-S42482876212014102400000)

Note. Before performing troubleshooting, inspect the connectors of related circuits. If DTC C1782 (Power Source Voltage Malfunction) is output at the same time, perform troubleshooting for C1782 first. Refer to DTC C1782: Power Source Voltage Malfunction [04/2013 - ] Before replacing the absorber control ECU, perform all of the following again: 1) symptom simulation. Refer to HOW TO PROCEED WITH TROUBLESHOOTING [04/2013 - ] ; 2) DTC inspection. Refer to DTC CHECK/CLEAR [04/2013 - ] ; and 3) Techstream inspection (ECU Data List or Active Test. Refer to DATA LIST/ACTIVE TEST [04/2013 - ] ). If no malfunctions are found in other areas, replace the absorber control ECU. When the absorber control ECU is replaced, switch to test mode and check that all test mode DTCs are cleared when their respective deletion conditions are met. Refer to TEST MODE PROCEDURE [04/2013 - ]

  1. CHECK FOR DTC (CAN COMMUNICATION SYSTEM) Check for DTCs. Refer to «DTC CHECK/CLEAR [04/2013 - ]»(ref-665561-S05008553892014102400000) Chassis > Air suspension > Trouble Codes Result Result Proceed to CAN DTC is not output A CAN DTC is 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 2
  2. CHECK FOR DTC (VGRS SYSTEM) Check for VGRS system malfunction DTCs. Refer to «DTC CHECK/CLEAR [04/2013 - ]»(ref-665552-S41604125052014102400000) Chassis > VGRS > Trouble Codes Result Result Proceed to DTC is not output A DTC is output B Result: 1 A USE SIMULATION METHOD TO CHECK. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING [04/2013 - ]»(ref-665529-S21853141262014102400000) Result: 2 B GO TO VGRS SYSTEM (DIAGNOSTIC TROUBLE CODE TABLE). Refer to «DIAGNOSTIC TROUBLE CODE TABLE [04/2013 - ]»(ref-665552-S23158770552014102400000)

Note. Before performing troubleshooting, inspect the connectors of related circuits. If DTC C1782 (Power Source Voltage Malfunction) is output at the same time, perform troubleshooting for C1782 first. Refer to DTC C1782: Power Source Voltage Malfunction [04/2013 - ] Before replacing the absorber control ECU, perform all of the following again: 1) symptom simulation. Refer to HOW TO PROCEED WITH TROUBLESHOOTING [04/2013 - ] ; 2) DTC inspection. Refer to DTC CHECK/CLEAR [04/2013 - ] ; and 3) Techstream inspection (ECU Data List or Active Test. Refer to DATA LIST/ACTIVE TEST [04/2013 - ] ). If no malfunctions are found in other areas, replace the absorber control ECU. When the absorber control ECU is replaced, switch to test mode and check that all test mode DTCs are cleared when their respective deletion conditions are met. Refer to TEST MODE PROCEDURE [04/2013 - ]

  1. CHECK FOR DTC (CAN COMMUNICATION SYSTEM) Check for DTCs. Refer to «DTC CHECK/CLEAR [04/2013 - ]»(ref-665561-S05008553892014102400000) Chassis > Air suspension > Trouble Codes Result Result Proceed to CAN DTC is not output A CAN DTC is 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 2
  2. CHECK FOR DTC (VEHICLE STABILITY CONTROL SYSTEM) Check for yaw rate sensor malfunction DTCs. Refer to «DTC CHECK/CLEAR [04/2013 - ]»(ref-665532-S37150082782014102400000) Chassis > ABS/VSC/TRAC > Trouble Codes Result Result Proceed to DTC is not output A DTC is output B Result: 1 A REPLACE ABSORBER CONTROL ECU. Refer to «REMOVAL [04/2013 - ]»(ref-665819-S33981721892014102400000) Result: 2 B GO TO VEHICLE STABILITY CONTROL SYSTEM (DIAGNOSTIC TROUBLE CODE TABLE). Refer to «DIAGNOSTIC TROUBLE CODE TABLE [04/2013 - ]»(ref-665532-S42482876212014102400000)

Note. Before performing troubleshooting, inspect the connectors of related circuits. If DTC C1781 (Suspension Control ECU Malfunction) is output at the same time, perform troubleshooting for C1781 first. Refer to DTC C1781: Suspension Control ECU Malfunction [04/2013 - ] If DTC C1782 (Power Source Voltage Malfunction) is output at the same time, perform troubleshooting for C1782 first. Refer to DTC C1782: Power Source Voltage Malfunction [04/2013 - ] Before replacing the absorber control ECU, perform all of the following again: 1) symptom simulation. Refer to HOW TO PROCEED WITH TROUBLESHOOTING [04/2013 - ] ; 2) DTC inspection. Refer to DTC CHECK/CLEAR [04/2013 - ] ; and 3) Techstream inspection (ECU Data List or Active Test. Refer to DATA LIST/ACTIVE TEST [04/2013 - ] ). If no malfunctions are found in other areas, replace the absorber control ECU. When the absorber control ECU is replaced, switch to test mode and check that all test mode DTCs are cleared when their respective deletion conditions are met. Refer to TEST MODE PROCEDURE [04/2013 - ]

  1. CHECK FOR DTC (CAN COMMUNICATION SYSTEM) Check for DTCs. Refer to «DTC CHECK/CLEAR [04/2013 - ]»(ref-665561-S05008553892014102400000) Chassis > Air suspension > Trouble Codes Result Result Proceed to CAN DTC is not output A CAN DTC is 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 2
  2. CHECK VEHICLE IDENTIFICATION INFORMATION STATUS Check that vehicle identification information has been stored. Refer to «TEST MODE PROCEDURE [04/2013 - ]»(ref-665561-S11652874452014102400000) Result Result Proceed to Information stored A Information not stored B Result: 2 B PERFORM VEHICLE IDENTIFICATION INFORMATION REGISTRATION. Refer to «TEST MODE PROCEDURE [04/2013 - ]»(ref-665561-S11652874452014102400000) Result: 1 A See step 3
  3. CHECK RELATED PART If the DTC was output as a result of the replacement of a related part, replace the part with one that has a correct part number. Related Part ECM Steering sensor w/ VGRS system: VGRS ECU (Front steering control ECU) NOTE: When removing a related part to check it, be sure to follow the appropriate procedures and precautions. Refer to the following procedures to remove the ECM. Refer to «REMOVAL [04/2013 - ]»(ref-665726-S01579686462014102400000) Refer to the following procedures to remove the steering sensor. Refer to «REMOVAL [04/2013 - ]»(ref-665739-S05619292902014102400000) Refer to the following procedures to remove the VGRS ECU (front steering control ECU). Refer to «REMOVAL [04/2013 - ]»(ref-665820-S08198949432014102400000) HINT: If parts have not been replaced and DTC C1789 is output, there may be an internal malfunction in the absorber control ECU. Therefore, replace the absorber control ECU. Refer to «REMOVAL [04/2013 - ]»(ref-665819-S33981721892014102400000) Result Proceed to NEXT Result: 1 NEXT See step 4
  4. CHECK FOR DTC Clear the DTCs. Refer to «DTC CHECK/CLEAR [04/2013 - ]»(ref-665561-S05008553892014102400000) Chassis > Air suspension > Clear DTCs Turn the engine switch off. Check if DTC C1789 is output. Refer to «DTC CHECK/CLEAR [04/2013 - ]»(ref-665561-S05008553892014102400000) Chassis > Air suspension > Trouble Codes OK DTC C1789 is not output. Result Proceed to OK NG Result: 1 OK END Result: 2 NG REPLACE ABSORBER CONTROL ECU. Refer to «REMOVAL [04/2013 - ]»(ref-665819-S33981721892014102400000)

Note. Before performing troubleshooting, inspect the connectors of related circuits. If DTC C1782 (Power Source Voltage Malfunction) is output at the same time, perform troubleshooting for C1782 first. Refer to DTC C1782: Power Source Voltage Malfunction [04/2013 - ] Before replacing the absorber control ECU, perform all of the following again: 1) symptom simulation. Refer to HOW TO PROCEED WITH TROUBLESHOOTING [04/2013 - ] ; 2) DTC inspection. Refer to DTC CHECK/CLEAR [04/2013 - ] ; and 3) Techstream inspection (ECU Data List or Active Test. Refer to DATA LIST/ACTIVE TEST [04/2013 - ] ). If no malfunctions are found in other areas, replace the absorber control ECU. When the absorber control ECU is replaced, switch to test mode and check that all test mode DTCs are cleared when their respective deletion conditions are met. Refer to TEST MODE PROCEDURE [04/2013 - ]

  1. CHECK FOR DTC Clear the DTCs. Refer to «DTC CHECK/CLEAR [04/2013 - ]»(ref-665561-S05008553892014102400000) Chassis > Air suspension > Clear DTCs Turn the engine switch off. Drive the vehicle at a speed of 30 km/h (19 mph) or more for 10 seconds or more. Check for DTCs. Refer to «DTC CHECK/CLEAR [04/2013 - ]»(ref-665561-S05008553892014102400000) Chassis > Air suspension > Trouble Codes Result Result Proceed to CAN DTC is not output A CAN DTC is output B HINT: If a CAN communication malfunction DTC and a related sensor malfunction DTC are output at the same time, the CAN communication malfunction must be repaired before troubleshooting the sensor malfunction DTC. Result: 1 A USE SIMULATION METHOD TO CHECK. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING [04/2013 - ]»(ref-665529-S21853141262014102400000) 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)

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