AIR SUSPENSION SYSTEM, Diagnostic DTC:C1791/91

DTC Code DTC Name
C1791/91 Adaptive Variable Suspension (AVS) Switch Circuit (Test Mode DTC)

DESCRIPTION

The absorber control switch is used to select the damping force mode of the shock absorber.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Warning Indicate

C1791/91

Adaptive Variable Suspension (AVS) Switch Circuit (Test Mode DTC)

The absorber control switch signal does not change.

  • Absorber control switch (combination switch)

  • Harness or connector

  • Suspension control ECU

-
Tip:

This DTC is stored only during test mode.

WIRING DIAGRAM

C224922E04

CAUTION / NOTICE / HINT

Note:

When replacing the suspension control ECU, perform registration (Click here).

PROCEDURE

  1. READ VALUE USING INTELLIGENT TESTER (DAMPING CONTROL SWITCH)

    1. Turn the engine switch off.

    2. Connect the intelligent tester to the DLC3.

    3. Turn the engine switch on (IG).

    4. Turn the intelligent tester on.

    5. Enter the following menus: Chassis / Air suspension / Data List.

      Chassis > Air suspension > Data List

      Tester Display

      Damping Control Switch

      Chassis > Air suspension > Data List

      Tester Display

      Measurement Item

      Range

      Normal Condition

      Diagnostic Note

      Damping Control Switch

      Absorber control switch

      NORMAL, COMFORT or SPORT

      Indicates current absorber control switch position

      -

    6. Check that the value displayed on the intelligent tester changes by operating the absorber control switch between COMF, NORMAL and SPORT.

      OK

      Absorber control switch value changes.

      Result

      Result

      OK

      NG
    OK

    USE SIMULATION METHOD TO CHECK

    Click hereClick hereClick here

    NG

  2. INSPECT ABSORBER CONTROL SWITCH (COMBINATION SWITCH)

    1. Turn the engine switch off.

    2. Remove the combination switch.

      Click here

    3. C220877C01

      *a

      Component without harness connected

      (Absorber Control Switch [Combination Switch])

      Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection

      Switch Condition

      Specified Condition

      9 (E) - 11 (ECU2)

      COMF position

      Below 1 Ω

      Normal position

      10 kΩ or higher

      9 (E) - 1 (ECU1)

      SPORT position

      Below 1 Ω

      Normal position

      10 kΩ or higher

      Result

      Result

      OK

      NG
    NG

    REPLACE COMBINATION SWITCH ASSEMBLY

    Click here

    OK

  3. CHECK HARNESS AND CONNECTOR (ABSORBER CONTROL SWITCH - SUSPENSION CONTROL ECU)

    1. Disconnect the i5 combination switch connector.

    2. Disconnect the A40 suspension control ECU connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      i5-1 (ECU1) - A40-23 (TSW1)

      Always

      Below 1 Ω

      i5-11 (ECU2) - A40-22 (TSW2)

      Always

      Below 1 Ω

      i5-9 (E) - Body ground

      Always

      Below 1 Ω

      i5-1 (ECU1) - Body ground

      Always

      10 kΩ or higher

      i5-11 (ECU2) - Body ground

      Always

      10 kΩ or higher

      Result

      Result

      OK

      NG
    OK

    REPLACE SUSPENSION CONTROL ECU

    Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR