Air Suspension System Test Mode Procedure

  1. SIGNAL CHECK (WHEN USING INTELLIGENT TESTER)

  1. SIGNAL CHECK (WHEN USING SST CHECK WIRE)

  1. TEST MODE DTC CHART

Air Suspension System -- Test Mode Procedure



SIGNAL CHECK (WHEN USING INTELLIGENT TESTER)
HINT:
  1. When entering test mode, the suspension control ECU first stores all the test mode DTCs. After completing test mode for each check item, the test mode DTCs that are determined to be normal by the suspension control ECU are cleared. The test mode DTCs for other check items may not be cleared when only a certain signal is inspected.
  2. When the system returns to normal mode, all the test mode DTCs are cleared.

  1. Turn the ignition switch off.

  2. Connect the intelligent tester to the DLC3.

  3. Start the engine.

  4. Turn the intelligent tester on.

  5. Enter the following menus: Chassis / Air suspension / Utility / Signal Check.

  6. Check the display of the multi-information display and confirm that the system is in test mode.

  7. Check each item in the table below by performing the corresponding operation.

    Test Mode (Input Signal Check) Table
    Check Item
    		Operation
    Absorber control switch signal
    		Slowly move absorber control switch from COMF to SPORT and then COMF
    Height control switch signal
    		First press "up" on height control switch and then press "down"
    Height control OFF switch signal
    		Turn height control OFF switch from on to off

  8. Read the test mode DTCs by following the prompts on the intelligent tester screen.

  9. Check the malfunction using the Test Mode DTC Chart below. After completing test mode, disconnect the intelligent tester and turn the ignition switch off.


SIGNAL CHECK (WHEN USING SST CHECK WIRE)
HINT:
  1. When entering test mode, the suspension control ECU first stores all the test mode DTCs. After completing test mode for each check item, the test mode DTCs that are determined to be normal by the suspension control ECU are cleared. The test mode DTCs for other check items may not be cleared when only a certain signal is inspected.
  2. When the system returns to normal mode, all the test mode DTCs are cleared.

  1. Turn the ignition switch off.



    2. Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Suspension Control.Air Suspension System.Air Suspension System Test Mode Procedure

  2. Using SST, connect terminals 12 (TS) and 4 (CG) of the DLC3.

    SST
    09843-18040
    NOTICE:
    Do not connect the incorrect terminals as this will cause damage.
    Text in Illustration
    *a
    		Front view of DLC3

  3. Turn the ignition switch to ON.

  4. Check the display of the multi-information display and confirm that the system is in test mode.



    5. Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Suspension Control.Air Suspension System.Air Suspension System Test Mode Procedure

  5. Using SST, connect terminals 13 (TC) and 4 (CG) of the DLC3.

    NOTICE:
    1. Do not disconnect terminals 12 (TS) and 4 (CG).
    2. Do not connect the incorrect terminals as this will cause damage.
    Text in Illustration
    *a
    		Front view of DLC3

  6. Check each item in the table below by performing the corresponding operation.

    Test Mode (Input Signal Check) Table
    Check Item
    		Operation
    Absorber control switch signal
    		Slowly move absorber control switch from COMF to SPORT and then COMF
    Height control switch signal
    		First press "up" on height control switch and then press "down"
    Height control OFF switch signal
    		Turn height control OFF switch from on to off

  7. Read the output test mode DTCs that are displayed on the multi-information display.

  8. Check the malfunction using the Test Mode DTC Chart below.
    After completing test mode, disconnect SST and turn the ignition switch off.


TEST MODE DTC CHART
HINT:
When entering test mode, the suspension control ECU stores all the test mode DTCs. If the clear conditions for a test mode DTC are met, it is cleared.

  1. If a trouble code is output during the test mode DTC check, check the trouble areas listed for that code. For details of each code, refer to "See page" for the respective "DTC Code" in the chart.

    DTC Code
    		Diagnosis
    		Trouble Area
    		See page
    C1791/91
    		Absorber Control Switch Circuit
    1. Absorber control switch
    2. Absorber control switch circuit
    3. Suspension control ECU
    		LandCruiser RM000003FV900ZX.html
    C1792/92
    		Height Control Switch Circuit
    1. Height control switch
    2. Height control switch circuit
    3. Suspension control ECU
    		LandCruiser RM000001N9A01FX.html
    C1794/94
    		Height Control Off Switch Circuit
    1. Height control mode select switch
    2. Height control mode select switch circuit
    3. Suspension control ECU
    		LandCruiser RM000001SGX016X.html
    C1796/96
    		Front Acceleration Sensor RH Malfunction
    1. Front acceleration sensor RH
    2. Front acceleration sensor RH circuit
    3. Suspension control ECU
    		LandCruiser RM000002PE6033X.html
    C1797/97
    		Front Acceleration Sensor LH Malfunction
    1. Suspension control ECU (Front acceleration sensor LH)
    		LandCruiser RM000002PE6033X.html
    C1798/98
    		Rear Acceleration Sensor Malfunction
    1. Rear acceleration sensor
    2. Rear acceleration sensor circuit
    3. Suspension control ECU
    		LandCruiser RM000002PE6033X.html