Section 400 (Electronic Modulated Suspension - Diagnosis): Pre-Check

WARNING: This page is about a different car, the 2004 Lexus ES 330. However, it is still accessible from the selected car via links, so may be relevant.

DIAGNOSIS SYSTEM
1. Check the TEM output (LED lightening check).
  1. Connect the LED and resistor in series between terminals TEM and CG of the DLC3.
    
    Fig 1: Connecting LED & Resistor In Series Between Terminals TEM And CG
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    NOTE: If connected reversely, the LED does not light.
    
    HINT:
    - Use the LED whose recommended operating current is 10 - 20 mA.
    - The 500 Ω to 1 kΩ resistor must be used.
  2. Turn the ignition switch to ON, and check that the LED lights for about 2 seconds.
  HINT: If the LED does not light, inspect the TEM circuit (See TEM TERMINAL CIRCUIT ).
2. In case of not using hand-held tester: check the DTC.
  1. Check the battery positive voltage.
    Battery positive voltage: 10 - 14 V (Engine stopped)
  2. After driving the vehicle, using SST, connect terminals Tc and CG of the DLC3.
    SST 09843- 18040
    
    Fig 2: Connecting Terminals Tc & CG
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    HINT:
    - Do not stop the engine.
    - Under this condition, the ignition switch is ON.
    NOTE: Wrong connection of the connector may cause a malfunction. With extreme caution, connect the connector.
  3. Connect the LED and resistor in series between terminals TEM and CG of the DLC3.
    
    Fig 3: Connecting LED & Resistor In Series Between Terminals TEM And CG
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. Check the number that the LED blinks.
    HINT:
    - When the code is normal, the LED keeps on for 0.25 ponds and off for 0.25 seconds repeatedly.
    - When more than 2 diagnosis codes are detected, the diagnosis codes are displayed in order from the smallest number.
    - If no code appears, inspect the TC circuit (See TC TERMINAL CIRCUIT ).
    - Codes are explained in the code table on DIAGNOSTIC TROUBLE CODE CHART .
    Fig 4: Checking Number Of LED Blinks (Normal Code)
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    Fig 5: Example Of Malfunction Code 21 & 23
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  5. Turn the ignition switch to ON.
  6. Disconnect the SST from terminals Tc and CG of the DLC3.
    SST 09843- 18040
  7. Disconnect the LED and resistor from the terming TEM and CG of the DLC3.
    HINT: Confirm that the connected LED is off.
  8. When an abnormal code is output, inspect the function, absorber control ECU and input signal.
3. In case of using the hand-held tester: Check the DTC.
  1. Hook up the hand-held tester to the DLC3.
  2. Turn the ignition switch to ON.
  3. Read the DTC by following the prompts on the tester screen.
    HINT: Please Refer to the hand-held tester operator's manual for further details .
4. In case of not using hand-held tester: Clear the DTC.
  1. Using SST, it connects the terminal Tc and CG of the DLC3.
    SST 09843- 18040
  2. Turn the ignition switch to ON.
  3. Clear DTC stored in ECU by depressing the brake pedal 8 or more times within 5 sec.
    
    Fig 6: Depressing Brake Pedal
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. Check that DTC output the normal code. (See step 1 - ( b)).
  5. Remove the SST from the DLC3.
    SST 09843- 18040
  HINT: Disconnecting the battery cable during repairs will not erase the DTC in the ECU.
5. In case of using hand-held tester: Clear the DTC.
  1. Hook up the hand-held tester to the DLC3.
  2. Turn the ignition switch to ON.
  3. Operate the hand-held tester to erase the codes.
  HINT: Please Refer to the hand-held tester operator's manual for further details .
DATA LIST
HINT: IG must be turned ON to observe data suing a hand-held tester. The vehicle is considered to be placed on a flat level surface.

Fig 7: Data List Chart (1 Of 2)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 8: Data List Chart (2 Of 2)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
ACTIVE TEST LIST
HINT: IG must be turned ON to proceed Active Test using a hand-held tester.

Fig 9: Active Test List Chart
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
CHECK INPUT SIGNAL (TEST MODE CHECK)
HINT: This function checks if signals from the stop lamp switch assy and absorber control switch assy etc. are being input normally to the ECU.
1. In case of not using hand-held tester: Check the input signal (test mode check).
  1. Check the battery positive voltage.
    Battery positive voltage: 10 - 14 V (Engine stopped)
  2. Turn the ignition switch to OFF.
  3. Connect the LED and resistor in series between terminals TEM and CG of the DLC3.
    
    Fig 10: Connecting LED & Resistor In Series Between Terminals TEM And CG
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. Set each of the check items in Fig 12 below to the condition of operation (A).
  5. Using SST, connect terminals Ts and CG of the DLC3 (TEST mode).
    SST 09843- 18040
    
    Fig 11: Connecting Terminals Ts & CG
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  6. Start the engine.
  7. Set each check items to the condition of operation (B).
    HINT:
    - The LED lights for 1 sec. before it blinks.
    - If operation (B) has not been performed, DTC will indicate.
    NOTE: Do not turn off the ignition switch OFF. Diagnosis code are erased by turning the ignition switch OFF.
    
    Fig 12: Checking Item & Operation Chart
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  8. Using SST, connect terminals Tc and CG of the DLC3.
    SST 09843- 18040
  9. Check the number that the LED blinks.
    HINT: When the code is normal, the LED turns on for 0.25 sec. and off for 0.25 sec. repeatedly.
    
    Fig 13: Checking Number LED Blinks
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    Fig 14: Example Of Malfunction Code 82
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  10. With the ignition switch to OFF, disconnect the SST from terminals Tc and CG of the DLC3.
    SST 09843- 18040
  11. Disconnect the SST from terminals Ts and CG of the DLC3.
    SST 09843- 18040
  12. Disconnect the LED and resistor from the terminals TEM and CG of the DLC3.
2. In case of using hand-held tester:
  Check the input signal (test mode).
  1. Hook up the hand-held tester to the DLC3.
  2. Perform step 4 - (a)-(2) to (a)-(7) under step 4 .
  3. Read the DTC on the tester screen.
    HINT: Please Refer to the hand-held tester operator's manual for further details .
DTC of the input signal check

If a malfunction code is displayed during the teat mode DTC check, check the circuit listed for that code. .

Fig 15: DTC Troubleshooting Chart
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
CHECK DAMPING FORCE CONTROLLING CONDITION
1. In case of not using hand-held tester: Check the damping force controlling condition.
  1. Using SST, connect terminals Ts and CG of the DLC3 with the ignition switch OFF (TEST mode).
    SST 09843- 18040
    
    Fig 16: Connecting Terminals Ts & CG
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. Start the engine.
    Under this condition, the absorber control actuator position becomes 1 (Soft).
  3. Starting from the above mentioned position, as the brake pedal is depressed, the absorber control actuator position increase (1 --> 2 --> 3 -->... 15 --> 16). At this time, bounce the vehicle and check that the shock absorber is becoming harder.
    HINT:
    - To hold the absorber control actuator at a specific position, adjust it to the position using the above mentioned procedure then increase the vehicle speed to over 5 km/h.
      After that the absorber control actuator position does not change until the ignition switch is turned to OFF.
    - If the absorber control actuator does not operate, inspect the absorber control actuator circuit and absorber control ECU.
  4. Disconnect the SST from terminals Ts and CG of the DLC3.
    SST 09843- 18040
FAIL-SAFE FUNCTION
1. When short circuit of the shock absorber control actuator is detected, the shock absorber control actuator located on the other side of the detected shock absorber is set at position (step) 8. The shock absorber control actuator remains at position (step) 8 until the ignition switch becomes OFF.