LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Lexus >> 2008 >> GX 470 >> Repair and Diagnosis >> Engine Performance >> Engine Control System >> SFI System >> How To Proceed With Troubleshooting
April 5, 2026: LEMON Manuals is launched! Read the announcement.

How To Proceed With Troubleshooting

HINT:

*: Use the Techstream.

  1. VEHICLE BROUGHT TO WORKSHOP 
  2. CONNECT TECHSTREAM TO DLC3* 

    HINT:

    If the display indicates a communication fault in the tester, inspect the DLC3.

  3. CHECK DTC AND FREEZE FRAME DATA* 

    HINT.

    Record or print DTCs and freeze frame data, if necessary (See DTC CHECK/CLEAR  ).

  4. CLEAR DTC AND FREEZE FRAME DATA* 

    HINT:

    Refer to DTC CHECK/CLEAR  (See .

  5. CONDUCT VISUAL INSPECTION 
  6. SET CHECK MODE DIAGNOSIS* 

    HINT:

    Refer to CHECK MODE PROCEDURE  (See .

  7. CONFIRM PROBLEM SYMPTOMS 

    HINT:

    If the engine does not start, first perform the "check DTC" procedures and "conduct basic inspection" procedures below.

    RESULT REFERENCE

    Result Proceed to
    Malfunction does not occur A
    Malfunction occurs B

    B: GO TO STEP  9

    A: Go to next step 

  8. SIMULATE SYMPTOMS 
  9. CHECK DTC* 

    HINT:

    Refer to DTC CHECK/CLEAR  (See

    RESULT REFERENCE

    Result Proceed to
    Malfunction code A
    No code B

    B: GO TO STEP  11

    A: Go to next step 

  10. REFER TO DTC CHART 

    HINT:

    Refer to DIAGNOSTIC TROUBLE CODE CHART  (See .

    NEXT: GO TO STEP  13

  11. CONDUCT BASIC INSPECTION 

    HINT:

    Refer to BASIC INSPECTION  (See .

    RESULT REFERENCE

    Result Proceed to
    Malfunctioning parts not confirmed A
    Malfunctioning parts confirmed B

    B: GO TO STEP  16

    A: Go to next step 

  12. REFER TO PROBLEM SYMPTOMS TABLE 

    HINT:

    Refer to PROBLEM SYMPTOMS TABLE  (See .

    RESULT REFERENCE

    Result Proceed to
    Malfunctioning circuit confirmed A
    Malfunctioning parts confirmed B

    B: GO TO STEP  16

    A: Go to next step 

  13. CHECK ECM POWER SOURCE CIRCUIT 

    HINT:

    Refer to ECM POWER SOURCE CIRCUIT  (See .

  14. CONDUCT CIRCUIT INSPECTION 
    RESULT REFERENCE

    Result Proceed to
    Malfunction not confirmed A
    Malfunction confirmed B

    B: GO TO STEP  17

    A: Go to next step 

  15. CHECK FOR INTERMITTENT PROBLEMS 

    HINT:

    Refer to CHECK FOR INTERMITTENT PROBLEMS  (See .

    NEXT: GO TO STEP  17

  16. CONDUCT PARTS INSPECTION 
  17. IDENTIFY PROBLEM 
  18. ADJUST, REPAIR OR REPLACE 
  19. CONDUCT CONFIRMATION TEST 

    NEXT: END