2008 Lexus LS 460FACTORY OEM SERVICE PROCEDURE

Problem Symptoms Table

HINT:

  • Use the table below to help determine the cause of the problem symptom. The potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each symptom by checking the suspected areas in the order they are listed. Replace parts as necessary.
  • The Matrix Chart is divided into 2 chapters. When troubleshooting, check Chapter 1 first. If instructions are given in Chapter 1 to proceed to 2, proceed as instructed.
  • If the instruction "Proceed to next circuit inspection shown in problem symptoms table" is given in the flowchart for each circuit, proceed to the next suspected area in the table.
  • If the problem still occurs even though there are no malfunctions in any of the circuits, check the TCM and replace it if necessary.
  • *: When the circuit is defective, a DTC may be output.
  1. CHAPTER 1: ELECTRONIC CIRCUIT MATRIX CHART 
    ELECTRONIC CIRCUIT MATRIX CHART

    Symptom Suspected Area Refer To
    No up-shift(1st -> 2nd) Shift solenoid valve SL1 circuit* P0748, P0778, P0798, P2810, P2819 
    Shift solenoid valve SL5 circuit P0748, P0778, P0798, P2810, P2819 
    TCM ELECTRONIC CIRCUIT INSPECTION PROCEDURE
    No up-shift (2nd -> 3rd) Shift solenoid valve SL1 circuit* P0748, P0778, P0798, P2810, P2819 
    Shift solenoid valve SL3 circuit P0748, P0778, P0798,P2810, P2819 
    TCM ELECTRONIC CIRCUIT INSPECTION PROCEDURE
    No up-shift (3rd -> 4th) Shift solenoid valve SL1 circuit* P0748, P0778, P0798, P2810, P2819 
    Shift solenoid valve SL4 circuit* P0748, P0778, P0798, P2810, P2819 
    TCM ELECTRONIC CIRCUIT INSPECTION PROCEDURE
    No up-shift (4th -> 5th) Shift solenoid valve SL1 circuit* P0748, P0778, P0798, P2810, P2819 
    Shift solenoid valve SL2 circuit* P0748, P0778, P0798, P2810, P2819 
    TCM ELECTRONIC CIRCUIT INSPECTION PROCEDURE
    No up-shift (5th -> 6th) Shift solenoid valve SL2 circuit* P0748, P0778, P2810, P2819 
    Shift solenoid valve SL4 circuit* P0748, P0778, P0798, P2810, P2819 
    TCM ELECTRONIC CIRCUIT INSPECTION PROCEDURE
    No up-shift (6th -> 7th) Shift solenoid valve SL2 circuit* P0748, P0778, P0798, P2810, P2819 
    Shift solenoid valve SL3 circuit* P0748, P0778, P0798, P2810, P2819 
    TCM ELECTRONIC CIRCUIT INSPECTION PROCEDURE
    No up-shift (7th -> 8th) Shift solenoid valve SL2 circuit* P0748, P0778, P0798, P2810, P2819 
    Shift solenoid valve SL5 circuit* P0748, P0778, P0798, P2810, P2819 
    TCM ELECTRONIC CIRCUIT INSPECTION PROCEDURE
    No down-shift (8th -> 7th) Shift solenoid valve SL2 circuit* P0748, P0778, P0798, P2810, P2819 
    Shift solenoid valve SL3 circuit* P0748, P0778, P0798, P2810, P2819 
    TCM ELECTRONIC CIRCUIT INSPECTION PROCEDURE
    No down-shift (7th -> 6th) Shift solenoid valve SL2 circuit* P0748, P0778, P0798, P2810, P2819 
    Shift solenoid valve SL4 circuit* P0748, P0778, P0798, P2810, P2819 
    TCM ELECTRONIC CIRCUIT INSPECTION PROCEDURE
    No down-shift (6th -> 5th) Shift solenoid valve SL1 circuit* P0748, P0778, P0798, P2810, P2819 
    Shift solenoid valve SL2 circuit* P0748, P0778, P0798, P2810, P2819 
    TCM ELECTRONIC CIRCUIT INSPECTION PROCEDURE
    No down-shift (5th -> 4th) Shift solenoid valve SL1 circuit* P0748, P0778, P0798, P2810, P2819 
    Shift solenoid valve SL4 circuit* P0748, P0778, P0798, P2810, P2819 
    TCM ELECTRONIC CIRCUIT INSPECTION PROCEDURE
    No down-shift (4th -> 3rd) Shift solenoid valve SL1 circuit* P0748, P0778, P0798, P2810, P2819 
    Shift solenoid valve SL3 circuit* P0748, P0778, P0798, P2810, P2819 
    TCM ELECTRONIC CIRCUIT INSPECTION PROCEDURE
    No down-shift (3rd -> 2nd) Shift solenoid valve SL1 circuit* P0748, P0778, P0798, P2810, P2819 
    Shift solenoid valve SL5 circuit* P0748, P0778, P0798, P2810 
    TCM ELECTRONIC CIRCUIT INSPECTION PROCEDURE
    No down-shift (2nd -> 1st) Shift solenoid valve SL1 circuit* P0748, P0778, P0798, P2810, P2819 
    TCM ELECTRONIC CIRCUIT INSPECTION PROCEDURE
    No lock-up or no lock-up off Shift solenoid valve SLU circuit* P2759 
    Shift solenoid valve SL circuit* P2769, P2770 
    Stop light switch circuit* P0724 
    TCM ELECTRONIC CIRCUIT INSPECTION PROCEDURE
    No lock-up Shift solenoid valve SLU circuit* P2759 
    Shift solenoid valve SL circuit* P2769, P2770 
    Speed sensor NT circuit* P0715 
    Stop light switch circuit* P0724 
    Engine coolant temperature sensor circuit* DIAGNOSTIC TROUBLE CODE CHART
    TCM ELECTRONIC CIRCUIT INSPECTION PROCEDURE
    No lock-up off Shift solenoid valve SLU circuit* P2759 
    Shift solenoid valve SL circuit* P2769, P2770 
    TCM ELECTRONIC CIRCUIT INSPECTION PROCEDURE
    Shift point too high or too low Shift solenoid valve SLT circuit* P2716 
    Speed sensor NT circuit* P0715 
    Speed sensor NC3 circuit* P2765 
    Speed sensor SP2 circuit* P0500, P0502, P0503 
    ATF temperature sensor circuit* P0710, P0712, P0713 
    Pattern select (PWR) switch circuit PATTERN SELECT SWITCH CIRCUIT 
    Throttle position sensor circuit* DIAGNOSTIC TROUBLE CODE CHART
    TCM ELECTRONIC CIRCUIT INSPECTION PROCEDURE
    Up-shift to 4th from 3rd while engine is cold Engine coolant temperature sensor circuit* DIAGNOSTIC TROUBLE CODE CHART
    TCM ELECTRONIC CIRCUIT INSPECTION PROCEDURE
    Up-shift to 5th from 4th while engine is cold Engine coolant temperature sensor circuit* DIAGNOSTIC TROUBLE CODE CHART
    TCM ELECTRONIC CIRCUIT INSPECTION PROCEDURE
    Up-shift to 6th from 5th while engine is cold Engine coolant temperature sensor circuit* DIAGNOSTIC TROUBLE CODE CHART
    TCM ELECTRONIC CIRCUIT INSPECTION PROCEDURE
    Up-shift to 8th from 7th while engine Is cold Engine coolant temperature sensor circuit* DIAGNOSTIC TROUBLE CODE CHART
    TCM ELECTRONIC CIRCUIT INSPECTION PROCEDURE
    No gear change by shifting into "+" or "-" while shift lever on S Transmission control switch circuit TRANSMISSION CONTROL SWITCH CIRCUIT 
    TCM ELECTRONIC CIRCUIT INSPECTION PROCEDURE
    Harsh engagement (N -> D) Shift solenoid valve SL1 circuit* P0748, P0778, P0798, P2810, P2819 
    Shift solenoid valve SLT circuit* DTC P2716 
    Speed sensor NT circuit* P0715, P0717 
    TCM ELECTRONIC CIRCUIT INSPECTION PROCEDURE
    Harsh engagement (N -> R) Shift solenoid valve SL4 circuit* P0748, P0778, P0798, P2810, P2819 
    Shift solenoid valve SLT circuit* P2716 
    Shift solenoid valve SLU circuit* P2759 
    TCM ELECTRONIC CIRCUIT INSPECTION PROCEDURE
    Harsh engagement (lock-up) Shift solenoid valve SLU circuit* P2759 
    Shift solenoid valve SL circuit* P2769, P2770 
    Speed sensor NT circuit* P0715, P0717 
    Speed sensor NC3 circuit* P0715, P0717 
    Speed sensor SP2 circuit* P0500, P0502, P0503 
    TCM ELECTRONIC CIRCUIT INSPECTION PROCEDURE
    Harsh engagement (any driving position) Shift solenoid valve SL1 circuit* P0748, P0778, P0798, P2810, P2819 
    Shift solenoid valve SL2 circuit* P0748, P0778, P0798, P2810, P2819 
    Shift solenoid valve SL3 circuit* P0748, P0778, P0798, P2810, P2819 
    Shift solenoid valve SL4 circuit* P0748, P0778, P0798, P2810, P2819 
    Shift solenoid valve SL5 circuit* P0748, P0778, P0798, P2810, P2819 
    Shift solenoid valve SLT circuit* P2716 
    Shift solenoid valve SLU circuit* P2759 
    Speed sensor NT circuit* P0715, P0717 
    Throttle position sensor circuit* DIAGNOSTIC TROUBLE CODE CHART
    TCM ELECTRONIC CIRCUIT INSPECTION PROCEDURE
    Poor acceleration Shift solenoid valve SLT circuit* P2716 
    Pattern select (SNOW) switch circuit PATTERN SELECT SWITCH CIRCUIT 
    TCM ELECTRONIC CIRCUIT INSPECTION PROCEDURE
    No engine brake TCM ELECTRONIC CIRCUIT INSPECTION PROCEDURE
    No kick-down TCM ELECTRONIC CIRCUIT INSPECTION PROCEDURE
    Engine stalls when starting off or stopping Shift solenoid valve SLU circuit* P2759 
    TCM ELECTRONIC CIRCUIT INSPECTION PROCEDURE
    ECT SNOW does not operate Shift solenoid valve SLT circuit* P2716 
    Pattern select (SNOW) switch circuit PATTERN SELECT SWITCH CIRCUIT 
    TCM ELECTRONIC CIRCUIT INSPECTION PROCEDURE
    Malfunction in shifting Park/neutral position switch circuit* P0705 
    Transmission control switch circuit TRANSMISSION CONTROL SWITCH CIRCUIT 
    TCM ELECTRONIC CIRCUIT INSPECTION PROCEDURE
    Harsh engagement (1st -> 2nd -> 3rd -> 4th -> 5th -> 6th -> 7th -> 8th) Shift solenoid valve SR circuit* P098, P0986 
    Slip or shudder (5th -> 6th and 6th -> 5th) Shift solenoid valve SR circuit* P0985, P0986 
  2. CHAPTER 2: ON-VEHICLE REPAIR AND OFF-VEHICLE REPAIR 
    ON-VEHICLE REPAIR AND OFF-VEHICLE REPAIR SYMPTOM CHART

    Symptom Suspected Area Refer To
    Vehicle does not move with shift lever in any forward position and reverse position Transmission control rod FLOOR SHIFT ASSEMBLY 
    Manual valve AUTOMATIC TRANSMISSION UNIT 
    Parking lock pawl AUTOMATIC TRANSMISSION UNIT 
    Rear planetary ring gear assembly AUTOMATIC TRANSMISSION UNIT 
    Torque converter clutch TORQUE CONVERTER AND DRIVE PLATE 
    Vehicle does not move with shift lever on R Valve body assembly VALVE BODY ASSEMBLY 
    Reverse clutch (C4) AUTOMATIC TRANSMISSION UNIT 
    No. 2 brake (B2) AUTOMATIC TRANSMISSION UNIT 
    No up-shift(1st -> 2nd) Valve body assembly VALVE BODY ASSEMBLY 
    Forward multiple clutch (C1) AUTOMATIC TRANSMISSION UNIT 
    No. 1 brake (B1) AUTOMATIC TRANSMISSION UNIT 
    No up-shift (2nd -> 3rd) Valve body assembly VALVE BODY ASSEMBLY 
    Forward multiple clutch (C1) AUTOMATIC TRANSMISSION UNIT 
    No. 3 clutch (C3) AUTOMATIC TRANSMISSION UNIT 
    No up-shift (3rd -> 4th) Valve body assembly VALVE BODY ASSEMBLY 
    Forward multiple clutch (C1) AUTOMATIC TRANSMISSION UNIT 
    Reverse clutch (C4) AUTOMATIC TRANSMISSION UNIT 
    No up-shift (4th -> 5th) Valve body assembly VALVE BODY ASSEMBLY 
    Forward multiple clutch (C1) AUTOMATIC TRANSMISSION UNIT 
    No. 2 clutch (C2) AUTOMATIC TRANSMISSION UNIT 
    No up-shift (5th -> 6th) Valve body assembly VALVE BODY ASSEMBLY 
    No. 2 clutch (C2) AUTOMATIC TRANSMISSION UNIT 
    Reverse clutch (C4) AUTOMATIC TRANSMISSION UNIT 
    No up-shift (6th -> 7th) Valve body assembly VALVE BODY ASSEMBLY 
    No. 2 clutch (C2) AUTOMATIC TRANSMISSION UNIT 
    No. 3 clutch (C3) AUTOMATIC TRANSMISSION UNIT 
    No up-shift (7th -> 8th) Valve body assembly VALVE BODY ASSEMBLY 
    No. 2 clutch (C2) AUTOMATIC TRANSMISSION UNIT 
    No. 1 brake (B1) AUTOMATIC TRANSMISSION UNIT 
    No down-shift (8th -> 7th) Valve body assembly VALVE BODY ASSEMBLY 
    No. 2 clutch (C2) AUTOMATIC TRANSMISSION UNIT 
    No. 3 clutch (C3) AUTOMATIC TRANSMISSION UNIT 
    No down-shift (7th -> 6th) Valve body assembly VALVE BODY ASSEMBLY 
    No. 2 clutch (C2) AUTOMATIC TRANSMISSION UNIT 
    Reverse clutch (C4) AUTOMATIC TRANSMISSION UNIT 
    No down-shift (6th -> 5th) Valve body assembly VALVE BODY ASSEMBLY 
    Forward multiple clutch (C1) AUTOMATIC TRANSMISSION UNIT 
    No. 2 clutch (C2) AUTOMATIC TRANSMISSION UNIT 
    No down-shift (5th -> 4th) Valve body assembly VALVE BODY ASSEMBLY 
    Forward multiple clutch (C1) AUTOMATIC TRANSMISSION UNIT 
    Reverse clutch (C4) AUTOMATIC TRANSMISSION UNIT 
    No down-shift (4th -> 3rd) Valve body assembly VALVE BODY ASSEMBLY 
    Forward multiple clutch (C1) AUTOMATIC TRANSMISSION UNIT 
    No. 3 clutch (C3) AUTOMATIC TRANSMISSION UNIT 
    No down-shift (3rd -> 2nd) Valve body assembly VALVE BODY ASSEMBLY 
    Forward multiple clutch (C1) AUTOMATIC TRANSMISSION UNIT 
    No. 1 brake (B1) AUTOMATIC TRANSMISSION UNIT 
    No down-shift (2nd -> 1st) Valve body assembly VALVE BODY ASSEMBLY 
    Forward multiple clutch (C1) AUTOMATIC TRANSMISSION UNIT 
    No. 1 one-way clutch (F1) AUTOMATIC TRANSMISSION UNIT 
    No lock-up or no lock-up off Valve body assembly VALVE BODY ASSEMBLY 
    Torque converter clutch TORQUE CONVERTER AND DRIVE PLATE 
    Harsh engagement (N -> D) Valve body assembly VALVE BODY ASSEMBLY 
    Forward multiple clutch (C1) AUTOMATIC TRANSMISSION UNIT 
    No. 1 one-way clutch (F1) AUTOMATIC TRANSMISSION UNIT 
    Harsh engagement (N -> R) Valve body assembly VALVE BODY ASSEMBLY 
    Reverse clutch (C4) AUTOMATIC TRANSMISSION UNIT 
    No. 2 brake (B2) AUTOMATIC TRANSMISSION UNIT 
    No. 1 one-way clutch (F1) AUTOMATIC TRANSMISSION UNIT 
    Harsh engagement (lock-up) Valve body assembly VALVE BODY ASSEMBLY 
    Torque converter clutch TORQUE CONVERTER AND DRIVE PLATE 
    Harsh engagement (1st -> 2nd -> 3rd -> 4th -> 5th -> 6th -> 7th -> 8th) Valve body assembly VALVE BODY ASSEMBLY 
    Harsh engagement (1st -> 2nd) Valve body assembly VALVE BODY ASSEMBLY 
    Forward multiple clutch (C1) AUTOMATIC TRANSMISSION UNIT 
    No. 1 brake (B1) AUTOMATIC TRANSMISSION UNIT 
    No. 1 one-way clutch (F1) AUTOMATIC TRANSMISSION UNIT 
    Harsh engagement (2nd -> 3rd) Valve body assembly VALVE BODY ASSEMBLY 
    Forward multiple clutch (C1) AUTOMATIC TRANSMISSION UNIT 
    No. 3 clutch (C3) AUTOMATIC TRANSMISSION UNIT 
    No. 1 one-way clutch (F1) AUTOMATIC TRANSMISSION UNIT 
    Harsh engagement (3rd -> 4th) Valve body assembly VALVE BODY ASSEMBLY 
    Forward multiple clutch (C1) AUTOMATIC TRANSMISSION UNIT 
    Reverse clutch (C4) AUTOMATIC TRANSMISSION UNIT 
    No. 1 one-way clutch (F1) AUTOMATIC TRANSMISSION UNIT 
    Harsh engagement (4th -> 5th) Valve body assembly VALVE BODY ASSEMBLY 
    Forward multiple clutch (C1) AUTOMATIC TRANSMISSION UNIT 
    No. 2 clutch (C2) AUTOMATIC TRANSMISSION UNIT 
    No. 1 one-way clutch (F1) AUTOMATIC TRANSMISSION UNIT 
    Harsh engagement (5th -> 6th) Valve body assembly VALVE BODY ASSEMBLY 
    No. 2 clutch (C2) AUTOMATIC TRANSMISSION UNIT 
    Reverse clutch (C4) AUTOMATIC TRANSMISSION UNIT 
    No. 1 one-way clutch (F1) AUTOMATIC TRANSMISSION UNIT 
    Harsh engagement (6th -> 7th) Valve body assembly VALVE BODY ASSEMBLY 
    No. 2 clutch (C2) AUTOMATIC TRANSMISSION UNIT 
    No. 3 clutch (C3) AUTOMATIC TRANSMISSION UNIT 
    No. 1 one-way clutch (F1) AUTOMATIC TRANSMISSION UNIT 
    Harsh engagement (7th -> 8th) Valve body assembly VALVE BODY ASSEMBLY 
    No. 2 clutch (C2) AUTOMATIC TRANSMISSION UNIT 
    No. 1 brake (B1) AUTOMATIC TRANSMISSION UNIT 
    No. 1 one-way clutch (F1) AUTOMATIC TRANSMISSION UNIT 
    Slip or shudder (shift lever on R) Reverse clutch (C4) AUTOMATIC TRANSMISSION UNIT 
    No. 2 brake (B2) AUTOMATIC TRANSMISSION UNIT 
    Torque converter clutch TORQUE CONVERTER AND DRIVE PLATE 
    Slip or shudder (1st) Forward multiple clutch (C1) AUTOMATIC TRANSMISSION UNIT 
    No. 1 one-way clutch (F1) AUTOMATIC TRANSMISSION UNIT 
    Torque converter clutch TORQUE CONVERTER AND DRIVE PLATE 
    Slip or shudder (2nd) Forward multiple clutch (C1) AUTOMATIC TRANSMISSION UNIT 
    No. 1 brake (B1) AUTOMATIC TRANSMISSION UNIT 
    Torque converter clutch TORQUE CONVERTER AND DRIVE PLATE 
    Slip or shudder (3rd) Forward multiple clutch (C1) AUTOMATIC TRANSMISSION UNIT 
    No. 3 clutch (C3) AUTOMATIC TRANSMISSION UNIT 
    Torque converter clutch TORQUE CONVERTER AND DRIVE PLATE 
    Slip or shudder (4th) Forward multiple clutch (C1) AUTOMATIC TRANSMISSION UNIT 
    Reverse clutch (C4) AUTOMATIC TRANSMISSION UNIT 
    Torque converter clutch TORQUE CONVERTER AND DRIVE PLATE 
    Slip or shudder (5th) Forward multiple clutch (C1) AUTOMATIC TRANSMISSION UNIT 
    No. 2 clutch (C2) AUTOMATIC TRANSMISSION UNIT 
    Torque converter clutch TORQUE CONVERTER AND DRIVE PLATE 
    Slip or shudder (6th) No. 2 clutch (C2) AUTOMATIC TRANSMISSION UNIT 
    Reverse clutch (C4) AUTOMATIC TRANSMISSION UNIT 
    Torque converter clutch TORQUE CONVERTER AND DRIVE PLATE 
    Slip or shudder (7th) No. 2 clutch (C2) AUTOMATIC TRANSMISSION UNIT 
    No. 3 clutch (C3) AUTOMATIC TRANSMISSION UNIT 
    Torque converter clutch TORQUE CONVERTER AND DRIVE PLATE 
    Slip or shudder (8th) No. 2 clutch (C2) AUTOMATIC TRANSMISSION UNIT 
    No. 1 brake (B1) AUTOMATIC TRANSMISSION UNIT 
    Torque converter clutch TORQUE CONVERTER AND DRIVE PLATE 
    No engine braking (1st: shift lever on 1) Valve body assembly VALVE BODY ASSEMBLY 
    Forward multiple clutch (C1) AUTOMATIC TRANSMISSION UNIT 
    No. 2 brake (B2) AUTOMATIC TRANSMISSION UNIT 
    No engine braking (2nd: shift lever on 2) Valve body assembly VALVE BODY ASSEMBLY 
    Forward multiple clutch (C1) AUTOMATIC TRANSMISSION UNIT 
    No. 1 brake (B1) AUTOMATIC TRANSMISSION UNIT 
    No engine braking (3rd: shift lever on 3) Valve body assembly VALVE BODY ASSEMBLY 
    Forward multiple clutch (C1) AUTOMATIC TRANSMISSION UNIT 
    No. 3 clutch (C3) AUTOMATIC TRANSMISSION UNIT 
    No engine braking (4th: shift lever on 4) Valve body assembly VALVE BODY ASSEMBLY 
    Forward multiple clutch (C1) AUTOMATIC TRANSMISSION UNIT 
    Reverse clutch (C4) AUTOMATIC TRANSMISSION UNIT 
    No engine braking (5th: shift lever on 5) Valve body assembly VALVE BODY ASSEMBLY 
    Forward multiple clutch (C1) AUTOMATIC TRANSMISSION UNIT 
    No. 2 clutch (C2) AUTOMATIC TRANSMISSION UNIT 
    No engine braking (6th: shift lever on 6) Valve body assembly VALVE BODY ASSEMBLY 
    No. 2 clutch (C2) AUTOMATIC TRANSMISSION UNIT 
    Reverse clutch (C4) AUTOMATIC TRANSMISSION UNIT 
    No kick-down Valve body assembly VALVE BODY ASSEMBLY 
    Shift point too high or too low Valve body assembly VALVE BODY ASSEMBLY 
    Poor acceleration (all positions) Valve body assembly VALVE BODY ASSEMBLY 
    Torque converter clutch TORQUE CONVERTER AND DRIVE PLATE 
    Engine stalls when starting off or stopping Valve body assembly VALVE BODY ASSEMBLY 
    Torque converter clutch TORQUE CONVERTER AND DRIVE PLATE 
Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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