2007 Lexus GS 430FACTORY OEM SERVICE PROCEDURE

Problem Symptoms Table

HINT:

  • If a normal code is displayed during the diagnostic trouble code check although the trouble still occurs, check the electrical circuits for each symptom in the order given in the charts on the following pages and proceed to the page given for troubleshooting.
  • The Matrix Chart is divided into 2 chapters.
  • Refer to the table below when the trouble cause is considered to be electrical.
  • If the instruction "Proceed to next circuit inspection shown on matrix chart" is given in the flow chart of each circuit, proceed to the circuit with the next highest number in the table to continue the check.
  • If the trouble still occurs even though there are no abnormalities in any of the other circuits, check and replace the ECM.
  • *1: When the circuit on which mark *1 is attached is a malfunction, DTC could be output.
  1. Chapter 1: Electronic Circuit Matrix Chart 
    PROBLEM SYMPTOMS TABLE

    Symptom Suspected Area See
    No up-shift (1st -> 2nd) 1. Shift solenoid valve (S1) circuit *1 DTC P0973 SHIFT SOLENOID "A" CONTROL CIRCUIT LOW (SHIFT SOLENOID VALVE S1); DTC P0974: SHIFT SOLENOID "A" CONTROL CIRCUIT HIGH (SHIFT SOLENOID) 
    2. ECM ELECTRONIC CIRCUIT INSPECTION PROCEDURE
    No up-shift (2nd -> 3rd) 1. Shift solenoid valve (S2) circuit *1 INSPECTION PROCEDURE
    2. ECM ELECTRONIC CIRCUIT INSPECTION PROCEDURE
    No up-shift (3rd -> 4th) 1. Shift solenoid valve (S3) circuit *1 INSPECTION PROCEDURE
    2. Engine coolant temp, sensor circuit *1 DATA LIST / ACTIVE TEST
    3. ECM ELECTRONIC CIRCUIT INSPECTION PROCEDURE
    No up-shift (4th -> 5th) 1. Shift solenoid valve (S4) circuit *1 INSPECTION PROCEDURE
    2. Shift solenoid valve (SR) circuit *1 INSPECTION PROCEDURE
    3. Shift solenoid valve (SL1) circuit *1 INSPECTION PROCEDURE
    4. Shift solenoid valve (SL2) circuit *1 INSPECTION PROCEDURE
    5. ECM ELECTRONIC CIRCUIT INSPECTION PROCEDURE
    No up-shift (5th -> 6th) 1. Park/neutral position switch circuit *1 INSPECTION PROCEDURE
    2. Engine coolant temp, sensor circuit *1 DATA LIST / ACTIVE TEST
    3. Shift solenoid valve (S2) circuit *1 INSPECTION PROCEDURE
    4. ECM ELECTRONIC CIRCUIT INSPECTION PROCEDURE
    No down-shift (6th -> 5th) 1. Park/neutral position switch circuit *1 INSPECTION PROCEDURE
    2. Shift solenoid valve (S2) circuit *1 INSPECTION PROCEDURE
    3. ECM ELECTRONIC CIRCUIT INSPECTION PROCEDURE
    No down-shift (5th -> 4th) 1. Shift solenoid valve (S4) circuit *1 INSPECTION PROCEDURE
    2. Shift solenoid valve (SR) circuit *1 INSPECTION PROCEDURE
    3. Shift solenoid valve (SL1) circuit *1 INSPECTION PROCEDURE
    4. Shift solenoid valve (SL2) circuit *1 INSPECTION PROCEDURE
    5. ECM ELECTRONIC CIRCUIT INSPECTION PROCEDURE
    No down-shift (4th -> 3rd) 1. Shift solenoid valve (S3) circuit *1 INSPECTION PROCEDURE
    2. ECM ELECTRONIC CIRCUIT INSPECTION PROCEDURE
    No down-shift (3rd -> 2nd) 1. Shift solenoid valve (S2) circuit *1 INSPECTION PROCEDURE
    2. ECM ELECTRONIC CIRCUIT INSPECTION PROCEDURE
    No down-shift (2nd -> 1st) 1. Shift solenoid valve (S1) circuit *1 DTC P0973 SHIFT SOLENOID "A" CONTROL CIRCUIT LOW (SHIFT SOLENOID VALVE S1); DTC P0974: SHIFT SOLENOID "A" CONTROL CIRCUIT HIGH (SHIFT SOLENOID) 
    2. ECM ELECTRONIC CIRCUIT INSPECTION PROCEDURE
    No lock up or No lock up off 1. Shift solenoid valve (SLU) circuit *1 INSPECTION PROCEDURE
    2. Stop light switch circuit *1 INSPECTION PROCEDURE
    3. ECM ELECTRONIC CIRCUIT INSPECTION PROCEDURE
    No lock up 1. Shift solenoid valve (SLU) circuit *1 INSPECTION PROCEDURE
    2. Engine coolant temp, sensor circuit *1 DATA LIST / ACTIVE TEST
    3. Stop light switch circuit *1 INSPECTION PROCEDURE
    4. Speed sensor NT circuit *1 COMPONENT OPERATING RANGE
    5. ECM ELECTRONIC CIRCUIT INSPECTION PROCEDURE
    No lock up off 1. Shift solenoid valve (SLU) circuit *1 INSPECTION PROCEDURE
    2. ECM ELECTRONIC CIRCUIT INSPECTION PROCEDURE
    Shift point too high or too law 1. Shift solenoid valve (SLT) circuit *1 INSPECTION PROCEDURE
    2. Speed sensor NT circuit *1 COMPONENT OPERATING RANGE
    3. Speed sensor SP2 circuit *1 DIAGNOSTIC TROUBLE CODE CHART
    4. Throttle position sensor circuit *1 DATA LIST / ACTIVE TEST
    5. Pattern select (PWR) switch circuit INSPECTION PROCEDURE
    6. ATF temperature sensor circuit *1 INSPECTION PROCEDURE
    7. ECM ELECTRONIC CIRCUIT INSPECTION PROCEDURE
    Up-shift to 4th from 3rd while engine is cold 1. Engine coolant temp, sensor circuit *1 DATA LIST / ACTIVE TEST
    2. ECM ELECTRONIC CIRCUIT INSPECTION PROCEDURE
    Up-shift to 5th from 4th while engine is cold 1. Engine coolant temp, sensor circuit *1 DATA LIST / ACTIVE TEST
    2. ECM ELECTRONIC CIRCUIT INSPECTION PROCEDURE
    No gear change by shifting into "+" or "-" while the shifting lever is in the S position 1. Transmission control switch circuit MONITOR DESCRIPTION
    2. ECM ELECTRONIC CIRCUIT INSPECTION PROCEDURE
    Harsh engagement (N -> D) 1. Shift solenoid valve (SLT) circuit *1 INSPECTION PROCEDURE
    2. Speed sensor NT circuit *1 COMPONENT OPERATING RANGE
    3. ECM ELECTRONIC CIRCUIT INSPECTION PROCEDURE
    Harsh engagement (Lock up) 1. Speed sensor NT circuit *1 COMPONENT OPERATING RANGE
    2. Speed sensor SP2 circuit *1 DIAGNOSTIC TROUBLE CODE CHART
    3. Shift solenoid valve (SLU) circuit *1 INSPECTION PROCEDURE
    4. ECM ELECTRONIC CIRCUIT INSPECTION PROCEDURE
    Harsh engagement (Any driving position) 1. Throttle position sensor circuit *1 DATA LIST / ACTIVE TEST
    2. Shift solenoid valve (SL1) circuit *1 INSPECTION PROCEDURE
    3. Shift solenoid valve (SL2) circuit *1 INSPECTION PROCEDURE
    4. Shift solenoid valve (SLU) circuit *1 INSPECTION PROCEDURE
    5. Shift solenoid valve (SLT) circuit *1 INSPECTION PROCEDURE
    6. Speed sensor NT circuit *1 COMPONENT OPERATING RANGE
    7. ECM ELECTRONIC CIRCUIT INSPECTION PROCEDURE
    Poor acceleration 1. Shift solenoid valve (SLT) circuit *1 INSPECTION PROCEDURE
    2. Pattern select (SNOW) switch circuit INSPECTION PROCEDURE
    3. ECM ELECTRONIC CIRCUIT INSPECTION PROCEDURE
    No engine brake ECM ELECTRONIC CIRCUIT INSPECTION PROCEDURE
    No kick-down ECM ELECTRONIC CIRCUIT INSPECTION PROCEDURE
    Engine stalls when starting off or stopping 1. Shift solenoid valve (SLU) circuit *1 INSPECTION PROCEDURE
    2. ECM ELECTRONIC CIRCUIT INSPECTION PROCEDURE
    ECT SNOW does not operate 1. Shift solenoid valve (SLT) circuit *1 INSPECTION PROCEDURE
    2. Pattern select (SNOW) switch circuit INSPECTION PROCEDURE
    3. ECM ELECTRONIC CIRCUIT INSPECTION PROCEDURE
    Malfunction in shifting 1. Park/neutral position switch circuit *1 INSPECTION PROCEDURE
    2. Transmission control switch circuit MONITOR DESCRIPTION
    3. ECM ELECTRONIC CIRCUIT INSPECTION PROCEDURE
    Harsh engagement (1st -> 2nd -> 3rd -> 4th -> 5th) Shift solenoid valve (SR) circuit *1 INSPECTION PROCEDURE
    Slip or shudder (5th -> 6th and 6th -> 5th) Shift solenoid valve (SR) circuit *1 INSPECTION PROCEDURE
  2. Chapter 2: On-Vehicle Repair and Off-Vehicle Repair 
    PROBLEM SYMPTOMS TABLE - ON-VEHICLE REPAIR AND OFF-VEHICLE REPAIR

    Symptom Suspected Area See
    Vehicle does not move in any forward position and reverse positions 1. Transmission control rod ON-VEHICLE INSPECTION
    2. Manual valve INSTALLATION
    3. Parking lock pawl INSTALLATION
    4. Rear planetary gear unit INSTALLATION
    5. Torque converter clutch COMPONENTS
    Vehicle does not move in R position 1. Valve body assembly COMPONENTS
    2. Brake No.4 (B4) INSTALLATION
    No up-shift (1st->2nd) 1. Valve body assembly COMPONENTS
    2. Brake No.3 (B3) INSTALLATION
    3. One-way clutch No.1 (F1) INSTALLATION
    4. One-way clutch No.2 (F2) INSTALLATION
    No up-shift (2nd -> 3rd) 1. Valve body assembly COMPONENTS
    2. Clutch No.3 (C3) INSTALLATION
    No up-shift (3rd -> 4th) 1. Valve body assembly COMPONENTS
    2. Clutch No.2 (C2) INSTALLATION
    No up-shift (4th -> 5th) 1. Valve body assembly COMPONENTS
    2. Brake No.1 (B1) INSTALLATION
    No up-shift (5th -> 6th) 1. Valve body assembly COMPONENTS
    2. Brake No.2 (B2) INSTALLATION
    No down-shift (6th -> 5th) Valve body assembly COMPONENTS
    No down-shift (5th -> 4th) Valve body assembly COMPONENTS
    No down-shift (4th -> 3rd) Valve body assembly COMPONENTS
    No down-shift (3rd -> 2nd) Valve body assembly COMPONENTS
    No down-shift (2nd -> 1st) Valve body assembly COMPONENTS
    No lock up or No lock up off 1. Valve body assembly COMPONENTS
    2. Torque converter clutch COMPONENTS
    Harsh engagement (N -> D) 1. Valve body assembly COMPONENTS
    2. C1 accumulator INSTALLATION
    3. Clutch No.1 (C1) INSTALLATION
    4. One-way clutch No.3 (F3) INSTALLATION
    5. One-way clutch No.4 (F4) INSTALLATION
    Harsh engagement (Lock up) 1. Valve body assembly COMPONENTS
    2. Torque converter clutch COMPONENTS
    Harsh engagement (N -> R) 1. Valve body assembly COMPONENTS
    2. C3 accumulator INSTALLATION
    3. Clutch No.3 (C3) INSTALLATION
    4. Brake No.4 (B4) INSTALLATION
    5. One-way clutch No.1 (F1) INSTALLATION
    Harsh engagement (1st -> 2nd -> 3rd -> 4th -> 5th -> 6th) Valve body assembly COMPONENTS
    Harsh engagement (1st -> 2nd) 1. Valve body assembly COMPONENTS
    2. B3 accumulator INSTALLATION
    3. Brake No.3 (B3) INSTALLATION
    4. One-way clutch No.1 (F1) INSTALLATION
    5. One-way clutch No.2 (F2) INSTALLATION
    Harsh engagement (2nd -> 3rd) 1. Valve body assembly COMPONENTS
    2. C3 accumulator INSTALLATION
    3. Clutch No.3 (C3) INSTALLATION
    Harsh engagement (3rd -> 4th) 1. Valve body assembly COMPONENTS
    2. C2 accumulator INSTALLATION
    3. Clutch No.2 (C2) INSTALLATION
    Harsh engagement (4th -> 5th) 1. Valve body assembly COMPONENTS
    2. B1 accumulator INSTALLATION
    3. Brake No.1 (B1) INSTALLATION
    Harsh engagement (5th -> 6th) 1. Valve body assembly COMPONENTS
    2. B2 accumulator INSTALLATION
    3. Brake No.2 (B2) INSTALLATION
    Harsh engagement (6th -> 5th) 1. Valve body assembly COMPONENTS
    2. C3 accumulator INSTALLATION
    3. Clutch No.3 (C3) INSTALLATION
    Slip or shudder (Forward and reverse: After warm-up) 1. Valve body assembly COMPONENTS
    2. Oil strainer INSTALLATION
    3. One-way clutch No.1 (F1) INSTALLATION
    4. Clutch No.3 (C3) INSTALLATION
    5. Torque converter clutch COMPONENTS
    Slip or shudder (Particular position: Just after engine starts) Torque converter clutch COMPONENTS
    Slip or shudder (R position) 1. Brake No.4 (B4) INSTALLATION
    2. One-way clutch No.1 (F1) INSTALLATION
    3. Clutch No.3 (C3) INSTALLATION
    Slip or shudder (1st) 1. Clutch No.1 (C1) INSTALLATION
    2. One-way clutch No.3 (F3) INSTALLATION
    3. One-way clutch No.4 (F4) INSTALLATION
    Slip or shudder (2nd) 1. Clutch No.1 (C1) INSTALLATION
    2. Brake No.3 (B3) INSTALLATION
    3. One-way clutch No.1 (F1) INSTALLATION
    4. One-way clutch No.2 (F2) INSTALLATION
    5. One-way clutch No.4 (F4) INSTALLATION
    Slip or shudder (3rd) 1. Clutch No.1 (C1) INSTALLATION
    2. Clutch No.3 (C3) INSTALLATION
    3. One-way clutch No.1 (F1) INSTALLATION
    4. One-way clutch No.4 (F4) INSTALLATION
    Slip or shudder (4th) 1. Clutch No.1 (C1) INSTALLATION
    2. Clutch No.2 (C2) INSTALLATION
    3. One-way clutch No.4 (F4) INSTALLATION
    Slip or shudder (5th) 1. Clutch No.2 (C2) INSTALLATION
    2. Clutch No.3 (C3) INSTALLATION
    3. Brake No.1 (B1) INSTALLATION
    Slip or shudder (6th) 1. Clutch No.2 (C2) INSTALLATION
    2. Brake No.2 (B2) INSTALLATION
    No engine braking (1st +- 4th: S position) Clutch No.4 (C4) INSTALLATION
    No engine braking (1st: 1 position) 1. Valve body assembly COMPONENTS
    2. Brake No.4 (B4) INSTALLATION
    No engine braking (2nd: 2 position) 1. Valve body assembly COMPONENTS
    2. Brake No.2 (B2) INSTALLATION
    No engine braking (3rd: 3 position) 1. Valve body assembly COMPONENTS
    2. Brake No.1 (B1) INSTALLATION
    No engine braking (4th: 4 position) Valve body assembly COMPONENTS
    No kick-down Valve body assembly COMPONENTS
    Shift point too high or too low Valve body assembly COMPONENTS
    Poor acceleration (All positions) 1. Valve body assembly COMPONENTS
    2. Torque converter clutch COMPONENTS
    Poor acceleration (6th) 1. Brake No.2 (B2) INSTALLATION
    2. Clutch No.2 (C2) INSTALLATION
    3. Front planetary gear unit INSTALLATION
    Engine stalls when starting off or stopping 1. Valve body assembly COMPONENTS
    2. Torque converter clutch COMPONENTS
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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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