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Speedometer Malfunction: Wiring Diagram

Fig 1: Speedometer - Wiring Diagram
G04050015Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

HINT:

Before starting circuit inspection, check tire size and tire pressure.

  1. PERFORM ACTIVE TEST BY INTELLIGENT TESTER 
    1. Connect the tester to the DLC3.
    2. Engine switch on (IG).
    3. Turn the tester ON.
    4. Enter the following menus: DIAGNOSIS / OBD/MOBD / METER / ACTIVE TEST
    5. Check the values by referring to the table below.

    METER: 

    METER DIAGNOSTIC REFERENCE

    Item Test Details Diagnostic Note
    SPEED METER 0, 40, (24), 80 (48), 120 (72), 160 (96), 200 (120) km/h (mph) -

    OK: 

    Needle indication is within the allowable range. 

    NG : REPLACE COMBINATION METER ASSEMBLY 

    OK : Go To Next Step 

  2. READ VALUE OF INTELLIGENT TESTER 
    1. Connect the intelligent tester to the DLC3.
    2. Engine switch on (IG).
    3. Turn the tester ON.
    4. Enter the following menus: DIAGNOSIS / OBD/MOBD / METER / DATA LIST.
    5. Check the values by referring to the table below.

    METER: 

    METER DISPLAY DIAGNOSTIC REFERENCE

    Item Measurement Item/Range (Display) Normal Condition Diagnostic Note
    SPEED METER Vehicle speed/Min.: 0 km/h (0 mph), Max.: 255 km/h (158 mph) Almost same as actual speed (When driving) -

    OK: 

    Vehicle speed displayed on the tester is almost the same as the actual vehicle speed measured using a speedometer tester (calibrated chassis dynamometer). 

    NG : Go to step 3 

    OK : REPLACE COMBINATION METER ASSEMBLY 

  3. READ VALUE OF INTELLIGENT TESTER 
    1. Connect the intelligent tester to the DLC3.
    2. Engine switch on (IG).
    3. Turn the tester ON.
    4. Enter the following menus: DIAGNOSIS OBD/MOBD / ABS/VSC/TRAC / DATA LIST.
    5. Check the values by referring to the table below.

    ABS/VSC/TRAC: 

    ABS/VSC/TRAC DISPLAY DIAGNOSTIC REFERENCE

    Item Measurement Item/Range (Display) Normal Condition Diagnostic Note
    (FL/FR/RL/RR) WHEEL SPD Vehicle speed/Min.: 0 km/h (0 mph), Max.: 326 km/h (202 mph) Almost same as actual speed (When driving) -

    OK: 

    Vehicle speed displayed on the tester is almost the same as the actual vehicle speed. 

    NG : GO TO BRAKE CONTROL SYSTEM 

    OK : Go To Next Step 

  4. INSPECT COMBINATION METER ASSEMBLY 
    1. Disconnect the A14 (*1)/J77 (*2) connector.
    2. Measure the voltage according to the value(s) in the table below.

    Standard voltage 

    STANDARD VOLTAGE SPECIFICATION

    Tester Connection Condition Specified Condition
    A14-12 (SP1) ((1)) - Body ground Engine switch on (IG) 10 to 14 V
    J77-9 (SP1) ((2)) - Body ground Engine switch on (IG) 10 to 14 V
    (1) without VDIM
    (2) with VDIM

    Result: 

    RESULT REFERENCE

    Result Proceed to
    OK A
    NG (without VDIM) B
    NG (with VDIM) C
    Fig 2: Identifying A14 And J77 Connector Terminals
    G04050016Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    B : Go to step  6

    C : Go to step  7

    A : Go To Next Step 

  5. INSPECT COMBINATION METER ASSEMBLY 
    1. Check the input signal waveform.
      1. Remove the combination meter assembly with connector(s) still connected.
      2. Connect the oscilloscope to the terminals J34-17 (SI) and body ground.
      3. Engine switch on (IG).
      4. Turn the wheel slowly.
      5. Check the signal waveform according to the condition(s) in the table below.
    ITEM CONDITION REFERENCE CHART

    Item Condition
    Tool setting 5 V/DIV., 20 ms./DIV.
    Vehicle condition Driving at approx. 20 km/h (12 mph)

    OK: 

    The waveform is displayed as shown in the illustration. 

    HINT:

    As the vehicle speed increases, the cycle of the signal waveform narrows.

    Result 

    RESULT REFERENCE

    Result Proceed to
    OK A
    NG (for 4GR-FSE) B
    NG (for 2GR-FSE) C
    Fig 3: Connecting Oscilloscope To Terminals J34-17 (SI) And Body Ground
    G04050017Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    B : REPLACE ABS & TRACTION ACTUATOR ASSEMBLY 

    C : REPLACE SKID CONTROL ECU 

    A : REPLACE COMBINATION METER ASSEMBLY 

  6. CHECK HARNESS AND CONNECTOR (COMBINATION METER - ABS & TRACTION ACTUATOR ASSEMBLY) 
    1. Disconnect the J34 and A14 connectors.
    2. Measure the resistance according to the value(s) in the table below.

    Standard resistance 

    STANDARD RESISTANCE SPECIFICATION

    Tester Connection Condition Specified Condition
    A14-12 (SP1) - J34-17 (SI) Always Below 1 Ω
    A14-12 (SP1) - Body ground Always 10 kΩ or higher
    Fig 4: Identifying J34 And A14 Connectors Terminals
    G04050018Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG : REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK : REPLACE COMBINATION METER ASSEMBLY 

  7. CHECK HARNESS AND CONNECTOR (COMBINATION METER - SKID CONTROL ECU) 
    1. Disconnect the J77 and J34 connectors.
    2. Measure the resistance according to the value(s) in the table below.

    Standard resistance 

    STANDARD RESISTANCE SPECIFICATION

    Tester Connection Condition Specified Condition
    J77-9 (SP1) - J34-17 (SI) Always Below 1 Ω
    J77-9 (SP1) - Body ground Always 10 kΩ or higher
    Fig 5: Identifying J77 And J34 Connectors Terminals
    G04050019Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG : REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK : REPLACE COMBINATION METER ASSEMBLY 

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