Meter / Gauge System Tachometer Malfunction

Vehicle Interior. Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25
Meter Gauge Display. Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK COMBINATION METER ASSEMBLY

CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - ECM)

CHECK ENGINE TYPE

CHECK ENGINE TYPE

CHECK ENGINE TYPE

METER / GAUGE SYSTEM - Tachometer Malfunction


DESCRIPTION

In this circuit, the combination meter assembly receives engine speed signals from the ECM. The meter CPU displays the engine speed, which is calculated based on the data received from the ECM.

WIRING DIAGRAM


Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25.Meter Gauge Display.Meter / Gauge System.Meter / Gauge System Tachometer Malfunction


INSPECTION PROCEDURE

1.CHECK COMBINATION METER ASSEMBLY
Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25.Meter Gauge Display.Meter / Gauge System.Meter / Gauge System Tachometer Malfunction

  1. Disconnect the G19 combination meter assembly connector.

  1. Using an oscilloscope, check the signal waveform of the meter.

    Item
    		Condition
    Tester Connection
    		G19-7 (S) - Body ground
    Tool Setting
    		5 V/DIV., 10 msec./DIV.
    Condition
    		Engine idling
    HINT:
    As the engine speed increases, the wavelength shortens.
    OK:
    The waveform displayed is as shown in the illustration.
    Text in Illustration
    *a
    		Front view of wire harness connector
    (to Combination Meter Assembly)


NG
Go to step 2
OK

CHECK ENGINE TYPE

Go to step 4

2.CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - ECM)

  1. Disconnect the G19 combination meter assembly connector.

  1. Disconnect the G88*1, G146*2 or G39*3 ECM connector.

    1. *1: for 2TR-FE
    2. *2: for 2TR-FBE
    3. *3: for 1KD-FTV, 2KD-FTV

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    for 2TR-FE
    Tester Connection
    		Condition
    		Specified Condition
    G19-7 (S) - G88-1 (TACH)
    		Always
    		Below 1 Ω
    G19-7 (S) or G88-1 (TACH) - Body ground
    		Always
    		10 kΩ or higher
    for 2TR-FBE
    Tester Connection
    		Condition
    		Specified Condition
    G19-7 (S) - G146-29 (TACH)
    		Always
    		Below 1 Ω
    G19-7 (S) or G146-29 (TACH) - Body ground
    		Always
    		10 kΩ or higher
    for 1KD-FTV, 2KD-FTV
    Tester Connection
    		Condition
    		Specified Condition
    G19-7 (S) - G39-4 (TACH)
    		Always
    		Below 1 Ω
    G19-7 (S) or G39-4 (TACH) - Body ground
    		Always
    		10 kΩ or higher
    Result
    Result
    		Proceed to
    OK (for 2TR-FE, 2TR-FBE)
    		A
    OK (for 1KD-FTV)
    		B
    OK (for 2KD-FTV)
    		C
    NG
    		D


B
Go to step 4

C
Go to step 5

D
REPAIR OR REPLACE HARNESS AND CONNECTOR
A


3.CHECK ENGINE TYPE

  1. Check the engine type.

    Result
    Result
    		Proceed to
    for 2TR-FE, w/ Secondary Air Injection System
    		A
    for 2TR-FE, w/o Secondary Air Injection System
    		B
    for 2TR-FBE
    		C


B
GO TO SFI SYSTEM (HILUX_TGN26 RM000000PD90R5X.html)

C
GO TO SFI SYSTEM (HILUX_TGN26 RM000000PD90QFX.html)
A

GO TO SFI SYSTEM (HILUX_TGN26 RM000000PD90Q5X.html)

4.CHECK ENGINE TYPE

  1. Check the engine type.

    Result
    Result
    		Proceed to
    for 1KD-FTV, w/ EGR Cooler
    		A
    for 1KD-FTV, w/o EGR Cooler
    		B


B
GO TO ECD SYSTEM (HILUX_TGN26 RM0000012WB03FX.html)
A

GO TO ECD SYSTEM (HILUX_TGN26 RM0000012WB03DX.html)

5.CHECK ENGINE TYPE

  1. Check the engine type.

    Result
    Result
    		Proceed to
    for 2KD-FTV, w/ EGR Cooler
    		A
    for 2KD-FTV, w/o EGR Cooler
    		B


B
GO TO ECD SYSTEM (HILUX_TGN26 RM0000012WB03CX.html)
A

GO TO ECD SYSTEM (HILUX_TGN26 RM0000012WB03GX.html)