Meter / Gauge System Speed Signal Circuit

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 HARNESS AND CONNECTOR (DRIVER SIDE JUNCTION BLOCK ASSEMBLY)

SYSTEM CHECK

CHECK HARNESS AND CONNECTOR (DRIVER SIDE JUNCTION BLOCK ASSEMBLY - RADIO RECEIVER OR RADIO AND DISPLAY RECEIVER)

CHECK HARNESS AND CONNECTOR (DRIVER SIDE JUNCTION BLOCK ASSEMBLY - TCM)

CHECK HARNESS AND CONNECTOR (DRIVER SIDE JUNCTION BLOCK ASSEMBLY - THEFT WARNING ECU ASSEMBLY)

CHECK HARNESS AND CONNECTOR (DRIVER SIDE JUNCTION BLOCK ASSEMBLY - AIR CONDITIONING AMPLIFIER ASSEMBLY)

CHECK HARNESS AND CONNECTOR (DRIVER SIDE JUNCTION BLOCK ASSEMBLY - ECM)

CHECK HARNESS AND CONNECTOR (DRIVER SIDE JUNCTION BLOCK ASSEMBLY - COMBINATION METER ASSEMBLY)

CHECK COMBINATION METER ASSEMBLY

METER / GAUGE SYSTEM - Speed Signal Circuit


DESCRIPTION

The vehicle speed signal consists of pulses sent to the combination meter assembly from the speedometer sensor.
NOTICE:
If the speedometer operation is not normal, refer to "Speedometer Malfunction" (HILUX_TGN26 RM0000011IY019X.html).

WIRING DIAGRAM


Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25.Meter Gauge Display.Meter / Gauge System.Meter / Gauge System Speed Signal Circuit


INSPECTION PROCEDURE

1.CHECK HARNESS AND CONNECTOR (DRIVER SIDE JUNCTION BLOCK ASSEMBLY)


    Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25.Meter Gauge Display.Meter / Gauge System.Meter / Gauge System Speed Signal Circuit

  1. Disconnect the 2Q driver side junction block assembly connector.

  1. Disconnect the 2P driver side junction block assembly connector.

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

    HINT:
    If the voltage is not as specified, it is possible that an ECU or circuit has a malfunction. The malfunctioning ECU or circuit will be diagnosed in the following steps.
    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    2Q-4 - Body ground*1, *2
    		Ignition switch ON
    		4.5 to 14 V
    2Q-10 - Body ground*3, *4
    		Ignition switch ON
    		4.5 to 14 V
    2P-4 - Body ground*5
    		Ignition switch ON
    		4.5 to 14 V
    2P-10 - Body ground*6
    		Ignition switch ON
    		4.5 to 14 V
    2P-26 - Body ground
    		Ignition switch ON
    		4.5 to 14 V
    1. *1: for Radio Receiver Type
    2. *2: for Radio and Display Type
    3. *3: for 1KD-FTV
    4. *4: for Automatic Transmission
    5. *5: w/ Theft Deterrent System
    6. *6: w/ Automatic Air Conditioning System
    Text in Illustration
    *a
    		Front view of wire harness connector
    (to Junction Connector)
    Result
    Result
    		Proceed to
    Voltage is not as specified in one circuit
    		A
    Voltage is as specified in all circuits
    		B


B
Go to step 8
A


2.SYSTEM CHECK

  1. Select the circuit for which the voltage was not as specified in the previous step.

    Result
    Tester Connection
    		System that Uses the Circuit
    		Proceed to
    2Q-4 - Body ground*1, *2
    		Audio and visual system
    		A
    2Q-10 - Body ground*3, *4
    		Automatic transmission system
    		B
    2P-4 - Body ground*5
    		Theft deterrent system
    		C
    2P-10 - Body ground*6
    		Automatic air conditioning system
    		D
    2P-26 - Body ground
    		SFI system*7 or ECD system*3, *8
    		E
    1. *1: for Radio Receiver Type
    2. *2: for Radio and Display Type
    3. *3: for 1KD-FTV
    4. *4: for Automatic Transmission
    5. *5: w/ Theft Deterrent System
    6. *6: w/ Automatic Air Conditioning System
    7. *7: for 2TR-FE, 2TR-FBE
    8. *8: for 1KD-FTV, 2KD-FTV


B
Go to step 4

C
Go to step 5

D
Go to step 6

E
Go to step 7
A


3.CHECK HARNESS AND CONNECTOR (DRIVER SIDE JUNCTION BLOCK ASSEMBLY - RADIO RECEIVER OR RADIO AND DISPLAY RECEIVER)

  1. Disconnect the 2Q driver side junction block assembly connector.

  1. Disconnect the G1 radio receiver assembly*1 or G127 radio and display receiver assembly*2 connector.

    1. *1: for Radio Receiver Type
    2. *2: for Radio and Display Type

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    2Q-4 - G1-17 (SPD)*1
    		Always
    		Below 1 Ω
    2Q-4 - G127-17 (SPD)*2
    		Always
    		Below 1 Ω
    G1-17 (SPD) - Body ground*1
    		Always
    		10 kΩ or higher
    G127-17 (SPD) - Body ground*2
    		Always
    		10 kΩ or higher
    Result
    Result
    		Proceed to
    NG
    		A
    OK (for Radio Receiver Type)
    		B
    OK (for Radio and Display Type)
    		C


B
REPLACE RADIO RECEIVER ASSEMBLY (HILUX_TGN26 RM000003OG900GX.html)

C
REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY (HILUX_TGN26 RM000003OG900GX.html)
A

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.CHECK HARNESS AND CONNECTOR (DRIVER SIDE JUNCTION BLOCK ASSEMBLY - TCM)

  1. Disconnect the 2Q driver side junction block assembly connector.

  1. Disconnect the G41 TCM connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    2Q-10 - G41-25 (SPD1)
    		Always
    		Below 1 Ω
    G41-25 (SPD1) - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE TCM (HILUX_TGN26 RM000004ROZ00CX.html)

5.CHECK HARNESS AND CONNECTOR (DRIVER SIDE JUNCTION BLOCK ASSEMBLY - THEFT WARNING ECU ASSEMBLY)

  1. Disconnect the 2P driver side junction block assembly connector.

  1. Disconnect the G29 theft warning ECU assembly connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    2P-4 - G29-17 (SPD)
    		Always
    		Below 1 Ω
    G29-17 (SPD) - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE THEFT WARNING ECU ASSEMBLY (HILUX_TGN26 RM000004QXI007X.html)

6.CHECK HARNESS AND CONNECTOR (DRIVER SIDE JUNCTION BLOCK ASSEMBLY - AIR CONDITIONING AMPLIFIER ASSEMBLY)

  1. Disconnect the 2P driver side junction block assembly connector.

  1. Disconnect the G94 air conditioning amplifier assembly connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    2P-10 - G94-9 (SPD)
    		Always
    		Below 1 Ω
    G94-9 (SPD) - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY (HILUX_TGN26 RM000001K3A014X.html)

7.CHECK HARNESS AND CONNECTOR (DRIVER SIDE JUNCTION BLOCK ASSEMBLY - ECM)

  1. Disconnect the 2P driver side junction block assembly connector.

  1. Disconnect the G38*1 or G88*2 or G146*3 ECM connector.

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

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

    Standard Resistance:
    for 1KD-FTV, 2KD-FTV
    Tester Connection
    		Condition
    		Specified Condition
    2P-26 - G38-17 (SPD)
    		Always
    		Below 1 Ω
    G38-17 (SPD) - Body ground
    		Always
    		10 kΩ or higher
    for 2TR-FE
    Tester Connection
    		Condition
    		Specified Condition
    2P-26 - G88-8 (SPD)
    		Always
    		Below 1 Ω
    G88-8 (SPD) - Body ground
    		Always
    		10 kΩ or higher
    for 2TR-FBE
    Tester Connection
    		Condition
    		Specified Condition
    2P-26 - G146-16 (SPD)
    		Always
    		Below 1 Ω
    G146-16 (SPD) - Body ground
    		Always
    		10 kΩ or higher
    Result
    Result
    		Proceed to
    NG
    		A
    OK (for 1KD-FTV)
    		B
    OK (for 2KD-FTV)
    		C
    OK (for 2TR-FE)
    		D
    OK (for 2TR-FBE)
    		E


B
REPLACE ECM (HILUX_TGN26 RM0000013Z0019X.html)

C
REPLACE ECM (HILUX_TGN26 RM0000043H100GX.html)

D
REPLACE ECM (HILUX_TGN26 RM000000VW2023X.html)

E
REPLACE ECM (HILUX_TGN26 RM000000VW2024X.html)
A

REPAIR OR REPLACE HARNESS OR CONNECTOR

8.CHECK HARNESS AND CONNECTOR (DRIVER SIDE JUNCTION BLOCK ASSEMBLY - COMBINATION METER ASSEMBLY)

  1. Disconnect the 2Q driver side junction block assembly connector.

  1. Disconnect the G19 combination meter assembly connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    2Q-26 - G19-6 (+S)
    		Always
    		Below 1 Ω
    G19-6 (+S) - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


9.CHECK COMBINATION METER ASSEMBLY


  1. Check the output waveform.



      Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25.Meter Gauge Display.Meter / Gauge System.Meter / Gauge System Speed Signal Circuit

    1. Reconnect the G19 combination meter assembly connector.

    2. Remove the combination meter assembly with the connector(s) still connected.

    3. Connect an oscilloscope to terminal G19-6 (+S) and body ground.

    4. Turn the ignition switch to ON.

    5. Check the signal waveform according to the condition(s) in the table below.

      Measurement Condition
      Item
      		Condition
      Tester Connection
      		G19-6 (+S) - Body ground
      Tool Setting
      		5 V/DIV., 20 msec./DIV.
      Condition
      		Driving at approx. 20 km/h (12 mph)
      Text in Illustration
      *a
      		Component with harness connected
      (Combination Meter Assembly)


NG
REPLACE COMBINATION METER ASSEMBLY (HILUX_TGN26 RM000000THS01QX.html)
OK

REPLACE DRIVER SIDE JUNCTION BLOCK ASSEMBLY