Meter / Gauge System Speedometer 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 SPEEDOMETER SENSOR (OUTPUT SIGNAL)

CHECK HARNESS AND CONNECTOR (SPEEDOMETER SENSOR - COMBINATION METER ASSEMBLY AND BODY GROUND)

METER / GAUGE SYSTEM - Speedometer Malfunction


DESCRIPTION

The combination meter receives vehicle speed signals from the speedometer sensor via the direct line.

WIRING DIAGRAM


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


INSPECTION PROCEDURE

1.CHECK SPEEDOMETER SENSOR (OUTPUT SIGNAL)
Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25.Meter Gauge Display.Meter / Gauge System.Meter / Gauge System Speedometer Malfunction

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

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

    Measurement Condition
    Item
    		Content
    Tester Connection
    		G19-5 (SI) - Body ground
    Tool Setting
    		5 V/DIV., 20 msec./DIV.
    Condition
    		Driving at approx. 20 km/h (12 mph)
    HINT:
    As the vehicle speed increases, the wavelength shortens.
    OK:
    The waveform displayed is as shown in the illustration.
Text in Illustration
*a
Component with harness connected
(Combination Meter Assembly)


NG
Go to step 2
OK

REPLACE COMBINATION METER ASSEMBLY (HILUX_TGN26 RM000000THS01QX.html)

2.CHECK HARNESS AND CONNECTOR (SPEEDOMETER SENSOR - COMBINATION METER ASSEMBLY AND BODY GROUND)

  1. Disconnect the C38 speedometer sensor 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
    G19-5 (SI) - C38-3 (SI)
    		Always
    		Below 1 Ω
    G19-31 (MS5) - C38-1 (IG+)
    		Always
    		Below 1 Ω
    C38-1 (IG+) - C38-2 (SE)
    		Always
    		10 kΩ or higher
    C38-1 (IG+) - C38-3 (SI)
    		Always
    		10 kΩ or higher
    C38-2 (SE) - C38-3 (SI)
    		Always
    		10 kΩ or higher
    C38-2 (SE) - Body ground
    		Always
    		Below 1 Ω
    Result
    Result
    		Proceed to
    NG
    		A
    OK (for VF2A)
    		B
    OK (for A343E)
    		C
    OK (for R150, R151)
    		D


B
REPLACE SPEEDOMETER SENSOR (HILUX_TGN26 RM000004RUD004X.html)

C
REPLACE SPEEDOMETER SENSOR

D
REPLACE SPEEDOMETER SENSOR (HILUX_TGN26 RM000004REM004X.html)
A

REPAIR OR REPLACE HARNESS OR CONNECTOR