Meter / Gauge System Tachometer Malfunction


DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK COMBINATION METER ASSEMBLY

CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - ECM)

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


Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.Meter.Meter / Gauge System.Meter / Gauge System Tachometer Malfunction


INSPECTION PROCEDURE

1.CHECK COMBINATION METER ASSEMBLY
Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.Meter.Meter / Gauge System.Meter / Gauge System Tachometer Malfunction

  1. Disconnect the C27 combination meter assembly connector.

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

    Item
    		Condition
    Tester Connection
    		C27-7 (S) - Body ground
    Tool Setting
    		5 V/DIV., 10 msec./DIV.
    Condition
    		Engine idling
    OK:
    The waveform displayed is as shown in the illustration.
    Text in Illustration
    *a
    		Front view of wire harness connector
    (to Combination Meter Assembly)
    HINT:
    As the engine speed increases, the wavelength shortens.


NG
Go to step 2
OK

REPLACE COMBINATION METER ASSEMBLY (Toyota Fortuner RM000000THS01WX.html)

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

  1. Disconnect the C27 combination meter assembly connector.

  1. Disconnect the E9*1 or E4*2 or E13*3 or E22*4 ECM connector.
    *1: for 2TR-FE
    *2: for 1KD-FTV, 2KD-FTV
    *3: for 1GR-FE
    *4: for 5L-E

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

    Standard Resistance:
    for 2TR-FE
    Tester Connection
    		Condition
    		Specified Condition
    C27-7 (S) - E9-1 (TACH)
    		Always
    		Below 1 Ω
    C27-7 or E9-1 (TACH) - Body ground
    		Always
    		10 kΩ or higher
    for 1KD-FTV, 2KD-FTV
    Tester Connection
    		Condition
    		Specified Condition
    C27-7 (S) - E4-4 (TACH)
    		Always
    		Below 1 Ω
    C27-7 (S) or E4-4 (TACH) - Body ground
    		Always
    		10 kΩ or higher
    for 1GR-FE
    Tester Connection
    		Condition
    		Specified Condition
    C27-7 (S) - E13-1 (TACH)
    		Always
    		Below 1 Ω
    C27-7 or E13-1 (TACH) - Body ground
    		Always
    		10 kΩ or higher
    for 5L-E
    Tester Connection
    		Condition
    		Specified Condition
    C27-7 (S) - E22-7 (TACH)
    		Always
    		Below 1 Ω
    C27-7 or E22-7 (TACH) - Body ground
    		Always
    		10 kΩ or higher
    Result
    Result
    		Proceed to
    NG
    		A
    OK (for 2TR-FE, 1GR-FE)
    		B
    OK (for 1KD-FTV, 2KD-FTV, 5L-E)
    		C


B
GO TO SFI SYSTEM

C
GO TO ECD SYSTEM
A

REPAIR OR REPLACE HARNESS OR CONNECTOR