Dtc 15 (4) Throttle Motor Circuit Malfunction


DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

INSPECT THROTTLE OPEN SWITCH

CHECK HARNESS AND CONNECTOR (THROTTLE OPEN SWITCH - ECM AND BODY GROUND)

CHECK ECM (THROTTLE CONTROL MOTOR CIRCUIT)

INSPECT THROTTLE CONTROL MOTOR

CHECK HARNESS AND CONNECTOR (THROTTLE CONTROL MOTOR - ECM)

DTC 15 (4) Throttle Motor Circuit Malfunction


DESCRIPTION

The throttle control motor is operated by the ECM and it opens and closes the throttle valve.
The fully open position of the throttle valve is detected by the throttle open switch mounted on the venturi.
If this DTC is stored, the ECM shuts down the power for the throttle control motor.

DTC No.
DTC Detection Condition
Trouble Area
15 (4)
Open or short in throttle control motor circuit
  1. Open or short in throttle control motor circuit
  2. Throttle control motor
  3. Throttle valve
  4. Open or short in throttle open switch circuit
  5. Throttle open switch
  6. ECM
Open or short in throttle open switch circuit

WIRING DIAGRAM


Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.5L-E Engine Control System.Ecd System. Dtc 15 (4) Throttle Motor Circuit Malfunction


INSPECTION PROCEDURE

HINT:
Read freeze frame data using the intelligent tester. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air-fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.
1.INSPECT THROTTLE OPEN SWITCH


    Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50

  1. Disconnect the T32 throttle open switch connector.

  1. Remove the venturi.

  1. Measure the resistance of the throttle open switch.

    Standard resistance:
    Tester Connection
    		Throttle Valve Condition
    		Specified Condition
    1 - 2
    		Open
    		Below 1 Ω
    1 - 2
    		Closed
    		10 kΩ or higher
    HINT:
    The throttle open switch is integrated with the venturi. If the throttle open switch needs to be replaced, the entire venturi must be replaced.


NG
REPLACE VENTURI
OK


2.CHECK HARNESS AND CONNECTOR (THROTTLE OPEN SWITCH - ECM AND BODY GROUND)


    Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.5L-E Engine Control System.Ecd System. Dtc 15 (4) Throttle Motor Circuit Malfunction

  1. Disconnect the T32 throttle open switch connector.

  1. Disconnect the E21 ECM connector.

  1. Measure the resistance of the wire harness side connectors.

    Standard resistance:
    Tester Connection
    		Specified Condition
    T32-1 - Body ground
    		Below 1 Ω
    E21-15 (THOP) - T32-2
    		Below 1 Ω
    E21-15 (THOP) or T32-2 - Body ground
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


3.CHECK ECM (THROTTLE CONTROL MOTOR CIRCUIT)


    Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.5L-E Engine Control System.Ecd System. Dtc 15 (4) Throttle Motor Circuit Malfunction

  1. During engine racing, measure the waveform according to the value(s) in the table below.

    OK:
    Tester Connection
    		Specified Condition
    E20-10 (LU+A) - E20-13 (E01)
    		Correct waveform is as shown
    E20-9 (LU-A) - E20-13 (E01)
    		Correct waveform is as shown
    E20-8 (LU+B) - E20-13 (E01)
    		Correct waveform is as shown
    E20-7 (LU-B) - E20-13 (E01)
    		Correct waveform is as shown
    Tool Setting
    		Condition
    10 V/DIV., 0.5 msec./DIV.
    		During engine racing


OK
REPLACE ECM
NG


4.INSPECT THROTTLE CONTROL MOTOR


    Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.5L-E Engine Control System.Ecd System. Dtc 15 (4) Throttle Motor Circuit Malfunction

  1. Disconnect the T31 throttle control motor connector.

  1. Measure the resistance of the throttle control motor.

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    1 - 2
    		20°C (68°F)
    		18 to 22 Ω
    2 - 3
    		20°C (68°F)
    		18 to 22 Ω
    4 - 5
    		20°C (68°F)
    		18 to 22 Ω
    5 - 6
    		20°C (68°F)
    		18 to 22 Ω
    HINT:
    The throttle control motor is integrated with the venturi. If the throttle control motor needs to be replaced, the entire venturi must be replaced.


NG
REPLACE VENTURI
OK


5.CHECK HARNESS AND CONNECTOR (THROTTLE CONTROL MOTOR - ECM)


    Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.5L-E Engine Control System.Ecd System. Dtc 15 (4) Throttle Motor Circuit Malfunction

  1. Disconnect the T31 throttle control motor connector.

  1. Disconnect the E20 ECM connector.

  1. Measure the resistance of the wire harness side connectors.

    Standard resistance:
    Tester Connection
    		Specified Condition
    T31-6 - E20-10 (LU+A)
    		Below 1 Ω
    T31-4 - E20-9 (LU-A)
    		Below 1 Ω
    T31-3 - E20-8 (LU+B)
    		Below 1 Ω
    T31-1 - E20-7 (LU-B)
    		Below 1 Ω
    E20-10 (LU+A) - E20-13 (E01)
    		10 kΩ or higher
    E20-9 (LU-A) - E20-13 (E01)
    		10 kΩ or higher
    E20-8 (LU+B) - E20-13 (E01)
    		10 kΩ or higher
    E20-7 (LU-B) - E20-13 (E01)
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

CHECK ECM POWER SOURCE CIRCUIT