Dtc P1222 Throttle Motor Circuit Range/Performance


DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

INSPECT THROTTLE OPEN SWITCH

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

CHECK TERMINAL VOLTAGE (THROTTLE CONTROL MOTOR)

INSPECT THROTTLE CONTROL MOTOR

CHECK HARNESS AND CONNECTOR (THROTTLE CONTROL MOTOR - ECM)

DTC P1222 Throttle Motor Circuit Range/Performance


DESCRIPTION

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

DTC No.
DTC Detection Condition
Trouble Area
P1222
Open or short in throttle control motor circuit.
  1. Open or short in throttle control motor circuit
  2. Throttle control motor (Venturi assembly)
  3. Intake restrictor valve
  4. Open or short in throttle open switch circuit
  5. Throttle open switch (Venturi assembly)
  6. ECM
Open or short in throttle open switch circuit.

WIRING DIAGRAM


Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.5L-E Engine Control.Ecd System. Dtc P1222 Throttle Motor Circuit Range/Performance


INSPECTION PROCEDURE

NOTICE:
Inspect the fuses for circuits related to this system before performing the following inspection procedure.
HINT:
Read freeze frame data using the GTS. Freeze frame data records the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, and other data from the time the malfunction occurred.
1.INSPECT THROTTLE OPEN SWITCH


    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.5L-E Engine Control.Ecd System. Dtc P1222 Throttle Motor Circuit Range/Performance

  1. Disconnect the throttle open switch connector.

  1. Remove the venturi assembly.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    1 - 2
    		Throttle valve is opened
    		Below 1 Ω
    1 - 2
    		Throttle valve is closed
    		10 kΩ or higher
    Text in Illustration
    *a
    		Component without harness connected
    (Throttle Open Switch)
    HINT:
    The throttle open switch is integrated with the venturi assembly. If the throttle open switch is replaced, the venturi assembly must be replaced in whole.


NG
REPLACE VENTURI ASSEMBLY
OK


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

  1. Disconnect the throttle open switch connector.

  1. Disconnect the ECM connector.

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

    Standard Resistance:

    Tester Connection
    		Condition
    		Specified Condition
    C163-2 - C162-15 (THOP)
    		Always
    		Below 1 Ω
    C163-1 - Body ground
    		Always
    		Below 1 Ω
    C163-2 or C162-15 (THOP) - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


3.CHECK TERMINAL VOLTAGE (THROTTLE CONTROL MOTOR)


    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.5L-E Engine Control.Ecd System. Dtc P1222 Throttle Motor Circuit Range/Performance

  1. Disconnect the throttle control motor connector.

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    C105-2 (+B1) - Body ground
    		Ignition switch ON
    		11 to 14 V
    C105-5 (+B2) - Body ground
    		Ignition switch ON
    		11 to 14 V
    Text in Illustration
    *a
    		Front view of wire harness connector
    (to Throttle Control Motor)


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (THROTTLE CONTROL MOTOR - NO. 1 INTEGRATION RELAY)
OK


4.INSPECT THROTTLE CONTROL MOTOR


    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.5L-E Engine Control.Ecd System. Dtc P1222 Throttle Motor Circuit Range/Performance

  1. Disconnect the throttle control motor connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    1 (LU-B) - 2 (+B1)
    		20°C (68°F)
    		18 to 22 Ω
    2 (+B1) - 3 (LU+B)
    		20°C (68°F)
    		18 to 22 Ω
    4 (LU-A) - 5 (+B2)
    		20°C (68°F)
    		18 to 22 Ω
    5 (+B2) - 6 (LU+A)
    		20°C (68°F)
    		18 to 22 Ω
    Text in Illustration
    *a
    		Component without harness connected
    (Throttle Control Motor)
    HINT:
    The throttle control motor is integrated with the venturi assembly. If the throttle control motor is replaced, the venturi assembly must be replaced in whole.


NG
REPLACE VENTURI ASSEMBLY
OK


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

  1. Disconnect the throttle control motor connector.

  1. Disconnect the ECM connector.

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

    Standard Resistance:

    Tester Connection
    		Condition
    		Specified Condition
    C105-6 (LU+A) - C161-17 (LU+A)
    		Always
    		Below 1 Ω
    C105-4 (LU-A) - C161-16 (LU-A)
    		Always
    		Below 1 Ω
    C105-3 (LU+B) - C161-15 (LU+B)
    		Always
    		Below 1 Ω
    C105-1 (LU-B) - C161-14 (LU-B)
    		Always
    		Below 1 Ω
    C105-6 (LU+A) or C161-17 (LU+A) - Body ground
    		Always
    		10 kΩ or higher
    C105-4 (LU-A) or C161-16 (LU-A) - Body ground
    		Always
    		10 kΩ or higher
    C105-3 (LU+B) or C161-15 (LU+B) - Body ground
    		Always
    		10 kΩ or higher
    C105-1 (LU-B) or C161-14 (LU-B) - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE ECM (LandCruiser RM000000VW203FX.html)