Last Modified: 4-30-2014 6.6 C Doc ID: RM0000012TD005X
Model Year: 2006 Model: LX470 Prod Date Range: [05/2005 -           ]
Title: A750F AUTOMATIC TRANSMISSION: AUTOMATIC TRANSMISSION SYSTEM: P0722; Output Speed Sensor Circuit No Signal; 2006 MY LX470 [05/2005 -        ]

DTC

P0722

Output Speed Sensor Circuit No Signal

DESCRIPTION

The speed sensor SP2 detects the rotation speed of the transmission output shaft and sends signals to the ECM. The ECM determines the vehicle speed based on these signals. AC voltage is generated in the speed sensor SP2 coil as the parking gear mounted on the rear planetary gear assembly rotates, and this voltage is sent to the ECM. The parking gear on the rear planetary gear is used as the timing rotor for this sensor. The gear shift point and lock-up timing are controlled by the ECM based on the signals from this vehicle speed sensor and the throttle position sensor signal.

DTC No.

DTC Detection Condition

Trouble Area

P0722
  • All conditions below are detected 500 times or more continuously

    (1 trip detection logic):

    1. No signal from speed sensor SP2 is input to ECM while 4 pulses of No. 1 vehicle speed sensor signal are sent
    2. Vehicle speed is 9 km/h (5.6 mph) or more for at least 4 sec.
    3. PNP switch is OFF
    4. Transfer position is not neutral (4WD)
  • Open or short in speed sensor SP2 circuit
  • Speed sensor SP2
  • ECM
  • Automatic transmission (clutch, brake or gear, etc.)

1. Reference: Inspect using an oscilloscope.

Check the waveform of the ECM connector.

Standard voltage:

Refer to illustration.

Item

Content

Tester Connection

E7-34 (SP2+) - E7-26 (SP2-)

Tool Setting

2 V/DIV, 2 msec./DIV

Condition

Vehicle speed 20 km/h (12 mph)

MONITOR DESCRIPTION

The output speed sensor SP2 monitors the output shaft speed. The ECM controls the gear shift point and the lock-up timing based on the signals from the output speed sensor SP2 and throttle position sensor.

If the ECM detects no signal from the output shaft speed sensor SP2 even while the vehicle is moving, the ECM will conclude that the output shaft speed sensor SP2 is malfunctioning. The ECM will illuminate the MIL and set the DTC.

MONITOR STRATEGY

Related DTCs

P0722: Speed sensor SP2/Verify pulse input

Required sensors/Components

Speed sensor SP2

Frequency of operation

Continuous

Duration

500 output shaft revolution

MIL operation

Immediate

Sequence of operation

None

TYPICAL ENABLING CONDITIONS

The monitor will run whenever the following DTCs are not present.

P500: VSS

P0748: Trans Solenoid (range)

Vehicle speed range (4 sec. or more)

9 km/h (5.6 mph) or more

NSW switch

OFF

Transfer neutral switch

OFF

TYPICAL MALFUNCTION THRESHOLDS

No output speed sensor pulse input during 4 vehicle speed sensor pulse input

500 times or more

WIRING DIAGRAM

INSPECTION PROCEDURE

HINT:

Using the intelligent tester's DATA LIST allows switch, sensor, actuator and other item values to be read without removing any parts. Reading the DATA LIST early in troubleshooting is one way to save time.

NOTICE:

In the table below, the values listed under "Normal Condition" are reference values. Do not depend solely on these reference values when deciding whether a part is faulty or not.

  1. Warm up the engine.
  2. Turn the ignition switch OFF.
  3. Connect the intelligent tester to the CAN VIM. Then connect the CAN VIM to the DLC3.
  4. Turn the ignition switch ON.
  5. Turn the intelligent tester ON.
  6. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / DATA LIST.
  7. Follow the instructions on the tester and read the DATA LIST.

Item

Measurement Item/

Range (Display)

Normal Condition

Diagnostic Note

SPD (SP2)

Output shaft speed/

Min.: 0 km/h (0 mph)

Max.: 255 km/h (158 mph)

Vehicle stopped: 0 km/h (0 mph)

(output shaft speed is equal to vehicle speed)

-

HINT:

  • SPD (SP2) is always 0 while driving:

    Open or short in the sensor or circuit.

  • SPD (SP2) value displayed on the tester is much lower than the actual vehicle speed:

    Sensor trouble, improper installation, or intermittent connection trouble of the circuit.

PROCEDURE

1.

INSPECT SPEED SENSOR INSTALLATION

(a) Check the speed sensor SP2 installation.

OK:

Installation bolt is tightened properly and there is no clearance between the sensor and transmission case.
NG

SECURELY INSTALL SENSOR OR REPLACE SENSOR

OK

2.

INSPECT SPEED SENSOR SP2

(a) Disconnect the V3 sensor connector from the transmission.

(b) Measure the resistance of the sensor.

Standard resistance:

Tester Connection

Condition

Specified Condition

1 - 2

20°C (68°F)

560 to 680 Ω
NG

REPLACE SPEED SENSOR SP2

OK

3.

CHECK WIRE HARNESS (SPEED SENSOR - ECM)

(a) Check wire harness 2006 MY LX470 [05/2005 -        ]; INTRODUCTION: HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS: ELECTRONIC CIRCUIT INSPECTION PROCEDURE .

NG

REPAIR OR REPLACE HARNESS AND CONNECTOR

OK

REPLACE ECM