Toyota 4Runner: Output Speed Sensor Circuit No Signal (P0722)

Toyota 4Runner Service Manual / Drivetrain / A750e Automatic Transmission / Transaxle / Automatic Transmission System / Output Speed Sensor Circuit No Signal (P0722)

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. An 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 Code	DTC Detection Condition	Trouble Area
P0722	All conditions are met 500 times or more continuously (2-trip detection logic): (a) No signal from speed sensor SP2 is input to the ECM while 4 pulses of the No. 1 vehicle speed sensor signal are sent. (b) Vehicle speed is 9 km/h (6 mph) or more for at least 5 sec. (c) Park/neutral position switch is OFF.	Open or short in speed sensor SP2 circuit Speed sensor SP2 ECM Automatic transmission (clutch, brake, gear, etc.)

DTC Code

DTC Detection Condition

Trouble Area

P0722

All conditions are met 500 times or more continuously (2-trip detection logic):

(a) No signal from speed sensor SP2 is input to the ECM while 4 pulses of the No. 1 vehicle speed sensor signal are sent.

(b) Vehicle speed is 9 km/h (6 mph) or more for at least 5 sec.

Open or short in speed sensor SP2 circuit
Speed sensor SP2
ECM
Automatic transmission (clutch, brake, gear, etc.)

Reference: Inspect using an oscilloscope.

Check the waveform of the ECM connector.

Standard:

Terminal No. (Symbol)	Tool Setting	Condition	Specified Condition
B38-9 (SP2+) - B38-10 (SP2-)	2 V/DIV., 20 msec./DIV.	Vehicle speed 20 km/h (12 mph)	Refer to illustration

MONITOR DESCRIPTION

The output speed sensor SP2 monitors the output shaft speed. The ECM controls the gear shift point and 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, it will conclude that there is a malfunction of the output speed sensor SP2. The ECM will illuminate the MIL and store a DTC.

MONITOR STRATEGY

Related DTCs	P0722: Speed sensor SP2/Verify pulse input
Required Sensors/Components	Speed sensor SP2
Frequency of operation	Continuous
Duration	5 sec.
MIL operation	2 driving cycles
Sequence of operation	None

TYPICAL ENABLING CONDITIONS

The monitor will run whenever the following DTCs are not stored	None
Vehicle speed from vehicle speed sensor	9 km/h (5.59 mph) or more
Battery voltage	8 V or higher
Ignition switch	ON
Starter	OFF

TYPICAL MALFUNCTION THRESHOLDS

Speed sensor signal

No signal

COMPONENT OPERATING RANGE

Vehicle speed from output speed sensor

9 km/h (5.59 mph) or more

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Perform the universal trip to clear permanent DTCs (See page ).

1. DATA LIST

HINT:

Using the Techstream to read the Data List allows the values or states of switches, sensors, actuators and other items to be read without removing any parts. This non-intrusive inspection can be very useful because intermittent conditions or signals may be discovered before parts or wiring is disturbed. Reading the Data List information early in troubleshooting is one way to save diagnostic 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.

(a) Warm up the engine.

(b) Turn the ignition switch off.

(d) Turn the ignition switch to ON.

(e) Turn the Techstream on.

(f) Enter the following menus: Powertrain / Engine and ECT / Data List.

(g) According to the display on the Techstream, read the Data List.

Engine and ECT

Tester Display	Measurement Item/Range	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 equal to vehicle speed)	-

Tester Display

Measurement Item/Range

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 equal to vehicle speed)

HINT:

SPD (SP2) is always 0 while driving:
Open or short in the sensor or circuit.
The SPD (SP2) value displayed on the Techstream is much lower than the actual vehicle speed:
Sensor trouble, improper installation or intermittent connection trouble in the circuit.

PROCEDURE

1.	INSPECT SPEED SENSOR SP2 INSTALLATION

(a) Check the speed sensor SP2 installation.

OK:

The installation bolt is tightened properly and there is no clearance between the sensor and transmission case.

Text in Illustration

*a	CORRECT
*b	INCORRECT

SECURELY INSTALL OR REPLACE SPEED SENSOR SP2

2.	INSPECT SPEED SENSOR SP2

(a) Disconnect the B33 speed sensor connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
1 - 2	20°C (68°F)	560 to 680 Ω

Text in Illustration

*a	Component without harness connected (Speed Sensor SP2)

REPLACE SPEED SENSOR SP2

3.	CHECK HARNESS AND CONNECTOR (SPEED SENSOR SP2 - ECM)

(a) Disconnect the B38 ECM connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
B38-9 (SP2+) - B38-10 (SP2-)	20°C (68°F)	560 to 680 Ω
B38-9 (SP2+) - Body ground	Always	10 kΩ or higher
B38-10 (SP2-) - Body ground	Always	10 kΩ or higher

Text in Illustration

*a	Rear view of wire harness connector (to ECM)

REPLACE ECM

REPAIR OR REPLACE HARNESS OR CONNECTOR

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