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DI-1180 DIAGNOSTICS - AUTOMATIC TRANSMISSION (A750E/A750F for
2UZ-FE)
DIDWN-01
DTC P0722 Output Speed Sensor Circuit No Signal
CIRCUIT 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 assy 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.
Clutch Drum
Output Speed Sensor SP2
(Timing Rotor)
(Transmission Revolution Sensor SP2)
Parking Gear
(Timing Rotor)
Input Speed Sensor NT
(Transmission Revolution Sensor NT)
D14162
DTC No. DTC Detection Condition Trouble Area
All conditions below are detected 500 times or more continu-
ously (1-trip detection logic)
(a) No signal from speed sensor (SP2) is input to ECM while 4 S Open or short in speed sensor (SP2) circuit
S Speed sensor (SP2)
P0722 pulses of No. 1 vehicle speed sensor signal are sent
S ECM
(b) Vehicle speed is 9 km/h (6 mph) or more for at least 4 sec.
S Automatic transmission (clutch, brake or gear, etc.)
(c) Park/neutral position switch is OFF.
(d) Transfer position is except neutral (4WD).
Reference (Using an oscilloscope):
2 V/DIV Check the waveform between terminals SP2+ and SP2-
of the ECM connector.
Standard: Refer to the illustration.
GND Terminal SP2+ - SP2-
Tool setting 2V/DIV, 20ms/DIV
Vehicle condition Vehicle speed 20 km/h (12 mph)
20 ms/DIV
C13480 D14149
DIAGNOSTICS - AUTOMATIC TRANSMISSION (A750E/A750F for DI-1181
2UZ-FE)
MONITOR DESCRIPTION
The output speed sensor SP2 monitors the output shaft speed. The ECM controls the gearshift 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, it
will conclude that is a malfunction of the output speed sensor SP2. The ECM will illuminate the MIL and set
a 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
Specification
Item
It
Minimum Maximum
The monitor will run whenever this DTC is
See page DI-1128
not present.
Vehicle speed sensor pulse input 4
Vehicle speed range (4 sec. or more) 9 km/h (5.59 mph) or more -
NSW switch OFF
Battery voltage 8 V or more -
Ignition switch ON
Starter OFF
TYPICAL MALFUNCTION THRESHOLDS
Detection criteria Threshold
Output speed sensor pulse input No input
WIRING DIAGRAM
ECM
V3
Vehicle Speed Sensor (SP2) 34
Y-R SP2+
E6
2 1
26
W-R SP2-
E6
E1
D14163
DI-1182 DIAGNOSTICS - AUTOMATIC TRANSMISSION (A750E/A750F for
2UZ-FE)
INSPECTION PROCEDURE
HINT:
According to the DATA LIST displayed by the OBD II scan tool or hand-held tester, you can read the value
of the switch, sensor, actuator and so on without parts removal. Reading the DATA LIST as the first step of
troubleshooting is one method to shorten labor time.
(a) Warm up the engine.
(b) Turn the ignition switch off.
(c) Connect the OBD II scan tool or hand-held tester to the DLC3.
(d) Turn the ignition switch to the ON position.
(e) Push the "ON" button of the OBD II scan tool or the hand-held tester.
(f) When you use the hand-held tester:
Select the item "DIAGNOSIS / ENHANCED OBD II / DATA LIST".
(g) According to the display on the tester, read the "DATA LIST".
Measurement Item/
Item Normal Condition
Range (display)
Output shaft Speed/ Vehicle stopped: 0 km/h (0 mph)
SPD (SP2) min.: 0 km/h (0 mph) [HINT]
max.: 255 km/h (158 mph) Equal to vehicle speed
HINT:
S SPD (SP2) is always 0 while driving:
Open or short in the sensor or circuit.
S SPD (SP2) is always more than 0 and less than 300 rpm while driving the vehicle at 50 km/h (31 mph)
or more:
Sensor trouble, improper installation, or intermittent connection trouble of the circuit.
1 Inspect speed sensor installation.
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