- Open or short in speed sensor SP2 circuit
- Speed sensor SP2
- ECM
- Automatic transmission (clutch, brake, gear, etc.)
| Last Modified: 11-27-2007 | 1.6 C | |
| Service Category: Drivetrain | Section: Automatic Transmission/Transaxle | |
| Model Year: 2008 | Model: LX570 | Doc ID: RM0000012TD01XX |
| Title: AB60F AUTOMATIC TRANSMISSION / TRANSAXLE: AUTOMATIC TRANSMISSION SYSTEM: DESCRIPTION (2008 LX570) | ||
|
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. 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 the conditions below are detected 500 times or more continuously (2-trip detection logic). (a) No signal from the speed sensor SP2 is input to the ECM while 4 pulses of the No. 1 vehicle speed sensor signal are sent. (b) The vehicle speed is 9 km/h (6 mph) or more for at least 5 sec. (c) The park/neutral position switch is off. (d) The transfer is not in neutral. |
|
Reference: Inspect using an oscilloscope.
Check the waveform of the ECM connector.
Standard:
|
Terminal No. (Symbol) |
Tool Setting |
Condition |
Specified Condition |
|---|---|---|---|
|
C53-101 (SP2+) - C53-100 (SP2-) |
2 V/DIV., 2 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 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 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 |
P0500 (VSS) P0748 (Trans solenoid (range)) |
|
Transfer position |
Not neutral |
|
Vehicle speed at vehicle speed sensor |
9 km/h (5.59 mph) or more |
|
Battery voltage |
8 V or higher |
|
Engine switch |
On (IG) |
|
Starter |
OFF |
TYPICAL MALFUNCTION THRESHOLDS
|
Speed sensor signal |
No signal |
COMPONENT OPERATING RANGE
|
Vehicle speed at output speed sensor |
9 km/h (5.59 mph) or more |
WIRING DIAGRAM
INSPECTION PROCEDURE
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 engine switch off.
(c) Connect the Techstream to the DLC3.
(d) Turn the engine switch on (IG).
(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) |
- |
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 less 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. |
|
|
2. |
INSPECT SPEED SENSOR SP2 |
|
(a) Disconnect the C42 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 |
|
|
3. |
CHECK HARNESS AND CONNECTOR (SPEED SENSOR SP2 - ECM) |
|
(a) Disconnect the C53 ECM connector. |
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
C53-101 (SP2+) - C53-100 (SP2-) |
20°C (68°F) |
560 to 680 Ω |
|
C53-101 (SP2+) - Body ground |
Always |
10 kΩ or higher |
|
C53-100 (SP2-) - Body ground |
Always |
10 kΩ or higher |
|
|
|