K313 CVT CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM P050031 Vehicle Speed Sensor "A" No Signal

DESCRIPTION

Vehicles which are equipped with ABS (Anti-lock Brake System) detect the vehicle speed using the skid control ECU (brake actuator assembly) and wheel speed sensors. Each wheel speed sensor monitors the wheel rotation speed and sends a signal to the skid control ECU. The skid control ECU converts the wheel speed signals into a 4-pulse signal and transmits it to the ECM via the combination meter assembly. The ECM determines the vehicle speed based on the frequency of the pulse signal.

HINT:: ·

Various systems use the vehicle speed signal distributed from the combination meter assembly. Check all the components possibly related to the speed signal.

·

A voltage of 12 V or 5 V is output from each ECU and then input to the combination meter assembly. The signal is changed to a pulse signal at the transistor in the combination meter assembly. Each ECU controls the respective system based on the pulse signal.

·

If a short occurs in any of the ECUs or in the wire harness connected to an ECU, all systems using the speed signal will not operate normally.

0.406,1.25 1.563,1.698 1.156,0.448 10 false from Wheel Speed Sensors 1.813,1.958 3.229,2.125 1.417,0.167 10 false Skid Control ECU 3.5,1.958 5.333,2.125 1.833,0.167 10 false Combination Meter Assembly 3.115,0.604 3.927,0.781 0.813,0.177 10 false 4-Pulse 5.042,0.604 5.854,0.781 0.813,0.177 10 false 4-Pulse 6.073,1.844 6.521,2.01 0.448,0.167 10 false ECM

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	Memory	Note
P050031	Vehicle Speed Sensor "A" No Signal	While vehicle being driven, no vehicle speed sensor signal transmitted to ECM (1-trip detection logic).	· Open or short in speed signal circuit · Combination meter assembly · ECM	Comes on	DTC stored	SAE Code: P0500

MONITOR DESCRIPTION

If there is no speed signal from the combination meter assembly even though the ECM determines that the vehicle is being driven, the ECM interprets this as a malfunction in the speed signal circuit. The ECM then illuminates the MIL and stores this DTC.

CONFIRMATION DRIVING PATTERN

CAUTION:: When performing the confirmation driving pattern, obey all speed limits and traffic laws.

HINT:: ·

After repairs have been completed, clear the DTCs and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.

·

When clearing the permanent DTCs, refer to the Clear Permanent DTC procedure.

Click hereDrivetrain>K313 (CVT)>CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM>DTC CHECK / CLEAR201906,999999,_52,_080728,_0392261,RM100000001HP9A,

1.

Connect the GTS to the DLC3.

2.

Turn the ignition switch to ON and turn the GTS on.

3.

Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).

4.

Turn the ignition switch off and wait for 2 minutes or more.

5.

Turn the ignition switch to ON and turn the GTS on.

6.

Start the engine.

7.

Perform the D Position Shift Test inspection in Road Test. [*1]

Click hereDrivetrain>K313 (CVT)>CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM>ROAD TEST201906,202304,_52,_080728,_0392261,RM100000001HPAA,202304,999999,_52,_080728,_0392261,RM100000002B1MO,

HINT:: [*1]: Normal judgment procedure.; The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.

8.

Stop the vehicle.

9.

Enter the following menus: Powertrain / Transmission / Utility / All Readiness.

10.

Input the DTC: P050031.

11.

Check the DTC judgment result.

GTS Display	Description
NORMAL	· DTC judgment completed · System normal
ABNORMAL	· DTC judgment completed · System abnormal
INCOMPLETE	· DTC judgment not completed · Perform driving pattern after confirming DTC enabling conditions
N/A	· Unable to perform DTC judgment · Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit

HINT:: ·

If the judgment result shows NORMAL, the system is normal.

·

If the judgment result shows ABNORMAL, the system has a malfunction.

·

If the judgment result shows INCOMPLETE or N/A, perform the normal judgment procedure again.

WIRING DIAGRAM

Refer to Speed Signal Circuit.

Click hereVehicle Interior>METER / GAUGE / DISPLAY>METER / GAUGE SYSTEM (for Optitron Meter Type, Gasoline Model)>Speed Signal Circuit201906,202101,_58,_080793,_0393493,RM100000001HY0Y,202101,202104,_58,_080793,_0393493,RM100000001TN4X,202104,202107,_58,_080793,_0393493,RM100000001W0DG,202107,202205,_58,_080793,_0393493,RM100000001X5R4,202205,202304,_58,_080793,_0393493,RM100000002380M,202304,202403,_58,_080793,_0598151,RM100000002B2Y0,202403,202406,_58,_080793,_0598151,RM100000002K9FX,202406,202502,_58,_080793,_0598151,RM100000002NEGE_02,

CAUTION / NOTICE / HINT

CAUTION:: ·

Strictly observe posted speed limits, traffic laws and road conditions.

·

Do not drive the vehicle with the cable of the GTS contacting the pedals, shift lever or steering wheel.

·

Driving the vehicle with the cable of the GTS contacting these areas could impede vehicle control, resulting in a serious accident.; ·

Do not operate the GTS while driving the vehicle.

·

Operating the GTS while driving the vehicle will prevent you from paying sufficient attention to vehicle surroundings, and could result in a serious accident.

NOTICE:: ·

Perform the universal trip to clear permanent DTCs.

Click hereDrivetrain>K313 (CVT)>CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM>DTC CHECK / CLEAR201906,999999,_52,_080728,_0392261,RM100000001HP9A,

·

Perform initialization when parts related to the continuously variable transaxle system are replaced.

Click hereDrivetrain>K313 (CVT)>CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM>INITIALIZATION201906,999999,_52,_080728,_0392261,RM100000001HP98,

·

Check that no DTCs are stored after performing initialization.

Click hereDrivetrain>K313 (CVT)>CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM>DTC CHECK / CLEAR201906,999999,_52,_080728,_0392261,RM100000001HP9A,

HINT:: Read freeze frame data using the GTS. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.

PROCEDURE

1.READ VALUE USING GTS (VEHICLE SPEED)

a.

Drive the vehicle and check whether the operation of the speedometer is normal.

HINT:: ·

The vehicle speed sensor is operating normally if the speedometer reading is normal.

·

If the speedometer does not operate, check it by following the diagnostic procedure for a malfunction of the speedometer.

b.

Connect the GTS to the DLC3.

c.

Turn the ignition switch to ON and turn the GTS on.

d.

Enter the following menus: Powertrain / Transmission / Data List / Vehicle Speed.

Powertrain > Transmission > Data List

Tester Display
Vehicle Speed

50003 373 212

e.

Drive the vehicle.

f.

According to the display on the GTS, read the Data List.

Powertrain > Transmission > Data List

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
Vehicle Speed	Vehicle speed	Min.: 0 km/h (0 mph) Max.: 255 km/h (158 mph)	Actual vehicle speed	· This is the current vehicle speed. · The vehicle speed is detected using the wheel speed sensors. - There is a delay in when the vehicle speed data is displayed. Therefore, even if the vehicle speed listed in the freeze frame data is 0 km/h (0 mph), this does not always mean that the malfunction occurred when the vehicle was stopped.

OK:: The values displayed on the GTS and speedometer are equal.

Result:

Proceed to
OK
NG

OK

CHECK FOR INTERMITTENT PROBLEMS

Click hereDrivetrain>K313 (CVT)>CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM>CHECK FOR INTERMITTENT PROBLEMS201906,999999,_52,_080728,_0392261,RM100000001HP95,

NG

2.CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - ECM)

a.

Disconnect the I4 combination meter assembly connector.

b.

Disconnect the A46 ECM connector.

c.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
A46-44 (SPD) - I4-36 (+S)	Always	Below 1 Ω

d.

Connect the A46 ECM connector.

e.

Connect the I4 combination meter assembly connector.

Result:

Proceed to
OK
NG

OK

3.CHECK METER / GAUGE SYSTEM

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.CHECK METER / GAUGE SYSTEM

a.

Proceed to Speed Signal Circuit in Meter/Gauge System.

Click hereVehicle Interior>METER / GAUGE / DISPLAY>METER / GAUGE SYSTEM (for Optitron Meter Type, Gasoline Model)>Speed Signal Circuit201906,202101,_58,_080793,_0393493,RM100000001HY0Y,202101,202104,_58,_080793,_0393493,RM100000001TN4X,202104,202107,_58,_080793,_0393493,RM100000001W0DG,202107,202205,_58,_080793,_0393493,RM100000001X5R4,202205,202304,_58,_080793,_0393493,RM100000002380M,202304,202403,_58,_080793,_0598151,RM100000002B2Y0,202403,202406,_58,_080793,_0598151,RM100000002K9FX,202406,202502,_58,_080793,_0598151,RM100000002NEGE,

Result:

Proceed to
NEXT

4.CONFIRM MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

a.

Connect the GTS to the DLC3.

b.

Turn the ignition switch to ON.

c.

Turn the GTS on.

d.

Clear the DTCs.

Powertrain > Transmission > Clear DTCs: 50002 373

e.

Turn the ignition switch off and wait for at least 30 seconds.

f.

Start the engine.

g.

Turn the GTS on.

h.

Drive the vehicle at 24 km/h (15 mph) or more.

i.

Enter the following menus: Powertrain / Transmission / Trouble Codes.

j.

Read the DTCs.

Powertrain > Transmission > Trouble Codes: 50001 373

HINT:: If no DTCs (including pending DTCs) are output, the repair has been successfully completed.

Result:

Proceed to
NEXT