7GR-FKS ENGINE CONTROL SFI 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 speed sensor. The speed sensor monitors the wheel rotation speed and sends a signal to the skid control ECU. The skid control ECU converts the wheel speed signal 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.

2.74,0.625 3.333,0.833 0.594,0.208 10 4-Pulse 4.708,0.615 5.25,0.833 0.542,0.219 10 4-Pulse 5.75,1.167 6.167,1.417 0.417,0.25 10 ECM 3.021,1.854 4.948,2.115 1.927,0.26 10 Combination Meter Assembly 1.604,1.083 2.417,1.5 0.813,0.417 10 Skid Control ECU 0.229,1.198 1.167,1.583 0.938,0.385 10 From Speed Sensor

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 (2 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.

MONITOR STRATEGY

Required Sensors/Components (Main)	Vehicle speed sensor Combination meter Skid control ECU
Required Sensors/Components (Related)	Park/neutral position switch assembly Engine coolant temperature sensor Crankshaft position sensor Speed Sensor Throttle position sensor Mass air flow meter sub-assembly
Frequency of Operation	Continuous

TYPICAL ENABLING CONDITIONS

for Automatic Transmission Models:
Engine	Running

for Manual Transmission Models:
Fuel-cut	On

TYPICAL MALFUNCTION THRESHOLDS

Vehicle speed sensor signal

No signal

CONFIRMATION DRIVING PATTERN

for Automatic Transmission Models:

1.292,0.875 1.958,1.219 0.667,0.344 10 false 24 km/h 1.417,2 1.906,2.292 0.49,0.292 10 false Idling 0.646,2.385 2.104,2.563 1.458,0.177 10 false Ignition Switch ON 2.385,2.219 2.615,2.385 0.229,0.167 10 false [A] 4.708,0.417 4.917,0.583 0.208,0.167 10 false [C] 6.25,3.229 6.448,3.427 0.198,0.198 10 false [D] 3.719,2.969 5.635,3.115 1.917,0.146 10 false Total of 30 seconds or more 2.938,1.917 3.146,2.083 0.208,0.167 10 false [B]

1.

Connect the GTS to the DLC3.

2.

Turn the ignition switch to ON.

3.

Turn the GTS on.

4.

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

5.

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

6.

Turn the ignition switch to ON [A].

7.

Turn the GTS on.

8.

Start the engine [B].

9.

Drive the vehicle at 24 km/h (15 mph) or more for a total of 30 seconds or more [C].

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

10.

Stop the vehicle.

11.

Enter the following menus: Powertrain / Engine / Trouble Codes [D].

12.

Read the pending DTCs.

HINT:: ·

If a pending DTC is output, the system is malfunctioning.

·

If a pending DTC is not output, perform the following procedure.

13.

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

14.

Input the DTC: P050031.

15.

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

HINT:: ·

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

·

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

·

If the judgment result is INCOMPLETE, perform steps [C] through [D] again.

for Manual Transmission Models:

6.083,2.948 5.906,3.531 5.906,3.531 5.531,3.531 false 1.323,0.885 1.844,1.156 0.521,0.271 10 false 24 km/h 1.417,2.052 1.813,2.313 0.396,0.26 10 false Idling 0.656,2.396 2.375,2.594 1.719,0.198 10 false Ignition Switch ON 2.385,2.271 2.615,2.438 0.229,0.167 10 false [A] 4.708,0.469 4.917,0.635 0.208,0.167 10 false [B] 6.25,3.292 6.448,3.49 0.198,0.198 10 false [D] 6.063,1.125 6.26,1.323 0.198,0.198 10 false [C] 4.01,3.052 5.823,3.313 1.813,0.26 10 false Total of 30 seconds or more 4.323,3.448 5.51,3.594 1.188,0.146 10 false 5 seconds or more

1.

Connect the GTS to the DLC3.

2.

Turn the ignition switch to ON.

3.

Turn the GTS on.

4.

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

5.

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

6.

Turn the ignition switch to ON [A].

7.

Turn the GTS on.

8.

Start the engine.

9.

Drive the vehicle at 24 km/h (15 mph) or more for a total of 30 seconds or more [B].

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

10.

Decelerate the vehicle by releasing the accelerator pedal for 5 seconds or more to perform the fuel-cut [C].

11.

Stop the vehicle.

12.

Enter the following menus: Powertrain / Engine / Trouble Codes [D].

13.

Read the pending DTCs.

HINT:: ·

If a pending DTC is output, the system is malfunctioning.

·

If a pending DTC is not output, perform the following procedure.

14.

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

15.

Input the DTC: P050031.

16.

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

HINT:: ·

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

·

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

·

If the judgment result is INCOMPLETE, perform steps [B] through [D] again.

WIRING DIAGRAM

0.135,1.469 1.615,1.865 1.479,0.396 10 false from Skid Control ECU 2.063,1.365 2.25,1.573 0.188,0.208 10 false 20 2.323,1.365 2.635,1.563 0.313,0.198 10 false SI 3.51,1.354 3.823,1.552 0.313,0.198 10 false +S 3.833,1.344 4.073,1.552 0.24,0.208 10 false 36 2.125,2.313 2.74,2.51 0.615,0.198 10 false N22 2.125,2.469 4.219,2.875 2.094,0.406 10 false Combination Meter Assembly 5.021,2.667 6.5,3.042 1.479,0.375 10 false to Other ECUs 4.865,1.365 5.177,1.563 0.313,0.198 10 false 24 5.104,1.375 5.563,1.573 0.458,0.198 10 false SPD 5.563,2.417 6.021,2.615 0.458,0.198 10 false ECM 5.563,2.26 6.021,2.458 0.458,0.198 10 false N1

CAUTION / NOTICE / HINT

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.

Connect the GTS to the DLC3.

b.

Turn the ignition switch to ON.

c.

Turn the GTS on.

d.

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

Powertrain > Engine > Data List

Tester Display
Vehicle Speed

50003 372 212

e.

Drive the vehicle.

f.

Read the value displayed on the GTS.

Result:

Result	Proceed to
Values displayed on GTS and speedometer display not equal	A
Values displayed on GTS and speedometer display equal	B

A

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

B

CHECK FOR INTERMITTENT PROBLEMS

Click hereEngine / Hybrid System>7GR-FKS (ENGINE CONTROL)>SFI SYSTEM>CHECK FOR INTERMITTENT PROBLEMS201902,999999,_51,_078720,_0381907,RM100000001G2VP,

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

a.

Disconnect the combination meter assembly connector.

b.

Disconnect the ECM connector.

c.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
N22-36 (+S) - N1-24 (SPD)	Always	Below 1 Ω

Result:

Proceed to
OK
NG

OK

3.CHECK COMBINATION METER SYSTEM

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.CHECK COMBINATION METER SYSTEM

a.

Check the circuits that send vehicle speed signals to this system in the combination meter system.

Click hereVehicle Interior>METER / GAUGE / DISPLAY>METER / GAUGE SYSTEM>Speed Signal Circuit201902,201906,_58,_078337,_0379907,RM100000001FQUK,201906,202107,_58,_078337,_0379907,RM100000001ITFD,202107,202310,_58,_078337,_0379907,RM100000001Y27X,202310,202409,_58,_078337,_0379907,RM100000002G4TD,202409,999999,_58,_078337,_0379907,RM100000002PU0I,

Result:

Proceed to
NEXT

4.CLEAR DTC

a.

Connect the GTS to the DLC3.

b.

Turn the ignition switch to ON.

c.

Turn the GTS on.

d.

Clear the DTC.

Powertrain > Engine > Clear DTCs: 50002 372

e.

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

Result:

Proceed to
NEXT

5.CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

a.

Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

b.

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

c.

Read the DTCs.

Powertrain > Engine > Trouble Codes: 50001 372

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

Result:

Proceed to
NEXT