Last Modified: 05-13-2024 |
6.11:8.1.0 |
Doc ID: RM1000000028Q2T |
Model Year Start: 2023 |
Model: Corolla Hatchback |
Prod Date Range: [11/2022 - 03/2023] |
Title: M20A-FKS (ENGINE CONTROL): SFI SYSTEM: P050031; Vehicle Speed Sensor "A" No Signal; 2023 MY Corolla Corolla Hatchback [11/2022 - 03/2023] |
DTC
|
P050031
|
Vehicle Speed Sensor "A" No Signal
|
DESCRIPTION
-
w/ Smart Key System
-
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 detects the wheel speed of all 4 wheels and outputs a 4-pulse signal to the ECM via the certification ECU (smart key ECU assembly) and combination meter assembly. The ECM determines the vehicle speed based on the frequency of the pulse signal.
-
w/o Smart Key System
-
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.
DTC No.
|
Detection Item
|
DTC Detection Condition
|
Trouble Area
|
MIL
|
Memory
|
Note
|
P050031
|
Vehicle Speed Sensor "A" No Signal
|
Diagnosis condition:
Abnormal condition:
-
No vehicle speed sensor signal transmitted to ECM.
Malfunction time:
Trip logic:
Detection conditions:
Sensors/components used for detection (Main):
-
Vehicle speed sensor
-
Combination meter assembly
-
Certification ECU (smart key ECU assembly) (w/ Smart Key System)
-
Skid control ECU
Sensors/components used for detection (Related):
-
Park/neutral position switch assembly
-
Engine coolant temperature sensor
-
Crankshaft position sensor
-
Speed sensor
-
Throttle position sensor
-
Mass air flow meter sub-assembly
|
-
Open or short in speed signal circuit
-
Combination meter assembly
-
ECM
-
Speed signal circuit
|
Comes on
|
DTC stored
|
-
SAE Code: P0500
-
DTC for Mexico Models: Applies
|
MONITOR DESCRIPTION
When the vehicle is being driven, if no vehicle speed signal is received for 5 seconds or more, the ECM determines that the vehicle speed signal circuit is malfunctioning and illuminates the MIL and stores a DTC.
MONITOR STRATEGY
Related DTCs
|
P0500: Vehicle speed sensor verify pulse input
|
Required Sensors/Components (Main)
|
Vehicle speed sensor
Combination meter assembly
Certification ECU (smart key ECU assembly) (w/ Smart Key System)
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
|
Duration
|
5 seconds
|
MIL Operation
|
2 driving cycles
|
Sequence of Operation
|
None
|
TYPICAL ENABLING CONDITIONS
Monitor runs whenever the following DTCs are not present
|
None
|
All of the following conditions are met
|
-
|
Battery voltage
|
8 V or higher
|
Ignition switch
|
ON
|
Starter
|
Off
|
Engine
|
Running
|
Time after ignition switch off to ON
|
3 seconds or more
|
Vehicle speed sensor monitor condition
|
Met
|
TYPICAL MALFUNCTION THRESHOLDS
Vehicle speed sensor signal
|
No signal
|
CONFIRMATION DRIVING PATTERN
HINT:
-
After repair has been completed, clear the DTC and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.
Click here
-
When clearing the permanent DTCs, refer to the "CLEAR PERMANENT DTC" procedure.
Click here
-
Connect the Techstream to the DLC3.
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Turn the ignition switch to ON.
-
Turn the Techstream on.
-
Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
-
Turn the ignition switch off and wait for at least 30 seconds.
-
Turn the ignition switch to ON [A].
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Turn the Techstream on.
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Start the engine [B].
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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.
-
Stop the vehicle.
-
Enter the following menus: Powertrain / Engine / Trouble Codes [D].
-
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.
-
Enter the following menus: Powertrain / Engine / Utility / All Readiness.
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Proceed to the next screen and enter the DTC to be checked.
-
Check the DTC judgment result.
Techstream 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
|
WIRING DIAGRAM
CAUTION / NOTICE / HINT
HINT:
-
Read Freeze Frame Data using the Techstream. 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.
-
If DTC P050031 is output, perform troubleshooting for the transaxle first as the transaxle may have a mechanical malfunction.
Click here
PROCEDURE
1.
|
READ VALUE USING TECHSTREAM (VEHICLE SPEED)
|
HINT:
This procedure confirms whether the speedometer is operating correctly.
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Enter the following menus: Powertrain / Engine / Data List / Vehicle Speed.
Powertrain > Engine > Data List
Tester Display
|
Vehicle Speed
|
(e) Drive the vehicle.
(f) Read the value displayed on the Techstream.
Result
|
Proceed to
|
Values displayed on Techstream and speedometer display not equal
|
A
|
Values displayed on Techstream and speedometer display equal
|
B
|
A
|
|
|
2.
|
CHECK COMBINATION METER SYSTEM
|
(a) Check the circuits that send vehicle speed signals to this system in the combination meter system.
for 12.3 Inch Display: Click here
except 12.3 Inch Display: Click here
NEXT
|
|
|
3.
|
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
|
I4-8 (+S) - A47-42 (SPD)
|
Always
|
Below 1 Ω
|
NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR
|
|