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:
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.
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). |
| 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
Related DTCs | P0500: Vehicle speed sensor verify pulse input |
Required Sensors/Components (Main) | Vehicle speed sensor Combination meter Skid control ECU |
Required Sensors/Components (Related) | Park/neutral position switch 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
All of the following conditions are met | - |
Battery voltage | 8 V or higher |
Engine switch | On (IG) |
Starter | Off |
Time after engine switch off to on (IG) | 3 seconds or more |
Engine | Running |
Vehicle speed sensor monitor condition | Met |
Lost communication with TCM (U0101) | Not detected |
TYPICAL MALFUNCTION THRESHOLDS
Vehicle speed sensor signal | No signal |
CONFIRMATION DRIVING PATTERN
HINT:
Click here
Click here
CAUTION:
When performing the confirmation driving pattern, obey all speed limits and traffic laws.
HINT:
Techstream Display | Description |
---|---|
NORMAL |
|
ABNORMAL |
|
INCOMPLETE |
|
HINT:
The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.
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.
PROCEDURE
1. | READ VALUE USING TECHSTREAM (VEHICLE SPEED) |
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG).
(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 |
B | CHECK FOR INTERMITTENT PROBLEMS |
|
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 |
---|---|---|
G17-19 (+S) - A25-39 (SPD) | Always | Below 1 Ω |
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 here
|
4. | CLEAR DTC |
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG).
(c) Turn the Techstream on.
(d) Clear the DTC.
Powertrain > Engine > Clear DTCs(e) Turn the engine switch off and wait for at least 30 seconds.
|
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 CodesHINT:
If no DTCs (no pending DTCs) are output to the Techstream, the repair has been successfully completed.
NEXT | END |