NR Series 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 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.
- HINT:
- ·
Various systems use the vehicle speed signal distributed from the combination meter assembly. Check all the components possibly related to 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.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | MIL | Memory | Note |
|---|---|---|---|---|---|---|
| P050031 | Vehicle Speed Sensor "A" No Signal | Diagnosis Condition:
·
Vehicle being driven. Abnormal condition: ·
No vehicle speed sensor signal transmitted to ECM. Malfunction Time: ·
5 seconds or more Trip logic: ·
2 trip detection logic Detection Conditions: ·
Continuous Sensors/components used for detection (Main): ·
Vehicle speed sensor ·
Combination meter assembly ·
Skid control ECU ·
Certification 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 |
Comes on | DTC stored | SAE Code:
P0500 |
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
| Frequency of Operation | Continuous |
TYPICAL ENABLING CONDITIONS
| Engine | Running |
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.
·When clearing the permanent DTCs, refer to the "CLEAR PERMANENT DTC" procedure.
Connect the GTS to the DLC3.
Turn the ignition switch to ON.
Turn the GTS 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].
Turn the GTS on.
Start the engine.
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.
Stop the vehicle.
Enter the following menus: Powertrain / Engine / Trouble Codes [C].
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.
Proceed to the next screen and enter the DTC to be checked.
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 shows NORMAL, the system is normal.
·If the judgment result shows ABNORMAL, the system has a malfunction.
·If the judgment result shows INCOMPLETE, perform the Confirmation Driving Pattern and check the DTC judgment result again.
·[A] to [C]: Normal judgment procedure.
The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.
·When clearing the permanent DTCs, do not disconnect the cable from the battery terminal or attempt to clear the DTCs during this procedure, as doing so will clear the universal trip and normal judgment histories.
WIRING DIAGRAM
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.
·If DTC P050031 is output, perform troubleshooting for the transaxle first as the transaxle may have a mechanical malfunction.
PROCEDURE
- HINT:
-
This procedure confirms whether the speedometer is operating correctly.
Connect the GTS to the DLC3.
Start the engine.
Turn the GTS on.
Enter the following menus: Powertrain / Engine / Data List / Vehicle Speed.
- Powertrain > Engine > Data List
-
Tester Display Vehicle Speed - 50003 372 212
Drive the vehicle.
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
B
Check the circuits that send vehicle speed signals to this system in the combination meter system.
- Result:
Proceed to NEXT
NEXT
Disconnect the combination meter assembly connector.
Disconnect the ECM connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection Condition Specified Condition I4-36 (+S) - A46-44 (SPD) Always Below 1 Ω
- Result:
Proceed to OK NG
OK
NG