SFI System

2GR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0500: Vehicle Speed Sensor "A"
P0500 - Vehicle Speed Sensor "A"

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.









MONITOR DESCRIPTION

If there is no speed signal from the combination meter 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 sets the DTC.

MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS





TYPICAL MALFUNCTION THRESHOLDS





CONFIRMATION DRIVING PATTERN





1. Connect the Techstream to the DLC3.

2. Turn the engine switch on (IG) and turn the Techstream on.

3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure) Reading and Clearing Diagnostic Trouble Codes.

4. Turn the engine switch off and wait for 30 seconds.

5. Turn the engine switch on (IG) and turn the Techstream on.

6. Start the engine.

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

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

8. Stop the vehicle.

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

10. Read the DTC.

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

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

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

13. Input the DTC: P0500.

14. Check the DTC judgment result.





HINT
- If the judgment result shows ABNORMAL, the system has a malfunction.
- If the judgment result shows NORMAL, the system is normal.

15. If the test result is INCOMPLETE or N/A and no DTC is output, perform a universal trip and check for permanent DTCs Reading and Clearing Diagnostic Trouble Codes.

HINT
- If a permanent DTC is output, the system is malfunctioning.
- If no permanent DTC is output, the system is normal.

WIRING DIAGRAM





INSPECTION PROCEDURE

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 be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air-fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction Freeze Frame Data.

PROCEDURE

1. READ VALUE USING TECHSTREAM (VEHICLE SPEED)

(a) Connect the Techstream to the DLC3.

(b) Start the engine.

(c) Turn the Techstream on.

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

(e) Drive the vehicle.

(f) Read the value displayed on the Techstream.

OK:

Vehicle speeds displayed on Techstream and speedometer display are equal.

OK -- CHECK INTERMITTENT PROBLEMS Check for Intermittent Problems
NG -- Continue to next step.

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

(a) Disconnect the E20 combination meter connector.

(b) Disconnect the A10 ECM connector.

(c) Measure the resistance.

Standard resistance (Check for open):





(d) Reconnect the combination meter connector.

(e) Reconnect the ECM connector.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

3. CHECK COMBINATION METER ASSEMBLY (SPD SIGNAL WAVEFORM)

(a) Inspect the circuits that send vehicle speed signals to this system in the combination meter system Speed Signal Circuit.

(b) During inspection for the meter section, if there is an instruction that indicates to go back to inspections for each system, proceed to the next step.

NEXT -- REPLACE ECM Removal