SFI System

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

DESCRIPTION

The speed sensor detects the wheel speed and sends the appropriate signals to the skid control ECU. The skid control ECU converts these wheel speed signals into a 4-pulse signal and outputs it to the ECM via the combination meter. The ECM determines the vehicle speed based on the frequency of these pulse signals.









MONITOR DESCRIPTION

The ECM assumes that the vehicle is being driven when the transmission counter gear indicates more than 300 rpm and over 30 seconds have passed since the park/neutral position switch was turned OFF. If there is no signal from the vehicle speed sensor with these conditions satisfied, the ECM concludes that the vehicle speed sensor is malfunctioning. The ECM will turn on the MIL and a DTC will be set.

MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS





TYPICAL MALFUNCTION THRESHOLDS





CONFIRMATION DRIVING PATTERN





* Connect the Techstream to the DLC3.

* Turn the ignition switch to ON and turn the Techstream on.

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

* Turn the ignition switch off and wait for 30 seconds.

* Turn the ignition switch to ON and turn the Techstream on [A].

* Start the engine.

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

* Stop the vehicle.

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

* Read the DTC [C].

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

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

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

* Input the DTC: P0500.

* 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.
- If the judgment result shows INCOMPLETE or UNKNOWN, perform step [B] again.
* Enter the following menus: Powertrain / Engine / Utility / All Readiness.

* Check the judgment result.

HINT
- If the judgment result shows ABNORMAL, the system has a malfunction.
- If the judgment result shows ABNORMAL, the system is normal.
* If the test result is INCOMPLETE or UNKNOWN and no DTC is output, perform a universal trip and check for permanent DTCs DTC Check / Clear.

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 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. CHECK SPEEDOMETER

(a) Drive the vehicle and check whether the operation of the speedometer in the combination meter is normal.

HINT
- The vehicle speed sensor is operating normally if the speedometer reading is normal.
- If the speedometer does not operate, check it by following the procedure described in speedometer malfunction.
NG -- GO TO SPEEDOMETER CIRCUIT Problem Symptoms Table
OK -- Continue to next step.

2. READ VALUE USING TECHSTREAM (VEHICLE SPEED)

(a) Connect Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Select the following menu items: Powertrain / Engine / Data List / All Data / 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 FOR INTERMITTENT PROBLEMS Check for Intermittent Problems
NG -- Continue to next step.

3. CHECK COMBINATION METER ASSEMBLY (+S VOLTAGE)

(a) Disconnect the combination meter connector.





(b) Turn the ignition switch to ON.

(c) Measure the voltage between the terminal of the combination meter and body ground.

Standard voltage:





(d) Reconnect the combination meter connector.

NG -- CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - ECM)
OK -- Continue to next step.

4. CHECK COMBINATION METER ASSEMBLY (SPD SIGNAL WAVEFORM)

(a) Shift the transmission gear selector lever to the neutral position.





(b) Jack up the vehicle.

(c) Turn the ignition switch to ON.

(d) Measure the voltage between the terminal of the combination meter and body ground while the wheel is turned slowly.

Standard voltage:





HINT
The output voltage should fluctuate up and down, similarly to the diagram, when the wheel is turned slowly.

NG -- REPLACE COMBINATION METER ASSEMBLY Removal and Replacement
OK -- Continue to next step.

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

(a) Disconnect the combination meter connector.

(b) Disconnect the ECM connector.

(c) Measure the resistance.

Standard resistance (Check for open):





Standard resistance (Check for short):





(d) Reconnect the combination meter connector.

(e) Reconnect the ECM connector.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE ECM Components