3UZ-FE Engine Control System

3UZ-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0500,P0503: Vehicle Speed Sensor "A"


DESCRIPTION

The vehicle speed sensor outputs a 4 pulse signal for every revolution of the rotor shaft, which is rotated by the transmission output shaft via the driven gear. The ECM determines the vehicle speed based on this signal.









MONITOR DESCRIPTION

The ECM assumes that the vehicle is being driven when the engine RPM is more than 2000 rpm and the Park/Neutral Position (PNP) switch was turned OFF (for 30 seconds). If there is no signal from the vehicle speed sensor when the vehicle is being driven, the ECM interprets this as a malfunction in the vehicle speed sensor. The ECM illuminates the Malfunction Indicator Lamp (MIL) and sets a DTC.

MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS





TYPICAL MALFUNCTION THRESHOLDS





COMPONENT OPERATING RANGE





CONFIRMATION DRIVING PATTERN





- Connect the Techstream to the DLC3.

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

- Clear DTCs (even if no DTCs are stored, perform the clear DTC operation).

- Turn the ignition switch off and wait for at least 30 seconds.

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

- Start the engine.

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

- Stop the vehicle.

- Enter the following menus: Powertrain / Engine / Trouble Codes [C].

- Read the DTCs.

HINT
- If a DTC is output, the system is malfunctioning.
- 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 test result is INCOMPLETE or UNKNOWN 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





INSEPCTION PROCEDURE

HINT
Read freeze frame data using the Techstream. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, 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) On the Techstream, enter the following menus: Powertrain / Engine / Data List / Vehicle Speed.

(c) Drive the vehicle at 2500 rpm or more.

Result:





C -- CHECK FOR INTERMITTENT PROBLEM

B -- INSPECT ECM (SP2 SIGNAL)
A -- Continue to next step.

2. CHECK HARNESS AND CONNECTOR (VEHICLE SPEED SENSOR - ECM)





(a) Disconnect the V1 sensor connector.

(b) Disconnect the E3 ECM connector.

(c) Measure the resistance of the wire harness side connectors.

Standard Resistance:





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

3. INSPECT ECM (SP2 SIGNAL)





(a) Check the waveform of the ECM when the vehicle speed is approximately 60 km/h (37 mph).

OK:









NG -- REPLACE VEHICLE SPEED SENSOR
OK -- Continue to next step.

4. CHECK SENSOR INSTALLATION (VEHICLE SPEED SENSOR)





(a) Check the sensor installation.

OK:

Sensor is installed correctly

NG -- SECURELY REINSTALL SENSOR
OK -- Continue to next step.

5. INSPECT VEHICLE SPEED SENSOR





(a) Measure the resistance of the sensor.

Standard Resistance:

560 to 680 Ohms

NG -- REPLACE VEHICLE SPEED SENSOR
OK -- Continue to next step.

6. CHECK DTC

(a) Connect the Techstream to the DLC3.

(b) Refer to the confirmation driving pattern for P0500 or P0503.

(c) Read the DTCs.

Result:





B -- REPLACE ECM Service and Repair

A -- END