Engine Control System: SFI System

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

DTC P0500 - Vehicle Speed Sensor "A"

DTC P0503 - Vehicle Speed Sensor "A" Intermittent / Erratic / High

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





WIRING DIAGRAM





INSPECTION 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 and ECT / Data List / Vehicle Speed.
(c) Drive the vehicle at 2500 rpm or more.
Result:






C -- CHECK FOR INTERMITTENT PROBLEM
B -- CHECK ECM (SP2 SIGNAL)
A -- Continue to next step.
2. CHECK WIRE HARNESS (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 AND CONNECTOR
OK -- Continue to next step.
3. CHECK 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) Drive the vehicle at 3000 rpm or more for 10 seconds or more.
(c) Read the DTCs.
Result:






B -- REPLACE ECM
A -- END