2ZR-FE Engine Control System
2ZR-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
Automatic Transaxle Models:
The ECM assumes that the vehicle is being driven when the vehicle speed sensor signal is being transmitted by the combination meter. If there is no signal from the combination meter, despite the ECM detecting the speed signal from the speed sensor NC, the ECM interprets this as a malfunction in the speed signal circuit. The ECM then illuminates the MIL and sets the DTC.
Manual Transaxle Models:
The ECM assumes that the vehicle is being driven when the indicated engine speed is 2000 to 5000 rpm and the engine load calculated by the ECM is more than a certain level or the idle fuel-cut operation* is being executed. If there is no signal from the vehicle speed sensor, despite these conditions being met, the ECM interprets this as a malfunction in the speed signal circuit. The ECM then illuminates the MIL and sets the DTC.
*: Idle fuel-cut is executed when the throttle valve is fully closed and engine speed is over 2800 rpm.
MONITOR STRATEGY
TYPICAL ENABLING CONDITIONS
Manual Transaxle Models (Case 1)
Manual Transaxle Models (Case 1):
Manual Transaxle Models (Case 2)
Manual Transaxle Models (Case 2):
Automatic Transaxle Models
Automatic Transaxle Models:
TYPICAL MALFUNCTION THRESHOLDS
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 and warm it up until the ECT reaches 75°C (167°F) or higher [B].
- Accelerate the vehicle to 75 km/h (46 mph) or higher with the accelerator pedal opening angle of 20% or more [C].
CAUTION:
When performing the confirmation driving pattern, obey all speed limits and traffic laws
- Maintain the vehicle speed at 75 km/h (46 mph) or higher for 10 seconds or more [D].
- Decelerate the vehicle by releasing the accelerator pedal for 5 seconds or more to perform fuel cut [E].
- Enter the following menus: Powertrain / Engine and ECT / Trouble Code [F].
- 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 and ECT / Utility / All Readiness.
- Input the DTC: P0500.
- Check the DTC judgment result.
CAUTION:
When performing the confirmation driving pattern, obey all speed limits and traffic laws.
HINT
If the judgment result shows ABNORMAL, the system has a malfunction.
- If the test result is INCOMPLETE or UNKNOWN and no pending 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 the Techstream. Freeze frame data records the engine condition when malfunctions are detected. 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.
PROCEDURE
1. CHECK OPERATION OF SPEEDOMETER
(a) Drive the vehicle and check whether the operation of the speedometer in the combination meter is normal.
OK:
The operation of the speedometer 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 Speedometer Malfunction.
NG -- GO TO MALFUNCTION IN SPEEDOMETER Speedometer Malfunction
OK -- Continue to next step.
2. READ VALUE USING TECHSTREAM (VEHICLE SPEED)
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / Vehicle Speed.
(e) Drive the vehicle.
(f) Read the value displayed on the tester.
OK:
Vehicle speeds displayed on the tester and speedometer display are equal.
NG -- CHECK COMBINATION METER (+S VOLTAGE)
OK -- CHECK FOR INTERMITTENT PROBLEMS
3. CHECK COMBINATION METER (+S VOLTAGE)
(a) Disconnect the combination meter connector.
(b) Turn the ignition switch to ON.
(c) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
(d) Reconnect the combination meter connector.
NG -- CHECK HARNESS AND CONNECTOR (COMBINATION METER - ECM)
OK -- Continue to next step.
4. CHECK COMBINATION METER (SPD SIGNAL WAVEFORM)
(a) Remove the combination meter.
(b) Connect the combination meter connector.
(c) Move the shift lever to the neutral position.
(d) Jack up the vehicle.
(e) Turn the ignition switch to ON.
(f) Check the voltage between the terminal of the combination meter and the 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.
(g) Reinstall the combination meter.
NG -- REPLACE COMBINATION METER Removal
OK -- Continue to next step.
5. CHECK HARNESS AND CONNECTOR (COMBINATION METER - ECM)
(a) Disconnect the combination meter connector.
(b) Disconnect the ECM connector.
(c) Measure the resistance according the value(s) in the table below.
Standard Resistance (Check for Open):
Standard Resistance (Check for Open):
(d) Reconnect the combination meter connector.
(e) Reconnect the ECM connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE ECM Removal