SFI SYSTEM, Diagnostic DTC:P0500

DTC Code	DTC Name
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 pulse signal and outputs it to the ECM via the combination meter. The ECM determines the vehicle speed based on the frequency of this pulse signal.


*1	Pulse Signal
*2	from Wheel Speed Sensor
*3	Skid Control ECU
*4	Combination Meter

DTC No.	DTC Detection Condition	Trouble Area
P0500	While the vehicle is being driven, no vehicle speed signal is transmitted to the ECM (2 trip detection logic).	Open or short in speed signal circuit Wheel speed sensor Combination meter assembly ECM Skid control ECU

MONITOR DESCRIPTION

Automatic Transaxle Models:

The ECM assumes that the vehicle is being driven when the vehicle speed signal from the transmission (SP2) indicates a speed of 9 km/h (6 mph) or more.

If there is no vehicle speed signal from the combination meter (SP1) for 5 seconds when the vehicle is being driven, the ECM determines this to be a malfunction of the vehicle speed sensor. The ECM then illuminates the MIL and stores the DTC.

Manual Transaxle Models:

The ECM assumes that the vehicle is being driven when the idle fuel-cut operation* is being executed. If there is no signal from the vehicle speed sensor despite this condition being met, the ECM interprets this as a malfunction in the speed signal circuit. The ECM then illuminates the MIL and stores the DTC.

*: Idle fuel-cut is executed when the throttle valve is fully closed and engine speed is over 2500 rpm.

WIRING DIAGRAM

for Manual Transmission Models


*a	Skid Control ECU
*b	Combination Meter
*c	to Other ECUs

for Automatic Transmission Models


*a	Skid Control ECU
*b	Combination Meter
*c	to Other ECUs

CAUTION / NOTICE / HINT

Tech Tips

Read freeze frame data using the GTS. 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

CHECK OPERATION OF SPEEDOMETER
1. Drive the vehicle and check whether the operation of the speedometer in the combination meter is normal.
  Tech Tips
  - 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 MALFUNCTION IN SPEEDOMETER Click here

OK
READ VALUE USING GTS (VEHICLE SPEED)
1. Connect the GTS to the DLC3.
2. Turn the ignition switch to ON.
3. Turn the GTS on.
4. Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / Vehicle Speed.
5. Drive the vehicle.
6. Read the value displayed on the GTS.
  
  OK
  
  Vehicle speeds displayed on the GTS and speedometer display are equal.
OK
CHECK FOR INTERMITTENT PROBLEMS Click here

NG

OK
Vehicle speeds displayed on the GTS and speedometer display are equal.

CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - ECM)

Disconnect the combination meter connector.
Disconnect the ECM connector.

Measure the resistance according to the value(s) in the table below.

Standard Resistance

for Manual Transmission Models
Tester Connection	Condition	Specified Condition
E119-6 (+S) - A38-13 (SPD)	Always	Below 1 Ω
E119-6 (+S) or A38-13 (SPD) - Body ground	Always	10 kΩ or higher

for Automatic Transmission Models
Tester Connection	Condition	Specified Condition
E119-6 (+S) - A38-44 (SPD)	Always	Below 1 Ω
E119-6 (+S) or A38-44 (SPD) - Body ground	Always	10 kΩ or higher

Tech Tips

If the wire harness has a short, check the speed signal circuit in other systems related to the vehicle speed signal (e.g. tire pressure warning system, audio system, etc.).

CHECK ALL SYSTEMS RELATED TO SPEED SENSOR SIGNAL AND REPAIR OR REPLACE MALFUNCTIONING HARNESS OR CONNECTOR

CHECK COMBINATION METER ASSEMBLY (+S VOLTAGE)

Text in Illustration
*a	Front view of wire harness connector (to Combination Meter Assembly)

Disconnect the combination meter assembly connector.

Tech Tips

Disconnect the ECU connectors of other systems related to the speed signal, but do not disconnect the ECM connectors.
Turn the ignition switch to ON.

Measure the voltage according to the value(s) in the table below.

Standard Voltage

Tester Connection	Switch Condition	Specified Condition
E119-6 (+S) - Body ground	Ignition switch ON	4.5 to 5.5 V

REPLACE ECM Click here

CHECK COMBINATION METER (SPD SIGNAL OUTPUT WAVEFORM)

Text in Illustration
*a	Component with harness connected (Combination Meter Assembly)

Remove the combination meter assembly.
Connect the combination meter assembly connector.
Move the shift lever to N.
Jack up the vehicle.
Turn the ignition switch to ON.

Check the voltage between the terminal of the combination meter assembly and body ground while the wheels are turned slowly.

Standard Voltage

Tester Connection

Condition

Specified Condition

E119-6 (+S) - Body ground

Ignition switch ON

(Wheels turned slowly)

Voltage generated intermittently

Tech Tips

The output voltage fluctuates up and down, similarly to the diagram, when the wheels are turned slowly.
A voltage of 12 V or 5 V is output from each ECU and then input to the combination meter assembly.

REPLACE ECM Click here

CHECK COMBINATION METER ASSEMBLY (SPD SIGNAL INPUT WAVEFORM)

Text in Illustration
*a	Component with harness connected (Combination Meter Assembly)

Remove the combination meter assembly.
Connect the combination meter assembly connector.
Move the shift lever to N.
Jack up the vehicle.
Turn the ignition switch to ON.

Check the voltage between the terminal of the combination meter assembly and body ground while the wheels are turned slowly.

Standard Voltage

Tester Connection

Condition

Specified Condition

E119-5 (SI) - Body ground

Ignition switch ON

(Wheels turned slowly)

Voltage generated intermittently

Tech Tips

The output voltage fluctuates up and down, similarly to the diagram, when the wheels are turned slowly.

REPLACE COMBINATION METER ASSEMBLY Click here

CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - VSC ACTUATOR WITH ACTUATOR BRACKET ASSEMBLY)

Disconnect the combination meter assembly connector.
Disconnect the VSC actuator with actuator bracket assembly connector.

Measure the resistance according to the value(s) in the table below.

Standard Resistance

Tester Connection	Condition	Specified Condition
E119-5 (SI) - A24-12 (SP1)	Always	Below 1 Ω
E119-5 (SI) or A24-12 (SP1) - Body ground	Always	10 kΩ or higher

REPLACE MASTER CYLINDER SOLENOID Click here

REPAIR OR REPLACE HARNESS OR CONNECTOR