Brand:

Toyota

Model Name:

Yaris NCP90 91 92 93

Manual:

Repair Manual

Section:

1Nz-Fe Engine Control System

Title:

Sfi System

  1. Description

  2. Wiring diagram

  3. Inspection procedure

  4. Check operation of speedometer

  5. Read value using intelligent tester (vehicle speed)

  6. Check harness and connector (combination meter assembly - ecm)

  7. Check combination meter assembly (voltage)

  8. Check combination meter assembly (spd signal output waveform)

  9. Check combination meter assembly (spd signal input waveform)

  10. Check harness and connector (combination meter assembly - skid control ecu)

DTC P0500 Vehicle Speed Sensor "A"


​

DESCRIPTION

  1. For w/o ABS models.
The vehicle speed is detected using the speedometer sensor. The speedometer sensor transmits a 4-pulse signal for every revolution of the rotor shaft, which is rotated by the transaxle output shaft via the driven gear. The 4-pulse signal is converted into a more precise rectangular waveform by the waveform shaping circuit inside the combination meter. The signal is then transmitted to the ECM. The ECM determines the vehicle speed based on the frequency of the pulse signal.

For w/ ABS models. Yaris

  1. For w/ ABS models.
Vehicles that are equipped with ABS (Anti-lock Brake System) detect the vehicle speed using the skid control ECU and wheel speed sensor. The wheel speed sensor monitors the wheel rotation speed and sends a signal to the skid control ECU. The skid control ECU converts the wheel speed signal into a 4-pulse signal and transmits it to the ECM via the combination meter. The ECM determines the vehicle speed based on the frequency of the pulse signal.

Open or short in speed signal circuit Yaris


DTC No.
DTC Detection Conditions
Trouble Areas
P0500
While vehicle being driven, no vehicle speed sensor signal to ECM.
(1 trip detection logic: Automatic transaxle)
(2 trip detection logic: Manual transaxle)
  1. Open or short in speed signal circuit
  2. Combination meter
  3. ECM
  4. Brake actuator (skid control ECU)
  5. Vehicle speed sensor

WIRING DIAGRAM


Various systems use the vehicle speed signal distributed from the combination meter. Check all the components possibly related to speed signal. Yaris


INSPECTION PROCEDURE

HINT:
  1. Various systems use the vehicle speed signal distributed from the combination meter. Check all the components possibly related to speed signal.
  2. Read freeze frame data using the intelligent tester. Freeze frame data record 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.
1.CHECK OPERATION OF SPEEDOMETER

  1. 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:
    1. The vehicle speed sensor is operating normally if the speedometer reading is normal.
    2. If the speedometer does not operate, check it by following the procedure described in Speedometer Malfunction for Hatchback (Click here) or Sedan (Click here).


NGnext
GO TO MALFUNCTION IN SPEEDOMETER
OK
next down

2.READ VALUE USING INTELLIGENT TESTER (VEHICLE SPEED)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to ON and turn the tester on.

  1. Enter the following menus: Powertrain / Engine and ECT / Data List / Vehicle Speed.

  1. Drive the vehicle.

  1. Read the value displayed on the tester.

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


NGnext
Go to step 3
OK
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CHECK FOR INTERMITTENT PROBLEMS (Click here)

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

  1. Disconnect the combination meter assembly connector.

  1. Disconnect the ECM connector.

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

    Standard Resistance:

    Tester Connection
    		Condition
    		Specified Condition
    D1-16 - A21-8 (SPD)
    		Always
    		Below 1 Ω
    D1-16 or A21-8 (SPD) - Body ground
    		Always
    		10 kΩ or higher
    HINT:
    If the wire has a short, check the speed signal circuit in other systems related to the vehicle speed signal (e.g. radio receiver, power steering ECU, etc.).


NGnext
REPAIR OR REPLACE HARNESS OR CONNECTOR (OTHER SYSTEMS RELATED TO SPEED SIGNAL)
OK
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4.CHECK COMBINATION METER ASSEMBLY (VOLTAGE)
  1. Disconnect the combination meter assembly connector.HINT: Disconnect the ECU connectors on the other systems related to the speed signal (but the ECM connector must be connected). Yaris

  2. Disconnect the combination meter assembly connector.

    HINT:
    Disconnect the ECU connectors on the other systems related to the speed signal (but the ECM connector must be connected).

  1. Turn the ignition switch to ON.

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

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    D1-16 - Body ground
    		Ignition switch ON
    		4.5 to 14 V
    Text in Illustration
    *a
    		Front view of wire harness connector
    (to Combination Meter Assembly)


NGnext
REPLACE ECM (Click here)
OK
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5.CHECK COMBINATION METER ASSEMBLY (SPD SIGNAL OUTPUT WAVEFORM)
  1. Move the shift lever to N (neutral). Yaris

  2. Move the shift lever to N (neutral).

  1. Jack up the vehicle.

  1. Turn the ignition switch to ON.

  1. Check the voltage between the terminal of the combination meter and the body ground while the wheel is turned slowly.

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    D1-16 - Body ground
    		Ignition switch ON
    (Turn wheel slowly)
    		Voltage generated intermittently
    Text in Illustration
    *A
    		LHD
    *B
    		RHD
    *a
    		Component with wire harness connected
    (Combination Meter Assembly)
    *b
    		Turn wheel
    HINT:
    The output voltage should fluctuate up and down, similarly to the diagram, when the wheel is turned slowly.
    Result
    Result
    		Proceed to
    NG (w/ ABS)
    		A
    NG (w/o ABS)
    		B
    OK
    		C


Bnext
REPLACE COMBINATION METER ASSEMBLY

Cnext
REPLACE ECM (Click here)
A
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6.CHECK COMBINATION METER ASSEMBLY (SPD SIGNAL INPUT WAVEFORM)
  1. Move the shift lever to N (neutral). Yaris

  2. Move the shift lever to N (neutral).

  1. Jack up the vehicle.

  1. Turn the ignition switch to ON.

  1. Check the voltage between the terminal of the combination meter and the body ground while the wheel is turned slowly.

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    D1-17 - Body ground
    		Ignition switch ON
    (Turn wheel slowly)
    		Voltage generated intermittently
    Text in Illustration
    *A
    		LHD
    *B
    		RHD
    *a
    		Component with wire harness connected
    (Combination Meter Assembly)
    *b
    		Turn wheel
    HINT:
    The output voltage should fluctuate up and down, similarly to the diagram, when the wheel is turned slowly.


NGnext
Go to step 7
OK
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REPLACE COMBINATION METER ASSEMBLY

7.CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - SKID CONTROL ECU)

  1. Check harness and connector (w/ ABS for Sedan).

    1. Disconnect the skid control ECU connector.

    2. Disconnect the combination meter assembly connector.

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

      Standard Resistance:

      Tester Connection
      		Condition
      		Specified Condition
      A76-22 (SP1) - D1-17
      		Always
      		Below 1 Ω
      A76-22 (SP1) or D1-17 - Body ground
      		Always
      		10 kΩ or higher

  1. Check harness and connector (w/ ABS for Hatchback).

    1. Disconnect the skid control ECU connector.

    2. Disconnect the combination meter assembly connector.

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

      Standard Resistance:

      Tester Connection
      		Condition
      		Specified Condition
      A15-22 (SP1) - D1-17
      		Always
      		Below 1 Ω
      A15-22 (SP1) or D1-17 - Body ground
      		Always
      		10 kΩ or higher

  1. Check harness and connector (w/ ABS and VSC).

    1. Disconnect the skid control ECU connector.

    2. Disconnect the combination meter assembly connector.

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

      Standard Resistance:

      Tester Connection
      		Condition
      		Specified Condition
      A31-11 (SP1) - D1-17
      		Always
      		Below 1 Ω
      A31-11 (SP1) or D1-17 - Body ground
      		Always
      		10 kΩ or higher


NGnext
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
next down
REPLACE BRAKE ACTUATOR ASSEMBLY (SKID CONTROL ECU)