Dtc P0503 Vehicle Speed Sensor Circuit Malfunction

Engine Hybrid System. Yaris. Ncp93, 131
Cruise Control. Yaris. Ncp93, 131

DESCRIPTION

INSPECTION PROCEDURE

SYSTEM CHECK

CHECK FOR DTC (ANTI-LOCK BRAKE SYSTEM)

CHECK FOR DTC (VEHICLE STABILITY CONTROL SYSTEM)

CHECK FOR DTC

DTC P0503 Vehicle Speed Sensor Circuit Malfunction


DESCRIPTION

If a malfunction (a rapid change in vehicle speed) in the vehicle speed signal being output from the skid control ECU*1,*2 or speedometer sensor*3 is detected while cruise control is in operation, the ECM determines there to be a momentary interruption or noise and stores a DTC.

DTC Code
DTC Detection Condition
Trouble Area
P0503
A malfunction in the vehicle speed signal is detected while cruise control is in operation.
  1. Anti-lock brake system*1
  2. Vehicle stability control system*2
  3. Vehicle speed sensor signal circuit
  4. Speedometer sensor*3
  5. Combination meter assembly
  6. ECM
  1. *1: w/ ABS
  2. *2: w/ VSC
  3. *3: w/o ABS

INSPECTION PROCEDURE

1.SYSTEM CHECK

  1. Check the vehicle specifications.

    Result
    Result
    		Proceed to
    w/ ABS (w/o VSC)
    		A
    w/ VSC
    		B
    w/o ABS
    		C



B
Go to step 3

C
Go to step 4
A


2.CHECK FOR DTC (ANTI-LOCK BRAKE SYSTEM)

  1. Check for DTCs (YARIS_NCP93 RM000000XHV0CPX.html).

    OK:
    DTCs are not output.
    Result
    Result
    		Proceed to
    DTC is output
    		A
    DTC is not output
    		B


B
Go to step 4
A

GO TO ANTI-LOCK BRAKE SYSTEM (YARIS_NCP93 RM000000XHU08XX.html)

3.CHECK FOR DTC (VEHICLE STABILITY CONTROL SYSTEM)

  1. Check for DTCs.

    HINT:
    1. for Hatchback with Built-in Type Yaw Rate Sensor (YARIS_NCP93 RM000000XHV0CQX.html).
    2. for Hatchback with Separate Type Yaw Rate Sensor (YARIS_NCP93 RM000000XHV0D3X.html).
    OK:
    DTCs are not output.
    Result
    Result
    		Proceed to
    DTC is not output
    		A
    DTC is output (or Hatchback with Built-in Type Yaw Rate Sensor)
    		B
    DTC is output (for Hatchback with Separate Type Yaw Rate Sensor)
    		C


B
GO TO VEHICLE STABILITY CONTROL SYSTEM (YARIS_NCP93 RM000000XHU08YX.html)

C
GO TO VEHICLE STABILITY CONTROL SYSTEM (YARIS_NCP93 RM000000XHU092X.html)
A


4.CHECK FOR DTC

  1. Clear the DTCs (YARIS_NCP93 RM0000044AZ00KX.html).

  1. Perform the following to make sure the DTC detection conditions are met.

    HINT:
    If the detection conditions are not met, the system cannot detect the malfunction.

    1. Drive the vehicle at a speed of approximately 40 km/h (25 mph) or more.

    2. Turn the cruise control main switch on.

    3. Push the cruise control main switch to -SET to activate cruise control.

  1. Check for DTCs (YARIS_NCP93 RM0000044AZ00KX.html).

    OK:
    DTC P0503 is not output.


NG
GO TO SFI SYSTEM (YARIS_NCP93 RM000000PD90QDX.html)
OK

USE SIMULATION METHOD TO CHECK (YARIS_NCP93 RM00000135202EX.html)