DTC    P0500    Vehicle Speed Sensor "A"

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DESCRIPTION

Vehicles, which are equipped with ABS (Anti-lock Brake System), detect the vehicle speed using the skid control ECU (brake actuator assembly) 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.

HINT:
  1. A voltage of 12 V or 5 V is output from each ECU and then input to the combination meter assembly.
    The signal is changed to a pulse signal at the transistor in the combination meter assembly. Each ECU controls the respective system based on the pulse signal.
  2. If a short occurs in any of the ECUs or in the wire harness connected to an ECU, all systems using the speed signal will not operate normally.


A079413E13


DTC No.
DTC Detection Condition
Trouble Area
P0500
For Manual Transaxle:
While vehicle being driven, no vehicle speed sensor signal to ECM
(2 trip detection logic)
  1. Open or short in speed signal circuit
  2. Combination meter assembly
  3. Brake actuator assembly
  4. ECM
For CVT:
Following conditions (a) and (b) met for 2.0 seconds or more
(1 trip detection logic):
(a) Transmission revolution sensor signal output (NOUT) 1000 rpm or more
(b) No vehicle speed sensor signal to ECM

WIRING DIAGRAM


A237087E01


INSPECTION PROCEDURE

HINT:
Read freeze frame data using an intelligent tester. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. 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.READ VALUE USING INTELLIGENT TESTER (VEHICLE SPEED)

  1. Connect an 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.
    Result 
    Result
    		Proceed to
    Values displayed on tester and speedometer display not equal
    		A
    Values displayed on tester and speedometer display equal
    		B



B
CHECK FOR INTERMITTENT PROBLEMS (Click here)
A


2.CHECK COMBINATION METER SYSTEM

  1. Inspect the circuits that send vehicle speed signals to this system in the meter system (Click here).

  1. During inspection for the meter section, if there is an instruction that indicates to go back to inspections for each system, proceed to the next step.


NEXT


3.CHECK HARNESS AND CONNECTOR (COMBINATION METER - 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 (Check for Open):
    Tester Connection
    		Condition
    		Specified Condition
    D1-16 (+S) - A18-38 (SPD)
    		Always
    		Below 1 Ω

  1. Reconnect the combination meter assembly connector.

  1. Reconnect the ECM connector.



NG
Go to step 4
OK

REPLACE ECM (Click here)  

4.CHECK HARNESS AND CONNECTOR (ECM - JUNCTION CONNECTOR)

  1. Disconnect the ECM connector.

  1. Disconnect the junction connector.

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

    Standard Resistance (Check for Open):
    Tester Connection
    		Condition
    		Specified Condition
    A18-38 (SPD) - D68-61
    		Always
    		Below 1 Ω

  1. Reconnect the junction connector.

  1. Reconnect the ECM connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPAIR OR REPLACE JUNCTION CONNECTOR