DTC    P0500    Vehicle Speed Sensor Malfunction

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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 hybrid vehicle control ECU via the combination meter. The hybrid vehicle control ECU determines the vehicle speed based on the frequency of these pulse signals.

A079413E12


DTC No.
DTC Detection Condition
Trouble Area
P0500
Vehicle speed signal from vehicle speed sensor is cut for 0.14 sec. or more while cruise control is in operation
  1. Vehicle speed sensor
  2. Vehicle speed sensor signal circuit
  3. Combination meter
  4. Hybrid vehicle control ECU

WIRING DIAGRAM


A082661E02


INSPECTION PROCEDURE

1.CHECK OPERATION OF SPEEDOMETER

  1. Drive the vehicle and check if operation of the speedometer in the combination meter is normal.

OK:
Actual vehicle speed and the speed indicated on the speedometer are the same.

HINT:
The vehicle speed sensor is operating normally if the speedometer display is normal.



NG
CHECK SPEEDOMETER CIRCUIT
OK


2.READ VALUE OF INTELLIGENT TESTER

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch on.

  1. Select the item "VEHICLE SPD" in the DATA LIST and check that the speed displayed on the tester screen is the same as the one indicated on the combination meter.


Hybrid Vehicle Control ECU (Cruise Control) : 
Item
Measurement Item/Display (Range)
Normal Condition
Diagnostic Note
VEHICLE SPD
Cruise control vehicle speed/min.: 0 km/h (0 mph) max.: 255 km/h (158 mph)
Actual vehicle speed
-

OK:
The speed displayed on the tester screen is almost the same as the speed the one indicated on the combination meter.



NG
Go to step 3
OK

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN ON PROBLEM SYMPTOMS TABLE 

3.INSPECT HYBRID VEHICLE CONTROL ECU (SPD VOLTAGE)

  1. Shift the lever to the neutral position.

  1. Jack up the vehicle.

  1. Turn the ignition switch on.



    E110180E02

  1. Measure the voltage between the specified terminals of the H29 and H32 hybrid vehicle control ECU connectors as the wheel is turned slowly.

Standard voltage:
Tester Connection
Specified Condition
SPDI (H29-24) - E1 (H32-5)
Generated intermittently



    A062954E04

  1. Refer to HINT below.

HINT:
The output voltage should fluctuate up and down similarly to the diagram on the left when the wheel is turned slowly.



NG
Go to step 4
OK

REPLACE HYBRID VEHICLE CONTROL ECU 

4.CHECK HARNESS AND CONNECTOR


    E110177E08

  1. Disconnect the H29 connector of the hybrid vehicle control ECU.



    E110174E01

  1. Disconnect the C8 connector of the combination meter.

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

Standard resistance:
Tester Connection
Condition
Specified Value
H29-24 (SPDI) - C8-6
Always
Below 1 Ω
H29-24 (SPDI) - Body ground
Always
10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE COMBINATION METER ECU