Inspection Procedure

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  (See Speedometer Malfunction )

OK: Go to next step 

1. Connect the intelligent tester to the DLC3.
2. Turn the ignition switch on.
3. 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.

CCS: 

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 IN  PROBLEM SYMPTOMS TABLE  

1. Shift the lever to the neutral position.
2. Jack up the vehicle.
3. Turn the ignition switch on.
4. Measure the voltage between the specified terminals of the H29 and H31 hybrid vehicle control ECU connectors as the wheel is turned slowly.

   Standard voltage 

   TESTER CONNECTION SPECIFIED CONDITION
   
   

   Tester Connection	Specified Condition
   H29-24 (SPDI) - H31-5 (E1)	Generated intermittently

   Fig 1: Identifying Terminals Of H29 And H31 Hybrid Vehicle Control ECU Connectors

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
5. 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 

Fig 2: Identifying Output Voltage Pattern

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OK: REPLACE HYBRID VEHICLE CONTROL ECU  (See HYBRID VEHICLE CONTROL ECU )

1. Disconnect the H29 connector of the hybrid vehicle control ECU.
   Fig 3: Disconnecting H29 Connector Of Hybrid Vehicle Control ECU

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the C8 connector of the combination meter.
3. Measure the resistance according to the value(s) in the table below.

Standard resistance 

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

Fig 4: Disconnecting C8 Connector Of Combination Meter

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OK: REPLACE COMBINATION METER ECU  (See COMBINATION METER )