Inspection Procedure

1. Drive the vehicle and check if the function 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 functioning normally when the indication on the speedometer is normal.

NG : GO TO SPEEDOMETER CIRCUIT 

OK : GO TO NEXT STEP 

1. Check the DATA LIST for proper functioning of the vehicle speed signal.

   Hybrid vehicle control ECU 

   DIAGNOSTIC CHART
   
   

   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 is displayed	-

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

OK : PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE 

NG : GO TO NEXT STEP 

1. Turn the power switch ON (IG).
2. Move the shift lever to neutral.
3. Jack up the vehicle.
4. Measure the voltage of the connector.

   Standard voltage 

   STANDARD VOLTAGE CHART
   
   

   Tester Connection	Specified Condition
   SPDI (H14-19) - Body ground	Waveform appears

   HINT:

   The output voltage fluctuates up and down when the wheel is turned slowly.

Fig 1: Output Voltage Fluctuation

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK : REPLACE HYBRID VEHICLE CONTROL ECU 

NG : GO TO NEXT STEP 

1. Disconnect the H14 ECU connector.
2. Disconnect the C10 meter connector.
3. Measure the resistance of the wire harness side connectors.

   Standard resistance 

   STANDARD RESISTANCE CHART
   
   

   Tester Connection	Specified Condition
   SPDI (H14-19) - C10-13	Below 1 Ω

   Fig 2: Checking Wire Harness (ECU - Meter)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG : REPAIR OR REPLACE HARNESS AND CONNECTOR 

OK : REPLACE COMBINATION METER ASSEMBLY