Inspection Procedure

1. Disconnect the H17 HV control ECU connector.
   Fig 1: Disconnecting H17 HV Control ECU Connector

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2. Disconnect the T4 transmission control ECU assembly connector.
   Fig 2: Identifying T4 Transmission Control ECU Assembly Connector

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3. Disconnect the P6 power source control ECU connector.
4. Measure the voltage between the terminals of the HV control ECU connector and body ground.

   Standard voltage 

   TERMINALS VOLTAGE SPECIFICATION
   
   

   Tester Connection	Specified Condition
   PCON (H17-9) - Body ground	Below 1 V
   PPOS (H17-10) - Body ground	Below 1 V

5. Measure the resistance between the wire harness side connectors.

   Standard resistance (Check for open) 

   Fig 3: Identifying P6 Power Source Control ECU Connector

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   TERMINALS RESISTANCE SPECIFICATION
   
   

   Tester Connection	Specified Condition
   PCON (H17-9) - PCON (T4-7)	Below 1 Ω
   PPOS (H17-10) - PPOS (T4-8)	Below 1 Ω
   PPOS (H17-10) - P (P6-5)	Below 1 Ω

   Standard resistance (Check for short) 

   TERMINALS RESISTANCE SPECIFICATION
   
   

   Tester Connection	Specified Condition
   PCON (H17-9) or PCON (T4-7) - Body ground	10 kΩ or higher
   PPOS (H17-10) or PPOS (T4-8) - Body ground	10 kΩ or higher
   PPOS (H17-10) or P (P6-5) - Body ground	10 kΩ or higher

6. Reconnect the power source control ECU connector.
7. Reconnect the transmission control ECU assembly connector.
8. Reconnect the HV control ECU connector.

NG : REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK : GO TO NEXT STEP 

1. Inspect the HV control ECU using an oscilloscope.
2. Turn the power switch ON (IG).
   Fig 4: Identifying HV Control ECU Connector

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3. Check the waveforms of the voltages between the terminals PCON (H17-9) and GND1 (H14-1), and terminals PPOS (H17-10) and GND1 (H14-1), of the HV control ECU connectors, in order to check for +B short in the signal lines PCON and PPOS.

   OK : No +B short in either PCON or PPOS signal lines. 

   HINT:

   • If there is +B short in the signal line, the output voltage is constantly between 9 V and 14 V.
   • If the signal lines are normal, the waveforms are displayed as shown in the diagram.

NG : REPAIR OR REPLACE HARNESS OR CONNECTOR 

Fig 5: Signal Waveform Graph

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK : GO TO NEXT STEP 

1. Connect the intelligent tester to the DLC3.
2. Turn the power switch ON (IG).
3. Turn the intelligent tester ON.
4. Enter the following menus: DIAGNOSIS / OBD/MOBD / T/M CONTROL / DTC INFO / TROUBLE CODES.
5. Read DTCs.

   Result: DTCs are output 

YES : GO TO RELEVANT  DIAGNOSTIC TROUBLE CODE CHART 

NO : REPLACE HV CONTROL ECU, TRANSMISSION ECU AND POWER SOURCE CONTROL ECU