Inspection Procedure

CAUTION:

Before inspecting the high-voltage system, take safety precautions to prevent electrical shocks, such as wearing insulated gloves and removing the service plug grip. After removing the service plug grip, put it in your pocket to prevent other technicians from reconnecting it while you are working on the high-voltage system.
After disconnecting the service plug grip, wait for at least 5 minutes before touching any of the high-voltage connectors or terminals.

HINT:

At least 5 minutes is required to discharge the high-voltage capacitor inside the w/ converter inverter assembly.

CHECK HYBRID VEHICLE CONTROL ECU

Connect the oscilloscope to the HV control ECU terminals specified in the table below and check the waveform.

WAVEFORM SIGNAL REFERENCE

Item	Contents
Terminal	HTM+ (H34-18) - E1 (H31-5) HTM- (H34-17) - E1 (H31-5)
Equipment Setting	1 V/DIV, 2 μs/DIV 1 V/DIV, 200 ms/DIV
Condition	Ignition switch ON

OK: The waveform appears as shown in the illustration.

HINT:

The waveform varies depending on the contents of communication.

NG: GO TO step 4

Fig 1: Checking Hybrid Vehicle Control ECU

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Go to next step

CHECK HYBRID VEHICLE CONTROL ECU

Connect the oscilloscope to the HV control ECU terminals specified in the table below and check the waveform.

WAVEFORM SIGNAL REFERENCE

Item	Contents
Terminal	CLK+ (H34-22) - E1 (H31-5) CLK- (H34-29) - E1 (H31-5)
Equipment Setting	1 V/DIV, 1 μs/DIV
Condition	READY-on state

OK: The waveform appears as shown in the illustration.

NG: GO TO step 5

Fig 2: Checking Hybrid Vehicle Control ECU

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Go to next step

CHECK HYBRID VEHICLE CONTROL ECU

Connect the oscilloscope to the HV control ECU terminals specified in the table below and check the waveform.

WAVEFORM SIGNAL REFERENCE

Item	Contents
Terminal	REQ+ (H34-23) - E1 (H31-5) REQ- (H34-30) - E1 (H31-5)
Equipment Setting	1 V/DIV, 1 ms/DIV
Condition	READY ON

OK: The waveform appears as shown in the illustration.

NG: GO TO step 6

Fig 3: Checking Hybrid Vehicle Control ECU

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: REPLACE W/ CONVERTER INVERTER ASSEMBLY

CHECK HARNESS AND CONNECTOR (HV CONTROL ECU - MG ECU)

CAUTION: Be sure to wear insulated gloves.

Turn the ignition switch off and remove the service plug grip. (See HYBRID CONTROL SYSTEM )
Disconnect the H34 connector from the HV control ECU.
Remove the inverter cover. (See INVERTER WITH CONVERTER )
NOTE:
- Wrap the interlock round terminal for the inverter cover with vinyl tape to prevent it from shorting to ground.
- Be sure to prevent water in the reservoir tank from entering the inverter.
- Removing the inverter cover causes the MG ECU board to be exposed. Therefore, temporarily install the inverter cover for each area to be inspected.
Disconnect the I21 connector from the MG ECU.

Measure the voltage according to the value(s) in the table below when the ignition switch is in the ON position.

HINT:

Turning the ignition switch to the ON position with the service plug grip and inverter cover removed causes interlock switch system DTCs to be output.

Fig 4: Disconnecting I21 Connector From MG ECU

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard Voltage

TESTER CONNECTION AND SPECIFIED CONDITION

Tester Connection	Specified Condition
HTM+ (H34-18) - Body ground	Below 1 V
HTM- (H34-17) - Body ground	Below 1 V

Turn the ignition switch off.

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

Standard Resistance (Check for open)

TESTER CONNECTION AND SPECIFIED CONDITION

Tester Connection	Specified Condition
HTM+ (H34-18) - HTM+ (I21-12)	Below 1 Ω
HTM- (H34-17) - HTM- (I21-13)	Below 1 Ω

Standard Resistance (Check for short)

TESTER CONNECTION AND SPECIFIED CONDITION

Tester Connection	Specified Condition
HTM+ (H34-18) or HTM+ (I21-12) - Body ground	10 kΩ or higher
HTM- (H34-17) or HTM- (I21-13) - Body ground	10 kΩ or higher

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: REPLACE HYBRID VEHICLE CONTROL ECU

CHECK HARNESS AND CONNECTOR (HV CONTROL ECU - MG ECU)

CAUTION: Be sure to wear insulated gloves.

Turn the ignition switch off and remove the service plug grip. (See HYBRID CONTROL SYSTEM )
Disconnect the H34 connector from the HV control ECU.
Remove the inverter cover. (See INVERTER WITH CONVERTER )
NOTE:
- Wrap the interlock round terminal for the inverter cover with vinyl tape to prevent it from shorting to ground.
- Be sure to prevent water in the reservoir tank from entering the inverter.
- Removing the inverter cover causes the MG ECU board to be exposed. Therefore, temporarily install the inverter cover for each area to be inspected.
Disconnect the I21 connector from the MG ECU.

Measure the voltage according to the value(s) in the table below when the ignition switch is in the ON position.

HINT:

Turning the ignition switch to the ON position with the service plug grip and inverter cover removed causes interlock switch system DTCs to be output.

Fig 5: Disconnecting H34 Connector From HV Control ECU

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard Voltage

TESTER CONNECTION AND SPECIFIED CONDITION

Tester Connection	Specified Condition
CLK+ (H34-22) - Body ground	Below 1 V
CLK- (H34-29) - Body ground	Below 1 V

Turn the ignition switch off.

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

Standard Resistance (Check for open)

TESTER CONNECTION AND SPECIFIED CONDITION

Tester Connection	Specified Condition
CLK+ (H34-22) - CLK+ (I21-17)	Below 1 Ω
CLK- (H34-29) - CLK- (I21-18)	Below 1 Ω

Standard Resistance (Check for short)

TESTER CONNECTION AND SPECIFIED CONDITION

Tester Connection	Specified Condition
CLK+ (H34-22) or CLK+ (I21-17) - Body ground	10 kΩ or higher
CLK- (H34-29) or CLK- (I21-18) - Body ground	10 kΩ or higher

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: REPLACE HYBRID VEHICLE CONTROL ECU

CHECK HARNESS AND CONNECTOR (HV CONTROL ECU - MG ECU)

CAUTION: Be sure to wear insulated gloves.

Turn the ignition switch off and remove the service plug grip. (See HYBRID CONTROL SYSTEM )
Disconnect the H34 connector from the HV control ECU.
Remove the inverter cover. (See INVERTER WITH CONVERTER )
NOTE:
- Wrap the interlock round terminal for the inverter cover with vinyl tape to prevent it from shorting to ground.
- Be sure to prevent water in the reservoir tank from entering the inverter.
- Removing the inverter cover causes the MG ECU board to be exposed. Therefore, temporarily install the inverter cover for each area to be inspected.
Disconnect the I21 connector from the MG ECU.

Measure the voltage according to the value(s) in the table below when the ignition switch is in the ON position.

HINT:

Turning the ignition switch to the ON position with the service plug grip and inverter cover removed causes interlock switch system DTCs to be output.

Fig 6: Disconnecting I21 Connector From MG ECU

Standard Voltage

TESTER CONNECTION AND SPECIFIED CONDITION

Tester Connection	Specified Condition
REQ+ (H34-23) - Body ground	Below 1 V
REQ- (H34-30) - Body ground	Below 1 V

Turn the ignition switch off.

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

Standard Resistance (Check for open)

TESTER CONNECTION AND SPECIFIED CONDITION

Tester Connection	Specified Condition
REQ+ (H34-23) - REQ+ (I21-15)	Below 1 Ω
REQ- (H34-30) - REQ- (I21-16)	Below 1 Ω

Standard Resistance (Check for short)

TESTER CONNECTION AND SPECIFIED CONDITION

Tester Connection	Specified Condition
REQ+ (H34-23) or REQ+ (I21-15) - Body ground	10 kΩ or higher
REQ- (H34-30) or REQ- (I21-16) - Body ground	10 kΩ or higher

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: REPLACE HYBRID VEHICLE CONTROL ECU