DTC P0AA3-73: Hybrid/EV Battery Negative Contactor Actuator Stuck Closed [08/2023 - ]: Procedure

Pre-procedure1

1. None.

   Procedure1

2. Check for DTCs.

   Powertrain > Hybrid Control > Trouble Codes 

   Powertrain > Motor Generator > Trouble Codes 

   Powertrain > HV Battery > Trouble Codes 

   Result

   Result	Proceed to
   P0AA3-73 only is output, or DTCs except the ones in the table below are also output.	A
   DTCs of hybrid control system in the tables below are output.	B
   DTCs of motor generator control system in the tables below are output.	C
   DTCs of hybrid battery system in the tables below are output.	D

   Malfunction Content	System	Relevant DTC
   Microcomputer malfunction	Hybrid control system	P0606-47	Hybrid/EV Powertrain Control Module Processor Watchdog / Safety MCU Failure
   		P0606-87	Hybrid/EV Powertrain Control Module Processor to Monitoring Processor Missing Message
   		P060A-47	Hybrid/EV Powertrain Control Module Monitoring Processor Watchdog / Safety MCU Failure
   		P060A-87	Hybrid/EV Powertrain Control Module Processor from Monitoring Processor Missing Message
   		P0A1B-49	Drive Motor "A" Control Module Internal Electronic Failure
   		P1C9E-9F	Hybrid/EV System Reset Stuck Off
   		P060B-49	Hybrid/EV Powertrain Control Module A/D Processing Internal Electronic Failure
   	Motor generator control system	P0A1B-1F	Generator Control Module Circuit Intermittent
   		P0A1A-47	Generator Control Module Watchdog / Safety MC Failure
   		P0A1A-49	Generator Control Module Internal Electronic Failure
   		P1C2A-1C	Generator A/D Converter Circuit Circuit Voltage Out of Range
   		P1C2A-49	Generator A/D Converter Circuit Internal Electronic Failure
   		P1C2B-1C	Drive Motor "A" Control Module A/D Converter Circuit Voltage Out of Range
   		P1C2B-49	Drive Motor "A" Control Module A/D Converter Circuit Internal Electronic Failure
   		P1CAC-49	Generator Position Sensor Internal Electronic Failure
   		P1CAD-49	Drive Motor "A" Position Sensor Internal Electronic Failure
   		P1CAF-38	Generator Position Sensor REF Signal Cycle Malfunction Signal Frequency Incorrect
   		P1CB0-38	Drive Motor "A" Position Sensor REF Signal Frequency Incorrect
   		P3133-83	Communication Error from Generator to Drive Motor "A" Value of Signal Protection Calculation Incorrect
   		P3133-86	Communication Error from Generator to Drive Motor "A" Signal Invalid
   		P3133-87	Communication Error from Generator to Drive Motor "A" Missing Message
   	Hybrid battery system	P060B-49	Hybrid/EV Battery Energy Control Module A/D Processing Internal Electronic Failure
   		P0606-87	Hybrid/EV Battery Energy Control Module Processor to Monitoring Processor Missing Message
   		P060A-47	Hybrid/EV Battery Energy Control Module Monitoring Processor Watchdog / Safety MCU Failure
   		P060A-87	Hybrid/EV Battery Energy Control Module Processor from Monitoring Processor Missing Message
   		P060B-16	Hybrid/EV Battery Energy Control Module A/D Processing Circuit Voltage Below Threshold
   		P0E2D-00	Hybrid/EV Battery Energy Control Module Hybrid/EV Battery Monitor Performance
   	Plug-in charge control system	P060B-49	Plug-in Control Module A/D Processing Internal Electronic Failure
   Power source circuit malfunction	Motor generator control system	P06D6-1C	Generator Control Module Offset Power Circuit Voltage Out of Range
   		P06B0-1C	Generator Control Module Position Sensor REF Power Source Circuit Voltage Out of Range
   Communication system malfunction	Hybrid control system	P3123-87	Lost Communication with Drive Motor Control Module "A" from Hybrid/EV Control Module Missing Message
   		U0111-87	Lost Communication with Hybrid/EV Battery Energy Control Module "A" Missing Message
   Sensor and actuator circuit malfunction	Hybrid control system	P0AD9-11	Hybrid/EV Battery Positive Contactor Circuit Short to Ground
   		P0AD9-15	Hybrid/EV Battery Positive Contactor Circuit Short to Auxiliary Battery or Open
   		P0ADD-11	Hybrid/EV Battery Negative Contactor Circuit Short to Ground
   		P0ADD-15	Hybrid/EV Battery Negative Contactor Circuit Short to Auxiliary Battery or Open
   		P0AE4-11	Hybrid/EV Battery Precharge Contactor Circuit Short to Ground
   		P0AE4-15	Hybrid/EV Battery Precharge Contactor Circuit Short to Auxiliary Battery or Open
   	Motor generator control system	P0A3F-16	Drive Motor "A" Position Sensor Circuit Voltage Below Threshold
   		P0A4B-16	Generator Position Sensor Circuit Voltage Below Threshold
   		P0A4B-21	Generator Position Sensor Signal Amplitude < Minimum
   		P0A4B-22	Generator Position Sensor Signal Amplitude > Maximum
   		P0C50-13	Drive Motor "A" Position Sensor Circuit "A" Circuit Open
   		P0C50-16	Drive Motor "A" Position Sensor Circuit "A" Circuit Voltage Below Threshold
   		P0C50-17	Drive Motor "A" Position Sensor Circuit "A" Circuit Voltage Above Threshold
   		P0C5A-13	Drive Motor "A" Position Sensor Circuit "B" Circuit Open
   		P0C5A-16	Drive Motor "A" Position Sensor Circuit "B" Circuit Voltage Below Threshold
   		P0C5A-17	Drive Motor "A" Position Sensor Circuit "B" Circuit Voltage Above Threshold
   		P0C64-13	Generator Position Sensor Circuit "A" Circuit Open
   		P0C64-16	Generator Position Sensor Circuit "A" Circuit Voltage Below Threshold
   		P0C64-17	Generator Position Sensor Circuit "A" Circuit Voltage Above Threshold
   		P0C69-13	Generator Position Sensor Circuit "B" Circuit Open
   		P0C69-16	Generator Position Sensor Circuit "B" Circuit Voltage Below Threshold
   		P0C69-17	Generator Position Sensor Circuit "B" Circuit Voltage Above Threshold
   	Hybrid battery system	P301A-1C	Hybrid Battery Stack 1 Cell Voltage Detection Voltage Out of Range
   		P1A00-1C	Hybrid Battery Stack 2 Cell Voltage Detection Voltage Out of Range
   		P1A05-1C	Hybrid Battery Stack 3 Cell Voltage Detection Voltage Out of Range
   		P1A0A-1C	Hybrid Battery Stack 4 Cell Voltage Detection Voltage Out of Range
   		P1AFD-1C	Flying Capacitor/Internal Control Module Hybrid/EV Battery Monitor Voltage Out of Range
   System malfunction	Hybrid control system	P0C76-00	Hybrid/EV Battery System Discharge Time Too Long
   		P0D2D-1C	Drive Motor "A" Inverter Voltage Sensor Voltage Out of Range
   		P1C83-49	High Voltage Power Resource Circuit Voltage Sensor after Boosting Malfunction
   	Motor generator control system	P0D2D-16	Drive Motor "A" Inverter Voltage Sensor (VH) Circuit Voltage Below Threshold
   		P0D2D-17	Drive Motor "A" Inverter Voltage Sensor (VH) Circuit Voltage Above Threshold
   		P1CB6-9E	Drive Motor "A" Inverter Voltage Sensor (VH) Stuck On

   HINT: 

   • P0AA3-73 may be output as a result of the malfunction indicated by the DTCs above.
     1. The chart above is listed in inspection order of priority.
     2. Check DTCs that are output at the same time by following the listed order. (The main cause of the malfunction can be determined without performing unnecessary inspections.)

   Post-procedure1

3. Turn the ignition switch off.

Result: 

B 

GO TO DTC CHART (HYBRID CONTROL SYSTEM). Refer to  DIAGNOSTIC TROUBLE CODE CHART [08/2023 - 10/2024]  , or refer to  DIAGNOSTIC TROUBLE CODE CHART [10/2024 - ] 

Result: 

C 

GO TO DTC CHART (MOTOR GENERATOR CONTROL SYSTEM). Refer to  DIAGNOSTIC TROUBLE CODE CHART [08/2023 - ] 

Result: 

D 

GO TO DTC CHART (HYBRID BATTERY SYSTEM). Refer to  DIAGNOSTIC TROUBLE CODE CHART [08/2023 - ] 

Result: 

A 

See step  2

Pre-procedure1

1. None.

   Procedure1

2. Read the freeze frame data of DTC P0AA3-73.

   Powertrain > Hybrid Control > DTC(P0AA3-73) > Freeze Frame Data 

   Tester Display
   VL-Voltage before Boosting
   VH-Voltage after Boosting

   NOTE:

   As freeze frame data is stored immediately before and after a DTC is stored, make sure to only read the values for the moment the DTC was stored ("0(s)").

   Result

   Result	Proceed to
   Difference between "VL-Voltage before Boosting" and "VH-Voltage after Boosting" is less than 76 V.	A
   Difference between "VL-Voltage before Boosting" and "VH-Voltage after Boosting" is 76 V or more.	B

   HINT: 

   If VH-Voltage after Boosting is output even when an off command is being sent to the system main relay (positive side), P0AA3-73 is output. If the difference between the "VL-Voltage before Boosting" and the "VH-Voltage after Boosting" is large, it is determined that there is an inverter (VH sensor) malfunction.

   Post-procedure1

3. Turn the ignition switch off.

Result: 

B 

REPLACE HYBRID MOTOR CONTROL INVERTER ASSEMBLY. Refer to  REMOVAL [08/2023 - ] 

Result: 

A 

See step  3

Refer to PROCEDURE - Step 1

Result

Result: 

OK 

See step  5

Result: 

NG 

See step  4

Result

Result: 

NEXT 

See step  5

See step  5

Result

Result: 

A 

See step  8

Result: 

C 

See step  7

Result: 

B 

See step  6

Result

Result: 

NEXT 

See step  8

Result

Result: 

NEXT 

See step  8

See step  8

Result

Result: 

A 

See step  11

Result: 

C 

See step  10

Result: 

B 

See step  9

Result

Result: 

NEXT 

See step  11

Result

Result: 

NEXT 

See step  11

Pre-procedure1

1. Check that the service plug grip is not installed.
   NOTE:

   After removing the service plug grip, do not turn the ignition switch ON, unless instructed by the appropriate service information because this may cause a malfunction.

   Procedure1

2. Check the connector connections and contact pressure of the relevant terminals of the No. 2 traction battery device box assembly connector.

   HINT: 

   Refer to ELECTRONIC CIRCUIT INSPECTION PROCEDURE [10/2022 - ]

   OK

   The connectors are connected securely and there are no contact pressure problems.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Result

   Proceed to
   OK
   NG

   Post-procedure1

3. None.

Result: 

OK 

See step  13

Result: 

NG 

See step  12

Result

Result: 

NEXT 

See step  13

See step  13

Result

Result: 

OK 

See step  15

Result: 

NG 

See step  14

Result

Result: 

NEXT 

See step  15

Pre-procedure1

1. Check that the service plug grip is not installed.
   NOTE:

   After removing the service plug grip, do not turn the ignition switch ON (READY), unless instructed by the appropriate service information because this may cause a malfunction.

2. Connect the SST.

   HINT: 

   Refer to Instructions for Connecting SST [08/2023 - ]

3. Disconnect the No. 2 traction battery device box assembly connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

4. Disconnect the hybrid vehicle control ECU connector.

   Procedure1

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

   Standard Resistance (Check for Open)

   Tester Connection	Condition	Specified Condition
   C59-27 (SMRG) - o17-1 (SMRG)	Ignition switch off	Below 1 Ω

   Standard Resistance (Check for Short)

   Tester Connection	Condition	Specified Condition
   C59-27 (SMRG) or o17-1 (SMRG) - Body ground and other terminals	Ignition switch off	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

   Post-procedure1

6. Reconnect the hybrid vehicle control ECU connector.
7. Reconnect the No. 2 traction battery device box assembly connector.
8. Disconnect the SST.

Result: 

OK 

See step  17

Result: 

NG 

See step  16

Result

Result: 

NEXT 

See step  17

Refer to PROCEDURE - Step 13

Result

Result: 

OK 

See step  19

Result: 

NG 

See step  18

Result

Result: 

NEXT 

See step  19

Pre-procedure1

1. Check that the service plug grip is not installed.
   NOTE:

   After removing the service plug grip, do not turn the ignition switch ON (READY), unless instructed by the appropriate service information because this may cause a malfunction.

2. Disconnect the No. 2 traction battery device box assembly connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Procedure1

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

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a

   Component without harness connected (No. 2 traction Battery Device Box Assembly)

   -

   -

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   o17-1 (SMRG) - o17-5 (GND8)	-40 to 80°C (-40 to 176°F)	20.6 to 40.8 Ω

   Result

   Proceed to
   OK
   NG

   Post-procedure1

4. Reconnect the No. 2 traction battery device box assembly connector.

Result: 

NG 

See step  22

Result: 

OK 

See step  20

Pre-procedure1

1. Check that the service plug grip is not installed.
   NOTE:

   After removing the service plug grip, do not turn the ignition switch ON (READY), unless instructed by the appropriate service information because this may cause a malfunction.

2. Disconnect the floor under wire connector from the HV supply battery assembly.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

3. Disconnect the HV battery high voltage connector from the No. 2 traction battery device box assembly.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NOTE:

   Insulate each disconnected high-voltage connector with insulating tape. Wrap the connector from the wire harness side to the end of the connector.

   Procedure1

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   R4-2 (CEI) - z25-1 (-)	Ignition switch off	10 kΩ or higher

   HINT: 

   • If a system main relay is stuck closed, inspect the No. 2 traction battery device box assembly without removing it from the vehicle, in order to keep the relay closed.
   • If the result of reading the freeze frame data is A, the No. 2 traction battery device box assembly must be replaced. Measuring resistance can determine that this is either a present or past malfunction.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Component without harness connected (No. 2 traction Battery Device Box Assembly)

   Result

   Result	Judgment	Proceed to
   OK	Past malfunction	A
   NG	Present malfunction	B

   Post-procedure1

5. Reconnect the HV battery high voltage connector.
6. Reconnect the floor under wire connector.

Result: 

B 

See step  23

Result: 

A 

See step  21

HINT: 

Refer to REMOVAL [08/2023 - ]

Result

Result: 

NEXT 

See step  24

HINT: 

Refer to REMOVAL [08/2023 - ]

Result

Result: 

NEXT 

See step  24

HINT: 

Refer to REMOVAL [08/2023 - ]

Result

Result: 

NEXT 

See step  24

See step  24

Result

Result: 

A 

END 

Result: 

B 

REPLACE HYBRID VEHICLE CONTROL ECU AND NO. 2 TRACTION BATTERY DEVICE BOX ASSEMBLY 

• Hybrid vehicle control ECU:

  Refer to REMOVAL [10/2022 - ]

• No. 2 traction battery device box assembly:

  Refer to REMOVAL [08/2023 - ]