DTC P0AA4-232: Hybrid Battery Negative Contactor Circuit Stuck Closed: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON.
3. Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.
4. Check if DTCs are output.

   Result

   Result	Proceed to
   P0AA4-232 only is output.	A
   Any of the following DTCs are also output.	B

   DTC No.	Relevant Diagnosis
   P0A1A-151, 155, 156, 200, 658, 659, 791, 792, 793	Generator Control Module
   P0A1B-163, 164, 168, 193, 511, 512, 661, 786, 794, 795, 796	Drive Motor "A" Control Module
   P0A1C-708, 709, 710, 715, 797, 798, 799	Drive Motor "B" Control Module
   P0A1D-148	Hybrid Powertrain Control Module
   P0A3F-243	Drive Motor "A" Position Sensor Circuit
   P0A40-500	Drive Motor "A" Position Sensor Circuit Range/Performance
   P0A41-245	Drive Motor "A" Position Sensor Circuit Low
   P0A45-669	Drive Motor "B" Position Sensor Circuit
   P0A46-671	Drive Motor "B" Position Sensor Circuit Range/Performance
   P0A47-670	Drive Motor "B" Position Sensor Circuit Low
   P0A4B-253	Generator Position Sensor Circuit
   P0A4C-513	Generator Position Sensor Circuit Range/Performance
   P0A4D-255	Generator Position Sensor Circuit Low
   P0A78-266, 267, 586	Drive Motor "A" Inverter Performance
   P0A94-442	DC / DC Converter Performance
   P0ADB-227	Hybrid Battery Positive Contactor Control Circuit Low
   P0ADC-226	Hybrid Battery Positive Contactor Control Circuit High
   P0ADF-229	Hybrid Battery Negative Contactor Control Circuit Low
   P0AE0-228	Hybrid Battery Negative Contactor Control Circuit High
   P0AE6-225	Hybrid Battery Precharge Contactor Control Circuit Low
   P0AE7-224	Hybrid Battery Precharge Contactor Control Circuit High
   P0AFC-129	Hybrid Battery Pack Sensor Module
   P0C76-523	Hybrid Battery System Discharge Time Too Long
   P2511-149	HV CPU Power Relay Sense Circuit Intermittent No Continuity
   P3004-132	Power Cable Malfunction
   P310A-711	Communication Error from RMG to Motor
   P310B-662	Communication Error from Motor to RMG
   P324E-788	MG-ECU Power Relay Intermittent Circuit
   U0110 (all INF codes)*1	Lost Communication with Drive Motor Control Module "A"

   HINT: 

   • *1: If any INF codes are output for this DTC, refer to the corresponding diagnostic procedure.
   • P0AA4-232 may be output due to a malfunction which causes the DTCs in the table above to be output. In this case, first troubleshoot the output DTCs in the table above. Then, perform a reproduction test to check that no DTCs are output.
5. Turn the ignition switch off.

B → See step   7 

A: Go to next step 

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON.
3. Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.
4. Check if DTCs are output.

   Result

   Result	Proceed to
   P0AA4-232 only is output.	A
   Any of the following DTCs are also output.	B

   DTC No.	Relevant Diagnosis
   P0AFC-123	Hybrid Battery Pack Sensor Module
   P0B3D-123	Hybrid Battery Voltage Sensor "A" Circuit Low
   P0B42-123	Hybrid Battery Voltage Sensor "B" Circuit Low
   P0B47-123	Hybrid Battery Voltage Sensor "C" Circuit Low
   P0B4C-123	Hybrid Battery Voltage Sensor "D" Circuit Low
   P0B51-123	Hybrid Battery Voltage Sensor "E" Circuit Low
   P0B56-123	Hybrid Battery Voltage Sensor "F" Circuit Low
   P0B5B-123	Hybrid Battery Voltage Sensor "G" Circuit Low
   P0B60-123	Hybrid Battery Voltage Sensor "H" Circuit Low
   P0B65-123	Hybrid Battery Voltage Sensor "I" Circuit Low
   P0B6A-123	Hybrid Battery Voltage Sensor "J" Circuit Low
   P0B6F-123	Hybrid Battery Voltage Sensor "K" Circuit Low
   P0B74-123	Hybrid Battery Voltage Sensor "L" Circuit Low
   P0B79-123	Hybrid Battery Voltage Sensor "M" Circuit Low
   P0B7E-123	Hybrid Battery Voltage Sensor "N" Circuit Low
   P0B83-123	Hybrid Battery Voltage Sensor "O" Circuit Low
   P0B88-123	Hybrid Battery Voltage Sensor "P" Circuit Low
   P308A-123	Hybrid Battery Voltage Sensor All Circuits Low

   HINT: 

   P0AA4-232 may be output due to a malfunction which causes the DTCs in the table above to be output. In this case, first troubleshoot the output DTCs in the table above. Then, perform a reproduction test to check that no DTCs are output.

5. Turn the ignition switch off.

B → See step   8 

A: Go to next step 

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON.
3. Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.
4. Read the freeze frame data of DTC P0AA4-232.

   Result

   Result	Proceed to
   HV battery current (IB) is less than 3 A.	A
   HV battery current (IB) is 3 A or more.	B

5. Turn the ignition switch off.

A → See step   6 

B: Go to next step 

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

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

2. Remove the battery cover sub-assembly. Refer to REMOVAL .
3. Measure the resistance according to the value(s) in the table below.
   Fig 1: Identifying J3, Z31 Connector & Hybrid Battery Junction Block Assembly

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Resistance

   Tester Connection	Switch Condition	Specified Condition
   j3-1 - z31-1	Ignition switch off	10 kΩ or higher

   TEXT IN ILLUSTRATION
   
   

   *1	Hybrid Battery Junction Block Assembly

   HINT: 

   • If a system main relay is stuck closed, inspect the HV relay assembly without removing it from the vehicle in order to keep the relay closed.
   • If the result of reading the freeze frame data is B, the HV battery junction block must be replaced. Measuring resistance can determine that this is either a present or past malfunction.
4. Install the battery cover sub-assembly. Refer to INSTALLATION .

NG → See step   5 

OK → See step   5