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

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG).
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
   DTCs shown in Table 1 are output simultaneously.	B
   DTCs shown in Table 2 are output simultaneously.	C

   TABLE 1
   
   

   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
   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
   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	ECM/PCM Power Relay Sensor Circuit Intermittent
   P3004-132	Power Cable Malfunction
   P324E-788	MG-ECU Power Relay Intermittent Circuit
   U0110 (all INF codes)*1	Lost Communication with Drive Motor Control Module "A"

   TABLE 2
   
   

   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
   P308A-123	Hybrid Battery Voltage Sensor All Circuits Low

   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 power switch off.

B → See step   6 

C → See step   7 

A: Go to next step 

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG).
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 3 A or more.	A
   HV battery current (IB) is less than 3 A.	B

5. Turn the power switch off.

B → See step   5 

A: 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 power switch on (READY), unless instructed by the repair information because this may cause a malfunction.

2. Remove the upper hybrid battery cover sub-assembly. Refer to REMOVAL - Step 19 .
3. Measure the resistance according to the value(s) in the table below.
   Fig 1: Checking Resistance Of Hybrid Battery Junction Block Assembly

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Resistance

   Tester Connection	Switch Condition	Specified Condition
   T3-1 (CEI) - k2-1 (-)	Power 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 hybrid battery junction block 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 hybrid battery junction block assembly must be replaced. Measuring resistance can determine that this is either a present or past malfunction.
4. Install the upper hybrid battery cover sub-assembly.

NG → See step   4 

OK → See step   4