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. Select the following menu items: Powertrain / Hybrid Control / Trouble Codes.
4. Check if DTCs are output.

   Result

   DTC No.	Relevant Part
   P0A1A-156, 658, 659, 151, 155, 200, 791, 792, 793	Generator Control Module
   P0A1B-511, 164, 163, 512, 193, 786, 788, 661, 192, 168, 794, 795, 796	Drive Motor "A" Control Module
   P0A1F (all INF codes) *1	Battery Energy 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, 523, 586, 503, 504, 279, 282, 284, 505, 287, 506, 286, 113, 306	Drive Motor "A" Inverter Performance
   P0A7A-322, 517, 325, 518, 324, 122, 344	Generator Inverter Performance
   P0A90-509	Drive Motor "A" Performance
   P0A92-521	Hybrid Generator Performance
   P0A94-442	DC/DC Converter Performance
   P0AE0-228	Hybrid Battery Negative Contactor Control Circuit High
   P0AE2-161, 773	Hybrid Battery Precharge Contactor Circuit Stuck Closed
   P3004-132	HV Battery Malfunction
   P3105	Battery Observation Communication Circuit Malfunction

   HINT: 

   • *1: If any INF codes are output for this DTC, refer to the corresponding diagnostic flowchart.
   • Turning the power switch on (IG) with the service plug grip and inverter cover removed causes interlock switch system DTC P0A0D-350 to be output.
   • 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.

YES → See step   6 

NO: Go to next step 

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG).
3. Select the following menu items: Powertrain / Hybrid Control / Trouble Codes.
4. Read output DTCs.
5. Read the freeze frame data of P0AA4-232.

   Result

   Result	Proceed to
   IB BATTERY (Current value of HV battery) is less than 3 A.	A
   IB BATTERY (Current value of HV battery) is 3 A or more.	B

A → See step   5 

B: Go to next step 

1. Turn the power switch off and remove the service plug grip. Refer to PRECAUTION .
   Fig 1: Identifying h3 And t1 In HV Relay Assembly Component

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   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. Measure the resistance according to the value(s) in the table below.

   Standard resistance

   Tester Connection	Specified Condition
   h3-1 - t1-1	10 kΩ or more

   HINT: 

   • For the removal and installation procedures related to inspection of the HV relay assembly. Refer to REMOVAL .
   • Leave the HV relay in the vehicle while testing to prevent the movement that occurs during removal from causing a stuck relay to return to normal.
   • If the result of reading the freeze frame data is B, the HV relay assembly must be replaced. Measuring resistance can determine that this is either a present or past malfunction.

NG → See step   4 

OK → See step   4