DTC P0AA1-231: Hybrid Battery Positive Contactor Circuit Stuck Closed [10/2014 - 10/2015]: 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 for DTCs.

   Result

   Result	Proceed to
   P0AA1-231 only is output, or DTCs except the ones in the table below are also output.	A
   Any of the following DTCs including pending 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
   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
   P0ADC-226	Hybrid Battery Positive Contactor Control Circuit High
   P0C76-523	Hybrid Battery System Discharge Time Too Long
   P2511-149	ECM/PCM Power Relay Sensor Circuit Intermittent
   P3004-132	High Voltage Power Resource
   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.
   • P0AA1-231 may be stored due to a malfunction which causes the DTCs in the preceding table to be stored. In this case, first troubleshoot the output DTCs in the preceding table. Then, perform a reproduction test to check that no DTCs are output.
5. Turn the power switch off.

Result: 

B 

GO TO DTC CHART (HYBRID CONTROL SYSTEM) 

(Refer to DIAGNOSTIC TROUBLE CODE CHART [10/2014 - 10/2015] )

Result: 

A 

See step  2

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 P0AA1-231.

   Result

   Result	Proceed to
   "VL-Voltage before Boosting" is 55 V or more.	A
   "VL-Voltage before Boosting" is less than 55 V.	B

5. Turn the power switch off.

Result: 

B 

REPLACE INVERTER WITH CONVERTER ASSEMBLY 

(Refer to COMPONENTS [10/2014 - ] )

Result: 

A 

See step  3

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.

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 otherwise instructed because this may cause a malfunction.

2. Remove the No. 1 hybrid battery shield sub-assembly (Refer to PROCEDURE - Step 10 ).
3. Measure the resistance according to the value(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   b2-1 (CBI) - A-1 (+)	Power switch off	10 kΩ or higher

4. Install the No. 1 hybrid battery shield sub-assembly.

Result: 

OK 

REPLACE HV BATTERY JUNCTION BLOCK ASSEMBLY 

(Refer to COMPONENTS [10/2014 - ] )

Result: 

NG 

REPLACE HV BATTERY JUNCTION BLOCK ASSEMBLY 

(Refer to COMPONENTS [10/2014 - ] )