Home

Toyota Workshop

GSIC - Global Service Information Center

DTC    P0AA1-231    Hybrid Battery Positive Contactor Circuit Stuck Closed

for Preparation Click here


DESCRIPTION

Refer to the description for DTC P0AE6-225 (Click here).

DTC No.
INF Code
DTC Detection Condition
Trouble Area
P0AA1
231
SMRB on the HV battery positive side is stuck closed.
  1. Hybrid battery junction block
  2. Inverter with converter assembly

WIRING DIAGRAM

Refer to the wiring diagram for DTC P0AE6-225 (Click here).

INSPECTION PROCEDURE

CAUTION:
  1. Before inspecting the high-voltage system or disconnecting the low voltage connector of the inverter with converter assembly, take safety precautions such as wearing insulated gloves and removing the service plug grip to prevent electrical shocks. After removing the service plug grip, put it in your pocket to prevent other technicians from accidentally reconnecting it while you are working on the high-voltage system.
  2. After disconnecting the service plug grip, wait for at least 10 minutes before touching any of the high-voltage connectors or terminals. After waiting for 10 minutes, check the voltage at the terminals in the inspection point in the inverter with converter assembly. The voltage should be 0 V before beginning work.

HINT:
  1. Waiting for at least 10 minutes is required to discharge the high-voltage capacitor inside the inverter with converter assembly.
  2. If P0AA1-231 is stored, the hybrid system cannot be turned on.

1.CHECK DTC OUTPUT (HV)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the power switch on (IG).

  1. Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.

  1. Check if DTCs are output.

    Result:
    Result
    		Proceed to
    P0AA1-231 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
    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
    		HV CPU Power Relay Sense Circuit Intermittent No Continuity
    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"

    HINT:
    1. *1: If any INF codes are output for this DTC, refer to the corresponding diagnostic procedure.
    2. P0AA1-231 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.

  1. Turn the power switch off.



B
GO TO DTC CHART (Click here)
A


2.CHECK FREEZE FRAME DATA

  1. Connect the intelligent tester to the DLC3.

  1. Turn the power switch on (IG).

  1. Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.

  1. Read the freeze frame data of DTC P0AA1-231.

    Result:
    Result
    		Proceed to
    Pre-boost voltage (VL) is less than 60 V.
    		A
    Post-boost voltage (VL) is 60 V or more.
    		B

  1. Turn the power switch off.



A
REPLACE INVERTER WITH CONVERTER ASSEMBLY (Click here)
B


3.CHECK HYBRID BATTERY JUNCTION BLOCK

CAUTION:
Be sure to wear insulated gloves.

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

    NOTICE:
    After removing the service plug grip, do not turn the power switch on (READY), unless instructed by the repair manual because this may cause a malfunction.

  1. Remove the upper hybrid battery cover sub-assembly (Click here).

  1. Disconnect the high voltage cable connectors from the hybrid battery junction block assembly.



    A215625E01

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

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    T4-1 - h2-1
    		Power switch off
    		10 kΩ or higher

    Text in Illustration 
    *1
    		Hybrid Battery Junction Block

    HINT:
    1. 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.
    2. If the result of reading the freeze frame data is B, the hybrid battery junction block must be replaced. Measuring resistance can determine that this is either a present or past malfunction.

  1. Connect the high voltage cable connectors.

  1. Install the upper hybrid battery cover sub-assembly (Click here).



NG
REPLACE HYBRID BATTERY JUNCTION BLOCK (Click here)
OK

REPLACE HYBRID BATTERY JUNCTION BLOCK (Click here)