HYBRID CONTROL SYSTEM, Diagnostic DTC:P0AA1-233

DTC Code	DTC Name
P0AA1-233	Hybrid Battery Positive Contactor Circuit Stuck Closed

DESCRIPTION

Refer to the description for DTC P0AE6-225 Click here.
This circuit uses the power management control ECU to monitor the system main relays and stops the system if a malfunction is detected in the relays, because it may be impossible to shut off the high-voltage system if any of the relays becomes stuck.

DTC No.	INF Code	DTC Detection Condition	Trouble Area
P0AA1	233	SMRP, SMRB and SMRG on the HV battery positive and negative sides are stuck closed.	Hybrid battery junction block assembly Inverter with converter assembly

WIRING DIAGRAM

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

INSPECTION PROCEDURE

CAUTION:

When performing P0AA1-233 troubleshooting, use either a tool wrapped with vinyl insulation tape or an insulated tool. It is extremely dangerous when a high-voltage charge passes through a non-insulated tool causing a short.
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.
After removing 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 Click here.

Tech Tips

Waiting for at least 10 minutes is required to discharge the high-voltage capacitor inside the inverter with converter assembly.

Note

After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work Click here.

Tech Tips

If P0AA1-233 is stored, the hybrid system cannot be turned on.

PROCEDURE

CHECK DTC OUTPUT (HYBRID CONTROL)

Connect the GTS to the DLC3.
Turn the power switch on (IG).
Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.

Check if DTCs are output.

Result

Result	Proceed to
P0AA1-233 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
P0AE0-228	Hybrid Battery Negative Contactor Control Circuit High
P0AE7-224	Hybrid Battery Precharge 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	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"

Tech Tips

*1: If any INF codes are output for this DTC, refer to the corresponding diagnostic procedure.
P0AA1-233 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.

Turn the power switch off.

GO TO DTC CHART (HYBRID CONTROL SYSTEM) Click here

CHECK FREEZE FRAME DATA (HYBRID CONTROL)

Connect the GTS to the DLC3.
Turn the power switch on (IG).
Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.

Read the freeze frame data of DTC P0AA1-233.

Result

Result	Proceed to
VH-Voltage after Boosting minus VL-Voltage before Boosting is 100 V or less.	A
The preceding condition is not satisfied.	B

Turn the power switch off.

REPLACE INVERTER WITH CONVERTER ASSEMBLY Click here

CHECK HYBRID BATTERY JUNCTION BLOCK ASSEMBLY (SMRP, SMRB, SMRG)

CAUTION:

Be sure to wear insulated gloves.

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 manual because this may cause a malfunction.
Remove the upper hybrid battery cover sub-assembly Click here.

Text in Illustration
*a	Component with harness connected (Hybrid Battery Junction Block Assembly)

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

Standard Resistance (SMRB)

Tester Connection	Switch Condition	Specified Condition
V5-1 (CBI) - y2-1 (+)	Power switch off	10 kΩ or higher

Tech Tips

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.

Text in Illustration
*a	Component with harness connected (Hybrid Battery Junction Block Assembly)

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

Standard Resistance (SMRG, SMRP)

Tester Connection	Switch Condition	Specified Condition
V4-1 (CEI) - x1-1 (-)	Power switch off	10 kΩ or higher

Tech Tips

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.
If the resistance is between 28.5 and 31.5 Ω, it can be determined that SMRP is stuck closed.

Install the upper hybrid battery cover sub-assembly.

REPLACE HYBRID BATTERY JUNCTION BLOCK ASSEMBLY Click here