HYBRID CONTROL SYSTEM, Diagnostic DTC:P0AE6-225
| DTC Code | DTC Name |
|---|---|
| P0AE6-225 | Battery Precharge Contactor Control Circuit Low |
DESCRIPTION
The SMRs (System Main Relays) are the relays that connect or disconnect the high voltage power system in accordance with commands from the EV control ECU.
There are 3 SMRs and 1 system main resistor. SMRB, SMRP, SMRG, and the system main resistor are located in the EV battery junction block assembly in the EV battery.
To connect to the high voltage power system, the vehicle will first turn on SMRP and SMRB to charge the vehicle through the system main resistor. Then, SMRP will be turned off after SMRG is turned on. To shut off the high voltage power system, SMRB and SMRG are turned off.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | Warning Indicate |
|---|---|---|---|---|
| P0AE6-225 | Battery Precharge Contactor Control Circuit Low | Short to ground in the SMRP circuit: Primary circuit of SMRP is malfunctioning. (2 trip detection logic) |
|
Master Warning Light: Comes on |
| DTC No. | Data List |
|---|---|
| P0AE6-225 |
|
CAUTION / NOTICE / HINT
CAUTION:
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Before the following operations are conducted, take precautions to prevent electric shock by turning the power switch off, wearing insulated gloves, and removing the service plug grips from both FC stack assembly and EV battery.
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Inspecting the high-voltage system
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Disconnecting the low voltage connector of the inverter with converter assembly
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Disconnecting the low voltage connector of the EV battery
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Disconnecting the low voltage connector of the FC stack assembly
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Disconnecting the low voltage connector of the FC converter assembly
Tech Tips
No removal order is specified for the service plug grips of the FC stack assembly and EV battery.
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After removing the service plug grip from the EV battery, 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 grip from the FC stack assembly, store it in a safe location and use the "HIGH-VOLTAGE, DO NOT TOUCH" sign to notify other technicians that you are working on the high-voltage system.
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*a Without waiting for 10 minutes After removal of the service plug grips of both FC stack assembly and EV battery, wait for at least 10 minutes before touching the high-voltage connectors and 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.
Tech Tips
At least 10 minutes are necessary to discharge the high-voltage capacitors inside the inverter with converter assembly and FC stack assembly.
Note
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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.
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When reinstalling the service plug grip to the FC stack assembly or the EV battery, slide the lever of the service plug until the letters "UNLOCK" are completely hidden, and insert it firmly.
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When the vehicle is parked with the power switch off, if the FC control ECU judges that the FC stack temperature will go below 0°C (32°F), it activates the FC air compressor, hydrogen pump and FC cooling water pump for a maximum of 180 seconds and drains water from the FC stack assembly. When performing inspection or repairs with the power switch off (not on (IG) or on (READY)), disconnect the cable from the negative (-) auxiliary battery terminal before performing work (If the auxiliary battery voltage is needed to conduct inspection, warm up the FC system beforehand).
Tech Tips
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If DTC P0AE6-225 is output, the power switch cannot be turned on (READY).
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After the repair, clear the DTCs, perform the following procedure and check that the same DTC (including pending DTC) is not output.
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Turn the power switch off and wait for 3 minutes or more.
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Turn the power switch on (READY) and wait for 30 seconds or more.
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Turn the power switch off and wait for 4 minutes or more.
PROCEDURE
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CHECK HARNESS AND CONNECTOR (EV CONTROL ECU - BODY GROUND)
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Disconnect the EV control ECU connector.
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*a Rear view of wire harness connector
(to EV Control ECU)
Measure the resistance according to the value(s) in the table below.
Standard Resistance Tester Connection Condition Specified Condition G46-7 (SMRP) - Body ground Power switch off 112 to 274 Ω -
Reconnect the EV control ECU connector.
Result Proceed to OK NG
OK 
REPLACE EV CONTROL ECU Click here
NG 
-
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CHECK HARNESS AND CONNECTOR (EV CONTROL ECU - EV BATTERY JUNCTION BLOCK ASSEMBLY)
CAUTION:
Be sure to wear insulated gloves.
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Check that the service plug grip is not installed to FC stack assembly and EV battery.
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.
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Remove the No. 4 EV battery shield panel.
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Disconnect the EV battery junction block assembly connector.
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Disconnect the EV control ECU connector.
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*a Rear view of wire harness connector
(to EV Control ECU)
*b Rear view of wire harness connector
(to EV Battery Junction Block Assembly)
Measure the resistance according to the value(s) in the table below.
Standard Resistance Tester Connection Condition Specified Condition G46-7 (SMRP) or Q16-4 (SMRP) - Body ground and other terminals Power switch off 10 kΩ or higher -
Reconnect the EV control ECU connector.
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Reconnect the EV battery junction block assembly connector.
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Install the No. 4 EV battery shield panel.
Result Proceed to OK NG
OK
REPLACE EV BATTERY JUNCTION BLOCK ASSEMBLY Click here
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
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