P0AE6

L110 HYBRID VEHICLE CONTROL: HYBRID CONTROL SYSTEM: P0AE6-225: Hybrid Battery Precharge Contactor Control Circuit Low

DTC P0AE6-225 - Hybrid Battery Precharge Contactor Control Circuit Low

DESCRIPTION

The SMRs (System Main Relay) are the relays that connect or disconnect the high voltage power system in accordance with commands from the hybrid vehicle control ECU.
The SMR system is composed of three SMRs and one system main resistor. SMRB and SMRG are located on the HV relay assembly in the battery carrier under the HV battery. SMRP and the system main resistor are located in the hybrid vehicle converter (DC/DC converter) assembly in the battery carrier.
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.
When there is an open in the AMD line or IGCT line, the following DTCs are output:

P0AE6-225 is output first because the time required for diagnosis is the shortest.

MONITOR DESCRIPTION

The hybrid vehicle control ECU monitors the proper operation of the SMRP. If the hybrid vehicle control ECU detects an open or short in the SMRP circuit, the hybrid vehicle control ECU will illuminate the MIL and set a DTC.

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

TYPICAL MALFUNCTION THRESHOLDS

COMPONENT OPERATING RANGE

WIRING DIAGRAM

INSPECTION PROCEDURE
CAUTION:
- 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 disconnecting the service plug grip, wait for at least 10 minutes before touching any of the high-voltage connectors or terminals. After waiting, check the voltage at the inspection point in the inverter with converter assembly. The voltage should be 0 V before beginning work.
HINT: Waiting for at least 10 minutes is required to discharge the high-voltage capacitor inside the inverter with converter assembly.

PROCEDURE

1. CHECK DTC OUTPUT (HV)
(a) Connect the Techstream to the DLC3.
(b) Turn the power switch on (IG).
(c) Select the following menu items: Powertrain / Hybrid Control / Trouble Codes.
(d) Check if DTCs are output.
(e) Refer to "Proceed to" in the table below to perform each inspection.
Result:

HINT:
- o : DTCs that are output
- - : DTCs that are not output

C -- CHECK FRAME WIRE (AUXILIARY BATTERY POSITIVE TERMINAL AND AMD TERMINAL)
B -- CHECK FUSE (IGCT NO. 3)
A -- CHECK FRAME WIRE (AUXILIARY BATTERY POSITIVE TERMINAL AND AMD TERMINAL)
D -- Continue to next step.
2. CHECK FRAME WIRE (AUXILIARY BATTERY POSITIVE TERMINAL AND AMD TERMINAL VOLTAGE)

(a) Turn the power switch off.
(b) Measure the voltage according to the value(s) in the table below.
Standard voltage:

NG -- CHECK AUXILIARY BATTERY
OK -- Continue to next step.
3. CHECK ENGINE ROOM R/B NO. 1 (FUSIBLE LINK AND FUSE)

(a) Check the fusible link (DC/DC) and the fuse (IGCT NO. 3) in the engine room R/B No. 1, and the fusible link (MAIN) that is installed at the auxiliary battery, for improper installation and for open circuits.
Result:
They are connected securely. There are no open circuits in the fusible links or fuse.
NG -- REPLACE FUSE
OK -- Continue to next step.
4. CHECK CONNECTOR CONNECTION CONDITION (HYBRID VEHICLE CONTROL ECU CONNECTOR)
(a) Turn the power switch off.

(b) Check the connections of the hybrid vehicle control ECU connectors.
Result:
The connectors are connected securely and there are no contact problems.
NG -- CONNECT SECURELY
OK -- Continue to next step.
5. CHECK HYBRID VEHICLE CONVERTER (AMD TERMINAL CONNECTION CONDITION)

(a) Check the connection of the AMD terminal (hybrid vehicle converter side).
Result:
The terminal is connected securely and there is no contact problem.
(b) Check for arc marks on the AMD terminals (hybrid vehicle converter side and vehicle wire harness side).
Result:
There are no arc marks.
NG -- REPLACE HYBRID VEHICLE CONVERTER
OK -- Continue to next step.
6. CHECK TERMINAL VOLTAGE (AMD TERMINAL)

(a) Turn the power switch off.
(b) Measure the voltage according to the value(s) in the table below when the power switch is off.
Standard voltage:

NG -- REPAIR OR REPLACE FRAME WIRE
OK -- Continue to next step.
7. CHECK HARNESS AND CONNECTOR (BATTERY PACK WIRE CONNECTOR)
(a) Disconnect the battery pack wire connector Components.

(b) Turn the power switch on (IG).

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
8. CHECK HYBRID VEHICLE CONTROL ECU
(a) Turn the power switch off.

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

NG -- CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - BATTERY PACK WIRE CONNECTOR)
OK -- Continue to next step.
9. CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONVERTER - BATTERY PACK WIRE CONNECTOR)
CAUTION: Be sure to wear insulated gloves.
(a) Turn the power switch off and remove the service plug grip L110 Hybrid Vehicle Control System.
NOTE: After removing the service plug grip, do not turn the power switch on (READY), unless instructed by the repair procedure because this may cause a malfunction.

(b) Check that the service plug grip is not installed.
(c) Disconnect connector N1 from the hybrid vehicle converter.

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

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
10. CHECK HYBRID VEHICLE CONTROL ECU
(a) Connect the all connectors.
(b) Turn the power switch on (IG).

NG -- REPLACE HYBRID VEHICLE CONVERTER
OK -- REPLACE HYBRID VEHICLE CONTROL ECU
11. CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - BATTERY PACK WIRE CONNECTOR)
(a) Turn the power switch off.

(b) Disconnect connector A54 from the hybrid vehicle control ECU.
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance (Check for open):

Standard resistance (Check for short):

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE HYBRID VEHICLE CONTROL ECU
12. CHECK FRAME WIRE (AUXILIARY BATTERY POSITIVE TERMINAL AND AMD TERMINAL)

(a) Turn the power switch off.
(b) Measure the voltage according to the value(s) in the table below.
Standard voltage:

NG -- CHECK AUXILIARY BATTERY
OK -- Continue to next step.
13. CHECK FUSIBLE LINK

(a) Check the fusible link (DC/DC) in the engine room R/B No. 1 and the fusible link (MAIN) that is installed at the auxiliary battery for improper installation and for open circuits.
Result:
They are connected securely. There are no open circuits in the fusible links.
NG -- REPLACE FUSIBLE LINK
OK -- Continue to next step.
14. CHECK HYBRID VEHICLE CONVERTER (AMD TERMINAL CONNECTION CONDITION)

(a) Turn the power switch off.
(b) Measure the voltage according to the value(s) in the table below when the power switch is off.
Standard voltage:

NG -- REPAIR OR REPLACE FRAME WIRE
OK -- REPLACE HYBRID VEHICLE CONVERTER
16. CHECK FUSE (IGCT NO. 3)

(a) Check the fuse (IGCT No. 3) in the engine room R/B No. 1 for improper installation and open circuit.
Result:
The fuse is installed securely. There is no open circuit in the fuse.
NG -- REPLACE FUSE (IGCT NO.3)
OK -- Continue to next step.
17. CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - BATTERY PACK WIRE CONNECTOR)
(a) Disconnect the battery pack wire connector Components.

(b) Turn the power switch on (IG).

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
18. CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONVERTER - BATTERY PACK WIRE CONNECTOR)
CAUTION: Be sure to wear insulated gloves.

(a) Check that the service plug grip is not installed.
(b) Disconnect connector N1 from the hybrid vehicle converter Components.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE HYBRID VEHICLE CONVERTER
19. CHECK FRAME WIRE (AUXILIARY BATTERY POSITIVE TERMINAL AND AMD TERMINAL)

(a) Turn the power switch off.
(b) Measure the voltage according to the value(s) in the table below.
Standard voltage:

NG -- CHECK AUXILIARY BATTERY
OK -- Continue to next step.
20. CHECK ENGINE ROOM R/B NO. 1 (FUSIBLE LINK AND FUSE)

(a) Check the fusible link (DC/DC) and the fuse (IGCT NO. 3) in the engine room R/B No. 1 and the fusible link (MAIN) that is installed at the auxiliary battery for improper installation and for open circuits.
Result:
They are connected securely. There are no open circuits in the fusible links or fuse.
NG -- REPLACE FUSE
OK -- Continue to next step.
21. CHECK HYBRID VEHICLE CONVERTER (AMD TERMINAL CONNECTION CONDITION)

(a) Turn the power switch off.
(b) Measure the voltage according to the value(s) in the table below when the power switch is off.
Standard voltage:

NG -- REPAIR OR REPLACE FRAME WIRE
OK -- Continue to next step.
23. CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - BATTERY PACK WIRE CONNECTOR)
(a) Disconnect the battery pack wire connector Components.

(b) Turn the power switch on (IG).

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
24. CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONVERTER - BATTERY PACK WIRE CONNECTOR)
CAUTION: Be sure to wear insulated gloves.

(a) Check that the service plug grip is not installed L110 Hybrid Vehicle Control System.
(b) Disconnect connector N1 from the hybrid vehicle converter.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE HYBRID VEHICLE CONVERTER
25. CHECK AUXILIARY BATTERY
(a) Check the connection of the auxiliary battery negative terminal.
Result:
The terminal is connected securely and there is no contact problem.
(b) Check for arc marks on the auxiliary battery negative terminal.
Result:
There are no arc marks.
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance:

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPAIR OR REPLACE FRAME WIRE