P0AE7

HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM: P0AE7-224: Hybrid Battery Precharge Contactor Control Circuit High
P0AE7-224 - Hybrid Battery Precharge Contactor Control Circuit High

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 hybrid battery junction block 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 the 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.





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

PROCEDURE

1. CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - HYBRID VEHICLE CONVERTER)

CAUTION:
Be sure to wear insulated gloves.

(a) 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.

(b) Disconnect connector z17 from the hybrid vehicle converter.

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

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





Standard Voltage:





Text in Illustration





NOTICE:
Turning the power switch on (IG) with the hybrid vehicle converter connector disconnected causes other DTCs to be stored. Clear the DTCs after performing this inspection.

(e) Turn the power switch off.

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

Standard Resistance:





(g) Connect the hybrid vehicle converter connector.

NG -- CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - HYBRID VEHICLE CONVERTER)

OK -- REPLACE HYBRID VEHICLE CONVERTER Components

2. CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - HYBRID VEHICLE CONVERTER)

(a) Disconnect connector A58 from the hybrid vehicle control ECU.

(b) Disconnect connector z17 from the hybrid vehicle converter.

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

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





Standard Voltage:





Text in Illustration





NOTICE:
Turning the power switch on (IG) with the hybrid vehicle converter connector disconnected causes other DTCs to be stored. Clear the DTCs after performing this inspection.

(e) Turn the power switch off.

(f) Connect the hybrid vehicle converter connector.

(g) Connect the hybrid vehicle control ECU.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE HYBRID VEHICLE CONTROL ECU Components