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EVC-164 < DTC/CIRCUIT DIAGNOSIS > P0AA1 SYSTEM MAIN RELAY + Since hybrid vehicles and electric vehicles contain a high voltage battery, there is the risk of electric shock, electric leakage, or similar accidents if the high voltage component and vehicle are handled incorrectly. Be sure to follow the correct work procedures when performing inspection and maintenance. WARNING: • Be sure to remove the service plug in order to disconnect the high voltage circuits before perform- ing inspection or maintenance of high voltage system harnesses and parts. • To prevent the removed service plug from being connected by mistake during the procedure, always carry it in your pocket or put it in the tool box. • Be sure to wear insulating protective equipment consisting of glove, shoes, face shield and glasses before beginning work on the high voltage system. • Clearly identify the persons responsible for high voltage work and ensure that other persons do not touch the vehicle. When not working, cover high voltage parts with an insulating cover sheet or sim- ilar item to prevent other persons from contacting them. • Refer to EVC-10, "High Voltage Precautions" CAUTION: • Never bring the vehicle into the READY status with the service plug removed unless otherwise instructed in the Service Manual. A malfunction may occur if this is not observed. • Erase DTC after the work is completed. 1. CHECK SYSTEM MAIN RELAY DRIVE POWER VOLTAGE 1. Turn power switch OFF. 2. Disconnect Li-ion battery harness connector. 3. Check the voltage between Li-ion battery harness connector and ground. Is the inspection result normal? YES >> GO TO 3. NO >> GO TO 2. 2. CHECK SYSTEM MAIN RELAY DRIVE CIRCUIT 1. Disconnect VCM harness connector. 2. Check harness for short to power, between Li-ion battery harness connector and VCM harness connector. Is the inspection result normal? YES >> Check intermittent incident. Refer to GI-53, "Intermittent Incident" . NO >> Repair or replace error-detected parts. 3. PRECONDITIONING WARNING: Disconnect high voltage. Refer to GI-33, "How to Disconnect High Voltage" Check voltage in high voltage circuit. (Check that condenser are discharged.) 1. Lift up the vehicle and remove the Li-ion battery under covers. Refer to Relay + − Voltage Li-ion battery Connector Terminal System main relay 1 B89 17 Ground 0 V System main relay 2 14 Pre-charge relay 11 + − Voltage Li-ion battery Connector Terminal B89 17 Ground 0 V 14 11 |