Diagnosis
INSPECT DIAGNOSISa. Check the auxiliary battery.
1. Measure the voltage of the auxiliary battery.
Voltage: 1O - 15V
2. Inspect the auxiliary battery, fuses, fusible links, wiring harness, connectors and ground.
b. Check the master warning light.
1. Turn the ignition switch ON and confirm that the master warning light comes on.
HINT: If the master warning light does not come on, suspect a burnt fuse, burnt bulb, or open in wiring harness.
2. When the "READY" light is ON, the master warning light should go off.
If the lamp remains on, the diagnosis system has detected a malfunction or abnormality in the system.
c. Check the DTC.
1. Prepare a TOYOTA hand-held tester.
2. Connect the TOYOTA hand-held tester to the DLC3.
3. Turn the ignition switch ON and push the TOYOTA hand-held tester main switch ON.
4. Use the TOYOTA hand-held tester to check the DTC and freeze frame data and note them down. (For operating instructions, see the TOYOTA hand-held tester operator's manual).
Since the HV battery ECU stores DTC and freeze frame data, when troubleshooting, check all of the DTC, write down the freeze fame data and perform inspection according to the procedures of "Circuit Inspection".
Because the HV battery ECU is communicating with the HV ECU, if any DTC is stored in the HV battery ECU, check and record DTC stored in the HV ECU.
5. See Trouble Code Descriptions to confirm details of the DTC.
d. Clear DTC after completion of repair.
1. Connect the TOYOTA hand-held tester to the DLC3.
HINT: Before clearing, check that DTC for the HV battery ECU, DTC for the ECU which is related with freeze frame data and the freeze frame data are recorded.
2. Operate the TOYOTA hand-held tester to erase the DTC (See the TOYOTA hand-held tester operator's manual.).