Displaying & Reading Trouble Codes
NOTE: This is the only information provided by the manufacturer for reading Diagnostic Trouble Codes for this system.PRE-CHECK
1. PRECAUTION
a. To distinguish a trouble and replace a defective part, take necessary preventive measures against an electric shock.
b. Some portions of the wiring harness in the THS vehicle have the circuits, to which a high voltage is applied. To prevent an electrical shock, be sure to observe the following:
1. Wear insulated gloves during inspection.
2. Remove a service plug and do not start any repair operation before 5 minutes have passed, then confirm that the voltage at the output terminals has dropped down to 12 V or less.
3. Use insulated tools during inspection.
4. When disengaging wiring connectors, hold the connector bodies to avoid pulling the wires. When engaging wiring connectors, be sure to engage them securely.
c. Do not leave tools or parts (bolts, nuts, etc.) inside the cabin.
d. Do not carry metallic objects such as mechanical pencils or scales.
2. DIAGNOSIS SYSTEM
a. Description
- The HV Battery ECU has a self-diagnosis system by which malfunction in the computer itself or in Hybrid System is detected and the master warning light in the combination meter and the Hybrid system warning light in the multi-information display lights up.
- To check the Diagnostic Trouble Codes (DTC), connect the TOYOTA hand-held tester to the Data Link Connector 3 (DLC3) on the vehicle. The TOYOTA hand-held tester also enables you to erase the DTC and check freeze frame data and various forms of THS data.
- Freeze frame data:
Freeze frame data records the battery condition when a malfunction is detected.
When troubleshooting, this is useful for knowing the battery condition
b. Check the DLC3.
The HV control ECU conforms to ISO 14230 for communication.
The terminal arrangement of the DLC3 complies with SAE J1962 and matches the ISO 14230 format.
HINT: If your display shows UNABLE TO CONNECT TO VEHICLE when you have connected the cable of the TOYOTA hand-held tester to the DLC3, turned the motor switch ON and operated the tester, there is a problem in the vehicle or tool.
- If communication is normal when the tool is connected to another vehicle, inspect the DLC3 on the original vehicle.
- If communication is still not possible when the tool is connected to another vehicle, the problem is probably in the tool itself, so consult the Service Department.
3. INSPECT DIAGNOSIS
a. Check the auxiliary battery.
1. Measure the voltage of the auxiliary battery.
Voltage: 10 - 15 V
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 arid freeze frame data, when troubleshooting, check all of the DTC, write down the freeze fame data arid 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 a related 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.).
4. CHECK FOR INTERMITTENT PROBLEMS
a. Perform a simulation test.
HINT: In the simulation test, reproduce the condition at trouble occurrence based on the customer's comments and the freeze frame data recorded with the DTC.
b. Check the connector and terminal.
c. Handle the connector.
Part 1:
Part 2:
5. TOYOTA HAND-HELD TESTER DISPLAY ITEMS