Diagnosis System
P112 HYBRID BATTERY CONTROL: HYBRID BATTERY SYSTEM: DIAGNOSIS SYSTEM
DIAGNOSIS SYSTEM
1. DESCRIPTION
- The battery ECU has a self-diagnosis system. If the computer, HV battery system or the components are not working properly, the ECU carries out a diagnosis to detect the malfunction, and illuminates the master warning light in the combination meter together with the HV system warning indicator on the multi-information display.
HINT: The master warning light illuminates when the HV battery system fails and it blinks when in inspection mode.
- When troubleshooting OBD II vehicles, the only difference from the usual troubleshooting procedure is that you need to connect the OBD II scan tool (complying with ISO 15031-4) or the Techstream to the vehicle, and read various data output from the vehicle's ECUs.
- OBD II regulations require that the vehicle's on-board computer illuminate the MIL in the instrument panel when the computer detects a malfunction in: 1) the emission control systems/components, or 2) the powertrain control components (which affect vehicle emissions), or 3) the computers. In addition, the applicable Diagnostic Trouble Codes (DTCs) prescribed by SAE J2012 are recorded in the battery ECU memory Hybrid Battery System.
- If the malfunction does not recur in 3 consecutive trips, the MIL will turn off automatically. However the DTCs remain recorded in the battery ECU memory.
- To check the DTCs, connect the Techstream to the Data Link Connector 3 (DLC3). Or, connect the OBD II scan tool to the DLC3. The Techstream or OBD II scan tool also enables you to erase DTCs and check the freeze frame data and various forms of the HV battery system data (for operating instructions, refer to their respective instruction manuals). The DTCs include SAE controlled codes and manufacturer controlled codes. SAE controlled codes must be set as prescribed by the SAE, while manufacturer controlled codes can be set by a manufacturer within the prescribed limits Hybrid Battery System.
- Freeze frame data:
The freeze frame data records the driving condition when a malfunction is detected. When troubleshooting, it can help determine if the vehicle was moving forward, braking, stationary, or moving in reverse.
2. CHECK DLC3
The battery ECU uses the ISO 15765-4. The terminal arrangement of the DLC3 complies with ISO 15031-3 and matches the ISO 15765-4 format.
HINT: *: Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the ignition switch, other switches or doors.
If the result is not as specified, the DLC3 may have a malfunction. Repair or replace the harness and connector.
HINT: Connect the cable of the Techstream or the OBD II scan tool to the DLC3, turn the power switch ON (IG) and attempt to use the tester. If the display indicates that a communication error has occurred, there is a problem either with the vehicle or with the tester.
- If communication is normal when the tester or scan tool is connected to another vehicle, inspect the DLC3 on the original vehicle.
- If communication is still not possible when the tester or scan tool is connected to another vehicle, the problem is probably in the tester or scan tool itself, so consult the Service Department listed in its instruction manual.
3. INSPECT AUXILIARY BATTERY
(a) Measure the voltage of the auxiliary battery.
Standard voltage:
11 to 14 V
(b) Inspect the auxiliary battery, fuses, fusible links, wiring harness, connectors and ground.
4. CHECK MIL
(a) The MIL illuminates when the power switch is turned ON (IG) and the "READY" light is OFF.
If the MIL is not illuminated, troubleshoot the MIL circuit MIL Circuit.
(b) When the "READY" light turns illuminated, the MIL should turn off.
If the MIL remains on, the diagnosis system has detected a malfunction or abnormality in the system.