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Home >> Toyota >> 2007 >> Camry CE, Automatic >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 64 (P311 Hybrid Vehicle Control - Control System Diagnostic & Troubleshooting Introduction, Precautions, Parts Location, System Description, Terminals Of Ecu, Diagnostic Trouble Code Chart) >> Hybrid Control System >> Diagnosis System
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Diagnosis System

WARNING: This page is about a different variant/trim than selected.
  1. DESCRIPTION 
    1. The hybrid vehicle control ECU has a self-diagnosis system. If the computer, hybrid vehicle control system, or a component is not working properly, the ECU records the conditions that relate to the fault. The ECU also illuminates the master warning light and/or MIL in the combination meter and displays warning messages on the multi-information display.
      Fig 1: Identifying DLC3 Connector Terminals
      G05009409Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Fig 2: Combination Meter Display
      G05009410Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      HINT:

      The master warning light will illuminate when the THS II fails and the light will blink when in inspection mode.

      • When troubleshooting OBD II vehicles, it is necessary to connect an OBD II scan tool that complies with SAE J1978 or connect an intelligent tester to the vehicle. Using one of these testers, it will be possible to read various data output from the vehicle's ECUs.
      • OBD II regulations require that the vehicle's on board computer illuminates the Malfunction Indicator light (MIL) in the instrument panel when the computer detects a malfunction in (1) the emission control system/components, (2) the powertrain control components (which affect vehicle emissions), (3) the hybrid vehicle control ECU. In addition, applicable Diagnostic Trouble Codes (DTCs) prescribed by SAE J2012 are recorded in the hybrid vehicle control ECU memory (See DATA LIST / ACTIVE TEST  ).

        If a malfunction does not recur in 3 consecutive trips, the MIL will go off automatically. However the DTCs will remain recorded in the hybrid vehicle control ECU memory.

      • To check for DTCs, connect the intelligent tester to the Data Link Connector 3 (DLC3) with the CAN vehicle interface module (CAN VIM). The intelligent tester also allows erasing of DTCs, viewing of freeze frame data, and viewing of various forms of THS II data (for operating instructions, refer to the tester's instruction manual). 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 the manufacturer within prescribed limits (See DATA LIST / ACTIVE TEST  ).
  2. CHECK DLC3 
    1. The hybrid vehicle control ECU uses the ISO 9141-2 communication protocol. The terminal arrangement of the DLC3 complies with SAE J1962 and matches the ISO 9141-2 format.
      Fig 3: Connecting Intelligent Tester To Data Link Connector 3
      G04977982Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TERMINAL DESCRIPTION AND SYMBOL REFERENCE

      Symbol Terminal No. Name Reference Terminal Result Condition
      SIL 7 Bus "+" line 5 - Signal ground Pulse generation Always
      CG 4 Chassis ground Body ground 1 Ω or less Always
      SG 5 Signal ground Body ground 1 Ω or less Always
      BATT 16 Battery positive Body ground 11 to 14 V Power switch off
      CANH 6 HIGH-level CAN bus line 14 - LOW-level CAN bus line 54 to 69 Ω Power switch off
      CANH 6 HIGH-level CAN bus line 14- Battery positive 1 MΩ or higher Power switch off
      CANH 6 HIGH-level CAN bus line 4 - Chassis ground 1 kΩ or higher Power switch off
      CANL 14 LOW-level CAN bus line 16- Battery positive 1 MΩ or higher Power switch off
      CANL 14 LOW-level CAN bus line 4 - Chassis ground 1 kΩ or higher Power switch off

      HINT:

      Connect the cable of the intelligent tester to the DLC3, turn the power switch on (IG), and attempt to use the tester. If the display on the tester indicates that a communication error has occurred, there is a problem either with the vehicle or with the tester.

      • If the tester is able to communicate when it is connected to another vehicle, inspect the DLC3 connector of the original vehicle.
      • If communication is still not possible when the tester is connected to another vehicle, the problem is probably in the tester itself. Consult the tester's instruction manual for information on service or repair of the tester.
  3. INSPECT AUXILIARY BATTERY 
    1. Measure the voltage of the auxiliary battery.

      Standard Voltage: 

      10 to 14 V 

    2. Inspect the auxiliary battery, fuses, fusible links, wiring harness, connectors and ground.
  4. CHECK MIL 
    1. The MIL will illuminate when the power switch is turned on (IG), before the "READY" light comes on. If the MIL does not illuminate, troubleshoot the MIL CIRCUIT (2006/03-2006/10) .
    2. When the "READY" light turns on, the MIL should turn off. If the MIL remains on, the diagnosis system has detected a malfunction or abnormality in the system.
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