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CONTROL SYSTEM 09–40–5 09–40 On-Board Diagnostic Function • The on-board diagnostic function is incorporated into the following module: — PCM — TCM — DSC HU/CM (with DSC) — ABS HU/CM (with ABS) — Keyless control module — Steering angle sensor — Instrument cluster • This function can narrow down CAN system malfunction locations. • The on-board diagnostic function consists of the following functions. — Failure detection function, which detects DTCs malfunctions in CAN system-related parts. — Memory function, which stores detected. — Self-malfunction diagnostic function, which indicates system malfunctions using DTCs and warning lights. • Using the WDS or equivalent, DTCs can be read out and deleted. • The CAN system has a fail-safe function. When a malfunction occurs in CAN system, the transmission module sends a warning signal and the receiving module illuminates the warning light. Block diagram Failure detection function • The failure detection function in each CAN system-related module detects malfunctions in input/output signals. • This function outputs the DTC for the detected malfunction to the DLC-2, and also sends the detected result to the memory function and fail-safe function. Fail-safe function • When the failure detection function determines that there is a malfunction, the fail-safe function illuminates a warning light to inform the driver of the malfunction. Memory function • The memory function stores the DTC for the malfunction of input/output signals for related parts, as determined by the failure detection function. Self-malfunction diagnostic function • The self-malfunction diagnostic function determines that there is a malfunction, and outputs a signal, as a DTC, to the DLC-2. The DTC can be read out using the WDS or equivalent. F E Z Y 1J 1L : : CAN_H CAN_L DLC-2 1AI 1AM 4AA 4Z 1G 1C PCM ABS HU/CM KEYLESS TCM (AT) INSTRUMENT TWISTED PAIR X W DSC HU/CM E F STEERING E5U940ZS5002 |