INJECTOR DRIVER MODULE (IDM) OPERATION [MZR-CD (RF Turbo)]
BME014018701T03
• The IDM amplifies the battery positive voltage input from the PCM control relay into high voltage of more than approximately 50 V via the high voltage generating circuit, and outputs it to the fuel injectors as a fuel injector drive signal.
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1
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IDM
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2
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High voltage generator
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3
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Control circuit
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4
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Battery positive voltage (from PCM control relay)
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5
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Injection signal No.1 (from PCM)
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6
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Injection signal No.4 (from PCM)
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7
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Injection signal No.2 (from PCM)
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8
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Injection signal No.3 (from PCM)
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9
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Injection confirmation signal (to PCM)
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10
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Fuel injector No.1
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11
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Fuel injector No.4
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12
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Fuel injector No.2
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13
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Fuel injector No.3
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• When fuel injection signals are input from the PCM to the IDM, the IDM drives the fuel injectors at high voltage and starts injector operation for a short interval. When the fuel injectors start operating, the IDM maintains a constant current.
• While the fuel injectors are operating, the IDM detects the fuel injector drive current and outputs fuel injection confirmation signals (injector operating status) to the PCM.
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1
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Injection confirmation signal (to PCM)
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2
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Injection signal (from PCM)
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3
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Fuel injector drive current
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4
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Holding current switching time
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5
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Holding current control value
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6
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Fail signal (High side)
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7
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Fail signal (Low side)
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