Main relay, engine management system (229), Simtec
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Main relay, engine management system (229), Simtec
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Main relay, engine control system (229)
The relay supplies the oxygen sensors and the mass air flow sensor.
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Pin No.
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Signal type
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Description
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30
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Power supply, +30
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Relay switch's power supply from fuse 1 (342).
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85
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Control
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Relay coil's control. Grounded by ECM pin 36(B) to activate the main relay.
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86
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Power supply, +30
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Relay switch's power supply from fuse 1 (342).
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87
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Output, B+
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Relay switch's output.
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When the ignition is switched "ON", ECM pin 36 (B) grounds and the main relay pulls. The oxygen sensors and the mass air flow sensor receive supply voltage from main relay pin 87.
