Circuit/System Description
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The engine control module (ECM) has a 5 V reference buss for each 5 V reference circuit. The circuits are called 5 V reference 1 and 5 V reference 2. Each bus provides a 5 V reference for more than one sensor. A fault condition on one 5 V reference circuit will affect the other 5 V reference circuits connected to that reference bus. The ECM monitors the voltage on the 5 V reference circuits.