Re: ecm high voltage 89 camaro 2.8 mpfi
You might want to unplug the MAF connector and check continuity from the ECM connector to the MAF connector and to ground. Five volts goes out to semsor, any one of them, goes through the circuit, whatever it might be, and the return to ECM to tell ECM the condition is being sensed. There should be a minimal amount of voltage to chassis ground, and this difference should be seen on 5 volt reference voltage also. The ECM provides its own ground for the sensors. None get referenced to ground.
Also, check 5.0 volt at other sensor connectors to see if 5 volt regulator is broke or has a bad ground. Check all grounds in engine harness and ECm ground(s).
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