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LEMON is the spiritual successor to CHARM, I recommend you try it!
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System Inspection
Engine Control(SULEV)P0606 ECM/PCM Processor - Inspection/Repair:_:System InspectionSystem InspectionBack-Up Voltage Inspection 1.
Ignition "OFF"
2.
Disconnect PCM connector.
3.
Ignition "ON"
4.
Measure voltage between terminal 6 of the PCM harness connector and chassis ground
Specification :Remain stable at battery voltage 5.
Are circuits remaining stable at battery voltage?