Catera V6-3.0L VIN R (1997)
Engine Control Module: Service Precautions
The ECM, by design, can withstand the normal current draws that are associated with the vehicle operations. However, care must be used in order to
avoid overloading any of these circuits. When testing for opens or shorts, do not ground or apply voltage to any of the ECM circuits unless the diagnostic
procedure instructs you to do so. These circuits should only be tested with a Digital Voltmeter (special tool number J 39200).