ECM 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 J 39200 DMM.

Whenever you perform a ECM removal and replacement, follow the procedures.

The control module is designed to withstand normal current draws associated with vehicle operations. Avoid overloading any circuit. When testing for opens or shorts, do not ground or apply voltage to any of the control module circuits unless instructed to do so. Test these circuits by using the J 39200 DMM only.