E 150 1/2 Ton Van V6-4.2L VIN 2 (1997)
Engine Control Module: Service Precautions
Electronic Component Replacement
1.
Before servicing electronic components, disconnect the battery ground.
NOTE: Before removing battery ground, access trouble codes. PCM memory will be erased if ground cable is removed.
2.
Fuel and Engine Control System wiring should be at least 4 inches away from ignition wires.