Section 2 (BCM System, Part I): Identification

WARNING: This page is about a different car, the 1986 Oldsmobile Toronado and 1986 Buick Riviera. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: ECM Terminal Identification

The following conditions must be met before testing:

Engine at operating temperature.
Engine in closed loop operation.
Engine idling ("Engine Run" column).
Test terminal NOT grounded.
Scanner NOT installed.
A/C off.