1. Review section 0 2. Review 21, 22, 23(connector connections). 3. Ignition: OFF 4. Disconnect ETS/SPS control module (N47-2). 5. Connect socket box with test cable as per connection diagram (Figure 1). Electrical Wiring Diagrams: (location of grounds and connectors). Electrical Troubleshooting Manual, Model 163 (via WIS only).

Test Equipment; See MBUSA Standard Service Equipment Program

Description	Brand, model, etc.
Digital multimeter	Fluke models 23, 77 III, 83, 85, 87