Preliminary work: Diagnosis - Diagnostic Trouble Code (DTC) Memory 12

Preparation for Test: 1. Fuses OK. 2. Battery voltage >11 V. 3. Install model specific HHT module into HHT. 4. Connect Hand-Held Tester (HHT) to 38-pole data link connector (X11/4) according to connection diagram shown in section 0. Electrical wiring diagrams : Electrical Troubleshooting Manual, Model 129, Volume 2, group 80, Model 140, Volume 2, group 80, Model 202, Volume 2, group 80, Model 210, Volume 2, group 80.

Conventional tools, test equipment

Description	Brand, model, etc.
Multimeter 1)	Fluke models 23, 83, 85, 87

1) Available through the MBUSA Standard Equipment Program.