Module Identification
Module identification modules on this multiplex communication network are:
- Powertrain Control Module (PCM): The powertrain control module (PCM) is located in the engine compartment on the passenger side of the vehicle on the bulk head. The powertrain control module communicates on the Tan/Orange wire and the Pink/Light Blue wire. A failure of these circuits may result in a no start condition. In order to properly service the vehicle it is necessary to perform a network communications check. This check is automatically performed by the New Generation Star (NGS) Tester for 1996. In the event New Generation Star Tester fails to communicate with the powertrain control module refer to communication systems diagnostics. See NEW GENERATION STAR (NGS) TESTER USAGE under SELF-DIAGNOSTIC SYSTEM.
- Electronic Automatic Temperature Control (EATC): The Electronic Automatic Temperature Control (EATC) module is located on the evaporator case in the passenger compartment on the passenger side of the vehicle. The EATC and PCM share information across the vehicle communications link on the Tan/Orange wire and the Pink/Light Blue wire. A failure of the Tan/Orange and Pink/Light Blue wires may result in degraded automatic temperature control during warm up. The EATC provides diagnostic service to the New Generation Star (NGS) Tester through the Tan/Orange and Pink/Light Blue wires. A failure to communicate with the EATC will result in a failure in the network communications test performed by the New Generation Star Tester. In the event the network communications tests fails, diagnose be symptom. See SYMPTOM INDEX table under SYSTEM TESTS. Off-board tester communication with these modules is carried out through the data link connector, which is located under the instrument panel to the right of the steering column. For more details refer to Network Circuit Layouts. See Fig 2 .