1997 Ford Escort Base, StandardFACTORY OEM SERVICE PROCEDURE

Description & Operation

The module communications network provides the capability for module-to-module communication by sharing inputs and outputs instead of each component having an input and output wired directly to each module. A BUS which consists of a pair of twisted wires is used to transfer information between modules. The BUS consists of a (+) circuit No. 914 and a (-) circuit No. 915. The BUS is routed only to the Powertrain Control Module (PCM). For module locations, see COMPONENT LOCATIONS TABLE. In the event that a system failure exists, a Diagnostic Trouble Code (DTC) will be stored in the module. A New Generation Star (NGS) scan tester and Data Link Connector (DLC) may be used for retrieving and clearing DTCs from the modules. DTC may be used for system diagnosis.

NOTE: Terminal No. 7 (Orange wire) of the DLC goes directly to Remote Anti-Theft Personality (RAP) module and Anti-Lock Brake (ABS) module. This wire is referred to as the ISO 9141 communication link circuit No. 70 and provides a means for the scan tester to communicate with the Remote Anti-Theft Personality (RAP) module and Anti-Lock Brake (ABS) module by using the DLC.
COMPONENT LOCATIONS

Component Location
Anti-Lock Brake (ABS) Module Under Front Passenger's Seat
Data Link Connector (DLC) Below Driver's Side Of Instrument Panel, To Left Of Steering Column
Remote Anti-Theft Personality (RAP) Module (1)
Powertrain Control Module (PCM) Under Center Console
(1) On sedans, RAP module is behind right rear quarter panel. On station wagons, RAP module is behind left rear quarter panel.
Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.