Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Description & Operation: Notes
Vehicle may use 2 module communications networks. The Powertrain Control Module (PCM) is connected to the multiplex communications network through a pair of twisted wires or BUS. The BUS consists of a + circuit and a - circuit (circuit No. 914 and 915 respectively).
On Ranger, the air bag diagnostic monitor and all other optional modules, the Generic Electronic Module (GEM), Remote Anti-Theft Personality (RAP) module and Anti-Lock Brake System (ABS) module, are connected to the ISO 9141 diagnostic communications network through a single wire (circuit No. 70). Both networks are connected to the Data Link Connector (DLC).
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 module. DTC may be used for system diagnosis.
| Component | Location | |
|---|---|---|
| Aerostar | ||
| Data Link Connector (DLC) | Below Center Of Instrument Panel | |
| Powertrain Control Module (PCM) | Left Side Of Firewall, Near Brake Master Cylinder | |
| Ranger | ||
| Air Bag Diagnostic Monitor | Behind Instrument Panel On Passenger's Side | |
| Anti-Lock Brake Module | Left Side Of Engine Compartment | |
| Data Link Connector (DLC) | Below Driver's Side Of Instrument Panel,To Right Of Steering Column | |
| Generic Electronic Module (GEM) | Behind Center Of Instrument Panel | |
| Remote Anti-Theft Personality (RAP) Module | Left Rear Corner Of Cab | |
| Powertrain Control Module (PCM) | Mounted Through Firewall, On Passenger's Side | |
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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.
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