WARNING: This page is about a different car, the 1995 Dodge Ram Wagon, 1995 Dodge Ram Van, 1995 Dodge Pickup, and 1995 Dodge Dakota. However, it is still accessible from the selected car via links, so may be relevant.

PCM is a digital computer that controls ignition timing, air/fuel ratio, emission control devices, cooling fan, charging system, idle speed, cruise control (if equipped), fuel pump and tachometer. The control unit is located in engine compartment. PCM uses data from various input sources to control output devices in order to achieve optimum engine performance for all operating conditions.

PCM has voltage converters that convert battery voltage to regulated 5-volt and 8-volt outputs. The 8-volt output powers vehicle speed sensor, Camshaft Position (CMP) sensor and Crankshaft Position (CKP) sensor. The 5-volt output powers coolant temperature sensor, throttle body temperature sensor, Manifold Absolute Pressure (MAP) sensor and Throttle Position Sensor (TPS).

NOTE: Components are grouped into 2 categories. The first category, INPUT DEVICES, includes components that control or produce voltage signals monitored by the PCM. The second category, OUTPUT SIGNALS, includes components controlled by the PCM (this is accomplished by the PCM grounding individual circuits).

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.

Safety Warning

Powertrain Control Module (Pcm)

Use the Manual With the Right Hardware

When to See a Mechanic

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