Hatchback 4WD F4-1781cc 1.8L (1983)
Parking Brake Warning Lamp: Diagnostic Aids
Battery Precautions
CAUTION:
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Never use a booster/starter which has a voltage rating above 12 volts to start engine.
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Always ensure the battery is properly connected to the vehicle prior to attempting to start engine.
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Don't disconnect the battery when the engine is running.
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When charging a battery, be sure battery cables are disconnected.
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The battery contains acid and produces explosive gas (hydrogen). Avoid creating sparks near battery.
Electrical Connections and Circuits
CAUTION:
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Prior to disconnecting, fully release connector locks.
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Ensure connectors are fully seated and all insulators and shields are in place when installed.
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Never connect or disconnect electrical connections with the ignition switch ON, unless directed to do so by a test procedure.
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Do not test continuity with a self powered test lamp.
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Avoid arcing when checking circuit continuity.
Electronic Component Handling
STATIC DISCHARGE
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Before handling electronic parts discharge static charges by touching ground or maintaining a ground connection to a bare skin area.
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Never touch control unit connector pins, integrated circuit connector pins, or soldered components on the control unit circuit board.
TESTING
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When measuring voltage at the control unit harness connector disconnect harness connector with the ignition OFF then turn ignition ON as
necessary.
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To prevent deforming control unit harness connectors do not probe terminals directly. Instead insert a pin from the harness side and perform
measurements through pin.
CONTROL UNIT DAMAGE
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Do not try to disassemble the control unit.
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Before performing electrical welding disconnect the battery, climate control, injection, cruise control, control unit, and radio.
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If temperatures may exceed 176°F (80°C) remove all control units.
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Avoid getting water on any fuel and engine control system components.
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Never apply battery power to a component unless directed to do so in a test procedure.
Electronic Component Replacement
NOTE: Before disconnecting battery ground, access trouble codes and radio presets. Control unit memory is erased when ground is removed.
CAUTION:
^
Disconnect battery ground before servicing electronic components.
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To avoid induced voltage spikes, all fuel and engine control system wiring should be at least 4 inches away from ignition wires.
Electrostatic Discharge
ELECTROSTATIC DISCHARGE DAMAGE
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Automotive computers and related component operate at low voltages (3 to 5 V) and are extremely susceptible to damage from static electrical
discharge.
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Voltages as low as 12V can damage electronic circuits. For a person to feel a static discharge "ZAP," it takes up to 4,000V.
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There is no way to know whether the charge is positive or negative.
COMMON METHODS OF STATIC CHARGING
Friction
Friction between organic materials (such as cotton or leather) and synthetics (such as plastic, vinyl, or glass) will generate static charges as great as
25,000 volts. This can happen by simply sliding across a car seat or by wearing a cotton shirt under a coat made of synthetic materials.
Induction
Charging by induction occurs when a person standing near a highly charged object (strong magnetic field such as a transformer) momentarily
touches ground. Like charges are displaced to ground, leaving the person highly charged with opposite polarity.
STATIC PRECAUTIONS
Static charges are gradually equalized by moisture in the air, but are retained much longer when humidity is low. Use care when handling and
