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SVTPerformance's Chain of Restaurants
Tuning À la carte
idle rpm w/ ac on?
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<blockquote data-quote="Vinnie_B" data-source="post: 16816420" data-attributes="member: 201678"><p>*The alternator F terminal is a duty cycle signal that reflects field operation. <strong>The PCM monitors the F terminal to determine the alternator's load on the engine</strong>. The PCM uses this information to adjust engine RPM and alternator voltage set point.</p><p></p><p></p><p></p><p>Depends on how much load is being put on the charging system. So a simple test. Start by adding load on the charging system and observe a clamp on ampmeter on the alternator. Positive increments in amps indicate proper load requirements are being commanded by the PCM. </p><p></p><p></p><p>Procedure: To check alternator and load demand</p><p></p><p>After connecting an ammeter correctly in the battery circuit, continue as follows:</p><p></p><p></p><p>1. Start the engine and operate to about 2,000 RPM (fast idle).</p><p>2. Turn the heat selector to air-conditioning (if the vehicle is so equipped).</p><p>3. Turn the blower motor to high speed.</p><p>4. Turn the headlights on bright.</p><p>5. Turn on the rear defogger.</p><p>6. Turn on the windshield wipers.</p><p>7. Turn on any other accessories that may be used continuously (do not operate the horn, power door locks, or other units that are not used for more than a few seconds).</p><p></p><p>Observe the ammeter. The current indicated is the electrical load that the alternator is able to exceed to keep the battery fully charged.</p><p></p><p>Test Results</p><p>The minimum acceptable alternator output is 5 amperes greater than the accessory load. A negative (discharge) reading indicates that the alternator is not capable of supplying the current (amperes) that may be needed.</p></blockquote><p></p>
[QUOTE="Vinnie_B, post: 16816420, member: 201678"] *The alternator F terminal is a duty cycle signal that reflects field operation. [B]The PCM monitors the F terminal to determine the alternator's load on the engine[/B]. The PCM uses this information to adjust engine RPM and alternator voltage set point. Depends on how much load is being put on the charging system. So a simple test. Start by adding load on the charging system and observe a clamp on ampmeter on the alternator. Positive increments in amps indicate proper load requirements are being commanded by the PCM. Procedure: To check alternator and load demand After connecting an ammeter correctly in the battery circuit, continue as follows: 1. Start the engine and operate to about 2,000 RPM (fast idle). 2. Turn the heat selector to air-conditioning (if the vehicle is so equipped). 3. Turn the blower motor to high speed. 4. Turn the headlights on bright. 5. Turn on the rear defogger. 6. Turn on the windshield wipers. 7. Turn on any other accessories that may be used continuously (do not operate the horn, power door locks, or other units that are not used for more than a few seconds). Observe the ammeter. The current indicated is the electrical load that the alternator is able to exceed to keep the battery fully charged. Test Results The minimum acceptable alternator output is 5 amperes greater than the accessory load. A negative (discharge) reading indicates that the alternator is not capable of supplying the current (amperes) that may be needed. [/QUOTE]
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SVTPerformance's Chain of Restaurants
Tuning À la carte
idle rpm w/ ac on?
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