Viper V10-488 8.0L (1992)
This is an OPEN LOOP mode.
When the SFI system is ACTIVATED by the ignition switch, the following actions occur:
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The PCM reads atmospheric air pressure from the Manifold Absolute Pressure (MAP) sensor and calculates the basic fuel strategy.
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The PCM monitors the throttle position sensor and engine coolant temperature sensor input. The PCM uses these inputs to modify fuel
strategy.
When the key is turned to the ON position, neither the Auto Shutdown (ASD) relay or the fuel pump relay are ACTIVATED. For this reason,
battery voltage is not supplied to the ignition coil, fuel pump, injectors, oxygen sensor heater, or alternator field.
Wide Open Throttle
This is an OPEN LOOP mode.
During wide open throttle operation the PCM receives the following inputs:
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Engine coolant temperature (ECT) sensor
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Manifold absolute pressure (MAP) sensor
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Throttle position sensor (TPS)
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Crankshaft position (CKP) sensor
During wide open throttle conditions the following occurs:
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The PCM ignores the oxygen sensor input signal and adjusts injector pulse width, providing a predetermined amount of additional fuel.
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The PCM disengages the A/C compressor clutch through the clutch relay.
