Features & Theory of Operation

Fuel Control
The GM Integrated Processor OBD II PN5929 controls alternate fuel delivery on air valve carburetion by monitoring the oxygen sensor, RPM, and injector signals. Those levels are used to modulate the reference pressure of the alternate fuel regulator through the Fuel Control Valve, (FCV). The Integrated Processor will maintain a stoichiometric air/ fuel ratio while still allowing the regulator to properly respond to high fuel demands at acceleration and high RPM. Maintaining fuel control significantly reduces emissions, improves fuel economy, and vehicle performance.

OEM Diagnostic Interface
The GM Integrated Processor OBD II PN5929 provides computer diagnostics for alternate fuel operation, while still preserving the OEM computer diagnostic abilities. The Integrated Processor interfaces with components related to fuel trim diagnostics such as gasoline injector control, oxygen sensor levels, manifold pressure, and serial data class II. These signals are monitored in order to maintain the appropriate parameters to prevent the OEM computer from sending false Diagnostic Trouble Codes (DTC), shifting the gasoline fuel map, and illuminating the Malfunction Indicator Lamp (MIL). In the event that any of these parameters deviate from proper operating range the Integrated Processor will signal the OEM computer to store the proper code and illuminate the MIL when actually necessary.

Timing Advance
The GM Integrated Processor OBD II PN5929 provides ignition timing advance by modifying the Manifold Absolute Pressure signal. Advancing the timing compensates for the higher octane, slower burning characteristics of alternate fuels. Timing advance improves alternate fuel engine performance, fuel mileage, and reduces the possibilities of backfires.

Idle Control
The GM Integrated Processor OBD II PN5929 maintains a correct idle setting fuel mixture through the Idle Control Solenoid (ICS). The ICS compliments the FCV by injecting air into the mixer at idle speeds. The ICS compensates for deterioration on the mixer air valve, regulator diaphragm, as durability of the system, as well as maintenance time intervals. The Integrated Processor also has the option to program the ICS for use on CNG applications.

Deceleration Control for LPG & CNG Conversions
The GM Integrated Processor OBD II PN5929 incorporates the Deceleration Control function. This feature turns off the alternate fuel electric lock off solenoid when the OEM computer shut off the injectors. Deceleration Control preserves the OEM safety functions and diagnostics for alternate fuel such as deceleration fuel control, governed speed control, and electronic throttle malfunctions. Deceleration control also helps reduce fuel consumption, exhaust backfire, and improves fuel control. Improving the fuel control further reduces the possibilities of a false DTC.

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