• The PCM sends a Vref of 5.0 volts to four engine mounted sensors: ICP, EP, EGRVP, and EGRTP. It also sends a 5.0 volt reference signal to four chassis mounted sensors: MAF, BP, MAP, and AP.
• The PCM uses 5 volts in order to maintain consistency throughout all operating conditions.
• The Vref is conditioned by the sensors then returned to the PCM for use in determining the fueling strategy and/or actuator duty cycle.
• The EGRTP (Exhaust Gas Recirculation Throttle Position) Sensor is added.
• IAT1 is not used in any engine control. The IAT1 signal is used to assist in the operation of the air conditioning and engine cooling fan.
• MAF is not used in any engine control. MAF is used in the EGR monitor strategy to calculate the total clean air going into the engine. Once the total clean air is known, the amount of EGR required can be calculated.
• NOTE: Failure in either or both of these components has no effect on engine performance.
