When Monitored

WARNING: This page is about a different car, the 2024 Jeep Grand Wagoneer L and 2024 Jeep Grand Wagoneer. However, it is still accessible from the selected car via links, so may be relevant.

At initial engine start up, the PCM runs a Fuel Pressure Sensor rationality check. For approximately the first 10.0 seconds, the fuel pressure is dynamic. At this time, It will spike above the set point (approximately 5.8-7.25 psi), then drop below the set point (approximately 8.7-10.2 psi), and quickly dampen and settle at the set point. At initial engine start up, when the engine speed reaches approximately 500 rpm, the Powertrain Control Module (PCM) measures the delta pressure change between the high pressure reading and low pressure reading.