- Pressure Regulator Spring
- Wiring Harness with Connectors
Line PressureBooster KitPart No.RFE-LB1• Wiring Harness with Connectors• Pressure Regulator SpringPatent No. 8,275,530Locked UnlockedFigure 268RFEPump BodyPressureRegulatorSpringWiringHarness withConnectorsCAUTION: Make sure the key is removed from ignition and beware of hot exhaust.1. Harness InstallationDisassemblya. Remove harness connector from the transmission sensor by using a flat blade screwdriver orsimilar tool to gently back out the red locking tab about 1/4″ (Figures 1 & 2).b. Depress inner black locking tab while carefully removing connector from the sensor.NOTE: Do NOT pull directly on the harness wires or damage may result.Assemblya. Connect vehicle harness to Sonnax line pressure booster, then push in the red locking tab. Attachother booster connector to transmission sensor connector and push in the red locking tab.b. Inspect and verify harness is safely routed away from hot exhaust and sharp edges.c. Using capable scan tool, perform the clutch volume index (CVI) reset procedure so thecontrol unit can adapt to the new pressure.d. If no scanner is available, test drive at light-to-medium throttle through several shifts so thecontrol unit can adapt to the new pressure.2. Pressure Regulator Spring InstallationNOTE: Pressure regulator spring is optional, see page 2, item 3 for details.a. Remove transmission. Remove and disassemble pump.b. Remove and discard OE pressure regulator spring.c. Install Sonnax spring. Reassemble and reinstall transmission.CAUTION©2016 Sonnax Industries, Inc. RFE-LB1-IN
Achieving a Progressive Pressure Boost in RFEs: Chrysler 45RFE, 545RFE, 65RFE, 66RFE & 68RFE1. Compared to other common transmissions, what is different about the RFE pressure control system?RFE units have a full range pressure transducer and real-time adaptive closed-loop pressure control system. This system is unique to theChrysler RFE transmissions. Because of this, it is not possible to raise pressure in an RFE the same way you would in other transmissions.Installing a stronger pressure regulator spring or larger boost valve will not be effective because the RFE control module will simply adaptand return pressure to OE specification. An electrical booster option is necessary to raise pressure on an RFE.2. What are the differences between the Sonnax RFE-LB1 kit compared to old 44957-LB1 & -LB2 kits?The previous Sonnax RFE Line Boosters had two versions, 44957-LB1 (diesel) and 44957-LB2 (gas).In diesel applications the Pressure Control Solenoid (PCS) duty cycle is closer to the 5% operational low-limit and pressure is generallyhigher than gas applications. As a consequence the 44957-LB1 (diesel) increased pressure less than the 44957-LB2 (gas). In rare instancesa low pressure trouble code P0868 could set due to higher adapted pressures, or higher than typical system voltage. Higher system voltageincreases current (amperage) to the PCS solenoid, causing a further reduction in PCS duty cycle as the system tries to adjust pressure. TheP0868 low pressure code sets when PCS duty cycle tries to exceed the 5% operational low-limit. The RFE-LB1 is an improved design withan integrated chip (IC) circuit and a stronger pressure regulator spring. The improved design has three benefits over the 44957-LB1 and44957-LB2:a. A progressive pressure increase (approximately 10 psi) at lower pressure ranges and a greater increase (approximately 25 psi) athigher pressure ranges.b. Greater sensor voltage range compared to old design reduces potential for trouble codes.c. One kit can be used in both gas and diesel applications.3. What results can be expected when the RFE-LB1 is installed?Like the old 44957-LB1 and 44957-LB2, this Sonnax RFE-LB1 can be installed with just the harness, without installing the includedstronger pressure regulator spring. With this scenario, pressure will increase as described. To achieve the pressure increase, the computerlowers the PCS duty cycle operational range. In rare cases, vehicles with higher system voltages or high commanded pressures may settrouble codes as the PCS duty cycle reaches the limit of its operational range. In the rare instance this occurs, the only option is to eitherremove the Line Booster harness or install the pressure regulator spring. If the Line Booster kit is being installed when the transmissionis removed from the vehicle, simply install the stronger pressure regulator spring in the pump, and the harness when the transmission isreinstalled. With this scenario, pressure will be increased as described, however because of the new spring load, the system will make thehigher pressure while the PCS duty cycle operating range remains close to original (reference chart below).Scenario CommentsLine Pressure(as measured with gaugeand Mopar adaptor 8259)PCS Duty Cycle Operational Range(OE limits are 5% & 62%) Trouble Codes1.RFE-LB1Harness &SpringBest combinationwhen transmissionis removed fromvehicle.Increases progressivelyfrom 10 psi to 25 psiincrease athigher pressure ranges.PCS operational range remains close to original5%…………( PCS Op Range )…………62% Unlikely to occur.2.RFE-LB1HarnessOnlyBest option whentransmission isNOT removed fromvehicle.Increases progressivelyfrom 10 psi to 25 psiincrease athigher pressure ranges.PCS operational range is lowered5%…( PCS Op Range )…………………62%In rare cases P0868 can occur as thePCS duty cycle reaches the limit of itsoperational range in vehicles with programmersinstalled, with higher systemvoltages or commanded pressures.3.RFE-LB1Spring OnlyNot recommendedNo benefitsNo concernsNo pressure increase.PCS operational range is raised5%…………………( PCS Op Range )…62%Unlikely to occur.
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