Chrysler RAM50/D50/Arrow 1979-1993 Repair Guide

Evaporative Emission Purge Solenoid

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OPERATION



See Figure 1

While the 2.0L and 2.6L engines use a vacuum actuated Evaporative Emission Purge (EEP) solenoid, the 2.4L and 3.0L engines use an electrically controlled EEP solenoid. The EEP solenoid is an ON/OFF type of solenoid valve. It regulates the introduction of purge air from the evaporative emission canister to the intake air plenum.

The EEP solenoid is powered by the battery, which is channeled through the MFI relay. When the ECM switches the ignition power transistor within the unit, current floes to the coil and purge air is allowed to enter the manifold.

This solenoid is located on the left-hand side of the engine compartment, and is integral with the EGR solenoid.



Click image to see an enlarged view

Fig. Fig. 1: The location of the EEP solenoid-all models similar

HARNESS TESTING



2.4L Engines

See Figure 2

The 1993, rear-wheel drive 2.4L (California) Pick-ups have the same engine controls as the 3.0L engines. All other 2.4L engines are listed as 2.4L engines.

  1. Unplug the harness connector to the EEP solenoid and turn the ignition switch ON . Measure the power supply voltage from the EEP solenoid harness connector terminal 2 to a ground. If the voltage is not the same as the battery's (around 10-12 volts) repair the harness between EEP solenoid terminal 2 and the MFI relay.
  2.  
  3. Unplug the ECM harness connector and check for an open or short-circuit to ground, between EEP solenoid terminal 1 and the ECM terminal 62. If a short or open-circuit is found, repair the harness between these two terminals.
  4.  
  5. Plug all connectors back into their original components.
  6.  



Click image to see an enlarged view

Fig. Fig. 2: The arrangement of the EEP solenoid terminals-all models

2.4L (California) and 3.0L Engines

  1. Unplug the EEP solenoid harness connector and the MFI relay connector. By touching the circuit tester probes to both ends of the harness, check for continuity between the EEP solenoid terminal and the MFI relay. If no continuity is found, repair the circuit between these terminals.
    1. 2.4L (California) engines: EEP terminal 2 and MFI relay terminal 2.
    2.  
    3. 3.0L engines: EEP terminal 1 and MFI relay terminal 5.
    4.  

  2.  
  3. Unplug the ECM harness connector and check for an open or short-circuit to ground between the ECM terminal and the EEP solenoid terminal. If a short or open-circuit is found, repair the harness between these terminals.
    1. 2.4L (California) engines: EEP terminal 1 and ECM terminal 9.
    2.  
    3. 3.0L engines: EEP terminal 2 and ECM terminal 62.
    4.  

  4.  
  5. Plug all connectors back into their original components.
  6.  

COMPONENT TESTING



Although the EEP valve can be tested with a hand vacuum pump (see the earlier described direction for this procedure), the EEP solenoid cannot be tested without an expensive scan tool from Dodge. If the harness checks out OK and the diagnostic code still calls for this component to be checked, take the vehicle to an automotive mechanic familiar with Dodge vehicles.

REMOVAL & INSTALLATION



The EEP solenoid is a part of the EEP valve, and is located next to the EGR valve assembly. Removal of this entire component is necessary. Disconnect and label the vacuum hoses going to the assembly. Unplug and label the harness connectors plugged into the EEP assembly. Remove the mounting bolts holding the assembly in place.

To install the new component, mount the assembly back in place with the mounting bolts. Tighten the bolts until they are snug, plug the harness connectors and the vacuum hoses back into the assembly.

 
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