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Pinpoint Test D: Electronic Pressure Control (EPC) Solenoid

WARNING: This page is about a different car, the 2007 Ford Ranger. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Refer to the Transmission Vehicle Harness Connector illustration Transmission Connector Layouts .
NOTE: Refer to the Transmission Internal Harness Connector illustration Transmission Connector Layouts .
NOTE: Read and record all DTCs. All Digital transmission range (TR) sensor and vehicle speed sensor (VSS) DTCs must be repaired before entering output state control (OSC).
  1. D1 ELECTRONIC DIAGNOSTICS 
    • Select PARK.
    • Key in OFF position.
    • Check to make sure the transmission harness connector is fully seated, terminals are fully engaged in the connector and in good condition before proceeding.
    • Connect the diagnostic tool.
    • Key in ON position.
    • Access the transmission PIDs.
    • Is the scan tool able to access the transmission PIDs? 
    1. YES  : Go to  D2.
    2. NO  : REPEAT procedure to access the transmission PIDs. If the scan tool did not access the transmission PIDs, REFER to the INTRODUCTION - GASOLINE ENGINES for diagnosis of PCM.
  2. D2 SOLENOID FUNCTIONAL TEST 
    • Install 2,060 kPa (300 psi) pressure gauge into electronic pressure control (EPC) tap.
    • Monitor pressure gauge.
    • Warm up engine to operating temperature.
    • Raise engine speed to 1,500 rpm.
    • Command the LINEDSD PID to change the line pressure.
    • Does the pressure reading match the commanded pressure? 
    1. YES  : CLEAR DTCs.
    2. NO  : Go to  D3.
  3. D3 CHECK FOR BATTERY VOLTAGE 
    • Remove the transmission fluid pan. Refer to Fluid Pan, Gasket and Filter .
    • Visually inspect all wires and connectors for damage.
    • Key in ON position.
    • Measure the voltage with the positive lead connected to VPWR solenoid terminal and negative lead to a good ground.
    • Is the voltage greater than 10 volts? 
    1. YES  : Go to  D4.
    2. NO  : CHECK for open or short circuit in harness.
  4. D4 ELECTRICAL SIGNAL CHECK 
    • Leave positive lead connected to VPWR solenoid terminal and connect negative lead to the signal terminal of the EPC solenoid.
    • Turn the solenoids ON and OFF, while monitoring the voltage reading on the DVOM, solenoid state on the scan tool (ON and OFF), listen for the solenoid to activate (click).
    • Does the voltage and solenoid state change? 
    1. YES  : Go to  D5.
    2. NO  : CHECK for open or short circuit in harness or PCM.
  5. D5 CHECK SOLENOID RESISTANCE AT SOLENOID 
    • Disconnect: Transmission Harness
      • Fig 1: Connecting Ohmmeter At Terminals Of Solenoid
      GF0009971Courtesy of FORD MOTOR CO.
    • Check solenoid resistance by connecting an ohmmeter at the terminals of the solenoid.
    • Measure and record the resistance of the EPC solenoid. Resistance should be between 3.7-7.2 ohms.
    • Is the resistance within specifications? 
    1. YES  : Go to  D6.
    2. NO  : INSTALL a new solenoid and install the transmission fluid pan.
  6. D6 CHECK SOLENOID FOR SHORT TO GROUND  
      Fig 2: Checking Continuity Between Engine Ground & EPC Solenoid Terminals With Ohmmeter
      GF0009972Courtesy of FORD MOTOR CO.
    • Check for continuity between engine Ground and the EPC solenoid terminals with ohmmeter or other low current tester (less than 200 milliamps). Connection should show infinite resistance (no continuity).
      Solenoid Terminal
      EPC +/-
    • Is there continuity? 
    1. YES  : INSTALL a new solenoid and install the transmission fluid pan.
    2. NO  : REFER to the Diagnosis by Symptom Index in Diagnosis By Symptom  for pressure concerns.
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