LEMON Manuals: Even more car manuals for everyone
Home >> Ford >> 2009 >> Flex Limited, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 985 (Automatic Transmission - Cd4E) >> Diagnostic Tests >> Pinpoint Tests - Non OSC Equipped Vehicle >> Pinpoint Tests >> Pinpoint Test E: Electronic Pressure Control (EPC) Solenoid

Pinpoint Test E: Electronic Pressure Control (EPC) Solenoid

WARNING: This page is about a different car, the 2007 Mercury Mariner and 2007 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Refer to the Transaxle Vehicle Harness Connector illustration Transaxle Connector Layouts .
  1. E1 ELECTRONIC DIAGNOSTICS 
    • Key in OFF position.
    • Make sure the transaxle vehicle harness connector is fully seated, terminals are fully engaged in connector and in good condition before proceeding.
    • Connect the diagnostic tool.
    • Key in ON position.
    • Carry out KOEO Test until continuous DTCs have been displayed.
    • Enter Output Test Mode (OTM). Refer to On-Board Diagnostics.
    • Select the mode ALL ON. Push START to turn outputs on. Push STOP to turn outputs off.
    • Does vehicle enter OTM? 
    1. YES  : REMAIN in OTM. Go to  E2 .
    2. NO  : PRESS START. If vehicle does not enter OTM, REFER to the Introduction - Gasoline Engines article.
  2. E2 CHECK ELECTRICAL SIGNAL OPERATION 
    CAUTION: Do not pry on the connector. Pull up on the transaxle vehicle harness connector.
    • Key in OFF position.
    • Disconnect: Transaxle Connector C199
    • Use a mirror to inspect both ends of connector for damaged or pushed-out pins, corrosion, loose wires and missing or damaged seals.
    • Key in ON position.
      • Fig 1: Checking Circuit For Voltage
      GF0024729Courtesy of FORD MOTOR CO.
    • Measure the voltage between C199 pin 6 and pin 10 of the transaxle vehicle harness.
    • While observing VOM, press START and STOP to cycle solenoid output on and off.
    • Does the suspect solenoid output voltage change at least 0.5 volt? 
    1. YES  : Go to  E5.
    2. NO  : Go to  E3.
  3. E3 CHECK CONTINUITY OF SOLENOID SIGNAL AND VPWR HARNESS CIRCUITS 
    • Key in OFF position.
    • Disconnect: PCM
    • Inspect for damaged or pushed-out pins, corrosion or loose wires.
      • Fig 2: Checking Circuit For Open
      GF0024730Courtesy of FORD MOTOR CO.
    • Measure the resistance between the PCM C175B pins 35 and 36 and the transaxle harness C199 pin 6.
      • Fig 3: Checking Circuit For Open
      GF0024731Courtesy of FORD MOTOR CO.
    • Measure the resistance between the PCM C175T pin 11 and the transaxle harness C199 pin 10.
    • Is each resistance less than 5 ohms? 
    1. YES  : Go to  E4.
    2. NO  : REPAIR open circuit(s). RECONNECT all components. CLEAR the DTCs and RERUN On-Board Diagnostics.
  4. E4 CHECK HARNESS FOR SHORT TO POWER AND GROUND 
    • Key in OFF position.
    • Disconnect: Transaxle Connector C199
      • Fig 4: Checking Circuits For Short Together
      GF0024732Courtesy of FORD MOTOR CO.
    • Measure the resistance between the PCM C175T pin 11 and the PCM C175B pins 35 and 36.
      • Fig 5: Checking Circuits For Short Together
      GF0024733Courtesy of FORD MOTOR CO.
    • Measure the resistance between the PCM C175T pin 11 and the PCM C175B pins 47, 48 and 49.
      • Fig 6: Checking Circuits For Short Together
      GF0024734Courtesy of FORD MOTOR CO.
    • For vehicles equipped with 2.3L engine, measure the resistance between the PCM C175T pin 11 and the PCM C175T pin 41.
      • Fig 7: Checking Circuits For Short Together
      GF0024734Courtesy of FORD MOTOR CO.
    • For vehicles equipped with 3.0L engine, measure the resistance between the PCM C175T pin 11 and the PCM C175E pin 41.
    • Is each resistance greater than 10,000 ohms? 
    1. YES  : Go to  E5.
    2. NO  : REPAIR short circuit(s). RECONNECT all components. CLEAR the DTCs and RERUN On-Board Diagnostics.
  5. E5 TRANSAXLE FUNCTIONAL TEST 
    NOTE: LED will turn GREEN when solenoid activates and turn OFF when deactivated. LED will turn RED if activated solenoid/harness is shorted to B+. LED will remain OFF if an activated solenoid/harness is shorted to ground or no continuity (open circuit).
    • Connect: PCM
    • Disconnect: Transaxle Connector C199
    • Install line pressure gauge at line tap on case.
    • Connect: Transmission Tester
    • Set Bench/Drive switch to DRIVE mode.
    • Rotate gear selector switch to 1st gear position.
    • Carry out the EPC Functional Test as outlined in Transmission Tester Manual.
    • Observe line pressure on gauge while pressing the EPC switch (engine must be running).
    • Does EPC (LED) activate when EPC switch is pressed and line pressure drops? 
    1. YES  : INSTALL a new PCM. RERUN On-Board Diagnostics.
    2. NO  : Go to  E6.
  6. E6 CHECK RESISTANCE OF SOLENOID/HARNESS 
    • Set Bench/Drive switch to BENCH mode.
    • Rotate gear select switch to OHMS CHECK position.
      • Fig 8: Checking Solenoid & Harness
      GF0024735Courtesy of FORD MOTOR CO.
    • Measure the resistance between EPC jack and VPWR jack on the Transmission Tester.
    • Is resistance between 3.75-5.92 ohms? 
    1. YES  : Go to  E7.
    2. NO  : INSTALL a new solenoid body assembly. CLEAR the DTCs. RERUN On-Board Diagnostics tests.
  7. E7 CHECK SOLENOID/HARNESS FOR SHORT TO GROUND 
      Fig 9: Checking Circuit For Short To Ground
      GF0024736Courtesy of FORD MOTOR CO.
    • Measure the resistance between BAT- jack (engine ground) and EPC, and VPWR/EPC PWR on the transmission tester.
    • Is the resistance greater than 10,000 ohms? 
    1. YES  : INSTALL a new solenoid body assembly. REFER to Main Control Valve Body . RECORD and CLEAR the DTCs. RERUN On-Board Diagnostics tests.
    2. NO  : REFER to Diagnosis By Symptom .
scientia non olet · About LEMON Manuals