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Pinpoint Test A: Shift Solenoids

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. A1 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 the vehicle enter OTM? 
    1. YES  : REMAIN in OTM. Go to  A2 .
    2. NO  : PRESS START. If vehicle does not enter OTM, REFER to the Introduction - Gasoline Engines article.
  2. A2 CHECK ELECTRICAL SIGNAL OPERATION 
    • Key in OFF position.
    • Disconnect: Transaxle Connector C199
    • Use a mirror to inspect both ends of the transaxle 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
      GF0024695Courtesy of FORD MOTOR CO.
    • Measure the voltage between C199 pin 9 and solenoid circuit C199 pins 5 and 7 at the transaxle vehicle harness connector.
    • While observing the VOM, press START and STOP to cycle the solenoid output on and off.
    • Does the suspected solenoid output voltage change at least 0.5 volt? 
    1. YES  : Go to  A5.
    2. NO  : Go to  A3.
  3. A3 CHECK CONTINUITY OF SOLENOID SIGNAL AND VPWR HARNESS CIRCUITS 
    • Key in OFF position.
    • Disconnect: Transaxle Connector
    • Disconnect: PCM
    • Inspect for damaged or pushed-out pins, corrosion or loose wires.
      • Fig 2: Checking Circuit For Open
      GF0024696Courtesy of FORD MOTOR CO.
    • Measure the resistance between the PCM C175T pin 43 and the transaxle vehicle harness connector C199 pin 5.
      • Fig 3: Checking Circuit For Open
      GF0024697Courtesy of FORD MOTOR CO.
    • Measure the resistance between the PCM C175T pin 42 and the transaxle vehicle harness C199 pin 7.
      • Fig 4: Checking Circuit For Open
      GF0024698Courtesy of FORD MOTOR CO.
    • Measure the resistance between the PCM C175B pins 35 and 36 and the transaxle vehicle harness C199 pin 9.
    • Is each resistance less than 5 ohms? 
    1. YES  : Go to  A4.
    2. NO  : REPAIR open circuit(s). RECONNECT all components. RERUN Quick Test.
  4. A4 CHECK SOLENOID HARNESS FOR SHORT TO POWER AND GROUND 
      Fig 5: Checking Solenoid Harness For Short To Power & Ground (1 Of 7)
      GF0024699Courtesy of FORD MOTOR CO.
    • Measure the resistance between the PCM C175T pin 43 and the PCM C175B pins 35 and 36.
      • Fig 6: Checking Solenoid Harness For Short To Power & Ground (2 Of 7)
      GF0024700Courtesy of FORD MOTOR CO.
    • Measure the resistance between the PCM C175T pin 42 and the PCM C175B pins 35 and 36.
      • Fig 7: Checking Solenoid Harness For Short To Power & Ground (3 Of 7)
      GF0024701Courtesy of FORD MOTOR CO.
    • Measure the resistance between the PCM C175T pin 43 and the PCM C175B pins 47, 48, 49 and chassis ground.
      • Fig 8: Checking Solenoid Harness For Short To Power & Ground (4 Of 7)
      GF0024702Courtesy of FORD MOTOR CO.
    • For vehicles equipped with a 2.3L engine, measure the resistance between the PCM C175T pin 43 and the PCM C175T pin 41 and chassis ground.
      • Fig 9: Checking Solenoid Harness For Short To Power & Ground (4 Of 7)
      GF0024702Courtesy of FORD MOTOR CO.
    • For vehicles equipped with 3.0L engine, measure the resistance between the PCM C175T pin 43 and the PCM C175E pin 41 and chassis ground.
      • Fig 10: Checking Solenoid Harness For Short To Power & Ground (5 Of 7)
      GF0024703Courtesy of FORD MOTOR CO.
    • Measure the resistance between the PCM C175T pin 42 and the PCM C175B pins 47, 48, 49 and chassis ground.
      • Fig 11: Checking Solenoid Harness For Short To Power & Ground (6 Of 7)
      GF0024704Courtesy of FORD MOTOR CO.
    • For vehicles equipped with a 2.3L engine, measure the resistance between the PCM C175T pin 42 and the PCM C175T pin 41 and chassis ground.
      • Fig 12: Checking Solenoid Harness For Short To Power & Ground (7 Of 7)
      GF0024704Courtesy of FORD MOTOR CO.
    • For vehicles equipped with 3.0L engine, measure the resistance between the PCM C175T pin 42 and the PCM C175E pin 41 and chassis ground.
    • Is each resistance greater than 10,000 ohms? 
    1. YES  : Go to  A5.
    2. NO  : REPAIR short circuit(s). RECONNECT all components. RERUN Quick Test.
  5. A5 TRANSAXLE FUNCTIONAL TEST  
    CAUTION: Do not pry on the connector. This will damage the connector and can result in a transaxle concern. Press button and pull up on the transaxle vehicle harness connector.
    NOTE: LED will turn GREEN when solenoid activates and turn OFF when deactivated. LED will turn RED if an 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).
    • Disconnect: Transaxle Harness
    • Connect: Transmission Tester C199
    • Carry out the Solenoid Function Tests as outlined in the Transmission Tester Manual.
    • Do the solenoids (LED) activate (LED green)? 
    1. YES  : Go to  A6.
    2. NO  : Go to  A7.
  6. A6 TRANSAXLE DRIVE CYCLE TEST 
    • Connect: PCM
    • Carry out the Dynamic Testing - Engine On as outlined in the Transmission Tester Manual.
    • Does the vehicle upshift when commanded by the tester? 
    1. YES  : INSTALL a new PCM. RECONNECT all components. RERUN On-Board Diagnostics Tests. If symptoms are still present, REFER to Diagnosis By Symptom .
    2. NO  : Go to  A7.
  7. A7 CHECK RESISTANCE OF SOLENOID/HARNESS 
    • Place the Bench/Drive switch in BENCH mode.
    • Rotate solenoid select switch to OHMS CHECK position.
      • Fig 13: Checking Solenoid & Harness
      GF0024705Courtesy of FORD MOTOR CO.
    • Measure the resistance between SS-1 jack and VPWR jack on tester.
      • Fig 14: Checking Solenoid & Harness
      GF0024706Courtesy of FORD MOTOR CO.
    • Measure the resistance between SS-2 jack and VPWR jack on tester.
    • Is the resistance for both solenoids between 12 and 22 ohms? 
    1. YES  : Go to  A8.
    2. NO  : INSTALL a new solenoid body assembly. RECORD and CLEAR the DTCs. RERUN On-Board Diagnostics tests.
  8. A8 CHECK SOLENOID/HARNESS FOR SHORT TO GROUND 
      Fig 15: Checking Solenoid & Harness
      GF0024707Courtesy of FORD MOTOR CO.
    • Measure the resistance of each solenoid between BAT (-) jack (engine ground) and each appropriate jack.
    • Is the resistance greater than 10,000 ohms (no continuity)? 
    1. YES  : REFER to Diagnosis By Symptom .
    2. NO  : INSTALL a new solenoid body assembly. RECORD and CLEAR the DTCs. RERUN On-Board Diagnostics tests.
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