Pinpoint Test A: Shift Solenoids

WARNING: This page is about a different car, the 2006 Mercury Mariner and 2006 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Refer to Figure preceding these pinpoint tests.

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 scan 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?
Yes: REMAIN in OTM. GO to A2.

No: PRESS START. If vehicle does not enter OTM, REFER to INTRODUCTION - GASOLINE .
A2 CHECK ELECTRICAL SIGNAL OPERATION
- Key in OFF position.
- Disconnect: Transaxle Connector.
- 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.
- Measure the voltage between pin 5 and solenoid circuit pins 4 and 6 at the transaxle vehicle harness connector.
  
  Fig 1: Checking Electrical Signal Operation
  Courtesy of FORD MOTOR CO.
- 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?
Yes: GO to A5.

No: GO to A3.
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.
- Measure the resistance between the PCM connector pin T43 and the transaxle vehicle harness connector pin 6.
  
  Fig 2: Checking Continuity Of Solenoid Signal & VPWR Harness Circuits (1 Of 3)
  Courtesy of FORD MOTOR CO.
- Measure the resistance between the PCM connector pin T42 and the transaxle vehicle harness connector pin 4.
  
  Fig 3: Checking Continuity Of Solenoid Signal & VPWR Harness Circuits (2 Of 3)
  Courtesy of FORD MOTOR CO.
- Measure the resistance between the PCM connector pins C35 and C36 and the transaxle vehicle harness connector pin 5.
  
  Fig 4: Checking Continuity Of Solenoid Signal & VPWR Harness Circuits (3 Of 3)
  Courtesy of FORD MOTOR CO.
- Is each resistance less than 5 ohms?
Yes: GO to A4.

No: REPAIR open circuit(s). RECONNECT all components. RERUN Quick Test.
A4 CHECK SOLENOID HARNESS FOR SHORT TO POWER AND GROUND
- Measure the resistance between the PCM connector pin T43 and the PCM connector pins C35 and C36.
  
  Fig 5: Checking Solenoid Harness For Short To Power & Ground (1 Of 6)
  Courtesy of FORD MOTOR CO.
- Measure the resistance between the PCM connector pin T42 and the PCM connector pins C35 and C36.
  
  Fig 6: Checking Solenoid Harness For Short To Power & Ground (2 Of 6)
  Courtesy of FORD MOTOR CO.
- Measure the resistance between the PCM connector pin T43 and the PCM connector pins C47, C48, C49 and chassis ground.
  
  Fig 7: Checking Solenoid Harness For Short To Power & Ground (3 Of 6)
  Courtesy of FORD MOTOR CO.
- Measure the resistance between the PCM connector pin T43 and the PCM connector pin T41 and chassis ground.
  
  Fig 8: Checking Solenoid Harness For Short To Power & Ground (4 Of 6)
  Courtesy of FORD MOTOR CO.
- Measure the resistance between the PCM connector pin T42 and the PCM connector pins C47, C48, C49 and chassis ground.
  
  Fig 9: Checking Solenoid Harness For Short To Power & Ground (5 Of 6)
  Courtesy of FORD MOTOR CO.
- Measure the resistance between the PCM connector pin T42 and the PCM connector pin T41 and chassis ground.
  
  Fig 10: Checking Solenoid Harness For Short To Power & Ground (6 Of 6)
  Courtesy of FORD MOTOR CO.
- Is each resistance greater than 10,000 ohms?
Yes: GO to A5.

No: REPAIR short circuit(s). RECONNECT all components. RERUN Quick Test.
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.
- Carry out the Solenoid Function Tests as outlined in the Transmission Tester Manual.
- Do the solenoids (LED) activate (LED green)?
Yes: GO to A6.

No: GO to A7.
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?
Yes: INSTALL a new PCM. RECONNECT all components. RERUN On-Board Diagnostics Tests. If symptoms are still present, REFER to DIAGNOSIS BY SYMPTOM .

No: GO to A7.
A7 CHECK RESISTANCE OF SOLENOID/HARNESS
- Place the Bench/Drive switch in BENCH mode.
- Rotate solenoid select switch to OHMS CHECK position.
- Measure the resistance between SS-1 jack and VPWR jack on tester.
  
  Fig 11: Checking Resistance Of Solenoid/Harness (1 Of 2)
  Courtesy of FORD MOTOR CO.
- Measure the resistance between SS-2 jack and VPWR jack on tester.
  
  Fig 12: Checking Resistance Of Solenoid/Harness (2 Of 2)
  Courtesy of FORD MOTOR CO.
- Is the resistance for both solenoids between 12 and 22 ohms?
Yes: GO to A8.

No: INSTALL a new solenoid body assembly. RECORD and CLEAR the DTCs. RERUN On-Board Diagnostics tests.
A8 CHECK SOLENOID/HARNESS FOR SHORT TO GROUND
- Measure the resistance of each solenoid between BAT (-) jack (engine ground) and each appropriate jack.
  
  Fig 13: Checking Solenoid/Harness For Short To Ground
  Courtesy of FORD MOTOR CO.
- Is the resistance greater than 10,000 ohms (no continuity)?
Yes: REFER to DIAGNOSIS BY SYMPTOM .

No: INSTALL a new solenoid body assembly. RECORD and CLEAR the DTCs. RERUN On-Board Diagnostics tests.