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Test A: Shift Solenoids

WARNING: This page is about a different variant/trim than selected.

  1. Electronic Diagnostics

    Ensure transaxle harness connector is in acceptable condition. Repair as necessary. Ensure transaxle harness connector is fully seated. Connect NGS tester or equivalent to DLC. Perform KEY ON ENGINE OFF (KOEO) SELF-TEST  until continuous memory codes have been displayed. See QUICK TEST  under DIAGNOSIS & TESTING. Enter output test mode. See ADDITIONAL SYSTEM FUNCTIONS  under DIAGNOSIS & TESTING. Select ALL ON mode. Push START to turn outputs on. Push STOP to turn outputs off. If vehicle enters output test mode, go to next step. If vehicle will not enter output test mode, see SCAN TOOL UNABLE TO COMMUNICATE  under DIAGNOSIS & TESTING.

  2. Check Electrical Signal Operation

    Disconnect transaxle harness connector. Inspect condition of connector and repair as needed. Using DVOM, connect positive lead to transaxle harness connector terminal No. 2. See Fig 1 . Connect negative lead to suspect solenoid circuit. See SHIFT SOLENOID CIRCUIT CONTINUITY TEST  table. While monitoring DVOM, press START and STOP to cycle solenoid output on and off. If voltage changes at least .5 volt, go to step  5 . If voltage does not change as specified, go to next step.
    Fig 1: Identifying Transaxle Harness Connector Terminals
    G98E07051Courtesy of FORD MOTOR CO.

  3. Check Continuity Of Shift Solenoid Signal & VPWR Harness Circuits

    Ensure ignition switch is turned to OFF position. Disconnect PCM 104-pin connector, and inspect it for damaged terminals, corrosion and loose wires. Repair as necessary. Install breakout box, leaving PCM disconnected. Measure and record resistance between specified transaxle harness connector terminal and breakout box test pin. See SHIFT SOLENOID CIRCUIT CONTINUITY TEST  table. If any resistance reading is 5 ohms or more, repair open circuit. Connect all components. Disconnect breakout box. If each resistance reading is less than 5 ohms, go to next step.

  4. Check Shift Solenoid Harness For Shorts To Power & Ground

    Measure and record resistance between specified breakout box test pins. See SHIFT SOLENOID SHORT CIRCUIT TEST  table. If resistance readings are more than 10 k/ohms, go to next step. If any resistance reading is 10 k/ohms or less, repair short circuit. Connect all components. Disconnect breakout box.
    SHIFT SOLENOID CIRCUIT CONTINUITY TEST

    Solenoid & Transaxle Harness Connector Terminal No. (1) Breakout Box Pin No.
    (SSA) 1 27
    (SSB) 6 1
    (SSC) 8 53
    (VPWR) 2 & 7 71
    (1) See Fig 1 .
    SHIFT SOLENOID SHORT CIRCUIT TEST (1)

    Breakout Box Solenoid Signal Output Pins No. Breakout Box Test Pins No.
    1, 27 & 53 71
    1, 27 & 53 24, 25, 51, 76, 77, 91 & 103
    1, 27 & 53 Ground
    (1) Measure between breakout box test pins.

  5. Shift Solenoid Functional Test

    Connect transmission tester. Perform solenoid voltage test. See transmission tester instructions. If solenoid activates (Green LED on), go to next step. If LED turns Red (shorted to VPWR) or if solenoid does not activate LED (shorted to ground or open circuit), go to step  7 .

  6. Transaxle Drive Test

    Connect PCM 104-pin connector. Perform TRANSAXLE DYNAMIC DRIVE CYCLE TEST  under DIAGNOSIS & TESTING. If transaxle does not upshift when operated by transmission tester, go to next step. If transaxle upshifts when operated with transmission tester, replace PCM. Connect all components. Clear DTCs. See CLEARING DIAGNOSTIC TROUBLE CODES  under DIAGNOSIS & TESTING. Disconnect breakout box and repeat QUICK TEST  under DIAGNOSIS & TESTING. If symptom is still present, see SYMPTOM DIAGNOSIS under TROUBLE SHOOTING in FORD AX4S OVERHAUL article.

  7. Check Resistance Of Shift Solenoids

    Set transmission tester Bench/Drive switch to BENCH position. Set gear select switch to OHMS CHECK position. Measure and record resistances between VPWR jack and SSA, SSB and SSC jack on transmission tester. If resistance readings are 15-25 ohms, go to next step. If any resistance reading is not 15-25 ohms, go to step  9 .
    8. NOTE: Reading should be performed with a low current tester less than 200 milliamps.

  8. Check Shift Solenoid For Short To Ground
    Check continuity between BAT (-) jack and SSA, SSB and SSC jack on transmission tester. If continuity exists, go to next step. If continuity does not exist, see SYMPTOM DIAGNOSIS under TROUBLE SHOOTING in FORD AX4S OVERHAUL article.

  9. Internal Electronic Diagnostics

    Drain transaxle fluid. Remove transaxle side cover. Inspect all internal harness connectors. Ensure all connectors are fully connected and not damaged. Repair as needed. Install all components in reverse order of disassembly. Fill transaxle with fluid. Clear DTCs. See CLEARING DIAGNOSTIC TROUBLE CODES  under DIAGNOSIS & TESTING. Repeat QUICK TEST  under DIAGNOSIS & TESTING. If internal harness connectors are okay, go to next step.

  10. Check Internal Transaxle Harness Continuity

    Disconnect internal harness from shift solenoid assemblies. Measure and record resistance between transmission tester SSA, SSB, and SSC terminals and appropriate solenoid connectors. See INTERNAL HARNESS OPEN CIRCUIT TEST  table. If resistance readings are .5 ohm or less, go to next step. If any resistance measured is more than .5 ohm, replace internal harness. Go to step  12 .
    INTERNAL HARNESS OPEN CIRCUIT TEST

    Transmission Tester Shift Solenoid Terminals Shift Solenoid Connector Wire Color
    SSA Orange
    SSB Pink
    SSC Yellow
    VPWR Red

  11. Check Internal Harness For Shorts To Ground

    Using transmission tester, check continuity between each shift solenoid connector terminal and BAT (-) terminal of transmission tester. If continuity does not exist in any circuit, go to next step. If continuity exists in any circuit, replace internal harness and go to next step.

  12. Check Resistance Of Shift Solenoid

    Using ohmmeter, measure resistance between terminals of each shift solenoid. If resistance readings are 15-25 ohms, go to next step. If resistance readings are not 15-25 ohms, replace faulty shift solenoid. Install all components in reverse order of disassembly. Fill transaxle with fluid. Clear DTCs. See CLEARING DIAGNOSTIC TROUBLE CODES  under DIAGNOSIS & TESTING. Repeat QUICK TEST  under DIAGNOSIS & TESTING.

  13. Check Shift Solenoid For Short To Ground

    Using ohmmeter, check continuity between each shift solenoid terminal and ground. If continuity exists, replace faulty shift solenoid. Install all components in reverse order of disassembly. Fill transaxle with fluid. Clear DTCs. See CLEARING DIAGNOSTIC TROUBLE CODES  under DIAGNOSIS & TESTING. Repeat QUICK TEST  under DIAGNOSIS & TESTING. If continuity does not exist, see SYMPTOM DIAGNOSIS under TROUBLE SHOOTING in FORD AX4S OVERHAUL article.
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