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Diagnostic Aids

WARNING: This page is about a different car, the 1996 Ford Ranger. However, it is still accessible from the selected car via links, so may be relevant.

Perform this test when instructed during QUICK TEST  or if directed by other test procedures. This test is used to diagnose the following:

Fig 1: Transmission Circuit & Connector Terminals (AX4S & AX4N)
G96A01052
Fig 2: Transmission Circuit & Connector Terminals (CD4E)
G96C01053
Fig 3: Transmission Circuit & Connector Terminals (E40D)
G96E01054
Fig 4: Transmission Circuit & Connector Terminals (F4E)
G96H01055
Fig 5: Transmission Circuit & Connector Terminals (4R44E & 4R55E)
G96J01056
Fig 6: Transmission Circuit & Connector Terminals (4R7OW)
G96B01057
TRANSMISSION SOLENOID IDENTIFICATION

Solenoid Test Pin KOEO Code
CCS
E4OD 53 P1727 & P1754
4R44E & 4R55E 28 P1727 & P1754
EPC 81 P0746, P1746 P1747 & P1749
SS1 27 P0750, P0751 & P1751
SS2 1 P0755, P0756, & P1756
SS3 53 P0760, P0761 & P1761
TCC
AX4N & AX4S 82 P0741, P0743, P1741, P1742, P1743 & P1744
CD4E, E40D, F4E, 4R44E, 4R55E & 4R70W 54 P0741, P0743, P1741, P1742, P1743 & P1744
3-2T/CCS 102 P1788 & P1789
  1. Step 1) DTC P0731/P0781, P0732/P0782, P0733/P0783, P0734/P0784, P0750, P0751, P0755, P0756, P0760, P0761, P1751, P1756 & P1761  These codes indicate transmission mechanical failure or electrical malfunction. Probable causes are as follows:
    • Internal transmission damage.
    • Shift solenoid damage.
    • Shift solenoid circuit damage.
    • Faulty Powertrain Control Module (PCM).

    Turn ignition off. Disconnect transmission wiring harness connector. Using a mirror, inspect connector terminals for damage, corrosion, loose wires or pushed out pins. Repair if necessary. Connect DVOM between VPWR terminal and suspect Shift Solenoid (SS) terminal at transmission wiring harness connector. Repeat procedures under KOEO SELF-TEST . If DVOM voltage reading cycles, fault is internal transmission damage. If DVOM voltage reading does not cycle, go to next step.

  2. Step 2) Check VPWR Circuit At Solenoid  Leave transmission wiring harness connector disconnected. Turn ignition off. Disconnect PCM 104-pin connector. Inspect pins for damage and repair if necessary. Install EEC-V Breakout Box (014-00950), leaving PCM disconnected. Turn ignition on. Measure voltage between test pins No. 71 and 97 (VPWR) at breakout box and chassis ground. If voltage is 10.5 volts or more, go to next step. If voltage is less than 10.5 volts, repair open in VPWR circuit. Clear PCM memory and repeat QUICK TEST .
  3. Step 3) Leave transmission wiring harness connector disconnected. Turn ignition off. Measure and record resistance between VPWR terminal of transmission wiring harness connector and test pins No. 71 and 97 (VPWR) at breakout box. Measure and record resistance between suspect solenoid terminal of transmission wiring harness connector and suspect solenoid terminal at breakout box. If each resistance measurement is less than 5 ohms, go to next step. If any resistance measurement is 5 ohms or more, repair open circuit and repeat QUICK TEST .
  4. Step 4) Leave ignition off and transmission wiring harness connector disconnected. Measure and record resistance between suspect solenoid terminal of transmission wiring harness connector and test pins No. 51, 76 and 91 at breakout box. Measure and record resistance between suspect solenoid terminal of transmission wiring harness connector and test pins No. 71 and 97 (VPWR) at breakout box. If any resistance measurement is less than 10,000 ohms, repair short circuit and repeat QUICK TEST . If all resistance measurements are 10,000 ohms or more, fault is internal transmission damage.
  5. Step 5) DTC P0741, P0743, P0746, P1727, P1741, P1742, P1743, P1744, P1746, P1747, P1749, P1754, P1788 & P1789  These codes indicate transmission electrical malfunction. Probable causes are as follows:
    • Internal transmission damage.
    • Shift solenoid damage.
    • Shift solenoid circuit damage.
    • Faulty Powertrain Control Module (PCM).

    Turn ignition off. Disconnect transmission wiring harness connector. Using a mirror, inspect connector terminals for damage, corrosion, loose wires or pushed out pins. Repair if necessary. Connect DVOM between VPWR terminal and suspect Shift Solenoid (SS) terminal at transmission wiring harness connector. Connect scan tester to Data Link Connector (DLC). Using scan tester, activate scan tester Output Test Mode. Cycle suspect solenoid on and off. If DVOM voltage reading cycles, fault is inside transmission. Circuit testing is complete. If DVOM voltage reading does not cycle, go to next step.

  6. Step 6) Check VPWR Circuit At Solenoid  Leave transmission wiring harness connector disconnected. Turn ignition off. Disconnect scan tester (if applicable). Disconnect PCM 104-pin connector. Inspect pins for damage and repair if necessary. Install EEC-V Breakout Box (014-00950), leaving PCM disconnected. Turn ignition on. Measure voltage between test pins No. 71 and 97 (VPWR) at breakout box and chassis ground. If voltage is 10.5 volts or more, go to next step. If voltage is less than 10.5 volts, repair open in VPWR circuit. Clear PCM memory and repeat QUICK TEST .
  7. Step 7) Leave transmission wiring harness connector disconnected. Turn ignition off. Disconnect scan tester. Measure and record resistance between VPWR terminal of transmission wiring harness connector and test pins No. 71 and 97 (VPWR) at breakout box. Measure and record resistance between suspect solenoid terminal of transmission wiring harness connector and suspect solenoid terminal at breakout box. If each resistance measurement is less than 5 ohms, go to next step. If any resistance measurement is 5 ohms or more, repair open circuit and repeat QUICK TEST .
  8. Step 8) Leave ignition off and transmission wiring harness connector disconnected. Measure and record resistance between suspect solenoid terminal of transmission wiring harness connector and test pins No. 51, 76 and 91 at breakout box. Measure and record resistance between suspect solenoid terminal of transmission wiring harness connector and test pins No. 71 and 97 (VPWR) at breakout box. If any resistance measurement is less than 10,000 ohms, repair short circuit and repeat QUICK TEST . If all resistance measurements are 10,000 ohms or more, fault is internal transmission damage.
  9. Step 9) DTC P0731/P0781, P0732/P0782, P0733/P0783, P0734/P0784, P0750, P0751, P0755, P0756, P0760, P0761, P1751, P1756 & P1761  These codes indicate transmission mechanical failure or electrical malfunction. Probable causes are as follows:
    • Internal transmission damage.
    • Shift solenoid damage.
    • Shift solenoid circuit damage.
    • Faulty Powertrain Control Module (PCM).

    Turn ignition off. Disconnect transmission wiring harness connector. Using a mirror, inspect connector terminals for damage, corrosion, loose wires or pushed out pins. Repair if necessary. Connect DVOM between chassis ground and suspect Shift Solenoid (SS) terminal at transmission wiring harness connector. Repeat procedures under KOEO SELF-TEST . If DVOM voltage reading cycles, fault is internal transmission damage. If DVOM voltage reading does not cycle, go to next step.

  10. Step 10) Turn ignition off. Measure resistance between transmission case, engine block, chassis ground and negative battery cable. If each resistance measurement is less than 5 ohms, go to next step. If any resistance measurement is 5 ohms or more, repair ground circuit and repeat QUICK TEST .
  11. Step 11) Leave transmission wiring harness connector disconnected. Turn ignition off. Disconnect PCM 104-pin connector. Inspect pins for damage and repair if necessary. Install EEC-V Breakout Box (014-00950), leaving PCM disconnected. Measure resistance between suspect solenoid terminal of transmission wiring harness connector and suspect solenoid terminal at breakout box. If resistance is less than 5 ohms, go to next step. If any resistance measurement is 5 ohms or more, repair open circuit and repeat QUICK TEST .
  12. Step 12) Check Solenoid Circuit For Short To Power Or Ground  Leave transmission wiring harness connector disconnected. Turn ignition on. Measure voltage between test pins No. 51 and 77 at breakout box and chassis ground. If voltage is less than 5 volts, replace PCM and repeat QUICK TEST . If voltage is 5 volts or more, repair circuit short to power and repeat QUICK TEST .
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