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Test TC-11A - Generator Field Not Switching Properly

NOTE: For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY. For component location see wiring diagram in the WIRING DIAGRAMS article.
  1. Using scan tool, read and record DTCs. Erase DTCs. Inspect all related connectors for corrosion or spread terminals. If connectors are okay, go to next step.
  2. Using scan tool, actuate generator field driver circuit. Using scan tool in voltmeter mode, backprobe generator field source circuit in 2-wire connector on rear of generator. See GENERATOR FIELD SOURCE CIRCUIT IDENTIFICATION table. If voltage is 10 volts or less, repair open in generator field source circuit and perform TEST VER-2A. If voltage is more than 10 volts, go to next step.
    GENERATOR FIELD SOURCE CIRCUIT IDENTIFICATION

    Application Wire Color
    TJ Body Dark Green/Orange
  3. Backprobe field driver circuit (Dark Green wire on all other bodies) in 2-wire connector on rear of generator. If voltage does not cycle from low voltage to high voltage, go to step 7). If voltage cycles from low voltage to high voltage, go to next step.
  4. Condition required to set DTC is not present at this time. GENERATOR FIELD NOT SWITCHING PROPERLY DTC sets if Powertrain Control Module (PCM) tries to regulate generator field with no result. Possible causes are: open or shorted wiring, defective connectors, defective generator or PCM. Go to next step.
  5. Inspect all related wiring and connectors. Repair wiring and connections as necessary and perform TEST VER-3A. If wiring and connections are okay, go to next step.
  6. Ensure actuator test is still running. Using scan tool, check for DTCs. Wiggle wiring harness from generator to PCM and note if GENERATOR FIELD NOT SWITCHING PROPERLY DTC resets. If DTC resets, repair wiring harness as necessary and perform TEST VER-3A. If DTC does not reset, see INACTIVE DTC CONDITION. Test is complete. Perform TEST VER-3A.
  7. Using scan tool, stop generator field driver actuation. Turn ignition off. Disconnect Powertrain Control Module (PCM) connectors. Inspect connectors and terminals for damage. Repair connectors and terminals as necessary and perform TEST VER-3A. If connectors and terminals are okay, go to next step.
  8. Disconnect 2-wire connector on rear of generator. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-3A. If connector and terminals are okay, go to next step.
  9. Using an external ohmmeter, check resistance of generator field driver circuit (Dark Green wire) between PCM White connector and generator 2-wire connector. If resistance is 5 ohms or more, repair open generator field driver circuit between PCM and generator and perform TEST VER-3A. If resistance is less than 5 ohms, go to next step.
  10. Ensure 2-wire connector on rear of generator is disconnected. Using external ohmmeter, check resistance across terminals that 2-wire connector fits on at rear of generator. If resistance is 5 ohms or more, repair or replace generator as necessary and perform TEST VER-3A. If resistance is less than 5 ohms, go to next step.
  11. Check resistance between ground and generator field driver circuit (Dark Green wire) in generator 2-wire connector. If resistance is less than 5 ohms, repair short to ground in field driver circuit and perform TEST VER-3A. If resistance is 5 ohms or more, replace PCM and perform TEST VER-3A.
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