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Home >> Jeep >> 1996 >> Cherokee Classic, Part Time, Automatic >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Engine Controls - Tests W/Codes - 4.0L >> Diagnostic Trouble Code (DTC) Identification >> Test TC-11A - Generator Field Not Switching Properly

Test TC-11A - Generator Field Not Switching Properly

NOTE: For connector terminal identification, refer to CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article in this section.
  1. Using scan tool, actuate generator field driver circuit. Using scan tool in voltmeter mode, backprobe Auto Shutdown (ASD) relay output circuit (Dark Green/Orange wire) in 2-wire connector on rear of generator. If voltage is 10 volts or less, repair open ASD relay output circuit from generator to splice and perform TEST VER-3A . If voltage is more than 10 volts, go to next step.
  2. Backprobe generator field driver circuit (Dark Green wire) in 2-wire connector on rear of generator. If voltage does not cycle from low voltage to high voltage, go to step 6). If voltage cycles from low voltage to high voltage, go to next step.
  3. 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.
  4. 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.
  5. 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 .
  6. 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.
  7. 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.
  8. 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.
  9. 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.
  10. Using scan tool in ohmmeter mode, check resistance of generator field driver circuit (Dark Green wire) in generator 2-wire connector to ground. 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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