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P0622: Generator Field Not Switching Properly: Testing

  1. Turn ignition on, engine not running. Record all DTC's and the related Freeze Frame data. Using 12-volt test light connected to ground, backprobe the (K20) gen field control circuit at the back of the generator. With the DRBIII(R), actuate the generator field driver. If the test light blinks, see INTERMITTENT CONDITIONS  . Perform Verification Test Ver-3. See VERIFICATION TEST VER-3  . If the test light does not blink, go to next step.
  2. Turn the ignition on, engine not running. Carefully inspect all connectors for corrosion or spread terminals before continuing. Backprobe the (K125) genreator field source circuit at back of generator with a voltmeter. With the DRBIII(R), actuate the generator field driver. If the voltage is above 10 volts, go to next step. If the voltage is not above 10 volts, repair the open in the (K125) gen field source circuit. Perform Verification Test Ver-3. See VERIFICATION TEST VER-3  .
  3. Turn ignition off. Disconnect the PCM harness connectors. Disconnect the generator field harness connectors. Measure the resistance of the (K20) generator field control circuit from the generator field harness connector to the PCM harness connector. If the resistance is below 5 ohms, go to next step. If the resistance is not below 5 ohms, repair the open in the (K20) gen field control circuit. Perform Verification Test Ver-3. See VERIFICATION TEST VER-3  .
  4. Measure the resistance between ground and the (K20) generator field control circuit in the PCM harness connector. If the resistance is below 100 ohms, repair the short to ground in the (K20) gen field control circuit. Perform Verification Test Ver-3. See VERIFICATION TEST VER-3  . If the resistance is not below 100 ohms, go to next step.
  5. Measure resistance across the generator field terminals at the generator. If the resistance is between .50-15 ohms, go to next step. If the resistance is not between .50-15 ohms, repair the generator as necessary. Perform Verification Test Ver-3. See VERIFICATION TEST VER-3  .
    6. NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.
  6. Using schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all power and ground circuits. If there are no possible causes remaining, replace and program the PCM. See POWERTRAIN CONTROL MODULE  . Perform Verification Test Ver-3. See VERIFICATION TEST VER-3  .
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