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DTC P0622: Generator Field Control Circuit (NGC): Testing

WARNING: This page is about a different car, the 2004 Dodge Pickup and 2004 Dodge Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
  1. Turn ignition on, engine not running. With the DRBIII(R), read DTC's and record the related freeze frame data. If the good trip counter displayed and equal to zero, go to next step. If the good trip counter does not equal zero, see INTERMITTENT CONDITION  . See POWERTRAIN VERIFICATION TEST VER-3 (NGC)  .
  2. Turn the ignition off. Disconnect the generator field harness connector. Using a 12-volt test light, jump it across the generator field harness connector. Turn the ignition on, engine not running. With the DRBIII(R), actuate the generator field control circuit. If the test light illuminates and flashes on and off, replace the generator. See POWERTRAIN VERIFICATION TEST VER-3 (NGC)  . If the test light does not illuminate or flash on and off, go to next step.
  3. Turn the ignition off. Disconnect the PCM harness connectors. Turn the ignition on, engine not running. Measure the voltage on the (K20) gen field control circuit in the generator field harness connector. If the voltage is above 1 volt, repair the short to voltage in the (K20) gen field control circuit. See POWERTRAIN VERIFICATION TEST VER-3 (NGC)  . If the voltage is not above 1 volt, go to next step.
    4. CAUTION: DO NOT probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install the Miller Special Tool (8815) to perform the diagnosis.
  4. Turn the ignition off. Measure the resistance of the (K20) gen field control circuit from the generator field harness connector to appropriate terminal of the Miller Special Tool (8815). 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. See POWERTRAIN VERIFICATION TEST VER-3 (NGC)  .
  5. Measure the resistance between ground and the (K20) gen field control circuit in the generator field harness connector. If the resistance is below 100 ohms, repair the short to ground in the (K20) gen field control circuit. See POWERTRAIN VERIFICATION TEST VER-3 (NGC)  . If the resistance is below 100 ohms, go to next step.
  6. Using a 12-volt test light connected to battery voltage, probe the (Z346) ground circuit in the gen field harness connector. If the test light illuminates, go to next step. If the test light does not illuminate, repair the open in the (Z346) ground circuit. See POWERTRAIN VERIFICATION TEST VER-3 (NGC)  .
    7. NOTE: Before continuing, check the PCM connector terminals for corrosion, damage, or terminal push out. Repair as necessary.
  7. Using the 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 PROGRAMMING  . Perform POWERTRAIN VERIFICATION TEST VER-3 (NGC)  .
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