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

WARNING: This page is about a different car, the 2003 Dodge Dakota. However, it is still accessible from the selected car via links, so may be relevant.
  1. Turn the ignition on, engine not running. With the DRBIII®, read DTC's and record the related freeze frame data. If the good trip counter displays and is equal to zero, go to next step. If the counter does not display or is not equal to zero, see INTERMITTENT CONDITION (NGC)  under SYSTEM TESTS. Perform POWERTRAIN VERIFICATION TEST VER-3 (NGC)  under VERIFICATION TESTS.
  2. Turn the ignition off. Disconnect the generator field harness connector. Jumper a 12-volt test light across the generator harness connector. Turn ignition on, engine not running. With the DRBIII®, actuate the generator field control circuit. If the test light illuminates brightly and flashes on and off, replace the generator. Perform POWERTRAIN VERIFICATION TEST VER-3 (NGC)  under VERIFICATION TESTS. 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 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 one volt, repair the short to voltage in the (K20) gen field control circuit. Perform POWERTRAIN VERIFICATION TEST VER-3 (NGC)  under VERIFICATION TESTS. If the voltage is not above one 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 Miller Special Tool (8815) to perform diagnosis.
  4. Turn the ignition off. Measure the resistance of the (K20) gen field control circuit from the generator field harness connector to the 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. Perform POWERTRAIN VERIFICATION TEST VER-3 (NGC)  under VERIFICATION TESTS.
  5. Measure the resistance between ground and (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. Perform POWERTRAIN VERIFICATION TEST VER-3 (NGC)  under VERIFICATION TESTS. If the resistance is not below 100 ohms, go to next step.
  6. Using a 12-volt test light connected to battery voltage, probe the (Z13) ground circuit in the generator field harness connector. If the test light illuminates, go to next step. If the test light does not illuminate, repair the open in the (Z13) ground circuit. Perform POWERTRAIN VERIFICATION TEST VER-3 (NGC)  under VERIFICATION TESTS.
    7. NOTE: Before continuing, check the PCM connector terminals for corrosion, damage, or pushed out terminals. 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)  under VERIFICATION TESTS.
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