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DTC P0622: Generator Field Not Switching Properly (Gas): 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 ignition on, engine not running. Record all DTC's and the related freeze frame data. Using a 12-volt test light connected to ground, backprobe the (K20) gen field control circuit at the back of the generator. With the DRBIII®, actuate the generator field driver. If the test light blinks, see INTERMITTENT CONDITION (GAS)  under SYSTEM TESTS. Perform POWERTRAIN VERIFICATION TEST VER-3  under VERIFICATION TESTS. 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) generator field source circuit at back of generator with a voltmeter. With the DRBIII®, 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) generator field source circuit. Perform POWERTRAIN VERIFICATION TEST VER-3  under VERIFICATION TESTS.
  3. Turn the ignition off. Disconnect the PCM harness connectors. Disconnect the generator field harness connector. 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) generator field control circuit. Perform POWERTRAIN VERIFICATION TEST VER-3  under VERIFICATION TESTS.
  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) generator field control circuit. Perform POWERTRAIN VERIFICATION TEST VER-3  under VERIFICATION TESTS. If the resistance is not below 100 ohms, go to next step.
  5. Measure the resistance across the generator field terminals at the generator. If the resistance is between .5 ohm and 15 ohms, go to next step. If the resistance is not between .5 and 15 ohms, repair the generator as necessary. Perform POWERTRAIN VERIFICATION TEST VER-3  under VERIFICATION TESTS.
    6. NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or pushed out terminals. Repair as necessary.
  6. 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  under VERIFICATION TESTS.
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