Diagnostic Procedure
WARNING: This page is about a different car, the 2005 Jeep Liberty. However, it is still accessible from the selected car via links, so may be relevant.
P0622-GENERATOR FIELD CONTROL CIRCUIT DIAGNOSTIC TEST REFERENCE
| TEST | ACTION | APPLICABILITY |
|---|---|---|
| 1 | Ignition on, engine not running. With the DRBIII®, read DTCs and record the related Freeze Frame data. Is the Good Trip Counter displayed and equal to zero? Yes --> Go To 2 No --> Refer to the INTERMITTENT CONDITION SYMPTOM . Perform POWERTRAIN VERIFICATION TEST VER - 3 . |
All |
| 2 | Turn the ignition off. Disconnect the Generator Field harness connector. Jump a 12-volt test light across the Generator Field harness connector. Ignition on, engine not running. With the DRBIII®, actuate the Generator Field Control circuit. Does the test light illuminate brightly and flash on and off? Yes --> Replace the Generator. Perform POWERTRAIN VERIFICATION TEST VER - 3 . No --> Go To 3 |
All |
| 3 | Turn the ignition off. Disconnect the C2 PCM harness connector. Ignition on, engine not running. Measure the voltage on the (K125) Gen Field Control circuit in the Generator Field harness connector. Is the voltage above 1.0 volt? Yes --> Repair the short to voltage in the (K125) Gen Field Control circuit. Perform POWERTRAIN VERIFICATION TEST VER - 3 . No --> Go To 4 |
All |
| 4 | Turn the ignition off.
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. Measure the resistance of the (K125) Gen Field Control circuit from the Generator Field harness connector to the appropriate terminal of the special tool #8815. Is the resistance below 5.0 ohms? Yes --> Go To 5 No --> Repair the open in the (K125) Gen Field Control circuit. Perform POWERTRAIN VERIFICATION TEST VER - 3 . |
All |
| 5 | Measure the resistance between ground and (K125) Gen Field Control circuit in the Generator Field harness connector. Is the resistance below 100 ohms? Yes --> Repair the short to ground in the (K125) Gen Field Control circuit. Perform POWERTRAIN VERIFICATION TEST VER - 3 . No --> Go To 6 |
All |
| 6 | Using a 12-volt test connected to battery voltage, probe the (Z212) Ground circuit in the Generator Field harness connector. Does the test light illuminate brightly? Yes --> Go To 7 No --> Repair the open in the (Z212) Ground circuit. Perform POWERTRAIN VERIFICATION TEST VER - 3 . |
All |
| 7 |
NOTE:
Before continuing, check the PCM connector terminals for corrosion, damage, or terminal push out. Repair as necessary. 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, view repair.RepairReplace and program the Powertrain Control Module per Service Information.Perform POWERTRAIN VERIFICATION TEST VER - 3 . |
All |