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Home › Cadillac › 2007 › Escalade EXT › Repair and Diagnosis › External Pages › Different car › Section 1040 (Battery, Charging System And Starting System) › Diagnostic Information and Procedures › DTC P0622 › Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2008 GMC Sierra, 2008 GMC Cab & Chassis Sierra, 2008 Chevrolet Silverado, and 2008 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector at the generator.
  2. Ignition ON, engine OFF, connect a test lamp to B+ and repeatedly probe the generator field duty cycle circuit terminal 2, while monitoring the GEN-F Terminal Signal Parameter. The parameter should change from 0 percent to above 95 percent.
    • If the parameter was not affected by the test lamp, test the circuit for a short to voltage, short to ground, or an open/high resistance. If the circuit tests normal, replace the ECM.
  3. If the circuit tests normal, test or replace the generator.
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