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Home >> Chevrolet >> 2013 >> Sonic RS, Standard Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 320 (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 2012 Chevrolet Sonic. However, it is still accessible from the selected car via links, so may be relevant.
  1. Verify that a test lamp illuminates between the generator B+ circuit terminal and ground.
    • If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
  2. Ignition OFF, disconnect the harness connector at the generator.
  3. Ignition ON, verify the scan tool ECM GEN-F Terminal Signal is less than 5%.
    • If greater than the specified range, test the signal circuit terminal 2 for a short to voltage. If the circuit tests normal, replace the ECM.
  4. Install a 3 A fused jumper wire between the signal circuit terminal 2 and B+. Verify the scan tool ECM GEN-F Terminal Signal is greater than 95%.
    • If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the ECM.
  5. If all circuits test normal, test or replace the generator.
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