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Home >> Suzuki >> 2009 >> XL7 Luxury, AWD >> Repair and Diagnosis >> Electrical >> Charging Systems >> Diagnostic Information and Procedures >> DTC P0621: Generator L-Terminal Circuit >> Circuit/System Testing
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Circuit/System Testing

  1. Ignition OFF, disconnect the X1 harness connector at the generator.
  2. Ignition ON, test for less than 1 V between the turn on signal circuit terminal 1 and ground.
    • If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the ECM.
  3. Engine running, test for greater than 3.5 V between the turn on signal circuit terminal 1 and ground.
    • 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.
  4. If the circuit tests normal, test or replace the generator.
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