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Circuit/System Verification

WARNING: This page is about a different car, the 2008 Isuzu i-370, 2008 Isuzu i-290, 2008 GMC Canyon, and 2008 Chevrolet Colorado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Engine running, observe the scan tool ECM GEN-F Terminal Signal parameter. The parameter should read greater than 5 percent.
    • If not within the specified range, refer to ECM Field Duty Cycle Signal Circuit Malfunction below.
  2. Verify that the GBCM does not set DTC B1492.
    • If the GBCM sets DTC B1492, refer to GBCM Field Duty Cycle Signal Circuit Malfunction below.
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