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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1270 (Battery, Charging System & Starting System) >> Diagnostic Information and Procedures >> DTC P1637 >> Conditions for Setting the DTC

Conditions for Setting the DTC

WARNING: This page is about a different car, the 2004 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.

Key ON Test

  1. The ECM detects a high signal voltage on the generator turn on signal circuit for at least 5 seconds.
  2. The engine must be started.

During the RUN test, the ECM detects a low signal voltage on the generator turn on signal circuit for at least 5 seconds.

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