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2002
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Blazer 4D Utility, 4WD, Part Time
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Repair and Diagnosis
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Charging System
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Diagnostic Tests
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DTC P0621: High Or Low Generator Turn On Signal
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Conditions For Setting DTC
Conditions For Setting DTC
The PCM detects the GEN L-Terminal active with the ignition ON.
The PCM detects the GEN L-Terminal inactive with the engine operating.
The above conditions are present for 6 seconds.