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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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Transmission
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Automatic Trans
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Automatic Transmission Diagnosis - 4L60-E
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Diagnostic Tests
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DTC P1870: Transmission Component Slipping
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Conditions For Setting DTC P1870
Conditions For Setting DTC P1870
DTC will set under the following conditions:
TCC is commanded on for 5 seconds.
TCC is at maximum duty cycle for 8 seconds.
TCC slip speed is 80-800 RPM for 7 seconds.