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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 102 (Automatic Transmission Diagnosis - 4L60-E) >> Diagnostic Tests >> DTC P1870: Transmission Component Slipping >> Circuit Description

Circuit Description

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The PCM monitors difference between engine speed and transmission output speed. In "D3" range with TCC engaged, engine speed should closely match transmission output speed. In "D4" range with TCC engaged, TCC slip speed should be -20 to 60 RPM. DTC P1870 is set if PCM detects excessive TCC slip when TCC should be engaged.

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