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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 55 (Automatic Transaxle Diagnosis - 4T65-E) >> Diagnostic Tests >> DTC P1887: Torque Converter Clutch Release Switch Circuit Malfunction >> Diagnostic Aids

Diagnostic Aids

WARNING: This page is about a different car, the 2002 Buick Regal, 2002 Buick Century, 2001 Buick Regal, and 2001 Buick Century. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Do not replace the torque converter for this condition.

Inspect wiring for poor connections at PCM, transaxle in-line 20-way harness connector and TFP manual valve position switch. Check for bent, backed out or damaged terminals, or poor terminal tension. Check for chafed wire or broken wire inside insulation. Check for moisture and corrosion in wiring and connections. When diagnosing intermittent condition, wiggle wiring harness while watching scan tool for change in value.

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