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Home >> Mazda >> 2002 >> Tribute LX, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 48 (Engine Controls - Self-Diagnostics) >> Diagnostic Tests >> DTC P1780: Transmission Control Switch Malfunction Or Transmission Control Indicator Light Circuit Malfunction >> Detection Condition

Detection Condition

WARNING: This page is about a different car, the 2002 Mazda B4000, 2002 Mazda B3000, and 2002 Mazda B2300. However, it is still accessible from the selected car via links, so may be relevant.

DTC P1780 indicates TCS was not cycled during KOER self-test. Transmission Control Switch (TCS) is a momentary contact switch that allows driver to cancel overdrive gear. When TCS is pressed, a signal is sent to PCM which then uses the shift solenoids to disengage/disable overdrive gear operation. At the same time, Transmission Control Indicator Light (TCIL) is illuminated to notify driver that overdrive gear is canceled. When TCS is pressed again, overdrive gear operation is enabled and TCIL is turned off.

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