Toyota Corolla (E120): Circuit description

This signal is used to detect that the brakes have been applied. The stp signal voltage is the same as the one supplied to the stop lights.

The stp signal is used mainly to control the fuel cut–off engine speed (the fuel cut–off engine speed is reduced slightly when the vehicle is braking.).

Wiring diagram

Inspection procedure

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    Overhaul
    1. Drain clutch fluid 2. Remove brake master cylinder sub–assy 3. Remove brake booster assy 4. Disconnect clutch reservoir tube Loosen the clip and disconnect the clutch reservoir tube from the clutch master cylinder assy. Hint: use a container to catch the fluid. 5. Disconnect ...

    Replacement
    Hint: installation is in the reverse order of the removal. But the installation is indicated only when it has a point. 1. Remove spare wheel cover assy 2. Remove rear floor finish plate Remove the 3 clips.  using a moulding remover, remove the rear floor finish plate. 3. Rem ...

    Overhaul
    Hint: overhaul the rh side by the same procedure as the lh side. 1. Remove front wheel 2. Drain brake fluid Notice: wash the brake fluid off immediately if it comes into contact with any painted surface. 3. Remove front disc brake cylinder sub–assy Remove the union bolt and gasket ...