P1586

Schematic:

CIRCUIT DESCRIPTION
The brake switch indicates brake pedal status to the Powertrain Control Module (PCM). The brake switch is a normally-closed switch that supplies battery voltage to the PCM. Applying the brake pedal opens the switch, interrupting voltage to the PCM. This DTC is for manual transmission vehicles only, this switch is used for TCC operation on automatic transmission vehicles.

CONDITIONS FOR RUNNING THE DTC
^ The engine speed is more than 1000 RPM for 1 second.
^ The wheel speed is more than 20 mph in order to enable the diagnostic. The diagnostic disables when the wheel speed is less than 5 mph.

CONDITIONS FOR SETTING THE DTC
^ The vehicle speed decreases 1 MPH in 0.5 seconds without the PCM sensing a switch transition.
^ The condition is present for 10 accel/decel cycles.

ACTION TAKEN WHEN THE DTC SETS
^ The PCM will not illuminate the Malfunction Indicator Lamp (MIL).
^ The PCM will store conditions which were present when the DTC set as Failure Records data only. This information will not be stored as Freeze Frame data.

Steps 1 - 15:

Steps 16 - 17:

CONDITIONS FOR CLEARING THE MIL/DTC
^ A history DTC will clear after 40 consecutive warm-up cycles have occurred without a malfunction.
^ The DTC can be cleared by using a scan tool.

DIAGNOSTIC AIDS
Inspect for the following:
^ Ask about the customers driving habits. Ask about unusual driving conditions (e.g. stop and go, expressway, etc.).
^ Inspect the brake switch for proper mounting and operation.
^ Inspect for ABS DTCs. A faulty ABS condition may contribute to setting this DTC.

IMPORTANT: Remove any debris from the connector surfaces before servicing a component. Inspect the connector gaskets when diagnosing or replacing a component. Ensure that the gaskets are installed correctly. The gaskets prevent contaminate intrusion.

^ Poor terminal connection.
Inspect the harness connectors for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, and faulty terminal to wire connection. Use a corresponding mating terminal to test for proper tension. Refer to Testing for Intermittent and Poor Connections and Connector Repairs in Diagrams.
^ Damaged harness.
Inspect the wiring harness for damage. If the harness appears to be OK, observe the display on the scan tool while moving connectors and wiring harnesses related to the sensor. A change in the display may indicate the location of the fault. Refer to Wiring Repairs in Diagrams.
^ Inspect the PCM and the engine grounds for clean and secure connections.

If the DTC is determined to be intermittent, reviewing the Failure Records can be useful in determining when the DTC was last set.