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P1805 BRAKE SWITCH EC-417 < DTC/CIRCUIT DIAGNOSIS > [VK56DE] C D E F G H I J K L M A EC N P O P1805 BRAKE SWITCH Description INFOID:0000000009886862 Brake switch signal is applied to the ECM through the stop lamp switch when the brake pedal is depressed. This signal is used mainly to decrease the engine speed when the vehicle is driving. On Board Diagnosis Logic INFOID:0000000009886863 The MIL will not light up for this self-diagnosis. FAIL-SAFE MODE When the malfunction is detected, the ECM enters fail-safe mode. DTC Confirmation Procedure INFOID:0000000009886864 1. Turn ignition switch ON. Diagnosis Procedure INFOID:0000000009886865 1. CHECK STOP LAMP SWITCH CIRCUIT 1. Turn ignition switch OFF. 2. Check the stop lamp when depressing and releasing the brake pedal. OK or NG OK >> GO TO 4. NG >> GO TO 2. 2. CHECK STOP LAMP SWITCH POWER SUPPLY CIRCUIT DTC No. Trouble diagnosis name DTC detecting condition Possible cause P1805 Brake switch A brake switch signal is not sent to ECM for ex- • Harness or connectors (Stop lamp switch circuit is open or short- • Stop lamp switch Engine operating condition in fail-safe mode ECM controls the electric throttle control actuator by regulating the throttle opening to a small range. Vehicle condition Driving condition When engine is idling Normal When accelerating Poor acceleration Brake pedal Stop lamp Fully released Not illuminated Depressed Illuminated |