Toyota RAV4 manuals

Toyota Sienna Service Manual: Brake Switch "A" Circuit

DTC P0571 Brake Switch "A" Circuit

DESCRIPTION

When the brake pedal is depressed, the stop light switch sends a signal to the ECM. When the ECM receives this signal, it cancels the cruise control. The fail-safe function operates to enable normal driving even if there is a malfunction in the stop light signal circuit. The cancellation condition occurs when voltage is applied to terminal STP. When the brake is applied, voltage is normally applied to terminal STP of the ECM through the STOP SW fuse and the stop light switch, and the ECM turns the cruise control off.

DTC No.

DTC Detection Condition

Trouble Area

P0571

Voltage of STP terminal and that of ST1- terminal of ECM are less than 1 V for 0.5 sec. or more
  • Stop light switch
  •  Stop light switch circuit
  •  ECM

WIRING DIAGRAM

WIRING DIAGRAM

INSPECTION PROCEDURE

1 READ VALUE OF INTELLIGENT TESTER

  1. Connect the intelligent tester to the DLC3.
  2. Turn the ignition switch to the ON position, and turn the intelligent tester main switch on.
  3. Check the DATA LIST for proper functioning of the stop light switch.

ECM (Cruise control):

ECM (Cruise control)

OK: When the brake pedal is operated, the display changes as shown above.

REPLACE ECM

2 CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH - BATTERY)

CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH - BATTERY)

  1. Disconnect the S12 stop light switch connector.
  2. Measure the voltage according to the value(s) in the table below.

Standard voltage

Standard voltage

3 INSPECT STOP LIGHT SWITCH

INSPECT STOP LIGHT SWITCH

  1. Remove the stop light switch.
  2.  Measure the resistance according to the value(s) in the table below.

Standard resistance

Standard resistance

4 CHECK ECM

CHECK ECM

  1. Reconnect the S12 stop light switch connector.
  2.  Disconnect the E4 connector from the ECM.
  3.  Turn the ignition switch to the ON position.
  4.  Measure the voltage according to the value(s) in the table below.

Standard voltage

Standard voltage

REPLACE ECM

Vehicle Speed Sensor Malfunction
DTC P0500 Vehicle Speed Sensor Malfunction DTC P0503 Vehicle Speed Sensor "A" Intermittent / Erratic / High DESCRIPTION The cruise control system uses the same vehicle speed signal that ...

Stop Light Switch Circuit Malfunction
DTC P0571 Stop Light Switch Circuit Malfunction DESCRIPTION The ECM receives the brake demand signal from the distance control ECU and transmits it to the skid control ECU (brake actuator assembl ...

Other materials:

On-vehicle inspection
HINT: The type of ignition switch on this model differs according to the specifications of the vehicle. For the expressions used in this section, refer to the "EXPRESSIONS OF IGNITION SWITCH" precaution (See page ES-1). 1. CHECK AIR FUEL RATIO COMPENSATION SYSTEM (a) Connect the inte ...

Air outlet control servo motor
ON-VEHICLE INSPECTION 1. INSPECT AIR OUTLET CONTROL SERVO MOTOR (a) Remove the air outlet control servo motor. (b) Connect the positive (+) lead from the battery to terminal 4 and negative (-) lead to terminal 5, then check that the lever turns to "DEF" position. (c) Connect ...

Disassembly
1. Remove park/neutral position switch assembly (A) remove the nut, washer and control shaft lever. (B) using a screwdriver, unstake the nut stopper, and remove the lock nut and nut stopper. (c) Remove the 2 bolts and pull out the park/neutral position switch. 2. REMOVE BREATHER PLUG H ...

В© 2011-2025 Copyright www.tsienna.net