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 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

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 connector from the stop light switch.
  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

  1. Install the stop light switch.

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 Circuit Malfunction DESCRIPTION The cruise control system uses the same vehicle speed signal that is sent to the ECM for ...

Input Signal Circuit Malfunction
DTC P0607 Input Signal Circuit Malfunction DESCRIPTION This DTC indicates internal abnormalities of the ECM. DTC No. Detection Item Trouble Area P0607 The E ...

Other materials:

Reassembly
1. INSTALL IGNITION OR STARTER SWITCH ASSEMBLY (a) Install the ignition or starter switch assembly to the steering column bracket assembly UPR with the 2 screws. 2. INSTALL KEY INTER LOCK SOLENOID (a) Install the solenoid to the steering column bracket assembly with the 2 screws. 3. INSTALL ...

Hitch
Trailer hitch assemblies have different weight capacities. Toyota recommends the use of Toyota hitch/bracket for your vehicle. For details, contact your Toyota dealer. If you wish to install a trailer hitch, contact your Toyota dealer. Use only a hitch that conforms to the gross trailer w ...

Drive shaft
SST RECOMMENDED TOOLS HINT: Torx is a registered trademark of Textron Inc. EQUIPMENT LUBRICANT ...

В© 2011-2024 Copyright www.tsienna.net