Toyota RAV4 (XA40) 2013-2018 Service Manual: Brake switch "A" / "B" correlation
Description
The stop light switch is a duplex system that transmits two signals: stp and
st1-. These two signals are
used by the ecm to monitor whether or not the brake system is working properly.
If the signals, which
indicate the brake pedal is being depressed and released, are detected
simultaneously, the ecm
interprets this as a malfunction in the stop light switch and sets the dtc.
Hint:
The normal conditions are as shown in the table below. The signals can be
read using the intelligent
tester.
Wiring diagram
Inspection procedure
Hint:
- Read freeze frame data using the intelligent tester. Freeze frame data
records the engine condition
when malfunctions are detected. When troubleshooting, freeze frame data can
help determine if the
vehicle was moving or stationary, if the engine was warmed up or not, if the
air-fuel ratio was lean or
rich, and other data from the time the malfunction occurred.
- Stp signal conditions can be checked using the intelligent tester.
- Connect the intelligent tester to the dlc3.
- Turn the ignition switch on.
- Turn the tester on.
- Select the following menu items: diagnosis / enhanced obd ii / data list
/ primary /
stop light sw.
- Check the stp signal when the brake pedal is depressed and released.
- Check stop light switch assembly (terminal b voltage)
- Disconnect the a3 stop light switch connector.
- Turn the ignition switch on.
- Measure the voltage between the terminals of the a3
stop light switch connector and body ground.
Standard voltage
- Reconnect the stop light switch connector.
- Inspect stop light switch assembly
- Remove the stop light switch.
- Check the resistance.
Standard resistance
- Reinstall the stop light switch.
- Check ecm (stp and st1 - voltage)
- Disconnect the a9 ecm connector.
- Turn the ignition switch on.
- Measure the voltage between the terminals st1- and
stp of the a9 ecm connector and body ground.
standard voltage
- Reconnect the ecm connector.
- Inspect fuse (stop and ign fuse)
- Remove the stop and ign fuses from the instrument
panel junction block.
- Measure the resistance.
Standard resistance:
below 1
- Reinstall the stop and ign fuses.
description
The speed sensor detects the wheel speed and sends the appropriate signals to
the skid control ecu.
The skid control ecu converts these wheel speed signals into a 4-pulse signal ...
Description
The idling speed is controlled by the etcs (electronic throttle control
system). The etcs is comprised
of: 1) the one valve type throttle body; 2) the throttle actuator, which
op ...
Other materials:
Problem symptoms table
When a "normal" code is output during a dtc check but
the problem is still occurring, use the problem symptoms
table. The suspected areas (circuits or parts) for each
problem symptom are in the table. The suspected areas
are listed in order of probability. A description of each of
the ...
Compressor lock sensor circuit
Description
This sensor sends 1 pulse per engine revolution to the air conditioning
amplifier. If the ratio of the
compressor speed divided by the engine speed is smaller than a predetermined
value, the air conditioning
amplifier turns the compressor off, and the indicator blinks at appro ...
Exterior
The shape of the headlights may differ depending on the grade, etc.
Side doors
Locking/unlocking
Opening/closing the side windows
Locking/unlocking by using the key
Warning messages
Back door
Locking/unlocking
Opening from inside the cabin*
Opening from outside
Warning messages
Outs ...