TOYOTA RAV4 2006 Service Repair Manual

GF1A TRANSFER – ACTIVE TORQUE CONTROL 4WD SYSTEMTF–13
TF
TEST MODE PROCEDURE
1. DESCRIPTION
HINT:
When using a chassis dynamometer, brake tester, etc. to
perform a vehicle test, activate test mode to avoid a
"different tire diameter installed" incorrect judgment.
Test mode does not have a 4WD parameter. Test mode
is activated because it will prohibit a different tire
diameter judgment.
2. ACTIVATE TEST MODE
HINT:
Activate test mode before using a chassis dynamometer,
brake tester, etc. to perform a vehicle test.
(a) Check that the ignition switch is OFF.
(b) Use either of the following methods to change the
4WD ECU to test mode.
(1) Test mode activation through intelligent tester
(with CAM VIM).
• Connect the intelligent tester (with CAM VIM)
to the DLC3 connector and turn the ignition
switch ON. Using the test mode activation
function (mode 10), activate test mode.
(2) Test mode activation by shorting TS terminal
• With the ignition switch OFF, short-circuit the
TS and CG terminals of the DLC3 connector.
Then turn the ignition switch ON to activate
test mode.
NOTICE:
When the ignition switch is turned from
OFF to ON, the 4WD indicator light will
illuminate for 4 seconds. Then it will turn
off.
4WD Lock Mode indicator
HINT:
When the ignition switch is ON and the 4WD
lock switch is turned from OFF to ON, the
4WD lock mode indicator blinks twice and
then illuminates.
If the indicator does not illuminate, check the
bulb for burnout. Also, inspect the wire
harness between the 4WD ECU and
combination meter.
Control Status 4WD Control Status
During test mode Different tire diameter malfunction judgment (detection that tire
diameter of 4 wheels are not same) is not performed.
Other than above item, normal control is performed.
- 4WD lock switch OFF (4WD auto mode status)
- 4WD lock switch ON (4WD lock mode status)
4WD Lock Switch OFF Illuminates for 4 seconds, then turns
OFF
4WD Lock Switch ON Remains illuminated

TF–14GF1A TRANSFER – ACTIVE TORQUE CONTROL 4WD SYSTEM
TF
NOTICE:
If a part of the 4WD system has a defect, the
4WD indicator light will illuminate.
(c) Check if the 4WD indicator light has changed to the
test mode display.
(d) Start the engine.
3. CONFIRM MODE CHANGE
HINT:
Operate the 4WD lock switch, and check that the 4WD
control mode changes.
C128629E01
4WD Lock Switch Status 4WD Lock Mode Indicator Status 4WD Control Status
OFF Turns off 4WD auto mode
ON Illuminates 4WD lock mode
Switch changed from OFF to ON Blinks twice, then illuminates At moment of illumination, changes to 4WD
lock mode

GF1A TRANSFER – ACTIVE TORQUE CONTROL 4WD SYSTEMTF–15
TF
PROBLEM SYMPTOMS TABLE
HINT:
• Use the table below to help determine the cause of the
problem symptom. The potential causes of the symptoms
are listed in order of probability in the "Suspected area"
column of the table. Check each symptom by checking the
suspected areas in the order they are listed. Replace parts
as necessary.
• Inspect the fuses and relays related to this system before
inspecting the suspected areas below.
Active torque control 4WD system
HINT:
*:When driving 4WD mode, the vehicle is hard to turn, as if
the brakes were applied, due to the rotational difference
between the front and rear tires while turning.
Symptom Suspected area See page
Phenomenon of tight-corner braking*1.Steering angle sensor circuitTF-27
2.Linear solenoid circuitTF-30
3.4WD control ECU
4WD indicator light remains ON 4WD indicator light circuitTF-36
4WD indicator light does not come ON 4WD indicator light circuitTF-40
The system is in the DTC output mode although
terminals TC and CG of the DLC3 are not short
circuited1.TC and CG terminal circuitTF-42
2.4WD indicator light circuit
The system is not in the DTC output mode although
terminals TC and CG of the DLC3 are not short
circuited1.TC and CG terminal circuitTF-42
2.4WD indicator light circuit

TF–16GF1A TRANSFER – ACTIVE TORQUE CONTROL 4WD SYSTEM
TF
TERMINALS OF ECU
1. CHECK 4WD CONTROL ECU
(a) Measure the voltage and resistance of the
connector.
If the result is not as specified, the 4WD control
ECU may have a malfunction.
(b) Using an oscilloscope, check the waveform 1.
Waveform 1 (Reference)
G032017E06
Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
CANH (E57-14) - CANL
(E57-16)P - W CAN communication Ignition switch OFF 54 to 69
GND (E57-23) - Body
groundW-B - Body ground Ground Always Below 1
4WDL (E57-7) - Body
groundR - W-B Ground 4WD lock mode switch ON Below 1
IG1 (E57-11) - GND (E57-
23)L - W-B Power source voltage Ignition switch ON 10 to 14 V
SLC+ (E57-13) - SLC-
(E57-32)W - B 4WD linear solenoid signal Ignition switch ON Pulse generation (See
waveform 1)
BSLC (E57-9) - GND
(E57-23)R - W-B Power source voltage Ignition switch ON 10 to 14 V
C065158E02
Symbols (Terminal No.) Content
Tool setting 5 V/DIV., 2 msec. / DIV.
Vehicle condition Engine stop, ignition switch ON

GF1A TRANSFER – ACTIVE TORQUE CONTROL 4WD SYSTEMTF–17
TF
DIAGNOSIS SYSTEM
1. DESCRIPTION
Active torque control 4WD system data can be read in
the Data Link Connector 3 (DLC3) of the vehicle. When
the system seems to be malfunctioning, use the
intelligent tester (with CAN VIM) to check for
malfunctions and perform repairs. Therefore when there
seems to be a problem with the active torque control
4WD, use the intelligent tester (with CAN VIM) or SST to
check and troubleshoot it.
SST 09843-18040
2. CHECK DLC3
(a) The ECU uses CAN (ISO11898-1) and ISO9141-2
for communication protocol. The terminal
arrangement of the DLC3 complies with SAE J1962
and matches the ISO9141-2 format.
Verify the conditions listed in the table below.
NOTICE:
*: Before measuring the resistance, leave the
vehicle as is for at least 1 minute and do not
operate the ignition switch, other switches or
the doors.
If the result is not as specified, the DLC3 may have
a malfunction. Repair or replace the harness and
connector.
HINT:
Connect the cable of the intelligent tester (with CAN
VIM) to the DLC3, turn the ignition switch ON and
attempt to use the tester. If the display indicates that
a communication error has occurred, there is a
problem either with the vehicle or with the tester.
• If communication is normal when the tester is
connected to another vehicle, inspect the DLC3
of the original vehicle.
H100769E16
Symbols (Terminal No.) Terminal Description Condition Specified Condition
SIL (7) - SG (5) Bus + line During transmission Pulse generation
CG (4) - Body Ground Chassis ground Always Below 1
SG (5) - Body Ground Signal ground Always Below 1
BAT (16) - Body Ground Battery positive Always 11 to 14 V
CANH (6) - CANL (14) HIGH-level CAN bus line Ignition switch OFF* 54 to 69
CANH (6) - BAT (16) HIGH-level CAN bus line Ignition switch OFF* 1 M or higher
CANH (6) - CG (4) HIGH-level CAN bus line Ignition switch OFF* 200
or higher
CANL (14) - BAT (16) LOW-level CAN bus line Ignition switch OFF* 1 M
or higher
CANL (14) -CG (4) LOW-level CAN bus line Ignition switch OFF* 200
or higher

TF–18GF1A TRANSFER – ACTIVE TORQUE CONTROL 4WD SYSTEM
TF
• If communication is still not possible when the
tester is connected to another vehicle, the
problem may be in the tester itself. Consult the
Service Department listed in the tester's
instruction manual.
3. INDICATOR LIGHT
(a) When a problem occurs in the active torque control
4WD system, the 4WD indicator light on the
combination meter comes ON to inform the driver of
the problem.
DTC CHECK / CLEAR
1. CHECK DTC (When Using Intelligent Tester)
(a) Check the DTCs.
(1) Connect the intelligent tester (with CAN VIM) to
the DLC3.
(2) Turn the ignition switch ON.
(3) Read the DTCs by following the prompts on the
tester screen.
HINT:
Refer to the intelligent tester (with CAN VIM)
operator's manual for further details.
2. CLEAR DTC (When Using Intelligent Tester)
(a) Connect the intelligent tester (with CAN VIM) to the
DLC3.
(b) Turn the ignition switch ON.
(c) Operate the intelligent tester (with CAN VIM) to
clear the codes.
HINT:
Refer to the intelligent tester (with CAN VIM)
operator's manual for further details.
3. CHECK DTC (When not Using Intelligent Tester)
(a) Check the DTCs.
(1) Using the SST, connect terminals TC (13) and
CG (4) of the DLC3
SST 09843-18040
(2) Turn the ignition switch ON.
C128618E02
B127989E01
H100769E10

GF1A TRANSFER – ACTIVE TORQUE CONTROL 4WD SYSTEMTF–19
TF
(3) Read DTCs from the 4WD indicator light ON the
combination meter.
HINT:
• If the 4WD indicator light does not blink,
perform relevant troubleshooting procedures.
The relevant troubleshooting procedures are
in the sections listed in the table below.
• If more than 1 DTC is detected at the same
time, the DTCs will be displayed in numerical
order.
• As an example, the blinking patterns of the
normal system code and DTCs 11 and 21 are
shown below.
• DTCs are explained in "DIAGNOSTIC
TROUBLE CODE CHART" (see page TF-19).
4. CLEAR DTC (When not Using Intelligent Tester)
(a) Using SST, connect terminals 13 (TC) and 4 (CG) of
the DLC3.
SST 09843-18040
(b) Turn the ignition switch ON.
(c) Clear the DTCs stored in the 4WD control ECU by
depressing the brake pedal 8 times or more within 5
seconds.
(d) Check that the warning light blinks in the normal
system code pattern.
(e) Remove SST from the terminals of the DLC3.
(f) Turn the ignition switch OFF.
HINT:
DTCs cannot be cleared by disconnecting the cable
from the negative (-) battery terminal or removing
the ECU-IG1 fuse.
C108860E08
Section Title See Procedure
4WD Indicator Light does not Come ONTF-40
TC and CG Terminal CircuitTF-42
C108863

TF–20GF1A TRANSFER – ACTIVE TORQUE CONTROL 4WD SYSTEM
TF
FAIL-SAFE CHART
1. FAIL-SAFE FUNCTION
• If following malfunctions occur, the 4WD control ECU
will stop the function of 4WD control system or partly
change the function to control the system.
• If a malfunction occurs in the sensor signal or
actuator, the flow of electricity to the linear solenoid of
the electrical coupling is prohibited. As a result, the
system enters front wheel drive condition.
• When a component of the system malfunctions and
the fail-safe function activates, the component
operation is prohibited. However, if the system is
controlling the component and the fail-safe function
activates, the system operation is gradually stopped
to prevent sudden changes in the vehicle condition.
• When system control is not possible, the warning light
is illuminated to stop operation of the system
operation.

GF1A TRANSFER – ACTIVE TORQUE CONTROL 4WD SYSTEMTF–21
TF
DATA LIST / ACTIVE TEST
1. READ DATA LIST
HINT:
Using the intelligent tester's (with CAN VIM) DATA LIST
allows switch, sensor and other item values to be read
without removing any parts. Reading the DATA LIST
early in troubleshooting is one way to save time.
(a) Connect the intelligent tester (with CAN VIM) to the
DLC3.
(b) Turn the ignition switch ON.
(c) Read the DATA LIST according to the display on the
tester.
4WD control ECU
Item Measurement Item/Range
(Display)Normal Condition Diagnostic Note
4WD WARN LAMP 4WD indicator light /OFF or ON OFF: 4WD indicator light OFF
ON: 4WD indicator light ON-
SLIP INDI LAMP Slip indicator light /OFF or ON OFF: SLIP indicator light OFF
ON: SLIP indicator light ON-
STOP LAMP SW Stop light switch /OFF or ON OFF: Brake pedal released
ON: Brake pedal depressed-
STEERING ANGLE Steering angle value /
Min.: -3276.8 deg
Max.: 3276.7 degMin.: -3276.8 deg
Max.: 3276.7 deg-
FR WHEEL SPD FR wheel speed /
Min.: 0 km/h (0 mph)
Reading : Max.: 326.4 km/h
(202.8 mph)Actual wheel speed Almost no difference from the
speedometer
FL WHEEL SPD FL wheel speed /
Min.: 0 km/h (0 mph)
Reading : Max.: 326.4 km/h
(202.8 mph)Actual wheel speed Almost no difference from the
speedometer
RR WHEEL SPD RR wheel speed /
Min.: 0 km/h (0 mph)
Reading : Max.: 326.4 km/h
(202.8 mph)Actual wheel speed Almost no difference from the
speedometer
RLWHEEL SPD RL wheel speed /
Min.: 0 km/h (0 mph)
Reading : Max.: 326.4 km/h
(202.8 mph)Actual wheel speed Almost no difference from the
speedometer
AMBI TEMP Ambient temperature /
Min.: -128
C (198.4 F)
Max.: 127 C (260.6 F)Min.: -128 (198.4
F)
Max.: 127 (260.6
F)-
COOLANT TEMP Engine coolant temperature /
Min.: 0
C (32 F)
Max.: 127.5
C (261.5 F)Min.: 0
C (32 F)
Max.: 127.5 C (261.5 F)-
LOCK SW 4WD lock switch / OFF or ON OFF: 4WD lock switch off
ON: 4WD lock switch on-
SLC CUR SLC solenoid (4WD linear
solenoid) current /
Min.: 0 A
Max.: 3 AMin.: 0 A
Max.: 3 A-

TF–22GF1A TRANSFER – ACTIVE TORQUE CONTROL 4WD SYSTEM
TF
2. PERFORM ACTIVE TEST
HINT:
Performing the intelligent tester's (with CAN VIM)
ACTIVE TEST allows switch and other items to be
operated without removing any parts. Performing the
ACTIVE TEST early in troubleshooting is one way to
save time. The DATA LIST can be displayed during the
ACTIVE TEST.
(a) Connect the intelligent tester (with CAM VIN) to the
DLC3.
(b) Turn the ignition switch ON.
(c) Perform the ACTIVE TEST according to the display
on the tester.
4WD control ECU
Skid control ECU
Item Test Details Diagnostic Note
4WD WARN LAMP 4WD indicator light ON / OFF
ON: 4WD indicator light ON
OFF: 4WD indicator light OFFObserve combination meter
LOCK LAMP 4WD lock light / ON / OFF
OFF: 4WD lock switch OFF
ON: 4WD lock switch ONObserve combination meter
Item Test Details Diagnostic Note
SLIP INDI LAMP SLIP indicator Light / ON / OFF
ON: SLIP indicator light ON
OFF: SLIP indicator light OFFObserve combination meter