sensor TOYOTA RAV4 1996 Service Owners Manual

DI40Y−01
DI−196
− DIAGNOSTICSAUTOMATIC TRANSAXLE (A540H)
1996 RAV4 (RM447U)
CIRCUIT INSPECTION
DTC P0500 Vehicle Speed Sensor Malfunction
See page DI−94.

Q08776
Shift Solenoid Valve No. 1 and No. 2
(−)(−) (+)(+)
S1 S2
− DIAGNOSTICSAUTOMATIC TRANSAXLE (A540H)
DI−197
1996 RAV4 (RM447U)
DTC P0750, P0755 Shift Solenoid A/B Malfunction
(Shift Solenoid Valve No. 1 / No. 2)
SYSTEM DESCRIPTION
The ECM uses signals from the vehicle speed sensor to detect the actual gear position (1st, 2nd, 3rd or O/D
gear). The ECM then compares the actual gear with the shift schedule in the ECM memory to detect mechan-
ical trouble of the shift solenoid valves and valve body.
DTC No.DTC Detecting ConditionTrouble Area
P0750
P0755During normal driving, gear required by the ECM does not
match actual gear (2 trip detection logic)Shift solenoid valve No. 1 / No. 2 is stuck open or closed
Valve body is blocked up or stuck
HINT:
Check the shift solenoid valve No. 1 when DTC P0750 is output and check shift solenoid valve No. 2 when
DTC P0755 is output.
INSPECTION PROCEDURE
1 Check solenoid valve No. 1 or No. 2 operation.
PREPARATION:
(a) Remove the oil pan.
(b) Remove the shift solenoid valve No. 1 or No. 2.
CHECK:
(a) Applying 490 kPa (5 kgf/cm2, 71 psi) of compressed air,
check that the solenoid valves do not leak air.
(b) When battery positive voltage is supplied to the solenoid
valves, check that solenoid valve open.
NG Replace shift solenoid valve No. 1 or No. 2.
OK
2 Check valve body (See page DI−192).
NG Repair or replace valve body.
OK
Repair or replace transaxle (See page
AX−19).
DI40Z−01

D02258
Drain
Drain Line
Pressure
Q08777
(+)
(+)
(−) (−)
− DIAGNOSTICSAUTOMATIC TRANSAXLE (A540H)
DI−201
1996 RAV4 (RM447U)
DTC P0770 Shift Solenoid E Malfunction
(Shift Solenoid Valve SL)
SYSTEM DESCRIPTION
The ECM uses the signals from the throttle position sensor and
air flow meter to monitor the engagement condition of the lock−
up clutch
Then the ECM compares the engagement condition of the
lock−up clutch with the lock−up schedule in the ECM memory
to detect mechanical trouble of the shift solenoid valve SL,
valve body and torque converter clutch.
DTC No.DTC Detecting ConditionTrouble Area
P0770
Lock−up does not occur when driving in the lock−up range
(normal driving at 80 km/h (50 mph)), or lock−up remains ON
in the lock−up OFF range (2 trip detection logic)Shift solenoid valve SL is stuck open or closed
Valve body blocked up or stuck
Lock−up clutch
INSPECTION PROCEDURE
1 Check shift solenoid valve SL operation.
PREPARATION:
Remove the shift solenoid valve SL from the valve body.
CHECK:
(a) Applying 490 kPa (5 kgf/cm2, 71 psi) of compressed air,
check that the solenoid valve open.
(b) When battery positive voltage is supplied to the solenoid
valve, check that solenoid valve does not leak air.
NG Replace shift solenoid valve SL.
OK
DI411−01

D02263
RotorFront Speed Sensor
NS
ECMFront Speed Sensor
Ring Gear
D02264
0 V
5 V/div
2 mec./division DI−206
− DIAGNOSTICSAUTOMATIC TRANSAXLE (A540H)
1996 RAV4 (RM447U)
DTC P1700 Speed sensor No. 2 Circuit Malfunction
(Front Speed Sensor)
CIRCUIT DESCRIPTION
The front speed sensor detects the vehicle speed based on revolution of the ring gear and sends signals
to the ECM. An AC voltage is generated in the front speed sensor coil as the ring rear mounted on the ring
gear rotates, and this voltage is sent to the ECM.
The center differential clutch is controlled by the ECM based on the signals from the front speed sensor and
rear speed sensor signals.
DTC No.DTC Detecting ConditionTrouble Area
P1700
All condition below are detects 5,400 times or more continu-
ously
(a) No signal from front speed sensor is input to ECM while 4
pulses of rear speed sensor is sent
(b) Vehicle speed: 18 km/h (11 mph) or more for at 4 sec.
(c) Park / neutral position switch:
OFF (Other than P or N position)
Open or short in front speed sensor circuit
Front speed sensor
ECM
Reference:
Wavefrom between terminals FR
+ and FR− when vehicle speed
is approx. 20 km/h (13 mph).
DI414−01

D02265
Front Speed Sensor V3 2
V3
1Y−R
W−R
E47 E48ECM
4 − 6 V
FR
−
FR+
D02266
FR+FR−
− DIAGNOSTICSAUTOMATIC TRANSAXLE (A540H)
DI−207
1996 RAV4 (RM447U)
WIRING DIAGRAM
INSPECTION PROCEDURE
1 Check vehicle speed value or resistance between terminals FR+ and FR− of ECM.
When using OBD II scan tool or TOYOTA hand−held tester:
PREPARATION:
(a) Remove the DLC3 cover.
(b) Connect an OBDII scan tool or TOYOTA hand−held tester
to the DLC3.
(c) Turn the ignition switch ON and OBD II scan tool or TOY-
OTA hand−held tester main switch ON.
CHECK:
Drive the vehicle and read vehicle speed value.
OK:
Vehicle speed matches tester speed value.
When not using OBD II scan tool or TOYOTA hand−held tes-
ter:
CHECK:
Check the resistance between terminals FR+ and FR− of the
ECM.
OK:
Resistance: 560 − 680 Ω
OK Check and replace ECM.
NG

D02267
Magnet1
2
DI−208
− DIAGNOSTICSAUTOMATIC TRANSAXLE (A540H)
1996 RAV4 (RM447U)
2 Check front speed sensor.
PREPARATION:
Remove the front speed sensor from the transaxle.
CHECK:
Measure the resistance between terminals 1 and 2 of the speed
sensor.
OK:
Resistance: 560 − 680 Ω
Reference:
Check the front transaxle revolution sensor’s function
CHECK:
Check the voltage between terminals 1 and 2 of the speed sen-
sor when a magnet is put close to the front end of the front
speed sensor then taken away quickly.
OK:
Voltage is generated intermittently.
HINT:
The generated voltage is extremely low.
NG Replace front speed sensor.
OK
Check and repair harness and connector be-
tween ECM and front speed sensor.

D02268
Rear Speed Sensor
Transfer
Drive
Gear
D02265
Rear Speed Sensor V4 2
1
V4L−Y
R−L
E5E5 14
13
RR
−
RR+
4 − 6 V ECM
− DIAGNOSTICSAUTOMATIC TRANSAXLE (A540H)
DI−209
1996 RAV4 (RM447U)
DTC P1715 Rear Wheel Sensor Circuit Malfunction
(Rear Speed Sensor)
CIRCUIT DESCRIPTION
The rear speed sensor detects the rear wheel speed based on
revolution of the transfer drive gear.
Its construction is the same as that of the front speed sensor
(See page DI−206).
The center differential clutch is controlled by the ECM based on
the signals from the front speed sensor and rear speed sensor
signals.
DTC No.DTC Detecting ConditionTrouble Area
P1715
All conditions below are detected 10 sec. or more
(2 trip detection logic)
(a) No signal rear speed sensor is input to ECM
(b) Vehicle speed: 30 km/h (19 mph) or more
(c) Park / neutral position switch:
OFF (Other than P or N position)
Open or short in rear speed sensor circuit
Rear speed sensor
ECM
WIRING DIAGRAM
DI415−01

D02269
RR+RR−
D02267
12
Magnet
DI−210
− DIAGNOSTICSAUTOMATIC TRANSAXLE (A540H)
1996 RAV4 (RM447U)
INSPECTION PROCEDURE
1 Check resistance between terminals RR+ and RR− of ECM.
CHECK:
Check the resistance between terminals RR+ and RR− of the
ECM.
OK:
Resistance: 560 − 680 Ω
OK Check and replace ECM.
NG
2 Check rear speed sensor.
PREPARATION:
Remove the rear speed sensor from transaxle.
CHECK:
Measure the resistance between terminals 1 and 2 of the revo-
lution sensor.
OK:
Resistance: 560 − 680 Ω
Reference:
Check the vehicle speed sensor’s function
CHECK:
Check the voltage between terminals 1 and 2 of the speed sen-
sor when a magnet is put close to the front end of the rear speed
sensor then taken away quickly.
OK:
Voltage is generated intermittently.
HINT:
The generated voltage is extremely low.
NG Replace rear speed sensor.
OK

− DIAGNOSTICSAUTOMATIC TRANSAXLE (A540H)
DI−211
1996 RAV4 (RM447U)
Check and repair harness and connector be-
tween ECM and rear speed sensor.

D02275
Current flow to solenoid Center
Differential
Control
Pressure
ON
OFF
1 cycleDuty Ratio =
A + B
A
x 100 (%)
− DIAGNOSTICSAUTOMATIC TRANSAXLE (A540H)
DI−215
1996 RAV4 (RM447U)
DTC P1770 Differential Lock Solenoid No. 1 Circuit
Malfunction (Shift Solenoid Valve SLD)
CIRCUIT DESCRIPTION
Shift solenoid valve SLD controls the oil pressure applied to the
center differential clutch and maintains the limited slip differen-
tial effects at most appropriate level.
The ECM determines optimum control pressure according to
the signals from the throttle position sensor, front and rear
transaxle revolution sensor and control volume of current flow
to the shift solenoid valve.
The amount of current flow to the solenoid valve is controlled
by the duty ratio* of the ECM output signal. The higher the duty
ratio becomes, the higher the center differential control pres-
sure becomes during the center differential control operation.
*: Duty Ratio
The duty ratio is the ratio of the period of continuity in one cycle.
For example, if A is the period of continuity in one cycle, and B
is the period of non−continuity, then
DTC No.DTC Detection ConditionTrouble Area
P1770
All conditions below are detected 1 sec. or more
(2 trip detection logic)
(a) SLD output signal’s duty ON of 3.3 msecs. or more with
duty ratio of at least 5 % lasts
(b) B
+ voltage: 11 V or more
Open or short in shift solenoid valve SLD circuit
Shift solenoid valve SLD
ECM
DI417−01