1996 TOYOTA RAV4 Service Repair Manual

N14134
ECU−IGJ/B No. 1
− DIAGNOSTICSANTI−LOCK BRAKE SYSTEM
DI−265
1996 RAV4 (RM447U)
4 Check ECU−IG fuse.
PREPARATION:
Remove the ECU−IG fuse from the J/B No. 1.
CHECK:
Check the continuity of the ECU−IG fuse.
OK:
Continuity
NG Check for short in all harness and components
connected to ECU−IG fuse.
OK
Check for open in harness and connector be-
tween ABS ECU and battery (See page
IN−30).

DI−266
− DIAGNOSTICSANTI−LOCK BRAKE SYSTEM
1996 RAV4 (RM447U)
DTC 43, 45 Malfunction is Deceleration Sensor
(4WD Models)
CIRCUIT DESCRIPTION
DTC No.DTC Detecting ConditionTrouble Area
43
Either of the following 1 or 2 is detected:
1. After the battery terminal is connected, input from the decel-
eration sensor does not charge at one cycle (0 km/h →
more than 30 km/h → 0 km/h) for 16 times continuously
2. When the brake pedal is not depressed at vehicle speed of
5 km/h or more, forward and backward G (more than 0.4 G)
is detected for 30 sec. or more
Deceleration sensor
Wire harness for deceleration sensor system
ECU
*45
At vehicle speed of 30 km/h or more, the deceleration sensor
output and vehicle acceleration from wheel speed remain ab-
normally different for 60 sec. or moreDeceleration sensor
Wire harness for deceleration sensor system
INSPECTION PROCEDURE
1 Check deceleration sensor (See page DI−234).
NG Replace deceleration sensor.
OK
2 Check for open or short in harness and connector between sensor and ECU (See
page IN−30).
NG Repair or replace harness and connector.
OK
Check and replace ABS ECU.
DI41P−02

W01940
− DIAGNOSTICSANTI−LOCK BRAKE SYSTEM
DI−267
1996 RAV4 (RM447U)
DTC 44 Deceleration Sensor Circuit (4WD Models)
CIRCUIT DESCRIPTION
This sensor detects deceleration on the vehicle. The sensor signal is used in ABS control. If the sensor func-
tions abnormally, the ABS warning light comes on but the ABS still operates.
DTC No.TC Detecting ConditionTrouble Area
44
Either of the following 1 or 2 is detected:
1. G switch ON and output voltage of GL1 or GL2 remains 0.5
V or less or 4.5 V or more for more than 1.2 sec.
2. At vehicle speed of 0 km/h, outputs of GL1 and of GL2 re-
mains abnormally different for 60 sec. or more
3. IG switch ON and VGS  4.4 V, VGS  5.5 V continues
for 1.2 sec. or more
Deceleration sensor
Open or short in deceleration sensor circuit
ECU
WIRING DIAGRAM
INSPECTION PROCEDURE
1 Check for open and short in harness and connector between sensor and ECU
(See page IN−30).
NG Repair or replace harness or connector.
OK
DI98Y−01

BE6653
R15784F15319
GL1VGS GL2 (+)
(−)ON
DI−268
− DIAGNOSTICSANTI−LOCK BRAKE SYSTEM
1996 RAV4 (RM447U)
2 Check voltage between terminals GL1, GL2, VGS of ECU and body ground.
PREPARATION:
(a) Remove the ABS ECU with connectors still connected.
(b) Disconnect the sensor connector.
(c) Turn the ignition switch ON.
4 Door Models:
CHECK:
Measure the voltage between terminals GS1, GS2, VGS of the
ECU and body ground.
OK:
Voltage:
GS1, GL2: 0.5 − 4.5 V
VGS: 4.5 − 5.5 V
NG Check and replace ABS ECU.
OK
Check and replace deceleration sensor.

W01937
2
29 10
6 WA8
A9
A9
A8A9
A7 A7
2 25
4 L
R 2
6
A9 A8A84
3
1
A17
A16 A16
A17 A17 A16
*
1*2
15 8
18 5
11 16
98 3
5 A7
A7 EA
EBA71
W−B ALTW−BR−B
R−W
R−L
ABS ActuatorABS ECU Solenoid
RelayABS ECU
MR
R−*1
R+*2
SR
AST
MT BatteryW−R
A17
A17A16
A16 W−BW−BW−R
W−R
ABS1
W−B
ABS Control Relay
Motor
Relay
DLC1
*
1: 2WD Models
*2: 4WD Models
F7
Fusible
Link
Block
G−W
L−O R/B
No. 24 7
− DIAGNOSTICSANTI−LOCK BRAKE SYSTEM
DI−269
1996 RAV4 (RM447U)
DTC 51 ABS Pump Motor Lock
CIRCUIT DESCRIPTION
DTC No.DTC Detecting ConditionTrouble Area
51Pump motor is not operating normally during initial checkABS pump motor
Fail safe function:
If trouble occurs in the ABS pump motor, the ECU cuts off current to the ABS control (solenoid) relay and
prohibits ABS control.
WIRING DIAGRAM
DI41S−03

W01939
W
1D
1K
21D
1F 74
4 2
9
1
6
W1E
1A
IB2 A16
A17
A1713 14
211 213
*
2*1
1 6 6 13 12 B−Y
B−YB−Y
GND
GND IG1
W−B
ALT F7
Fusible
Link
Block
BatteryJ/B No. 1
J/B No. 1ECU−IG IG Switch
J/B No. 1
ABS ECU
R/B No. 2
A17
A17 A17 2
W−B
EB
B−Y
*
1: 2WD models
*2: 4WD models B−Y
AM1
W DI−270
− DIAGNOSTICSANTI−LOCK BRAKE SYSTEM
1996 RAV4 (RM447U)
DTC Always ON Malfunction in ECU
IG Power Source Circuit (2WD Models)
CIRCUIT DESCRIPTION
This is the power source for the ECU, hence the CPU, and the actuators.
DTC No.DTC Detecting ConditionTrouble Area
Always ONVoltage of ECU terminal IG1 remains at more than 17 V
Battery
IC regulator
Open or short in power source circuit
ECU
Fail safe function:
If trouble occurs in the power source circuit, the ECU cuts off current to the ABS control (solenoid) relay and
prohibits ABS control.
WIRING DIAGRAM
DI41T−02

− DIAGNOSTICSANTI−LOCK BRAKE SYSTEM
DI−271
1996 RAV4 (RM447U)
INSPECTION PROCEDURE
1 Is DTC output?
Check DTC on page DI−234.
YES Repair circuit indicated by code output.
NO
2 Is normal code displayed?
YES Check ABS solenoid relay. Check for short in
harness and connector between ABS solenoid
relay and DLC1 (See page IN−30).
NO
3 Is ABS warning light go off?
YES Check for open or short in harness and connec-
tor between ECU−IG Fuse and ECU (See page
IN−30).
NO
4 Check battery positive voltage.
PREPARATION:
Start the engine.
CHECK:
Check the battery positive voltage.
OK:
Voltage: 10 − 16 V
NG Check and repair charging system.
OK

DI−272
− DIAGNOSTICSANTI−LOCK BRAKE SYSTEM
1996 RAV4 (RM447U)
5 Check ABS warning light.
PREPARATION:
(a) Turn the ignition switch OFF.
(b) Disconnect the connector from the ABS ECU.
(c) Turn the ignition switch ON.
CHECK:
Check the ABS warning light goes off.
OK Check and replace ABS ECU.
NG
Check for short in harness and connector between combination meter and ABS ECU, and com-
bination meter and DLC1 (See page IN−30).