TOYOTA RAV4 1996 Service Repair Manual

A00413
ON
TPC ON OFF
E
F
VSV is ON VSV is OFFFE
G
G E
− DIAGNOSTICSENGINE
DI−91
1996 RAV4 (RM447U)
9 Check the VSV for vapor pressure sensor.
PREPARATION:
(a) Remove side trim cover (See page SF−61).
(b) Turn the ignition switch ON.
CHECK:
Check VSV function
(1) Connect between terminal TPC of ECM and body
ground.
(2) Disconnect between terminal TPC of ECM and
body ground.
OK:
VSV is ON:
Air from pipe E is flowing out through pipe F.
VSV is OFF:
Air from pipe E is flowing out through pipe G.
OK Check and replace charcoal canister
(See page EC−5).
NG
10 Check operation of the VSV for vapor pressure sensor (See page SF−47).
NG Replace VSV.
OK
11 Check for open and short in harness and connector between EFI main relay
(Marking: EFI) and VSV for vapor pressure sensor and ECM (See page IN−30).
NG Repair or replace harness or connector.
OK
Check and replace ECM (See page IN−30).

S00042
VSV
for EVAPECM
Vapor Pressure
VSV for Vapor
Pressure Sensor
Charcoal Canister Fuel Tank DI−92
− DIAGNOSTICSENGINE
1996 RAV4 (RM447U)
DTC P0450 Evaporative Emission Control System
Pressure Sensor Malfunction
CIRCUIT DESCRIPTION
The vapor pressure sensor and VSV for vapor pressure sensor are used to detect abnormalities in the evap-
orative emission control system.
The ECM decides whether there is an abnormality in the evaporative emission control system based on the
vapor pressure sensor signal.
DTC P0450 is recorded by the ECM when the vapor pressure sensor malfunction.
DTC No.DTC Detecting ConditionTrouble Area
P0450
Condition (a) or (b) continues.
(2 trip detection logic)
(a) PTNK < 0.5 V
(b) PTNK > 4.5 VOpen or short in vapor pressure sensor circuit
Vapor pressure sensor
ECM
WIRING DIAGRAM
Refer to Evaporative Emission Control System Malfunction on page DI−76.
DI3ZY−01

− DIAGNOSTICSENGINE
DI−93
1996 RAV4 (RM447U)
INSPECTION PROCEDURE
HINT:
If DTC P0441, P0446 or P0450 is output after DTC P0440, first troubleshoot DTC P0441, P0446 or P0450.
If no malfunction is detected, troubleshoot DTC P0440 next.
1 Check voltage between terminals VC and E2 of ECM connector
(See page DI−76, step 9).
NG Check and replace ECM (See page IN−30).
OK
2 Check voltage between terminals PTNK and E2 of ECM connector
(See page DI−76, step 10).
OK Check and replace ECM (See page IN−30).
NG
3 Check for open and short in harness and connector between the vapor pressure
sensor and ECM (See page IN−30).
NG Repair or replace harness or connector.
OK
Replace the vapor pressure sensor.

Q00515
4−pulse 4−pluse
ECM Combination
Meter No.1 Vehicle
Speed Sensor
Transaxle DI−94
− DIAGNOSTICSENGINE
1996 RAV4 (RM447U)
DTC P0500 Vehicle Speed Sensor Malfunction
CIRCUIT DESCRIPTION
The No.1 vehicle speed sensor outputs a 4−pulse signal for every revolution of the rotor shaft, which is ro-
tated by the transmission output shaft via the driven gear. After this signal is converted into a more precise
rectangular waveform by the waveform shaping circuit inside the combination meter, it is then transmitted
to the ECM. The ECM determines the vehicle speed based on the frequency of these pulse signals.
DTC No.DTC Detecting ConditionTrouble Area
P0500
No vehicle speed sensor signal to ECM under the following
conditions:
(2 trip detection logic)
For A/T:
(a) Park / neutral position switch is OFF
(b) Vehicle is being driven
For M/T:
(a) Engine speed is between 2,000 rpm and 5,000 rpm
(b) Vehicle is being driven at 88 km/h (54 mph) or more
Open or short in vehicle speed sensor circuit
Vehicle speed sensor
Combination meter
ECM
DI3ZZ−01

A04252
C9V−W
E6ECM
SPD5 V
2
9 Combination Meter
− DIAGNOSTICSENGINE
DI−95
1996 RAV4 (RM447U)
WIRING DIAGRAM
INSPECTION PROCEDURE
1 Check operation of speedometer.
CHECK:
Drive the vehicle and check it the operation of the speedometer in the combination meter is normal.
HINT:
The vehicle speed sensor is operating normally if the speedometer display is normal.
NG Check speedometer circuit. See combination
meter troubleshooting.
OK

A00415
SPD
(+)
ON
AT7809
4.5 − 5.5 V
Turn the wheel
0
DI−96
− DIAGNOSTICSENGINE
1996 RAV4 (RM447U)
2 Check voltage between terminal SPD of ECM connector and body ground.
PREPARATION:
(a) Remove side trim cover (See page SF−62).
(b) Shift the shift lever to neutral.
(c) Jack up one of the front wheels
(d) Turn ignition switch ON.
CHECK:
Measure voltage between terminal SPD of ECM connector and
body ground when the wheel is turned slowly.
OK:
Voltage is generated intermittently.
NG Check and repair harness and connector be-
tween combination meter and ECM.
OK
Check and replace ECM (See page IN−30).

P01559
From
Air
CleanerThrottle valve
Signals
Valve IAC Valve
To Cylinders ECM
Intake
Air
Chamber
− DIAGNOSTICSENGINE
DI−97
1996 RAV4 (RM447U)
DTC P0505 Idle Control System Malfunction
CIRCUIT DESCRIPTION
The rotary solenoid type IAC valve is located on the throttle
body and intake air bypassing the throttle valve is directed to
the IAC valve through a passage.
In this way the intake air volume bypassing the throttle valve is
regulated, controlling the engine speed.
The ECM operates only the IAC valve to perform idle−up and
provide feedback for the target idling speed.
DTC No.DTC Detecting ConditionTrouble Area
P0505Idle speed continues to vary greatly from the target speed
(2 trip detection logic)
IAC valve is stuck or closed
Open or short in IAC valve circuit
Open or short IAC signal circuit
Air intake (hose loose)
DI400−01

S02401
6
66 6 5
2 13R/B No.6
From Battery
Fuse Block
1J
1E
B−O11 1
2
From
IG SwitchECM
ISCO
ISCC E4
E4 B−L
B−Y10
9 IAC Valve
EA12
2
B−R B−R
W−B W−B
EA J1
Junction Connector
AA EFI Main Relay R−W
IGNE01
E01
J/B No.13 1
10 B−O
DI−98
− DIAGNOSTICSENGINE
1996 RAV4 (RM447U)
WIRING DIAGRAM
INSPECTION PROCEDURE
1 Check air induction system (See page EC−5).
NG Repair or replace.
OK
2 Check A/C signal circuit (See page AC−64).
NG Repair or replace.
OK
3 Check voltage between terminals ISCO, ISCC of ECM connector and body
ground.

A00416
ISCO
(+)
E4
ConnectorISCC
(+)ON
− DIAGNOSTICSENGINE
DI−99
1996 RAV4 (RM447U)
PREPARATION:
(a) Remove side trim cover (See page SF−61).
(b) Disconnect the E4 connector of ECM.
(c) Turn ignition switch ON.
CHECK:
Measure voltage between terminals ISCO, ISCC of ECM con-
nector and body ground.
OK:
Voltage: 9 − 14 V
OK Go to step 5.
NG
4 Check IAC valve (See page SF−34).
NG Replace IAC valve.
OK
Check for open and short in harness and con-
nector between R/B No.6 and IAC valve, IAC
valve and ECM (See page IN−30).
5 Check operation of the IAC valve (See page SF−34).
NG Repair or replace IAC valve.
OK
Check and replace ECM (See page IN−30).

S07638
IG1
1H 1DI4I4
E4
E43 20
EA17
IG111
2221
20 8
1412
67
2
W B−WB−RB−R B−W
B−W
B−W
B−W
L−Y 4
53
2
1 Tr2
Igniter To Tachometer Distributor
BatteryFusible Link BlockR/B No.2
B−R IG Switch 4ECM
IGT
IGF5V
Tr1
AM2B
B−Y
Ignition Coil
J/B No.1
MAIN DI−100
− DIAGNOSTICSENGINE
1996 RAV4 (RM447U)
DTC P1300 Igniter Circuit Malfunction
CIRCUIT DESCRIPTION
This ECM determines the ignition timing, turns on Tr1 at a predetermined angle (°CA) before the desired
ignition timing and outputs an ignition signal (IGT) ”1” to the igniter.
Since the width of the IGT signal is constant, the dwell angle control circuit in the igniter determines the time
the control circuit starts primary current flow to the ignition coil based on the engine rpm and ignition timing
one revolution ago, that is, the time the Tr
2 turns on.
When it reaches the ignition timing, the ECM turns Tr
1 off and outputs the IGT signal ”O”.
This turns Tr
2 off, interrupting the primary current flow and generating a high voltage in the secondary coil
which causes the spark plug to spark. Also, by the counter electromotive force generated when the primary
current is interrupted, the igniter sends an ignition confirmation signal (IGF) to the ECM.
The ECM stops fuel injection as a fail safe function when the IGF signal is not input to the ECM.
DTC No.DTC Detecting ConditionTrouble Area
P1300No IGF signal to ECM for 8 consecutive IGT signals during
engine running.Open or short in IGF or IGT circuit from igniter to ECM
Igniter
ECM
WIRING DIAGRAM
DI401−01