1996 TOYOTA RAV4 Engine

A00411
Engine
VSV for
Vapor Pressure
VSV for
EVAP
OFF OFF
ON Stop
ONStart
5 sec. 5 sec.
PTNK
(+)E2
(−)
DI−88
− DIAGNOSTICSENGINE
1996 RAV4 (RM447U)
14 Check the charcoal canister.
PREPARATION:
(a) Connect the TOYOTA hand−held tester to the DLC3.
(b) Remove the fuel rank cap.
(c) Disconnect the VSV connector for vapor pressure sensor.
(d) Select the ACTIVE TEST mode on the TOYOTA hand−
held tester.
(e) Remove side trim cover (See page SF−61).
(f) Start the engine.
(g) VSV for EVAP is ON by TOYOTA hand−held tester and
remains on for 5 sec.
CHECK:
Measure voltage between terminals PTNK and E2 of ECM con-
nector 5 secs. after switching VSV for EVAP from ON to OFF.
OK:
Voltage: 2.5 V or less
NG Replace charcoal canister.
OK
Check and replace ECM (See page IN−30).
OBDII scan tool (excluding TOYOTA hand−held tester)
1 Check the VSV connector for EVAP, VSV connector for vapor pressure sensor
and vapor pressure sensor connector for looseness and disconnection.
NG Repair or connect the VSV or sensor connector.
OK
2 Check the vacuum hose between intake manifold and VSV for EVAP,VSV for
EVAP and charcoal canister, charcoal canister and VSV for vapor pressure sen-
sor, and VSV for vapor pressure sensor and vapor pressure sensor.
CHECK:
(a) Check that the vacuum hose is connected correctly.
(b) Check the vacuum hose for looseness and disconnection.

− DIAGNOSTICSENGINE
DI−89
1996 RAV4 (RM447U)
(c) Check the vacuum hose for cracks, hole, damage and blockage.
NG Repair or replace.
OK
3 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
4 Check voltage between terminals PTNK and E2 of ECM connector
(See page DI−76, step 10).
OK Go to step 6.
NG
5 Check for open and short in harness and connector between vapor pressure
sensor and ECM (See page IN−30).
NG Repair or replace harness or connector.
OK
Replace vapor pressure sensor.

A00412
ON
EVP
ONOFF
E
F
VSV is ON VSV is OFFFE
DI−90
− DIAGNOSTICSENGINE
1996 RAV4 (RM447U)
6 Check the VSV for EVAP.
PREPARATION:
(a) Remove side trim cover (See page SF−61).
(b) Turn the ignition switch ON.
CHECK:
Check VSV function.
(1) Connect between terminal EVP of ECM and body
ground.
(2) Disconnect between terminal EVP of ECM and
body ground.
OK:
(1) VSV is ON:
Air from pipe E is following out through pipe F.
(2) VSV is OFF:
Air does not flow from pipe E to pipe F.
OK Go to step 9.
NG
7 Check operation of the VSV for EVAP (See page SF−43).
NG Replace VSV.
OK
8 Check for open and short in harness and connector between EFI main relay
(Marking: EFI MAIN) and VSV for EVAP and ECM (See page IN−30).
NG Repair or replace harness or connector.
OK
Check and replace ECM (See page IN−30).

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