check engine TOYOTA RAV4 1996 Service Manual Online

S00048
Pressure
− DIAGNOSTICSENGINE
DI−81
1996 RAV4 (RM447U)
NG Repair or replace harness or connector.
OK
Replace vapor pressure senor.
12 Check the fuel tank for cracks and damage.
PREPARATION:
(a) Disconnect the vacuum hose from charcoal canister.
(b) Correctly install the fuel tank cap.
(c) Apply a pressure of 5 kPa (0.05 kgf/cm
2, 0.71 psi) to the
fuel tank.
CHECK:
Check whether the pressure is maintained after 1 minute.
OK:
Pressure applied to the fuel tank is maintained.
NG Replace fuel tank.
OK
It is likely that the vehicle user did not properly close the fuel tank cap. Please explain to the cus-
tomer how to properly install the fuel tank cap.

− DIAGNOSTICSENGINE
DI−83
1996 RAV4 (RM447U) DTC No..
DTC Detecting ConditionTrouble Area
P0441
The pressure in the charcoal canister does not drop during
purge control
(2 trip detection logic)
Open or short in VSV circuit for vapor pressure sensor
VSV for vapor pressure sensor
Open or short in vapor pressure sensor circuit
Vapor pressure sensor
Open or short in VSV circuit for EVAP
VSV for EVAP
Vacuum hose cracks, hole, blocked, damaged or discon-
nected ( (1), (4), (5) and (6) in fig. 1 )
Charcoal canister cracks, hole or damaged
During purge cut−off, the pressure in the charcoal canister is
very low compared with atmospheric pressure
(2 trip detection logic)
P0446
When VSV for vapor pressure sensor is OFF, ECM judges that
there is no continuity between vapor pressure sensor and
charcoal canister
(2 trip detection logic)
When VSV for vapor pressure sensor is ON, ECM judges that
there is no continuity between vapor pressure sensor and fuel
tank
(2 trip detection logic)
After the purge cut off operates, the pressure in the charcoal
canister is maintained at atmospheric pressure
(2 trip detection logic)
WIRING DIAGRAM
Refer to Evaporative Emission Control System Malfunction on page DI−76.
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.
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.
(c) Check the vacuum hose for cracks, hole, damage, and blockage.
NG Repair or replace.

DI−84
− DIAGNOSTICSENGINE
1996 RAV4 (RM447U)
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.

S02467
Suction
No Suction
− DIAGNOSTICSENGINE
DI−85
1996 RAV4 (RM447U)
6 Check the purge flow.
PREPARATION:
(a) Connect the TOYOTA hand−held tester to the DLC3.
(b) Select the ACTIVE TEST mode on the TOYOTA hand−
held tester.
(c) Disconnect from the charcoal canister the vacuum hose
to the VSV for EVAP.
(d) Start the engine.
CHECK:
When the VSV for EVAP is operated by the TOYOTA hand−
held tester, check whether the disconnected hose applies suc-
tion to your finger.
OK:
VSV is ON:
Disconnected hose applies suction to your finger.
VSV is OFF:
Disconnected hose applies no suction to your finger.
OK Go to step 10.
NG
7 Check the vacuum hose between intake manifold and VSV for EVAP, and VSV for
EVAP and charcoal canister.
CHECK:
(a) Check that the vacuum hose is connected correctly.
(b) Check the vacuum hose for looseness and disconnection.
(c) Check the vacuum hose for cracks, hole, damage and blockage.
NG Repair or replace.
OK
8 Check operation of the VSV for EVAP (See page SF−43).
NG Replace VSV.
OK

S02468P25068A07401
VSV Connector
for Vapor Pressure Sensor
PTNK (+)E2 (−)
DI−86
− DIAGNOSTICSENGINE
1996 RAV4 (RM447U)
9 Check for open and short in harness and connector between EFI main relay
(Marking: EFI) 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).
10 Connect the TOYOTA hand−held tester, when VSV connector for vapor pressure
sensor is disconnected and VSV for EVAP is ON, measure voltage between ter-
minals PTNK and E2 of ECM connector.
PREPARATION:
(a) Connect the TOYOTA hand−held tester to the DLC3.
(b) Disconnect the VSV connector for vapor pressure sensor.
(c) Select the ACTIVE TEST mode on the TOYOTA hand−
held tester.
(d) Remove side trim cover (See page SF−61).
(e) Start the engine.
CHECK:
Measure voltage between terminals PTNK and E2 of ECM con-
nector, when VSV for EVAP is ON, using the TOYOTA hand−
held tester.
OK:
Voltage: 2.0 V or less
OK Go to step 12.
NG

− DIAGNOSTICSENGINE
DI−87
1996 RAV4 (RM447U)
11 Check the vacuum between charcoal canister and VSV for vapor pressure sen-
sor, and vapor pressure sensor and VSV for vapor pressure sensor.
CHECK:
(a) Check that the vacuum hose is connected correctly.
(b) Check the vacuum hose for looseness and disconnection.
(c) Check the vacuum hose for cracks, hole, damage and blockage.
NG Repair or replace.
OK
12 Check operation of the VSV for vapor pressure sensor (See page SF−47).
NG Replace VSV.
OK
13 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

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).