1996 TOYOTA RAV4 fuel

− 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.

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.

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

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

A15827
− DIAGNOSTICSENGINE
DI−105
1996 RAV4 (RM447U)
DTC P1500 Starter Signal Circuit Malfunction
CIRCUIT DESCRIPTION
When the engine is cranked, the intake air flow is slow, so fuel vaporization is poor. A rich mixture is therefore
necessary in order to achieve good startability. While the engine is being cranked, the battery positive volt-
age is applied to terminal STA of the ECM. The starter signal is mainly used to increase the fuel injection
volume for the starting injection control and after−start injection control.
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:
This diagnostic chart is based on the premise that the engine is cranked normally. If the engine is not
cranked, proceed to the matrix chart of problem symptoms on page DI−20.
DI965−01

S02405
Battery22
2W1
17
16R/B No.2
R−W
IB220
R−W
E6BATTECM
MAIN FLEFI DI−108
− DIAGNOSTICSENGINE
1996 RAV4 (RM447U)
DTC P1600 ECM BATT Malfunction
CIRCUIT DESCRIPTION
Battery positive voltage is supplied to terminal BATT of the ECM even the ignition switch is OFF for use by
the DTC memory and air−fuel ratio adaptive control value memory, etc.
DTC No.DTC Detecting ConditionTrouble Area
P1600Open in back up power source circuitOpen in back up power source circuit
ECM
HINT:
If DTC P1600 appear, the ECM does not store another DTC.
WIRING DIAGRAM
DI403−01

DI−11 0
− DIAGNOSTICSENGINE
1996 RAV4 (RM447U)
DTC P1780 Park/Neutral Position Switch Malfunction
CIRCUIT DESCRIPTION
The park / neutral position switch goes on when the shift lever is in the N or P shift position. When it goes
on terminal NSW of the ECM is grounded to body ground via the starter relay thus the terminal NSW voltage
becomes 0 V. When the shift lever is in the D, 2, L or R position, the park / neutral position switch goes off,
so the voltage of ECM terminal NSW becomes battery positive voltage, the voltage of the ECM internal pow-
er source.
If the shift lever is moved from the N position to the D position, this signal is used for air−fuel ratio correction
and for idle speed control (estimated control), etc.
DTC No.DTC Detecting ConditionTrouble Area
P1780
Two or more switches are ON simultaneously for ”N”, ”2”, ”L”
and ”R” position
(2 trip detection logic)
Short in park / neutral position switch circuit
Park / neutral position switch
ECMWhen driving under conditions (a) and (b) for 30 sec. or more
the park / neutral position switch is ON (N position):
(2 trip detection logic)
(a) Vehicle speed: 80 km/h (50 mph) or more
(b) Engine speed: 1,500 ∼ 3,000 rpm
HINT:
After confirming DTC P1780 use the TOYOTA hand−held tester to confirm the PNP switch signal from ”CUR-
RENT DATA”.
DI404−01

S02410
EFI
MAIN No.1
IG Switch AM2
MAIN
FL
BatteryPark/Neutral
Position Switch
(Clutch Start
Switch)EFI Main
RelayCircuit Opening
Relay
Fuel Pump
ECM
FC
Tr
STA
NE (STA Signal)
(NE Signal) Starter IGN
ST Relay DI−11 6
− DIAGNOSTICSENGINE
1996 RAV4 (RM447U)
Fuel Pump Control Circuit
CIRCUIT DESCRIPTION
In the diagram below, when the engine is cranked, current flows from terminal ST of the ignition switch to
the starter relay coil and also current flows to terminal STA of ECM (STA signal).
When the STA signal and NE signal are input to the ECM, Tr is turned ON, current flows to coil of the circuit
opening relay, the relay switches on, power is supplied to the fuel pump and the fuel pump operates.
While the NE signal is generated (engine running), the ECM keeps Tr ON (circuit opening relay ON) and the
fuel pump also keeps operating.
DI407−02