check engine light TOYOTA RAV4 1996 Service Owner's Manual

Fig. 1: Testing Bulb Check Relay (Tacoma & 4Runner)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
DOOR COURTESY SWITCH
Land Cruiser, RAV4, Sienna & 4Runner
Turn ignition switch to OFF position. Locate door courtesy switch in door jamb. Check for continuity between
door courtesy switch terminal and switch body. With switch pin released (switch ON), continuity should exist.
With switch pin pushed in (switch OFF), no continuity should exist. If continuity is not as specified, replace
door courtesy switch.
ENGINE COOLANT TEMPERATURE GAUGE & SENDER
Wiring Harness Operational Test
1. Disconnect coolant temperature sender connector. See ENGINE COOLANT TEMPERATURE
SENDER LOCATION table. Turn ignition switch to ON position. Temperature gauge should indicate
COOL. Turn ignition switch to OFF position. Connect a 12-volt, 3.4-watt test light between coolant
temperature sender harness connector terminal and
ground.

1999 Toyota RAV4
1999-2000 ACCESSORIES & EQUIPMENT Instrument Panels - Trucks
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2. Turn ignition switch to ON position. Test light should be on and temperature gauge should slowly move
to HOT. If gauge functions as specified, replace sending unit. If gauge does not function as specified,
perform TEMPERATURE GAUGE RESISTANCE TEST
.
Engine Coolant Temperature (ECT) Sender
1. Turn ignition switch to OFF position. Disconnect ECT sender 1-pin connector. See ENGINE
COOLANT TEMPERATURE SENDER LOCATION table. Drain cooling system and remove ECT
sender. Place probe end of ECT sender and thermometer in a container of water. Connect an ohmmeter
between ECT sender terminal and ECT sender body.
2. Heat water and note resistance reading. See ENGINE COOLANT TEMPERATURE SENDER
RESISTANCE table. If resistance is not as specified, replace ECT sender.
ENGINE COOLANT TEMPERATURE SENDER LOCATION
ENGINE COOLANT TEMPERATURE SENDER RESISTANCE
Temperature Gauge Resistance Test
Turn ignition switch to OFF position. Remove instrument cluster. Using ohmmeter, check gauge resistance
between appropriate terminals on back of instrument cluster. See TEMPERATURE GAUGE RESISTANCE
SPECIFICATIONS table. See Fig. 2 -Fig. 8 . If resistance is not as specified, replace temperature gauge. If
resistance is as specified, repair open or short circuit in wiring harness.
TEMPERATURE GAUGE RESISTANCE SPECIFICATIONS
ApplicationLocation
Land CruiserTop Front Of Engine
SiennaTop Of Engine
RAV4Rear Of Cylinder Head, Exhaust Side
Tacoma & 4Runner
4-Cyl.Right Side Of Engine, Under Intake
Manifold
V6Left Cylinder Head
Tundra
V6In Rear Of Intake Manifold
V8In Front Water By-Pass Joint, Next To
ECT Sensor
Application & Water Temp. °F (°C)Ohms
Land Cruiser, Sienna, RAV4 & Tundra
122 (50)160-240
248 (120)17-21
Tacoma & 4Runner
122 (50)234-314
248 (120)24-31

1999 Toyota RAV4
1999-2000 ACCESSORIES & EQUIPMENT Instrument Panels - Trucks
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Fig. 15: Testing Rheostat Light Control (RAV4, Tacoma, Tundra & 4Runner)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
LOW OIL PRESSURE SWITCH
RAV4, Sienna, Tacoma, Tundra Without Tachometer & 4Runner
Disconnect low oil pressure switch connector. See OIL PRESSURE SWITCH LOCATION table. Using an
ohmmeter, check for continuity between oil switch and ground. Continuity should exist with engine off.
Continuity should not exist with engine running. If continuity is not as specified, replace low oil pressure
switch.
OIL PRESSURE SWITCH LOCATION
NOTE: Tundra models without a tachometer are equipped with an oil pressure switch.
Tundra models with a tachometer are equipped with an oil pressure sender. For
oil pressure sender testing, see OIL PRESSURE GAUGE & SENDER
.
ApplicationLocation
RAV4Rear Of Cylinder Head, Exhaust Side
SiennaLower Left Front Of Cylinder Block
Tacoma & 4Runner
4-CylinderRight Side Of Cylinder Block
V6Left Front Of Cylinder Block
TundraBeside Oil Filter

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1999-2000 ACCESSORIES & EQUIPMENT Instrument Panels - Trucks
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LOW OIL PRESSURE WARNING LIGHT
RAV4, Sienna, Tacoma, Tundra Without Tachometer & 4Runner
Disconnect low oil pressure switch connector. See OIL PRESSURE SWITCH LOCATION table. Using a
jumper wire, connect low oil pressure switch connector terminal to ground. Turn ignition switch to ON position.
Low oil pressure warning light should turn on. If low oil pressure warning light is off, check bulb or inspect
wiring harness.
OCCUPANT DETECTION SENSOR
Land Cruiser & Tundra
Disconnect occupant detection sensor connector, located under passenger seat. Check continuity between sensor
connector terminals. Continuity should exist only when pressing on sensor. If continuity is not as specified,
replace occupant detection sensor.
OIL PRESSURE GAUGE & SENDER
Oil Pressure Gauge & Harness Operational Test (Land Cruiser & Tundra With Tachometer)
1. Disconnect oil pressure sender connector. See OIL PRESSURE SENDER LOCATION table. Turn
ignition switch to ON position. Oil gauge should indicate LOW. Turn ignition switch to OFF position.
Connect a 12-volt, 3.4-watt test light between oil sending unit harness connector terminal and ground.
2. Turn ignition switch to ON position. Test light should be on and oil pressure gauge should slowly move
to HIGH. If gauge functions as specified, perform OIL PRESSURE SENDER OPERATIONAL
TEST . If gauge does not function as specified, perform OIL PRESSURE GAUGE RESISTANCE
TEST .
Oil Pressure Sender Operational Test (Land Cruiser & Tundra With Tachometer)
Disconnect oil pressure sender connector. See OIL PRESSURE SENDER LOCATION table. Using 12-volt
source, connect an LED tester between positive battery terminal and oil pressure sender terminal. With engine
off, LED should be off. With engine running, LED should flash. LED flashes will vary with engine speed and
oil pressure. Replace oil pressure sender if LED does not operate as specified.
OIL PRESSURE SENDER LOCATION
Oil Pressure Gauge Resistance Test (Land Cruiser & Tundra With Tachometer)
Remove instrument cluster. See INSTRUMENT CLUSTER under REMOVAL & INSTALLATION. Using
an ohmmeter, check resistance between oil gauge terminals on rear of instrument cluster. See Fig. 16
or Fig.
17 . See OIL PRESSURE GAUGE RESISTANCE SPECIFICATIONS table. If resistance is not as
specified, replace oil pressure
gauge.
ApplicationLocation
Land Cruiser & TundraOn Oil Filter Housing

1999 Toyota RAV4
1999-2000 ACCESSORIES & EQUIPMENT Instrument Panels - Trucks
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Fig. 21 . Resistance should be 347 ohms. If resistance is not as specified, replace tachometer.
Fig. 21: Identifying Voltmeter Terminals (Land Cruiser)

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
VEHICLE SPEED SENSOR
For vehicle speed sensor testing procedures, see SYSTEM & COMPONENT TESTING article in ENGINE
PERFORMANCE.
WASHER LEVEL WARNING LIGHT
Sienna, RAV4, Tacoma, Tundra & 4Runner
Disconnect washer level switch connector. Connect a jumper wire between washer level switch wiring harness
connector terminals. Turn ignition switch to ON position. Washer level warning light should be on. If washer
level warning light is off, check bulb and wiring harness. Repair as necessary.
WASHER LEVEL WARNING SWITCH
Sienna, RAV4, Tacoma, Tundra & 4Runner

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Tacoma & 4Runner
1. Start engine and warm engine to normal operating temperature. Shut engine off. Connect timing light to
spark plug wire on cylinder No. 1. Cylinder No. 1 is front cylinder at timing chain end of engine.
2. Connect scan tool to data link connector No. 3. See Fig. 24
and Fig. 25 . Scan tool is used to read engine
RPM.
3. Install Jumper Wire (SST 09843-18020) between terminals TE1 and E1 on data link connector No. 1. See
Fig. 31
. Data link connector No. 1 is located on end of intake manifold at front of engine.
4. Apply parking brake. Place transmission in Neutral. Start engine. Maintain engine at 1000 RPM for 5
seconds and then ensure engine returns to idle.
5. Timing marks are located on timing chain cover, near crankshaft pulley. Ensure base timing is within
specification at idle with transmission in Neutral, and with A/C and all accessories off. See IGNITION
TIMING SPECIFICATIONS table.
6. Remove jumper wire from data link connector No. 1. Ensure ECM controlled timing is within
specification. See IGNITION TIMING SPECIFICATIONS
table. Shut engine off. Remove timing
light and scan tool.
IGNITION TIMING SPECIFICATIONS (Degrees BTDC @ Idle)
(1)
Application(2) Base Timing(3) ECM Controlled Timing
Camry, Camry Solara & Celica8-120-10
Corolla8-126-15
RAV48-120-10
Tacoma & 4Runner3-74-17
(1)Check with engine at normal operating temperature, transmission/transaxle in Neutral, parking brake
applied, and A/C and all accessories off.
(2)With Jumper Wire (SST 09843-18020) installed between terminals TE1 and E1 on data link
connector No. 1.
(3)With jumper wire removed from data link connector No. 1.

1999 Toyota RAV4
1999 ENGINE PERFORMANCE On-Vehicle Adjustments - 4-Cylinder
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1999-2000 STARTING & CHARGING SYSTEMS
Starters
DESCRIPTION & OPERATION
All models use Nippondenso 4-brush, solenoid-actuated, reduction gear type starters, equipped with over-
running clutches. The brush holder assembly retains 4 brushes and springs in the starter housing.
Reduction gear type starters contain an integral solenoid attached to drive housing, a reduction idler gear and
bearing installed into starter housing, and a clutch drive assembly. The clutch drive assembly is mounted to
starter housing and is driven by the reduction idler gear from armature shaft. The brush holder assembly retains
4 brushes and 4 springs in the end cover of field frame housing.
All models use a starter relay to energize starter. Manual transmission vehicles use a clutch start switch and
automatic transmission vehicles use a park/neutral switch to energize starter relay. On models with theft
deterrent system, theft deterrent system ECU provides ground for starter relay.
Tacoma, Tundra and 4Runner models with 4WD and M/T use an optional clutch start cancel switch. When this
switch is turned on, it will allow engine to be started without depressing clutch pedal when transmission is in
Neutral. This allows vehicle to be driven out of difficult situations by cranking the engine with the clutch
engaged.
TROUBLE SHOOTING
1. If a no-start condition exists and battery is known to be good, connect test light or voltmeter between
starter solenoid terminal No. 50 and ground. See Fig. 8
or Fig. 9 .
2. Turn ignition switch to START position. If test light or voltmeter does not indicate voltage, check main
fusible links and large ampere main fuses in engine compartment relay box. If fusible links and fuses are
okay, see IGNITION SWITCH CONTINUITY TEST
and/or STARTER RELAY TEST under ON-
VEHICLE TESTING.
ON-VEHICLE TESTING
CLUTCH START SWITCH TEST
Switch is located above clutch pedal on bracket. Disconnect wirin
g harness connector from switch. Connect NOTE: This article also applies to Lexus LX470. For Lexus LX470, refer to Land
Cruiser, unless otherwise indicated.
NOTE: See TROUBLE SHOOTING article in GENERAL INFORMATION.
NOTE: Before testing, ensure battery is fully charged, battery cables and terminal ends
are tight and clean, and engine grounds are secure.

1999 Toyota RAV4
1999-2000 STARTING & CHARGING SYSTEMS Starters

1999 Toyota RAV4
1999-2000 STARTING & CHARGING SYSTEMS Starters
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Fig. 3: Headlight Dimmer Relay Terminals (Except Land Cruiser & Tundra Without DRL)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
TAILLIGHT CONTROL RELAY
Remove taillight control relay. See TAILLIGHT CONTROL RELAY LOCATION
table. Continuity should
exist between relay terminals No. 1 and 2 at all times. See Fig. 4
or Fig. 5 . Apply battery voltage across
specified terminals of relay connector. See TAILLIGHT CONTROL RELAY TEST
table. Check for
continuity between other specified terminals. If there is no continuity, replace relay.
TAILLIGHT CONTROL RELAY LOCATION
TAILLIGHT CONTROL RELAY TEST
NOTE: Tundra uses an integration relay instead of taillight relay. Integration relay
testing information is not available. 4Runner does not use a taillight relay.
ApplicationLocation
Land Cruiser & RAV4Behind Left Kick Panel, In Junction Block No. 1
SiennaUnder Left Side Of Dash, In Junction Block No. 1
TacomaLeft Side Of Engine Compartment, In Relay Block No. 2
Application
(1) Apply Voltage To Terminals
No.(1)Continuity Between Terminals
No.

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