2001 TOYOTA SEQUOIA spark plugs replace

MA004±18
P08488
Back Front
± MAINTENANCEENGINE
MA±5
52 Author: Date:
2005 SEQUOIA (RM1146U)
ENGINE
INSPECTION
HINT:
Perform the following procedures when the engine is cold.
1. REPLACE TIMING BELT
(See page EM±13)
2. INSPECT DRIVE BELT
(See page CH±1)
3. REPLACE SPARK PLUGS
(See page IG±1)
4. INSPECT AIR FILTER
(a) Visually check that the air cleaner element is not exces-
sively dirty, damaged or oily.
HINT:
Oiliness may indicate a stuck PCV valve.
If necessary, replace the air cleaner element.
(b) Clean the element with compressed air.
First blow from back side thoroughly, then blow off the
front side of the element.
5. REPLACE AIR FILTER
Replace the used air cleaner element with a new one.
6. REPLACE ENGINE OIL AND OIL FILTER
(See page LU±2)
7. REPLACE ENGINE COOLANT
(See page CO±2)
8. INSPECT CHARCOAL CANISTER
(See page EC±9)
9. REPLACE GASKET IN FUEL TANK CAP
(See page SF±33)
10. INSPECT FUEL LINES, CONNECTIONS, FUEL TANK
VAPOR VENT SYSTEM HOSES AND FUEL TANK
BAND
Visually inspect the fuel lines for cracks, leakage loose connec-
tions, deformation or tank band looseness.
11. INSPECT EXHAUST PIPES AND MOUNTINGS
Visually inspect the pipes, hangers and connections for severe
corrosion, leaks or damage.
12. INSPECT VALVE CLEARANCE
(See page EM±4)

B17396
HT +B
AF± AF+ Sensor 1A/F Sensor Component Side:
Front View
DI±174
± DIAGNOSTICSENGINE
368 Author: Date:
2005 SEQUOIA (RM1146U)
9 Check for spark and ignition (See page IG±1).
HINT:
If the spark plugs or ignition system malfunction, engine misfire may occur. The misfire counter can be read
with the hand±held tester. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / DATA LIST / MIS-
FIRE / CYL#1 (to CYL#8).
NG Repair or replace ignition system.
OK
10 Check injector injection (See page SF±29).
HINT:
If the injectors malfunction, engine misfires may occur. The misfire counter can be read with the hand±held
tester. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / DATA LIST / MISFIRE / CYL#1 (to
CYL#8).
NG Replace injector.
OK
11 Check resistance of air±fuel ratio (A/F) sensor heater.
PREPARATION:
Disconnect the air±fuel ratio (A/F) sensor connector.
CHECK:
Measure resistance between the terminals of the A/F sensor
connector.
OK:
Standard:
Tester ConnectionSpecified Condition
HT (1) ± +B (2)1.8 to 3.4 W at 20C (68F)
HT (1) ± AF± (4)10 kW or higher
NG Replace air±fuel ratio (A/F) sensor.
OK

SPARK TEST
Replace the crankshaft position sensor.
CHECK CONNECTION OF IGNITION COIL
CONNECTOR
CHECK RESISTANCE OF CRANKSHAFT POSITION
Resistance:Cold Hot
CHECK IGT SIGNAL FROM ECM
(See page DI±221)
REPAIR WIRING BETWEEN IGNITION COIL
AND ECM
Connect securely.
Check wiring between ignition switch
to ignition coil (with igniter).
Check ECM (See page IN±35)
NG
OK
OK
OKBAD
BAD
BAD
CHANGE IT TO NORMAL IGNITION COIL (WITH
IGNITER) AND PERFORM SPARK TEST AGAIN
OKReplace the ignition coil (with igniter).
NO
OK
985 ± 1,600 W1,265 ± 1,890 WBAD
CHECK POWER SUPPLY TO IGNITION COIL (WITH
1. Turn ignition switch to ON.
2. Check that there is battery voltage at ignition coil positive (+)
terminal.IGNITER)
CHECK TDC
NG
SENSOR (See page IG±12)
B03198
16 mm Plug Wrench
IG±2
± IGNITIONIGNITION SYSTEM
2863 Author: Date:
2005 SEQUOIA (RM1146U)
If the spark does not occur, do the test as follows:
(7) Using a 16 mm plug wrench, install the spark plugs.
Torque: 17.5 N´m (180 kgf´cm, 13 ft´lbf)
(8) Reinstall the ignition coils (with igniter).
(see page IG±6)
2. INSPECT SPARK PLUGS
(a) Remove the ignition coils (with igniter).
(see page IG±5)
(b) Using a 16 mm plug wrench, remove the spark plugs.

IG0152
IG0148
P03792
± IGNITIONIGNITION SYSTEM
IG±3
2864 Author: Date:
2005 SEQUOIA (RM1146U)
(c) Clean the spark plugs.
If the electrode has traces of wet carbon, allow it to dry and then
clean with a spark plug cleaner.
Air pressure: Below 588 kPa (6 kgf/cm
2, 85 psi)
Duration: 20 seconds or less
HINT:
If there are traces of oil, remove it with gasoline before using the
spark plug cleaner.
(d) Check the spark plug for thread damage and insulator
damage.
If abnormal, replace the spark plug.
Recommended spark plug:
DENSO madeSK20R11
NGK madeIFR6A11
(e) Adjust the spark plug electrode gap.
Electrode gap: 1.0 to 1.1 mm (0.039 to 0.043 in.)
(f) Using a 16 mm plug wrench, install the spark plugs.
Torque: 17.5 N´m (180 kgf´cm, 13 ft´lbf)
(g) Reinstall the ignition coils (with igniter).
(see page IG±6)