Toyota Tundra (2015 year). Manual — part 1720
650 to 750 rpm (transmission in neutral and A/C switch OFF)
If the idle speed is not as specified, check the air intake
system.
(4) Disconnect the tachometer probe from the DLC3.
3. INSPECT COMPRESSION
(a) Warm up and stop the engine.
(1) Allow the engine to warm up to a normal operating temperature.
(b) Remove the V-bank cover.
(c) Remove the air cleaner hose assembly.
(d) Remove the air cleaner cap.
(e) Disconnect the 2 injector connectors and 8 ignition coil
connectors.
(f) Remove the 8 bolts and 8 ignition coils.
(g) Remove the 8 spark plugs.
(h) Check the cylinder compression pressure.
NOTICE:
Check each cylinder's compression pressure in the same way.
(1) Insert a compression gauge into the spark plug hole.
(2) Fully open the throttle.
(3) While cranking the engine, measure the compression
pressure.
Standard compression pressure:
1300 kPa (13.3 kgf/cm
2
, 189 psi)
Minimum pressure:
1000 kPa (10.2 kgf/cm
2
, 145 psi) or more
Difference between each cylinder:
100 kPa (1.0 kgf/cm
2
, 15 psi) or less
NOTICE:
3UR-FBE ENGINE MECHANICAL: ENGINE: ON-VEHICLE INSPE...
Then inspect the cylinder compression pressure again.
HINT:
If adding oil helps boost the compression, it is likely that the
piston rings and/or cylinder bore are worn or damaged.
If pressure stays low, a valve may be stuck or seated
improperly, or there may be leakage in the gasket.
(i) Install the 8 spark plugs.
(j) Install the 8 ignition coils with the 8 bolts.
(k) Connect the 2 injector connectors and 8 ignition coil connectors.
(l) Install the air cleaner cap.
(m) Install the air cleaner hose.
(n) Install the V-bank cover.
4. INSPECT CO/HC
HINT:
This check is used only to determine whether or not the idle CO/ HC complies with regulations.
(a) Start the engine.
(b) Keep the engine speed at 2500 rpm for approximately 180 seconds.
(c) Insert the CO/HC meter testing probe at least 40 cm (1.31
ft.) into the tailpipe during idling.
(d) Immediately check CO/HC concentration at idle and/or 2500 rpm.
HINT:
When performing the 2 mode (2500 rpm and idle) test, follow the measurement order prescribed by the
applicable local regulations.
(e) If the CO/HC concentration does not comply with the regulations, troubleshoot in the order given
below.
(1) Check the A/F sensor operation
and heated oxygen sensor operation
.
(2) See the table below for possible causes, and then inspect and correct the applicable causes if
necessary.
CO
HC
SYMPTOM
CAUSE
Normal High Rough idle
Faulty ignitions:
Incorrect timing
1.
3UR-FBE ENGINE MECHANICAL: ENGINE: ON-VEHICLE INSPE...
CO
HC
SYMPTOM
CAUSE
Plugs (contaminated, shorted or gaps are
defective)
Incorrect valve clearance
2.
Leaky intake and exhaust valves
3.
Leaky cylinder
4.
Low
High
Rough idle
(Fluctuating HC reading)
Vacuum leaks:
PCV hose
Intake manifold
Throttle body
Brake booster line
1.
Lean mixture causing misfire
2.
High
High
Rough idle
(Black smoke from
exhaust)
Restricted air filter
1.
Faulty SFI system:
Faulty pressure regulator
Defective ECT sensor
Faulty ECM
Faulty injectors
Faulty throttle position sensor
Faulty MAF meter
2.
3UR-FBE ENGINE MECHANICAL: ENGINE: ON-VEHICLE INSPE...
Last Modified: 9-16-2014
6.6 K
Doc ID: RM0000031RR01OX
Model Year: 2015
Model: Tundra
Prod Date Range: [08/2014 - ]
Title: 3UR-FBE ENGINE MECHANICAL: ENGINE ASSEMBLY: COMPONENTS; 2015 MY Tundra [08/2014 - ]
COMPONENTS
ILLUSTRATION
ILLUSTRATION
3UR-FBE ENGINE MECHANICAL: ENGINE ASSEMBLY: COMP...
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст