Lexus GS300/400 (2000 year). Manual — part 129
EM0D0–01
A00982
CO/HC Meter
–
ENGINE MECHANICAL (2JZ–GE)
CO/HC
EM–1
1355
CO/HC
INSPECTION
HINT:
This check is used only to determine whether or not the idle
CO/HC complies with regulations.
1.
INITIAL CONDITIONS
(a)
Engine at normal operating temperature
(b)
Air cleaner installed
(c)
All pipes and hoses of air induction system connected
(d)
All accessories switched OFF
(e)
All vacuum lines properly connected
(f)
SFI system wiring connectors fully plugged
(g)
Ignition timing checked correctly
(h)
Transmission in neutral position
(i)
Tachometer and CO/HC meter calibrated by hand
2.
START ENGINE
3.
RACE ENGINE AT 2,500 RPM FOR APPROX. 180
SECONDS
4.
INSERT CO/HC METER TESTING PROBE AT LEAST
40 cm (1.3 ft) INTO TAILPIPE DURING IDLING
5.
IMMEDIATELY CHECK CO/HC CONCENTRATION AT
IDLE AND/OR 2,500 RPM
HINT:
When doing the 2 mode (2,500 rpm and idle) test, follow the
measurement order prescribed by the applicable local regula-
tions.
EM–2
–
ENGINE MECHANICAL (2JZ–GE)
CO/HC
1356
If the CO/HC concentration does not comply with regulations,
troubleshoot in the order given below.
(a)
Check heated oxygen sensors operation.
(See page
(b)
See the table below for possible causes, and then inspect
and correct the applicable causes if necessary.
HC
CO
Phenomenon
Causes
High
Normal
Rough idle
1. Faulty ignitions:
Incorrect timing
Fouled, shorted or improperly gapped plugs
Open or crossed high–tension cords
2. Incorrect valve clearance
3. Leaky intake and exhaust valves
4. Leaky cylinder
High
Low
Rough idle
(Fluctuating HC reading)
1. Vacuum leaks:
PCV hose
Intake manifold
Throttle body
Cylinder head gasket
2. Lean mixture causing misfire
High
High
Rough idle
(Black smoke from exhaust)
1. Restricted air filter
2. Plugged PCV valve
3. Faulty SFI systems:
Faulty pressure regulator
Faulty ECM
Faulty injector
Faulty throttle position sensor
Faulty mass air flow meter
B01982
LEXUS
Hand–Held
Tester
EM0D3–02
A02667
TC
E1
SST
DLC1
A02668
Igniter
White Lead Wire
A02637
EM–12
–
ENGINE MECHANICAL (2JZ–GE)
IGNITION TIMING
1366
IGNITION TIMING
INSPECTION
1.
WARM UP ENGINE
Allow the engine to warm up to normal operating temperature.
2.
CONNECT LEXUS HAND–HELD TESTER OR OBDII
SCAN TOOL
(a)
Connect the LEXUS hand–held tester or OBDII scan tool
to the DLC3.
(b)
Please refer to the LEXUS hand–held tester or OBDII
scan tool operator’s manual for further details.
3.
CONNECT TIMING LIGHT TO ENGINE
4.
)
5.
INSPECT IGNITION TIMING
(a)
Using SST, connect terminals TC and E1 of the DLC1.
SST
09843–18020
(b)
Connect the timing light clip to the white lead wire.
NOTICE:
Use a timing light that can detect the primary signal.
(c)
Using a timing light, check the ignition timing.
Ignition timing: 10
± 2°
BTDC @ idle
(Transmission in neutral position)
(d)
Remove the SST from the DLC1.
6.
FURTHER CHECK IGNITION TIMING
Ignition timing: 6 – 16
°
BTDC @ idle
(Transmission in neutral position)
HINT:
The timing mark moves in a range between 6
°
and 16
°
.
7.
DISCONNECT TIMING LIGHT FROM ENGINE
8.
DISCONNECT LEXUS HAND–HELD TESTER OR
OBDII SCAN TOOL
EM0D4–01
–
ENGINE MECHANICAL (2JZ–GE)
IDLE SPEED
EM–13
1367
IDLE SPEED
INSPECTION
1.
INITIAL CONDITIONS
(a)
Engine at normal operating temperature
(b)
Air cleaner installed
(c)
All pipes and hoses of air induction system connected
(d)
All accessories switched OFF
(e)
All vacuum lines properly connected
(f)
SFI system wiring connectors fully plugged
(g)
Ignition timing checked correctly
(h)
Transmission in neutral position
2.
CONNECT LEXUS HAND–HELD TESTER OR OBDII SCAN TOOL (See page
3.
INSPECT IDLE SPEED
(a)
Race the engine speed at 2,500 rpm for approx. 90 seconds.
(b)
Check the idle speed.
Idle speed: 700
±
50 rpm
If the idle speed is not as specified, check the throttle body.
4.
DISCONNECT LEXUS HAND–HELD TESTER OR OBDII SCAN TOOL
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст