Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Toyota Sienna 1998-2003 Approved FSM 06 cohc insp
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EM-1
ENGINE MECHANICAL - CO/HC
CO/HC EM0AY-05
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 check 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 SE-
CONDS
4. INSERT CO/HC METER TESTING PROBE AT LEAST
40 cm (1.3 ft) INTO TAILPIPE DURING IDLING
CO/HC Meter
5. IMMEDIATELY CHECK CO/HC CONCENTRATION AT
IDLE AND/OR 2,500 RPM
HINT:
When doing the 2 mode (idle and 2,500 rpm) test, these mea-
surement order prescribed by the applicable local regulations.
A01683
2001 SIENNA (RM787U)
Author : Date : 944
EM-2
ENGINE MECHANICAL - CO/HC
6. TROUBLESHOOTING
If the CO/HC concentration does not comply with regulations,
troubleshoot in the order given below.
See the table below for possible causes, and then inspect and
correct the applicable causes if necessary.
CO HC Problems Causes
Normal High Rough idle 5. Faulty ignitions:
S Incorrect timing
S Fouled, shorted or improperly gapped plugs
S Open or crossed high-tension cords
6. Incorrect valve clearance
7. Leaky intake and exhaust valves
8. Leaky cylinders
Low High Rough idle 1. Vacuum leaks:
(Fluctuating HC reading) S PCV hoses
S Intake manifold
S Air intake chamber
S Throttle body
S IAC valve
S Break booster line
2. Lean mixture causing misfire
High High Rough idle 1. Restricted air filter
(Black smoke from exhaust) 2. Plugged PCV valve
3. Faulty SFI systems:
S Faulty pressure regulator
S Defective ECT sensor
S Faulty ECM
S Faulty injectors
S Faulty throttle position sensor
S Faulty MAF meter
2001 SIENNA (RM787U)
Author : Date : 945
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