Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Toyota Echo 2000-2002 Approved techinfo.toyota.com ileaf 02toyrm 02toypdf 02rmsour 2002 02echorm em cohc insp
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EM-1
ENGINE MECHANICAL - CO/HC
CO/HC EM167-01
INSPECTION
HINT:
This check is used only to determine whether or not the idle
CO/HC complies with regulations.
1. INSTALL CONDITIONS
(a) Engine at normal operating temperature
(b) Air cleaner installed
(c) Air 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
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
Complete the measuring with 3 minutes.
HINT:
When doing the 2 mode (idle and 2,500 rpm) test, these mea-
surement order prescribed by the applicable local regulations.
A11216
2002 ECHO (RM884U)
Author : Date : 615
EM-2
ENGINE MECHANICAL - CO/HC
If the CO/HC concentration does not comply with regulations,
troubleshoot in the order given below.
S Check heated oxygen sensor operation.
(See page DI-48 )
S 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 1. Faulty ignitions:
S Incorrect timing
S Fouled, shorted or improperly gapped plugs
S Open or crossed high-tension cords
2. Incorrect valve clearance
3. Leaky intake and exhaust valves
4. Leaky cylinders
Low High Rough idle 1. Vacuum leaks:
(Fluctuating HC reading) S PCV hoses
S Intake manifold
S Throttle body
S IAC valve
S Brake 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 Defective IAT sensor
S Faulty ECM
S Faulty injectors
S Faulty throttle position sensor
2002 ECHO (RM884U)
Author : Date : 616
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