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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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