Toyota Celica 2005 Repair Manual page 1388

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2005 CELICA (RM1131U)

ENGINE MECHANICAL

If the CO/HC concentration does not comply with regulations,

troubleshoot in the order given below.

(Fluctuating HC reading)

(Black smoke from exhaust)

Check heated oxygen sensor operation (See page

DI−112 or DI−411).

See the table below for possible causes, and then

inspect and correct the applicable causes if neces-

4. Faulty ignitions:

S Incorrect timing

S Fouled, shorted or improperly gapped plugs

S Open or crossed high−tension cords

5. Incorrect valve clearance

6. Leaky intake and exhaust valves

7. Leaky cylinders

1. Vacuum leaks:

S Intake manifold

S Throttle body

S Brake booster line

2. Lean mixture causing misfire

1. Restricted air filter

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

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