EM-2
-
ENGINE MECHANICAL
CO/HC
945
Author:
Date:
2001 SIENNA (RM787U)
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:
Incorrect timing
Fouled, shorted or improperly gapped plugs
Open or crossed high-tension cords
6. Incorrect valve clearance
7. Leaky intake and exhaust valves
8. Leaky cylinders
Low
High
Rough idle
(Fluctuating HC reading)
1. Vacuum leaks:
PCV hoses
Intake manifold
Air intake chamber
Throttle body
IAC valve
Break booster line
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
Defective ECT sensor
Faulty ECM
Faulty injectors
Faulty throttle position sensor
Faulty MAF meter
Содержание RM787U
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