Toyota Camry Manual page 2001

EM–2
CO HC
Normal High
Low High
High High
ENGINE MECHANICAL (5S–FE)
If the CO/HC concentration does not comply with regulations,
troubleshoot in the order given below.
Symptom
Rough idle
Rough idle
(Fluctuating HC reading)
Rough idle
(Black smoke from exhaust)
– CO/HC
(1) Check oxygen sensor operation.
(See page DI–66)
(2) See the table below for possible causes, then in-
spect and correct the applicable causes if neces-
sary.
1. Faulty ignitions:
Incorrect timing
Fouled, shorted or improperly gapped plugs
O en or crossed high–tension cords Open or crossed high–tension cords
2. Incorrect valve clearance
3. Leaky EGR valve
4. Leaky intake and exhaust valves
5. Leaky cylinder
1. Vacuum leaks:
PCV hose
EGR valve
Intake manifold
Throttle body
IAC valve
Brake booster line
2. Lean mixture causing misfire
1. Restricted air filter
2. Faulty SFI system
Faulty pressure regulator
Defective ECT sensor
Defective IAT sensor
Faulty ECM
Faulty injector
Faulty throttle position sensor
MAP sensor
Author :
Causes
Date :
1174