Toyota Camry Manual page 2115

EM–2
CO HC
Normal High
Low Low High High
High High
ENGINE MECHANICAL (1MZ–FE)
If the CO/HC concentration dose not comply with regulations,
troubleshoot in the order given below.
See the table below for possible causes, then inspect and cor-
rect the applicable causes if necessary.
Problems
Rough idle
Rough idle Rough idle
(Filtrating HC reading) (Filtrating HC reading)
Rough idle
(Black smoke from exhaust)
– CO/HC
1. Faulty ignitions:
Incorrect timing 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 3 Leaky EGR valve
4.Leaky intake and exhaust valves
5.Leaky cylinder
1. Vacuum leaks: 1. Vacuum leaks:
PCV hose PCV hose
EGR valve EGR valve
Intake manifold Intake manifold
Air intake chamber Air intake chamber
Throttle body Throttle body
IAC valve IAC valve
Brake booster line Brake booster line
2. Lean mixture causing misfire
1. Restricted air filter
2. Faulty SFI system
Faulty pressure regulator
Defective ECT sensor
Faulty ECM
Faulty injectors
Faulty throttle position sensor
Faulty MAF meter
Author :
Causes
Date :
1288