Suzuki Swift User Manual

6-64 ENGINE GENERAL INFORMATION AND DIAGNOSIS (TBI FOR G10)
Sensed
information
Exhaust
gas
Fuel
injector
A/F
mixture
Signal to decrease amount of fuel injection
Signal to increase amount of fuel injection
High voltage
Low voltage
INJECTOR
HEATED
OXYGEN
SENSOR-1
A / F mixture
becomes
richer
Oxygen
concentration
decreases
A / F mixture
becomes
leaner
Oxygen
concentration
increases
ECM
(PCM)
ECM
(PCM)
Main
fuse
Ignition switch
“IG COIL METER”
Main relay
To other circuits
Injector resistor
To other
sensor
Fuel
injector
Heated oxygen sensor-1
HO2S-1
DTC P0171 FUEL SYSTEM TOO LEAN
DTC P0172 FUEL SYSTEM TOO RICH
CIRCUIT DESCRIPTION
DTC DETECTING CONDITION POSSIBLE CAUSE
D When following condition occurs while engine running under
closed loop condition.
– Air/fuel ratio too lean
Total fuel trim (short and long terms added) is
more than 30%
or
– Air/fuel ratio too rich
(Total fuel trim is less than –30%)
: 2 driving cycle detection logic, continuous monitoring.
D Vacuum leaks (air drawn in).
D Exhaust gas leakage.
D Heated oxygen sensor-1 circuit
malfunction.
D Fuel pressure out of specification.
D Fuel injector malfunction (clogged or
leakage).
D MAP sensor poor performance.
D ECT sensor poor performance.
D IAT sensor poor performance.
D TP sensor poor performance.
D EVAP control system malfunction.
D PCV valve malfunction.

Suzuki Swift Specifications

General

Brand	Suzuki
Model	Swift
Category	Automobile
Language	English