Suzuki Engine 2002 GRAND VITARA SQ420 Service Manual page 165

6-1-24 ENGINE GENERAL INFORMATION AND DIAGNOSIS (H25 ENGINE)
DTC NO.
P0154 (vehicle
without diagno-
sis connector)/
HO2S (Bank 2 – Sensor 1)
P0150 (vehicle
no activity detected
with diagnosis
connector)
(No.26)
HO2S heater circuit
P0155 malfunction (Bank 2 –
Sensor 1)
HO2S circuit malfunction
P0156
(Bank 2 – Sensor 2)
HO2S heater circuit
P0161 malfunction (Bank 2 –
Sensor 2)
Fuel system too lean
P0171
(Bank 1)
Fuel system too rich
P0172
(Bank 1)
Fuel system too lean
P0174
(Bank 2)
Fuel system too rich
P0175
(Bank 2)
Random misfire detected
P0300
Cylinder 1 misfire detected
P0301
P0302 Cylinder 2 misfire detected
P0303 Cylinder 3 misfire detected
P0304 Cylinder 4 misfire detected
P0305 Cylinder 5 misfire detected
P0306 Cylinder 6 misfire detected
Knock sensor circuit mal-
P0325 (No.43)
function
DETECTING ITEM
DETECTING CONDITION
(DTC will set when detecting : )
Output voltage of HO2S-1 fails to
go above specification (or HO2S-1
circuit open).
Terminal voltage is lower than
specification at heater OFF or it is
higher at heater ON.
Max. voltage of HO2S-2 is lower
than specification or its min. volt-
age is higher than specification.
Terminal voltage is lower than
specification at heater OFF or it is
higher at heater ON (or heater cir-
cuit or short).
Short term fuel trim or total fuel trim
(short and long terms added) is
larger than specification for speci-
fied time or longer. (Fuel trim
toward rich side is large.)
Short term fuel trim or total fuel trim
(short and long term added) is
smaller than specification for speci-
fied time or longer. (Fuel trim
toward lean side is large.)
Short term fuel trim or total fuel trim
(short and long terms added) is
larger than specification for speci-
fied time or longer. (Fuel trim
toward rich side is large.)
Short term fuel trim or total fuel trim
(short and long term added) is
smaller than specification for speci-
fied time or longer. (Fuel trim
toward lean side is large.)
Misfire of such level as to cause
damage to three way catalyst
Misfire of such level as to deterio-
rate emission but not to cause
damage to three way catalyst
Knock sensor circuit low input
Knock sensor circuit high input
MIL MIL
vehicle (vehicle
without with
monitor monitor
connector connector)
2 driving 2 driving
cycles cycles
2 driving Not
cycles applicable
2 driving Not
cycles applicable
2 driving Not
cycles applicable
2 driving Not
cycles applicable
2 driving Not
cycles applicable
2 driving Not
cycles applicable
2 driving Not
cycles applicable
MIL flash-
ing during Not
misfire applicable
detection
2 driving Not
cycles applicable
1 driving 1 driving
cycle cycle