Suzuki Baleno Manual page 1409

DTC P0171 FUEL SYSTEM TOO LEAN
DTC P0172 FUEL SYSTEM TOO RICH
DTC DETECTING CONDITION AND TROUBLE AREA
DTC DETECTING CONDITION
P0171:
Total fuel trim is higher than 33%.
P0172:
Total fuel trim is lower than – 33%.
(2 driving cycle detection logic)
DTC CONFIRMATION PROCEDURE
WARNING:
When performing a road test, select a place where there is no traffic or possibility of a traffic acci-
dent and be very careful during testing to avoid occurrence of an accident.
Road test should be carried out with 2 persons, a driver and a tester, on a level road.
NOTE:
Check to make sure that the following conditions are satisfied when using this DTC CONFIRMATION PRO-
CEDURE.
Intake air temp.: –75C (17.45F) or higher
Altitude (barometric pressure): 2400m, 8000 ft or less (560 mmHg 75 kPa or more)
1) With ignition switch OFF, connect scan tool.
2) Turn ON ignition switch and clear DTC using scan tool.
3) Start engine and warm up to normal operating temperature.
4) Operate vehicle within freeze frame data condition as noted for 5 min.
5) Stop vehicle and check DTC and pending DTC.
TROUBLESHOOTING
STEP
1 Was ENGINE DIAG. FLOW TABLE performed?
2 Is there DTC(s) other than "P0171" and "P0172"?
3 Check intake system and exhaust system for leakage.
Are intake system and exhaust system in good condition?
4 Check fuel pressure referring to TABLE B-3 in this section.
Is check result satisfactory?
5 Check fuel injectors referring to "Fuel Injector Inspection"
in section 6E4.
Is check result satisfactory?
ENGINE GENERAL INFORMATION AND DIAGNOSIS (J18 ENGINE WITH WU TWC) 6-2-61
ACTION
TROUBLE AREA
Vacuum leaks
Exhaust gas leakage
Fuel pressure out of specification
Fuel injector malfunction
Heated oxygen sensor-1 malfunction
MAF sensor malfunction
ECT sensor malfunction
Fuel level sensor malfunction
YES
Go to Step 2. Go to ENGINE
DIAG. FLOW
TABLE.
Go to applicable Go to Step 3.
DTC FLOW TABLE.
Go to Step 4. Repair or replace.
Go to Step 5. Repair or replace.
Go to Step 6. Faulty injector(s) or
its circuit.
NO