Suzuki GRAND VITARA Owner's Manual page 167

DTC Detecting Condition and Trouble Area
DTC detecting condition
DTC P0171:
Total fuel trim (short term fuel trim + long term fuel trim) is higher
than specified range for 30 to 90 sec (depending on ECT)
continuously.
(2 driving cycle detection logic)
DTC P0172:
Total fuel trim (short term fuel trim + long term fuel trim) is lower
than specified range for 30 to 90 sec (depending on ECT)
continuously.
(2 driving cycle detection logic)
DTC P2195:
A/F sensor output is lower than specification while vehicle is
running constant speed and constant engine load after warmed
up.
(2 driving cycle detection logic)
DTC P2196:
A/F sensor output is higher than specification while vehicle is
running constant speed and constant engine load after warmed
up.
(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
accident and be very careful during testing to avoid occurrence of an accident.
• Road test should be carried out by 2 persons, a driver and a tester, on a level road.
NOTE
Check to make sure that following conditions are satisfied when using this "DTC Confirmation
Procedure".
• Intake air temperature at engine start: –10 °C (14 °F) to 80 °C (176 °F)
• Intake air temperature: –10 °C (14 °F) to 70 °C (158 °F)
• Engine coolant temperature: 70 °C (158 °F) to 150 °C (302 °F)
• Altitude (barometric pressure): 2400 m, 8000 ft or less (560 mmHg, 75 kPa or more)
1) With ignition switch turned OFF, connect scan tool.
2) Turn ON ignition switch and print Freeze Frame Data or write them down using scan tool.
3) Clear DTC using scan tool.
4) Start engine and warm up to normal operating temperature.
5) Operate vehicle with condition as noted freeze frame data for 5 min.
6) Stop vehicle and check DTC and pending DTC.
Engine General Information and Diagnosis:
Trouble area
• Vacuum leakage
• Exhaust gas leakage
• Fuel pressure out of specification
• Fuel injector malfunction
• A/F sensor malfunction
• MAF sensor malfunction
• ECT sensor malfunction
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