Suzuki 2006 SX4 Service Manual page 126

1A-82 Engine General Information and Diagnosis:
DTC Troubleshooting
Step
1 Was "Engine and Emission Control System Check"
performed?
2 Is there DTC(s) other than fuel system (DTC P0171 / P0172
/ 2195 / 2196)?
3 Intake system and exhaust system for leakage check
1) Check intake system and exhaust system for leakage.
Are intake system and exhaust system in good condition?
4 Fuel pressure check
1) Check fuel pressure referring to "Fuel Pressure Check".
Is check result satisfactory?
5 Fuel injectors and its circuit check
1) Check fuel injectors referring to "Fuel Injector Inspection
in Section 1G".
Is check result satisfactory?
6 MAF sensor visual inspection
1) Check MAF sensor and air intake system.
• Objects which block measuring duct and resistor of
MAF sensor.
• Other air flow which does not pass MAF sensor.
Are they in good condition?
7 MAF sensor for performance check
1) With ignition switch turned OFF, connect scan tool to
DLC.
2) Start engine and warm up to normal operating
temperature.
3) Check MAF value using scan tool (Refer to "Scan Tool
Data" for normal value.).
Is each value within specified range?
8 ECT sensor for performance check
1) Check ECT sensor performance referring to Step 2 to 3
and 5 of "DTC P0116: Engine Coolant Temperature
Circuit Range / Performance".
Is check result satisfactory?
9 A/F sensor for performance check
1) Check A/F sensor referring to Step 3 and 4 of "DTC
P0131 / P0132: O2 Sensor Circuit Low Voltage / High
Voltage (Sensor-1, Bank-1)".
Is check result satisfactory?
Action Yes
Go to Step 2.
Go to applicable DTC
diag. flow.
Go to Step 4.
Go to Step 5.
Go to Step 6.
Go to Step 7.
Go to Step 8.
Go to Step 9.
Replace A/F sensor and
recheck. If this DTC is
detected again,
substitute a known-
good ECM.
No
Go to "Engine and
Emission Control
System Check".
Go to Step 3.
Repair or replace
defective parts.
Repair or replace
defective parts.
Faulty injection(s) or its
circuit.
Repair or replace
defective part.
Go to "DTC P0101:
Mass or Volume Air
Flow Circuit Range /
Performance".
Faulty ECT sensor or its
circuit.
Repair or replace
defective circuit.