Suzuki 2006 SX4, Service Manual

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1A-82 Engine General Information and Diagnosis:
DTC Troubleshooting
Step Action Yes No
1 Was “Engine and Emission Control System Check”
performed? Go to Step 2. Go to “Engine and
Emission Control
System Check”.
2 Is there DTC(s) other than fuel system (DTC P0171 / P0172
/ 2195 / 2196)? Go to applicable DTC
diag. flow. Go to Step 3.
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?
Go to Step 4. Repair or replace
defective parts.
4 Fuel pressure check
1) Check fuel pressure referring to “Fuel Pressure Check”.
Is check result satisfactory?
Go to Step 5. Repair or replace
defective parts.
5 Fuel injectors and its circuit check
1) Check fuel injectors referring to “Fuel Injector Inspection
in Section 1G”.
Is check result satisfactory?
Go to Step 6. Faulty injection(s) or its
circuit.
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?
Go to Step 7. Repair or replace
defective part.
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?
Go to Step 8. Go to “DTC P0101:
Mass or Volume Air
Flow Circuit Range /
Performance”.
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?
Go to Step 9. Faulty ECT sensor or its
circuit.
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?
Replace A/F sensor and
recheck. If this DTC is
detected again,
substitute a known-
good ECM. Repair or replace
defective circuit.