Suzuki SX4 Service Manual page 154

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1A-104 Engine General Information and Diagnosis:
DTC Troubleshooting
NOTE
Before this troubleshooting is performed, read the precautions for DTC troubleshooting referring to
"Precautions for DTC Troubleshooting".
Step
1
Was "Engine and Emission Control System Check"
performed?
2
Is there DTC(s) other than fuel system (DTC P0171 /
P0172)?
3
Intake system and exhaust system for leakage check
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
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, install scan tool.
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 referring to Step 3 and 4 of "DTC
P0118: Engine Coolant Temperature Circuit High".
Is check result satisfactory?
9
HO2S-1 for performance check
1) Check HO2S-1 referring to Step 3 of "DTC P0131 /
P0132: O2 Sensor (HO2S) Circuit Low Voltage / High
Voltage (Sensor-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.
Substitute a known-
good ECM and recheck.
No
Go to "Engine and
Emission Control
System Check".
Go to Step 3.
Repair or replace
defective part.
Repair or replace
defective part.
Faulty injector(s) or its
circuit.
Repair or replace
defective part.
Go to "DTC P0101:
Mass Air Flow Circuit
Range / Performance".
Faulty ECT sensor or its
circuit.
Faulty HO2S-1 or its
circuit.

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