Suzuki SX4 Service Manual page 171

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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
Do you have SUZUKI scan tool?
3
EGR valve operation check
1) With ignition switch turned OFF, install SUZUKI scan tool
to DTC.
2) Check EGR system referring to "EGR System Inspection
(If Equipped) in Section 1B".
Is it in good condition?
4
MAP sensor check
1) Check MAP sensor for performance referring to
"Manifold Absolute Pressure (MAP) Sensor Inspection
(If Equipped) in Section 1C".
Is check result satisfactory?
5
EGR valve control circuit check
1) Check that EGR valve control circuits are in good
condition referring to Step 2 to 5 of "DTC P0403:
Exhaust Gas Recirculation Control Circuit"
Are circuits in good condition?
6
EGR valve check
1) Check EGR valve referring to "EGR Valve Inspection (If
Equipped) in Section 1B".
Is check result satisfactory?
7
MAP sensor check
1) Check MAP sensor for performance referring to
"Manifold Absolute Pressure (MAP) Sensor Inspection
(If Equipped) in Section 1C".
Is check result satisfactory?
Action
Engine General Information and Diagnosis:
Yes
Go to Step 2.
Go to Step 3.
Go to Step 4.
Intermittent trouble or
faulty ECM.
Check for intermittent
referring to "Intermittent
and Poor Connection
Inspection in Section
00".
Go to Step 6.
Go to Step 7.
EGR passage clogged.
If OK, substitute a
known-good ECM and
recheck.
1A-121
No
Go to "Engine and
Emission Control
System Check".
Go to Step 5.
Go to Step 5.
Replace MAP sensor.
Repair or replace EGR
valve control circuit(s).
Faulty EGR valve.
Replace MAP sensor.

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