Suzuki 2006 SX4, Service Manual

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Engine General Information and Diagnosis: 1A-63
DTC Detecting Condition and Trouble Area
DTC Confirmation Procedure
NOTE
Check to make sure that the 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)
• The following DTCs are not detected: DTC P0171 / P0172 / P0300 / P0301 / P0302 / P0303 / P0304 and
DTCs related to ECT sensor, IAT sensor, Barometric pressure sensor, TP sensor and MAF sensor
(other than P0101)
1) With ignition switch OFF, connect scan tool.
2) Turn ON ignition switch and clear DTC by using scan tool.
3) Start engine and run it at idle for 1 min.
4) Stop vehicle and check DTC and pending DTC.
DTC Troubleshooting
DTC detecting condition Trouble area
MAF sensor signal is higher or lower than estimated range based on
engine speed and throttle angle for 7 sec.
(2 driving cycle detection logic) • Air intake system (Clog or leakage)
• MAF sensor and/or its circuit
• Exhaust system (clogged WU-TWC
converter)
• TP sensor and/or its circuit
• ECM
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 Visual inspection
1) Check MAF sensor and air intake system for:
• Objects which block measuring duct and resistor of
MAF sensor.
• Other air flow which does not pass the MAF sensor.
Are they in good condition?
Go to Step 3. Repair or replace.
3 MAF sensor performance check
1) With ignition switch OFF, connect scan tool to DLC.
2) Start engine and warm up to normal operation
temperature.
3) Check MAF value using scan tool. (Refer to “Scan Tool
Data” for normal value.)
Is normal valve indicated?
Intermittent trouble.
Check for intermittent
referring to “Intermittent
and Poor Connection
Inspection in Section
00”. Go to Step 4.
4 Wire harness check
1) Check power supply, signal and ground circuits of MAF
sensor for condition referring to Step 3 and 4 of “DTC
P0102 / P0103: Mass or Volume Air Flow Circuit Low /
High Input”.
Are they in good condition?
Go to Step 5. Repair or replace.