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Home >> Suzuki >> 2006 >> XL-7 Base, 4WD, Standard >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine General Information And Diagnosis >> Diagnostic Information and Procedures >> DTC P0171 / P0174: System Too Lean >> DTC Troubleshooting
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DTC Troubleshooting

DTC DIAGNOSTIC TROUBLESHOOTING CHART

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 "DTC P0171 / P0174"?  Go to applicable DTC flow. Go to Step 3.
3 
  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.
4 
  1. Check fuel pressure referring to FUEL PRESSURE CONTROL SYSTEM INSPECTION .

Is check result satisfactory? 		 Go to Step 5. Repair or replace.
5 
  1. Check fuel injectors referring to FUEL INJECTOR INSPECTION .

Is check result satisfactory? 		 Go to Step 6. Faulty injector(s).
6 
  1. Check fuel level sensor referring to DTC P0461: Fuel Level Sensor Circuit Performance .

Is check result satisfactory? 		 Go to Step 7. Faulty fuel level sensor or its circuit.
7 
  1. Check MAF sensor for performance referring to DTC P0101: Mass Air Flow Circuit Performance .

Is check result satisfactory? 		 Go to Step 8. Faulty MAF sensor or its circuit.
8 
  1. Check ECT sensor referring to ENGINE COOLANT TEMPERATURE (ECT) SENSOR INSPECTION .

Is check result satisfactory? 		 Go to Step 9. Faulty ECT sensor.
9 
  1. Check HO2S-1 referring to DTC P0131 / P0132: O2 Sensor (Bank 1 Sensor -1) Circuit Low Voltage / High Voltage  or DTC P0151 / P0152: O2 Sensor (Bank 2 Sensor-1) Circuit Low Voltage / High Voltage .

Is check result satisfactory? 		 Substitute a known-good ECM and recheck. Faulty HO2S-1.
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