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Home >> Suzuki >> 2006 >> Grand Vitara Luxury, RWD >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine General Information And Diagnosis >> Diagnostic Information And Procedures >> DTC P0102/P0103: Mass Air Flow Circuit Low/High Input >> DTC Troubleshooting
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DTC Troubleshooting

DTC 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  MAF sensor and its circuit check 
  1. Connect scan tool to DLC with ignition switch turned OFF.
  2. Start engine and check MAF value displayed on scan tool. (Refer to SCAN TOOL DATA  for normal value).

Is normal value indicated? 		 Intermittent trouble. Check for intermittent referring to INTERMITTENT AND POOR CONNECTION INSPECTION . Go to Step 3.
3  MAF sensor power supply voltage check 
  1. Disconnect connector from MAF sensor with ignition switch turned OFF.
  2. Check for proper terminal connection to MAF sensor and ECM connectors
  3. If connections are OK, turn ignition switch to ON position.
  4. Check that MAF sensor power supply voltage is battery voltage.
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Is it in good condition? 		 Go to Step 4. Repair or replace MAF sensor power supply circuit.
4  Wire harness check 
  1. Turn ignition switch OFF position.
  2. Disconnect connector from ECM.
  3. Check that MAF sensor circuit is as follows.
    • Wiring harness resistance of each MAF sensor signal circuit and ground circuit is less than 3 Ω.
    • Insulation resistance between MAF sensor signal circuit and vehicle body ground is Infinity.
    • Insulation resistance of wire harness is infinity between MAF sensor signal terminal and each other terminal at MAF and IAT sensor connector.
    • Circuit voltage of each MAF sensor signal circuit and ground circuit is 0 - 1 V with ignition switch turned ON.

Are they in good condition? 		 Go to Step 5. Repair or replace defective wire harness.
5  MAF sensor signal check 
  1. Turn ignition switch OFF position.
  2. Connect connectors to MAF sensor and ECM.
  3. Check MAF sensor signal voltage referring to MASS AIR FLOW (MAF) AND INTAKE AIR TEMPERATURE (IAT) SENSOR ON-VEHICLE INSPECTION .

Is each value within specified range? 		 Substitute a known-good ECM and recheck. Replace MAF and IAT sensor.
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