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Home >> Suzuki >> 2009 >> Equator Base, 4D Pickup >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (VQ40DE) - (4 Of 5) >> DTC P0102, P0103: MAF Sensor >> Diagnosis Procedure
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Diagnosis Procedure

DIAGNOSIS PROCEDURE

Step Action YES NO
1  INSPECTION START 
Which malfunction (P0102 or P0103) is duplicated?
P0102 or P0103 		 GO TO 2. GO TO 3.
2  CHECK INTAKE SYSTEM 
Check the following for connection.
  • Air duct
  • Vacuum hoses
  • Intake air passage between air duct and intake manifold

OK or NG 		 GO TO 3. Reconnect the parts.
3  CHECK GROUND CONNECTIONS 
  1. Turn ignition switch OFF.
  2. Loosen and retighten three ground screws on the body. Refer to [POWER SUPPLY AND GROUND CIRCUIT CHECK ].
G06441265Courtesy of SUZUKI OF AMERICA CORP.

OK or NG 		 GO TO 4. Repair or replace ground connections.
4  CHECK MAF SENSOR POWER SUPPLY CIRCUIT 
  1. Disconnect mass air flow (MAF) sensor harness connector.
G06441266G06441267Courtesy of SUZUKI OF AMERICA CORP.SUZUKI OF AMERICA CORP.

  1. 2. Turn ignition switch ON.
  2. 3. Check voltage between MAF sensor terminal 2 and ground with SDT or tester.
G06441266G06441267Courtesy of SUZUKI OF AMERICA CORP.SUZUKI OF AMERICA CORP.

Voltage: Battery voltage 
OK or NG 		 GO TO 6. GO TO 5.
5  DETECT MALFUNCTIONING PART 
Check the following.
  • Harness connectors E2, F32
  • Harness for open or short between IPDM E/R and mass air flow sensor
  • Harness for open or short between mass air flow sensor and ECM
 Repair open circuit or short to ground or short to power in harness or connectors.  
6  CHECK MAF SENSOR GROUND CIRCUIT FOR OPEN AND SHORT 
  1. Turn ignition switch OFF.
  2. Disconnect ECM harness connector.
  3. Check harness continuity between MAF sensor terminal 3 and ECM terminal 67.

    Refer to WIRING DIAGRAM .

    Continuity should exist. 

  4. Also check harness for short to ground and short to power.

OK or NG 		 GO TO 7. Repair open circuit or short to ground or short to power in harness or connectors.
7  CHECK MAF SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT 
  1. Check harness continuity between MAF sensor terminal 4 and ECM terminal 51.

    Refer to WIRING DIAGRAM .

    Continuity should exist. 

  2. Also check harness for short to ground and short to power.

OK or NG 		 GO TO 8. Repair open circuit or short to ground or short to power in harness or connectors.
8  CHECK MASS AIR FLOW SENSOR 
Refer to [P0101 MAF SENSOR ].
OK or NG 		 GO TO 9. Replace mass air flow sensor.
9  CHECK INTERMITTENT INCIDENT 
Refer to [SERVICE INFORMATION FOR ELECTRICAL INCIDENT: INTERMITTENT INCIDENT ]		 INSPECTION END   
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