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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 P0138, P0158: Ho2S2 >> Overall Function Check >> Procedure For Malfunction B >> With GST
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With GST

  1. Start engine and warm it up to the normal operating temperature.
  2. Turn ignition switch OFF and wait at least 10 seconds.
  3. Turn ignition switch ON.
  4. Turn ignition switch OFF and wait at least 10 seconds.
  5. Start engine and keep the engine speed between 3, 500 and 4, 000 RPM for at least 1 minute under no load.
  6. Let engine idle for 1 minute.
  7. Set voltmeter probes between ECM terminal 74 [HO2S2 (B1) signal] or 55 [HO2S2 (B2) signal] and ground.
  8. Check the voltage when revving up to 4, 000 RPM under no load at least 10 times.
    Fig 1: Setting Voltmeter Probes Between ECM Terminal 74 HO2S2 (B1) Signal] And 55 HO2S2 (B2) Signal And Ground
    G06441349Courtesy of SUZUKI OF AMERICA CORP.

    (Depress and release accelerator pedal as soon as possible.)

    The voltage should be below 0.18V at least once during this procedure. 

    If the voltage can be confirmed in step   6 , step   7  is not necessary. 

  9. Keep vehicle at idling for 10 minutes, then check the voltage. Or check the voltage when coasting from 80 km/h (50 MPH) in D position with "OD" OFF (A/T), 5th gear position (M/T).

    The voltage should be below 0.18V at least once during this procedure. 

  10. If NG, go to [P0138, P0158 HO2S2 ].
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