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Home >> Infiniti >> 2003 >> I35 >> Repair and Diagnosis >> External Pages >> Different car >> Section 237 (Engine Control System) >> DTC P1144 & DTC P1164: Ho2S1 >> Overall Function Check >> With GST

With GST

WARNING: This page is about a different car, the 2004 Infiniti I35. However, it is still accessible from the selected car via links, so may be relevant.
  1. Start engine and warm it up to normal operating temperature.
  2. Set voltmeter probes between ECM terminal 91 (HO2S1 bank 1 signal) or 92 (HO2S1 bank 2 signal) and engine ground.
    Fig 1: Checking Heated Oxygen Sensor 1 Circuit Overall Function
    G00787099Courtesy of NISSAN MOTOR CO., U.S.A.
  3. Check one of the following with engine speed held at 2,000 rpm constant under no load.
    • The maximum voltage is below 0.8V at least one time.
    • The minimum voltage is below 0.35V at least one time.
  4. If NG, go to DIAGNOSTIC PROCEDURE  .
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