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Home >> Nissan-Datsun >> 2004 >> Frontier Base, Automatic >> Repair and Diagnosis >> Engine Performance >> Engine Control System - KA24DE >> DTC P1148: Closed Loop Control >> Overall Function Check >> With GST
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With GST

  1. Start engine and warm it up to normal operating temperature.
  2. Set voltmeter probes between ECM terminal 50 (Heated oxygen sensor 1 signal) and engine ground.
    Fig 1: Checking Voltage Between ECM Terminal And Engine Ground
    G00855975Courtesy of NISSAN MOTOR CO., U.S.A.
  3. Check the following with engine speed held at 2,000 RPM constant under no load.
    • The voltage should go above 0.70V at least once.
    • The voltage should go below 0.21V at least once.
  4. If NG, go to "DIAGNOSTIC PROCEDURE ".
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