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Home >> Nissan-Datsun >> 2007 >> X-Trail LE >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - DTCS P1148 To P2138 >> DTC P1148 Closed Loop Control >> Overall Function Check
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Overall Function Check

Use this procedure to check the overall function of the closed loop control. During this check, a DTC might not be confirmed.

WITH GST 

  1. Start engine and warm it up to normal operating temperature.
  2. Set voltmeter probes between ECM terminal 35 [HO2S1 (B1) signal] and ground.
    Fig 1: Checking Voltmeter Probes Between ECM Terminal 35 And Ground
    G06152811Courtesy 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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