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Home >> Nissan-Datsun >> 2004 >> Sentra SE-R >> Repair and Diagnosis >> External Pages >> Different car >> Section 7 (Engine Controls - Self-Diagnostics - Q45) >> Diagnostic Tests >> DTC P1148: Bank 1, Or P1168: Bank 2 Closed Loop Control >> DTC Confirmation Test (Using Generic Scan Tool)
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DTC Confirmation Test (Using Generic Scan Tool)

WARNING: This page is about a different car, the 2002 Infiniti Q45. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Use the following test to check closed loop fuel control. During this test, DTC may not be confirmed.
CAUTION: DO NOT use ECM ground terminals when measuring voltage.
  1. To check closed loop operation, start engine and warm to normal operating temperature. Measure voltage between ground and left front HO2S signal circuit (Red/Blue wire) at ECM terminal 114 or right front HO2S signal circuit (Blue/White wire) at ECM terminal 115, by backprobing. See Figure and Figure .
  2. Monitor voltmeter with engine at 2000 RPM. Voltage should be less than .21 volt at least once and more than .70 volt at least once. If voltage is not as specified, go to DIAGNOSTIC PROCEDURE . If voltage is as specified, system is okay at this time.
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