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Home >> Nissan-Datsun >> 2003 >> Sentra Limited >> Repair and Diagnosis >> External Pages >> Different car >> Section 68 (Engine Controls Self-Diagnostics - Pathfinder & QX4) >> Diagnostic Tests >> DTC P1148: Bank 1 Closed Loop Control Not Obtained Or DTC P1168: Bank 2 Closed Loop Control Not Obtained >> DTC Confirmation Test (Using Generic Scan Tool)

DTC Confirmation Test (Using Generic Scan Tool)

WARNING: This page is about a different car, the 2002 Nissan Pathfinder and 2002 Infiniti QX4. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION: DO NOT use ECM ground terminals when measuring voltage.
NOTE: Use the following test to check overall function of closed loop fuel control. During this test, DTC may not be confirmed.
  1. Start engine and warm to normal operating temperature. Backprobbing at ECM, measure voltage between ground and ECM terminal No. 63 (bank 1) or No. 62 (bank 2). 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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