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Home >> Nissan-Datsun >> 2002 >> Sentra SE-R, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics - 2.5 >> Diagnostic Tests >> DTC P1148: Closed Loop Control Function >> DTC Confirmation Test (Overall Function Check)
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DTC Confirmation Test (Overall Function Check)

NOTE: Use the following test to check overall function of closed-loop fuel control. During this test, first trip DTC may not be confirmed.
CAUTION: DO NOT use ECM ground terminals when measuring voltage.

To check overall function of closed-loop fuel control, start engine and warm to normal operating temperature. Measure voltage between ground and ECM terminal No. 92 (White/Green wire) by backprobing. See Figure and Figure . Monitor voltmeter with engine at 2000 RPM. Voltage should be less than 0.21 volt at least once, and more than 0.70 volt at least once. If voltage is not as specified, perform DIAGNOSTIC PROCEDURE .

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