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DTC Detection Logic

WARNING: This page is about a different car, the 2009 Nissan Maxima. However, it is still accessible from the selected car via links, so may be relevant.

To judge the malfunction, the diagnosis checks that the A/F signal computed by ECM from the A/F sensor 1 signal is not inordinately low.

DTC DETECTION LOGIC CHART

DTC No. Trouble diagnosis name DTC detecting condition Possible Cause
P0131 Air fuel ratio (A/F) sensor 1 (bank 1) circuit low voltage
  • The A/F signal computed by ECM from the A/F sensor 1 signal is constantly approx. 0 V.
  • Harness or connectors (The sensor circuit is open or shorted.)
  • A/F sensor 1
P0151 Air fuel ratio (A/F) sensor 1 (bank 2) circuit low voltage
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