LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Infiniti >> 2002 >> I35 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P1143: Ho2S1 Lean Shift Monitoring - Bank 1 Or DTC P1163: Ho2S1 Lean Shift Monitoring - Bank 2 >> DTC Confirmation Test (Using Generic Scan Tool)
April 5, 2026: LEMON Manuals is launched! Read the announcement.

DTC Confirmation Test (Using Generic Scan Tool)

NOTE: Use the following test to check overall function of front HO2S circuit. During this test, 1st trip DTC may not be confirmed.
CAUTION: DO NOT use ECM ground terminals when measuring voltage.
  1. Start engine and warm to normal operating temperature. Measure voltage between ground and ECM terminal No. 91 (bank 1) or No. 92 (bank 2) by backprobing. See Figure and Figure .
  2. While observing voltmeter, increase engine speed to 2000 RPM. The following conditions should exist:
    • Maximum voltage should be more than .6 volt at least once.
    • Minimum voltage should be more than .1 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.

scientia non olet · About LEMON Manuals