LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Infiniti >> 2003 >> QX4 4WD >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0134: Bank 1 Heated Oxygen Sensor 1 Circuit - No Activity Detected Or DTC P0154: Bank 2 Heated Oxygen Sensor 1 Circuit - No Activity Detected >> DTC Confirmation Test (Using Generic Scan Tool)
April 5, 2026: LEMON Manuals is launched! Read the announcement.

DTC Confirmation Test (Using Generic Scan Tool)

CAUTION: DO NOT use ECM ground terminals when measuring voltage.
NOTE: Use the following test to check overall function of HO2S 1 circuit. During this test, 1st trip DTC may not be confirmed.
  1. Start engine and warm to normal operating temperature. Backprobing at ECM, measure voltage between ground and ECM terminal No. 63 (bank 1) or No. 62 (bank 2). See Figure.
  2. While observing voltmeter, increase engine speed to 2000 RPM. If voltage remains in 2-.4 volt range, go to DIAGNOSTIC PROCEDURE . If voltage is as specified, system is okay at this time.
scientia non olet · About LEMON Manuals