LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Nissan-Datsun >> 2003 >> Frontier Base, Automatic >> Repair and Diagnosis (Single Page) >> Engine Performance >> Engine Control Systems >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0139: Ho2S2 Circuit Slow Response - Bank 1 Or DTC P0159: Ho2S2 Circuit Slow Response - 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 HO2S2 circuit. During this test, 1st trip DTC may not be confirmed.
  1. Start engine and warm to normal operating temperature. Turn ignition off and wait at least 10 seconds. Start engine and keep engine speed at 3500-4000 RPM for at least one minute with no load. Allow engine to idle for one minute.
  2. On 2.4L models, measure voltage between ground and ECM terminal No. 56 by backprobing. See Figure or Figure . See Figure . On 3.3L models, measure voltage between ground and ECM terminal No. 56 (bank 1) or No. 57 (bank 2) by backprobing.
  3. On all models, while observing voltmeter, snap throttle to 4000 RPM at least 10 times. Voltage should change at a rate of more than 0.06 volt per second during this procedure.
  4. If voltage is as specified, system is okay at this time. If voltage is not as specified, go to next step.
  5. Let engine idle for 10 minutes, then measure voltage again. Or, measure voltage while coasting from 50 MPH in 3rd gear. If voltage is as specified, system is okay at this time. If voltage is not as specified, go to appropriate DIAGNOSTIC PROCEDURE.
scientia non olet · About LEMON Manuals