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Home >> Nissan-Datsun >> 2003 >> Sentra Limited >> Repair and Diagnosis >> External Pages >> Different car >> Section 39 (Engine Controls - Self-Diagnostics - 1.8L - XE, GXE) >> Diagnostic Tests >> DTC P0138 Or DTC P0158 >> DTC Confirmation Test

DTC Confirmation Test

WARNING: This page is about a different car, the 2002 Nissan Sentra. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION: Always drive vehicle at a safe speed.
NOTE: If DTC confirmation test has been previously performed, always turn ignition off and wait at least 10 seconds before performing the next test.

With CONSULT-II

  1. Turn ignition on. Select DATA MONITOR mode with CONSULT-II. Start engine. Drive vehicle at a speed of more than 43 MPH for 2 consecutive minutes. Stop vehicle with engine running. Let engine idle for one minute.
  2. Maintain the following conditions for at least 5 consecutive seconds:
    • ENG SPEED: 1000-3000 RPM (A/T) or 1000-3600 RPM (M/T).
    • VHCL SPEED SE: 42-81 MPH.
    • B/FUEL SCHDL: 2.0-12.5 msec (A/T) or 2.0-10.0 msec (M/T).
  3. If 1st trip DTC is detected, go to DIAGNOSTIC PROCEDURE  . If 1st trip DTC is not detected, system is okay at this time.
NOTE: Use the following test to check overall function of HO2S2 circuit. During this test, 1st trip DTC may not be confirmed.

Without CONSULT-II (Overall Function Check)

  1. Start engine. Drive vehicle at a speed of more than 43 MPH for 2 consecutive minutes. Stop vehicle with engine running.
  2. Measure voltage between ground and ECM terminal No. 63 (bank 1) or No. 95 (bank 2) by backprobing. See Figure . See Figure or Figure .
  3. While monitoring voltage, snap throttle to 4000 RPM at least 10 times. Voltage should remain less than 2 volts during this procedure.
  4. If voltage is not as specified, go to DIAGNOSTIC PROCEDURE  . If voltage is as specified, system is okay at this time.
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