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Home >> Nissan-Datsun >> 2003 >> Sentra Limited >> Repair and Diagnosis >> External Pages >> Different car >> Section 204 (Engine Controls - Self-Diagnostics - 1.8L - Ca) >> Diagnostic Tests >> DTC P0107 Or DTC P0108: Barometric Pressure (BARO) Sensor >> Diagnostic Procedure

Diagnostic Procedure

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.
  1. Turn ignition off. Loosen and retighten engine ground bolts located on intake manifold. See Figure . Disconnect BARO sensor harness connector. See Figure -Figure . Inspect connector for water. If water exists, repair or replace connector as necessary. If water does not exist, go to next step.
  2. Turn ignition on. Measure voltage between ground and terminal No. 1 (Red wire) at BARO sensor harness connector. See Fig 1 . If voltage is about 5 volts, go to next step. If voltage is not about 5 volts, repair open or short in Red wire between BARO sensor and PCM, then retest system.
  3. Turn ignition off. Check continuity between ground and terminal No. 3 (Black wire) at BARO sensor harness connector. Continuity should exist. Also check circuit for short to ground and short to voltage. If problem exists, repair as necessary and retest system. If problem does not exist, go to next step.
  4. Disconnect PCM harness connector. See Figure . Check continuity of White wire between terminal No. 83 at PCM harness connector and terminal No. 2 at BARO sensor harness connector. See Figure and Fig 1 . Continuity should exist. Also check circuit for short to ground and short to voltage. If problem exists, repair as necessary and retest system. If problem does not exist, go to next step.
  5. Reconnect all harness connectors. Remove BARO sensor from its bracket. Connect a vacuum pump to BARO sensor. Turn ignition on. Using a DVOM, backprobe between ground and terminal No. 83 (White wire) at PCM harness connector. Without vacuum applied to BARO sensor, voltage should be 3.2-4.8 volts. With 7.87 in. Hg of vacuum applied to BARO sensor, voltage should be 1.0-1.4 volts less than voltage measured with no vacuum applied. If voltage is not as specified, replace BARO sensor. If voltage is as specified, go to next step.
  6. No problem is indicated at this time. Problem may be intermittent. See TESTING PROCEDURE  under SELF-DIAGNOSTIC SYSTEM.
Fig 1: Barometric Pressure (BARO) Sensor Circuit Wiring Diagram
G00274256Courtesy of NISSAN MOTOR CO., U.S.A.
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