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Home >> Infiniti >> 2001 >> I30 Base, RE4F04W >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0105: Absolute Pressure (AP) Sensor >> Procedure

DTC P0105: Absolute Pressure (AP) Sensor: Procedure

  1. Turn ignition off. Loosen and retighten 2 engine ground bolts located near oil filler cap. Disconnect AP sensor harness connector. See Fig 1. Inspect connector for water. If water exists, repair or replace connector as necessary and retest system. If water does not exist, go to next step.
  2. Turn ignition on. Measure voltage between ground and AP sensor harness connector terminal No. 1 (Red wire). If voltage is about 5 volts, go to next step. If voltage is not about 5 volts, repair circuit between ECM and AP sensor and retest system. See SYSTEM WIRING DIAGRAMS article.
  3. Turn ignition off. Check continuity between engine ground and AP sensor harness connector terminal No. 3 (Black wire). Also check circuit for short to voltage. Repair circuit as necessary and retest system. See SYSTEM WIRING DIAGRAMS article. If ground circuit is okay, go to next step.
  4. Disconnect ECM harness connector. See Figure. Check continuity of White wire between ECM harness connector terminal No. 80 and AP sensor harness connector terminal No. 2. See Figure. Also check circuit for short to ground and short to voltage. Repair circuit as necessary and retest system. If circuit is okay, go to next step.
    5. CAUTION: DO NOT use ECM ground terminals when measuring voltage.
  5. Reconnect all harness connectors. Remove AP sensor from its bracket and disconnect vacuum hose. Turn ignition on. Measure voltage between ground and ECM terminal No. 80 by backprobing. See Figure. Using a hand vacuum pump, apply vacuum to AP sensor. Voltage should decrease as vacuum is applied. See Fig 2. If voltage is not as specified, replace AP sensor and retest system. If voltage is as specified, go to next step.
  6. Turn ignition off. Disconnect connector F-46 (Blue, 12-pin J/C No. 18). See Figure. Check continuity between ground and connector F-46 terminal No. 2. See SYSTEM WIRING DIAGRAMS article. Also check circuit for short to voltage. Repair circuit as necessary and retest system. If shield circuit is okay, go to next step.
  7. No problem is indicated at this time. Problem may be intermittent. See INTERMITTENTS in TROUBLE SHOOTING - NO CODES article.
Fig 1: Locating Absolute Pressure (AP) Sensor
G00025043Courtesy of NISSAN MOTOR CO., U.S.A.
Fig 2: Checking Absolute Pressure (AP) Sensor Voltage
G99J08864Courtesy of NISSAN MOTOR CO., U.S.A.
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