LEMON Manuals: Even more car manuals for everyone
Home >> Nissan-Datsun >> 2003 >> Sentra Limited >> Repair and Diagnosis >> External Pages >> Different car >> Section 40 (Engine Controls - Self-Diagnostics - 2.5) >> Diagnostic Tests >> DTC P0221, DTC P0222 Or DTC P0223 >> 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. If malfunction "A" or "B" was duplicated, go to next step. If malfunction "C" was duplicated, adjust TP sensor. See ON-VEHICLE ADJUSTMENTS article. Check air intake duct and vacuum hoses for leaks or disconnection. Reconnect or repair as necessary and retest system. If no problems are found, go to next step.
  2. Turn ignition off. Loosen and retighten engine ground bolts. See Figure and Figure . Disconnect TP sensor harness connector. See Fig 1. Turn ignition on. Measure voltage between ground and TP sensor harness connector terminal No. 3 (Red wire). 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 TP sensor and ECM and retest system.
  3. Turn ignition off. Check continuity between ground and TP sensor harness connector terminal No. 1 (Black wire). Continuity should exist. Also, check circuit for short to voltage. See 2.5L under ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS in ELECTRICAL. Repair circuit as necessary and retest system. If problem does not exist, go to next step.
  4. Turn ignition off. Disconnect ECM harness connector. See Figure. Check continuity of Yellow wire between ECM harness connector terminal No. 92 and TP sensor harness connector terminal No. 2. See Figure and Fig 2 . Continuity should exist. 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. Start engine and warm to normal operating temperature. Stop engine and turn ignition on. Disconnect vacuum hose from throttle opener. Connect a hand-held vacuum pump to throttle opener vacuum port. Apply 11.81 in. Hg. Measure voltage between ground and ECM terminal No. 92 (Yellow wire) by backprobing, with throttle in specified positions. See THROTTLE POSITION (TP) SENSOR VOLTAGE . If voltage is not as specified, go to next step. If voltage is as specified, go to step  7.
  6. Adjust closed throttle position switch. See ON-VEHICLE ADJUSTMENTS article. Repeat step  5. If voltage is now as specified, go to next step. If voltage is still not as specified, replace TP sensor and retest system.
  7. If malfunction "A" or "C" was duplicated, go to step  12. If malfunction "B" was duplicated, go to next step.
  8. Start engine and warm to normal operating temperature. Measure voltage between ground and ECM terminal No. 61 (Green wire), with engine at specified speeds. See MASS AIRFLOW SENSOR VOLTAGE SPECIFICATIONS  under DTC P0101: MASS AIRFLOW (MAF) SENSOR. Go to next step.
  9. If voltage is as specified, go to next step. If voltage is not as specified, disconnect and reconnect MAF sensor harness connector and repeat step  8. If voltage is still not as specified, replace MAF sensor and retest system. If voltage is now as specified, go to next step.
    10. CAUTION: DO NOT use ECM ground terminals when measuring voltage.
  10. Ensure engine is at normal operating temperature. On models with NVIS, measure voltage between ground and ECM terminals No. 66 and 75 (both Red wires) by backprobing. On models without NVIS, measure voltage between ground and ECM terminals No. 76 and 85 (both Red wires) by backprobing. On all models, see PIN VOLTAGE CHARTS article for specifications. If voltages or waveforms are as specified, go to next step. If voltages or waveforms are not as specified, replace camshaft position sensor and retest system.
  11. Turn ignition off. Disconnect fuel injector harness connector. Measure resistance between fuel injector terminals (component side). Resistance should be 13.5-17.5 ohms at 68°F (20°C). If resistance is as specified, go to next step. If resistance is not as specified, replace defective fuel injector(s) as necessary and retest system.
  12. No problem is indicated at this time. Problem may be intermittent. See INTERMITTENTS in TROUBLESHOOTING - NO CODES article.
THROTTLE POSITION (TP) SENSOR VOLTAGE

Throttle Position Volts
Fully Closed .15-.85
Between Fully Closed & Fully Open .15-.85 To 3.5-4.7
Fully Open 3.5-4.7
Fig 1: Locating TP Sensor & TP Switch Harness Connectors
G00015021Courtesy of NISSAN MOTOR CO., U.S.A.
Fig 2: Identifying TP Sensor & TP Switch Terminals (Component Side Shown)
G00042083Courtesy of NISSAN MOTOR CO., U.S.A.
scientia non olet · About LEMON Manuals