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Home >> Nissan-Datsun >> 2003 >> Sentra Limited >> Repair and Diagnosis >> External Pages >> Different car >> Section 38 (Engine Controls - Self-Diagnostics) >> Diagnostic Tests >> DTC P1229: Sensor Power Supply Circuit Shorted >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2002 Nissan Maxima and 2002 Infiniti I35. However, it is still accessible from the selected car via links, so may be relevant.
  1. Turn ignition off. Loosen and retighten 2 engine ground bolts. See Figure . Disconnect electric throttle control actuator harness connector. See Figure . Turn ignition on. Measure voltage between ground and electric throttle control actuator harness connector terminal No. 1 (Red wire). If voltage is about 5 volts, go to step  4 . If voltage is not about 5 volts, go to next step.
  2. Check short to ground and short to voltage in Red wire between ECM harness connector terminal No. 111 and the following:
    • Electric throttle control actuator harness connector terminal No. 1.
    • APP sensor harness connector terminal No. 6.
    • MAF sensor harness connector terminal No. 2.
    • EVAP-CSPS harness connector terminal No. 1.
    • PSP sensor harness connector terminal No. 1.
    • Refrigerant pressure sensor harness connector terminal No. 1 (Red/Blue wire).

    See Figure and Figure . Also, inspect ECM pins for damage. If problem is found, repair as necessary. If problem is not found, go to next step.

  3. Check the following:
    • APP sensor. See step  13 under DIAGNOSTIC PROCEDURE under DTC P0226, DTC P0227 OR DTC P0228: ACCELERATOR PEDAL POSITION SENSOR.
    • MAF sensor. See DIAGNOSTIC PROCEDURE  under DTC P0101: MASS AIRFLOW SENSOR.
    • EVAP-CSPS. See DIAGNOSTIC PROCEDURE  under DTC P0452: EVAP CONTROL SYSTEM PRESSURE SENSOR.
    • PSP sensor. See step  4 under DIAGNOSTIC PROCEDURE under DTC P0550: POWER STEERING PRESSURE SENSOR.
    • Refrigerant pressure sensor. See SYSTEM & COMPONENT TESTING article.

    If problem is found, repair as necessary. If problem is not found, go to step  6 .

  4. Check TP sensor. See step  4 under DIAGNOSTIC PROCEDURE under DTC P0221, DTC P0222 OR DTC P0223: TP SENSOR. If problem is found, go to next step. If problem is not found, go to step  6 .
  5. Replace electric throttle control actuator. Perform throttle valve closed position learning and idle air volume learning. See PROGRAMMING  .
  6. No problem is indicated at this time. Problem may be intermittent. See INTERMITTENTS in TROUBLE SHOOTING - NO CODES article.
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