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Home >> Nissan-Datsun >> 2004 >> Sentra SE-R Spec V >> Repair and Diagnosis (Single Page) >> External Pages >> Different car >> Section 108 (Engine Controls - System & Component Testing) >> Sensors & Switches >> Power Steering Pressure (PSP) Switch System Test >> I35
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Power Steering Pressure (PSP) Switch System Test: I35

WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2003 Infiniti QX4, 2003 Infiniti Q45, 2003 Infiniti M45, 2003 Infiniti I35, and 2003 Infiniti G35. However, it is still accessible from the selected car via links, so may be relevant.
  1. Turn ignition switch to OFF position. Loosen and retighten engine ground screws. See Fig 1. Go to next step.
  2. Disconnect PSP switch harness connector. See Fig 2. Turn ignition switch to ON position. Check voltage between PSP switch terminal No. 1 and ground. Voltage should be about 5 volts. If voltage is as specified, go to next step. If voltage is not as specified, repair harness or connectors.
  3. Turn ignition switch to OFF position. Check harness continuity between PSP switch terminal No. 3 and engine ground. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Continuity should exist. Also check harness for short to power. If no problem is found, go to step  5. If problem is found, go to next step.
  4. Check the following:
    • Harness for open or short between ECM and PSP switch.
    • Harness for open or short between TCM and PSP switch.

    Repair open circuit or short to ground or short to power in harness in connectors.

  5. Disconnect ECM harness connector. Check harness continuity between ECM terminal No. 89 and PSP switch terminal No. 2. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Continuity should exist. Also check harness for short to ground and short to power. If results are as specified, go to next step. If results are not as specified, repair open circuit or short to ground or short to power in harness or connectors.
  6. Check PSP switch. Reconnect all disconnected harness connectors. Start engine and let it idle. Check voltage between ground and ECM terminal No. 89 under specified conditions. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. See POWER STEERING PRESSURE SWITCH VOLTAGE TEST  table. If power steering pressure switch is okay, go to next step. If power steering pressure switch is not okay, replace power steering pressure switch.
  7. No problem is indicated at this time. Problem may be intermittent. See INTERMITTENTS in TROUBLE SHOOTING - NO CODES article.
Fig 1: Identifying Engine Ground Screws (I35)
G00220075Courtesy of NISSAN MOTOR CO., U.S.A.
Fig 2: Identifying PSP Switch (I35)
G00220076Courtesy of NISSAN MOTOR CO., U.S.A.
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