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Power Steering Pressure (PSP) Switch System Test: FX35

  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 ground and PSP switch terminal No. 1. 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 as necessary.
  3. Turn ignition switch to OFF position. Check harness continuity between engine ground and PSP switch terminal No. 3. 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 next step. If problem is found, repair open circuit, short to ground or short to power as necessary.
  4. Disconnect ECM harness connector. Check harness continuity between ECM terminal No. 12 and PSP switch terminal No. 2. Continuity should exist. Also check harness for short to ground and short to power. If no problem is found, go to next step. If problem is found, repair open circuit or short to ground or short to power in harness or connectors.
  5. Check PSP switch. Reconnect all disconnected harness connectors. Start engine and let it idle. Check voltage between ground and ECM terminal No. 12 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.
  6. No problem is indicated at this time. Problem may be intermittent. See INTERMITTENTS in TROUBLE SHOOTING - NO CODES article.
Fig 1: Locating Engine Ground (FX35)
G00221713Courtesy of NISSAN MOTOR CO., U.S.A.
Fig 2: Locating & Testing PSP Switch (FX35)
G00221714Courtesy of NISSAN MOTOR CO., U.S.A.
POWER STEERING PRESSURE SWITCH VOLTAGE TEST

Condition Voltage
FX35 & FX45
Steering Wheel Not Turned 0.4-0.8
Steering Wheel Turned Fully 0.5-4.5
I35, M45 & Q45
Steering Wheel Not Turned 0.6
Steering Wheel Turned Fully 3.6
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