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Power Steering Pressure Switch: Highlander

WARNING: This page does not describe the selected car, but rather 10 other vehicles, including the 2002 Toyota Tacoma, 2002 Toyota RAV4, 2002 Toyota Prius, 2002 Toyota MR2, and 2002 Toyota Highlander. However, it is still accessible from the selected car via links, so may be relevant.
  1. Remove glove box for access to Engine Control Module (ECM). For illustration of ECM location, see THEORY & OPERATION article. Note ECM electrical connector terminals. See Figure.
  2. Start engine and allow engine to idle. Using voltmeter, check voltage between terminals No. 11 (Green/Yellow wire) at ECM electrical connector E7 and No. 17 (Brown wire) at ECM electrical connector E8. This is the PSW and E1 terminals at ECM. Check voltage with steering wheel at stationary position with engine idling, and while turning steering wheel with engine idling. Voltage should be 9-14 volts with steering wheel at stationary position and 0-3 volts while turning the steering wheel. If voltage is within specification, test is complete. If voltage is not within specification, go to next step.
  3. Check wiring harness and electrical connectors between ECM and power steering pressure switch. See WIRING DIAGRAMS article. Power steering pressure switch is located on power steering pump. If wiring harness or electrical connector is defective, repair as necessary. If wiring harness and electrical connectors are okay, replace power steering pressure switch. See POWER STEERING PRESSURE SWITCH under ENGINE SENSORS & SWITCHES in REMOVAL, OVERHAUL & INSTALLATION - 4-CYLINDER article.
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