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Power Steering Pressure Switch System Test

  1. Start engine and bring to operating temperature. Measure voltage between ECM harness connector terminal No. 34 (Green wire) and ground. Turn steering wheel quickly; approximately zero volts should be present. When steering wheel is not being turned, 4-6 volts should be present. If voltage is not as specified, go to next step. If voltage is as specified, system is functioning properly.
  2. Turn ignition off. Disconnect and inspect power steering pressure switch harness connector for pushed-out, bent, damaged or corroded terminals. Repair connector as necessary. Check continuity between power steering pressure switch harness connector Black wire and ground. Continuity should exist. If continuity exists, go to next step. If continuity does not exist, repair open in Black wire or connectors.
  3. Disconnect and inspect ECM harness connector for pushed-out, bent, damaged or corroded terminals. Repair connector as necessary. Check continuity between ECM harness connector terminal No. 34 (Green wire) and power steering pressure switch harness connector Green wire. Continuity should exist. If continuity exists, check power steering pressure switch. See POWER STEERING PRESSURE SWITCH TEST. If continuity does not exist, repair open in Green wire or connectors.
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