1987 Jeep Cherokee LimitedFACTORY OEM SERVICE PROCEDURE

Turbo Boost Cut-Out Switch

  1. Disconnect hose from test point "A". See Fig 1. Connect a pressure gauge to hose. Start and run engine at 3000 RPM. Record pressure reading. Disconnect gauge and reconnect hose.
    NOTE: If no pressure is indicated, check turbocharger operation, and for a pinched hose between manifold and turbo boost cut-out switch.
  2. Disconnect hose from test point "B". See Fig 1. Connect a pressure gauge to hose. Start and run engine at 3000 RPM. Record pressure reading. Pressure reading should be equal to reading at test point "A" in step 1.
  3. If pressure is okay, turbo boost cut-out switch is operating correctly. If pressure is not okay, and engine coolant temperature is below 239°F (115°C), replace cut-out switch. Disconnect gauge and reconnect hose.
Fig 1: Testing Turbo Boost Cut-Out Switch
G10568Courtesy of AMERICAN MOTORS/JEEP CORP.
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Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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