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Home >> Mitsubishi >> 1990 >> Precis Base, Standard >> Repair and Diagnosis >> Engine Performance >> Engine Controls - Adjustments >> Throttle Position Sensor (TPS) >> Engine Controls - Adjustments >> Test No. 4
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Test No. 4

  1. Loosen throttle cable. Counting the number of turns while loosening, turn idle speed adjustment screw and SAS-2 until throttle valve is fully closed. See Figure . Record number of turns required to completely close throttle valve. Ensure fast idle lever does not rest on fast idle cam.
  2. With ignition off, disconnect carburetor wiring harness connector. Connect Test Harness (MD998474) between connectors. Connect digital voltmeter between Red and Blue wires of test harness.
  3. Turn ignition on. DO NOT start engine. TPS voltage should be .25 volt. If digital voltmeter does not read .25 volt, loosen TPS mounting screws and rotate TPS clockwise or counterclockwise until correct voltage is obtained. Tighten TPS mounting screws.
  4. Turn ignition off. Disconnect voltmeter and remove test harness. Reconnect carburetor wiring harness. Tighten idle speed adjustment screw and SAS-2 same number of turns as loosened. Adjust throttle cable free play. Start engine and check idle speed.
  5. Disconnect negative battery cable for at least 10 seconds to clear diagnostic trouble code. Reconnect negative battery cable. Operate engine at idle for approximately 5 minutes to ensure engine idles smoothly.
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