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Home >> Plymouth >> 1990 >> Colt GL, Automatic >> Repair and Diagnosis >> Engine Performance >> Engine Controls - Adjustments >> Throttle Position Sensor (TPS) >> Engine Controls - Adjustments >> Test No. 3

Test No. 3

  1. Turn ignition on for more than 15 seconds. DO NOT  start engine. Turn ignition off. This should fully retract ISC plunger.
  2. Ensure ISC plunger is fully retracted. Disconnect TPS harness connectors. Connect Test Harness (MD998474) between connectors. Connect digital voltmeter between Red wire and Blue wire of test harness.
  3. Turn ignition on. DO NOT  start engine. TPS voltage should be .48-.52 volt. If TPS voltage is within specification, go to step 4). If TPS voltage is not within specification, 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 TPS harness connectors. Adjust throttle cable. Start engine and check idle speed.
  5. Turn ignition off. 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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