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Test NF-4A - Checking Coolant Sensor & TPS Calibrations

  1. Start engine. Allow engine to reach normal operating temperature. Using DRB-II, read coolant temperature sensor value. If temperature is 180-220°F (82-104°C), turn engine off and go to next step. If temperature is not as specified, replace coolant temperature sensor. Perform VERIFICATION TEST VER-2  .
  2. Turn ignition on. Using DRB-II, read TPS voltage with throttle fully closed and against throttle stop. If reading is more than 1.5 volts with throttle closed, replace TPS. Perform VERIFICATION TEST VER-2  . If reading is 1.5 volts or less with throttle closed, monitor TPS voltage while slowly opening throttle to wide open position.
  3. If voltage change is not a smooth transition, replace TPS. Perform VERIFICATION TEST VER-2  . If voltage change is a smooth transition, check if maximum voltage is at least 3.4 volts with throttle wide open. If maximum voltage is not at least 3.4 volts, replace TPS. Perform VERIFICATION TEST VER-2  .
  4. If maximum voltage is at least 3.4 volts, start engine and let it idle. Using DRB-II, read minimum throttle voltage. If reading is not 0-1.5 volts, replace TPS. Perform VERIFICATION TEST VER-2  . If reading is 0-1.5 volts, test is complete.
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