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Throttle Position Sensor (TPS) Not Within Limits

  1. Verify that ignition switch is in "OFF" position. Set test selector switch to position "12" and DVOM switch to "TESTER". Disconnect TPS and attach Yellow Test Fixture (203814) to harness. If reading is between 100 and 250 ohms, go to step  3).
  2. If not, check Orange/White wire from throttle position sensor to ECA for a short or open. Also check Black/White wire for a short or open. See Figure. Repair wire(s) and retest.
  3. Set test selector switch to position "14". If reading is between 100-250 ohms, go to next step. If not, check Dark Green/Light Green wire from TPS to ECA for a short or open. Also check Black/White wire for a short or open. Repair wire(s) and retest.
  4. Connect DVOM between Orange/White wire and Black/White wire of TPS connector. Set DVOM to "200x1000 OHMS" range. If reading is between 3000-5000 ohms, go to next step. If reading is incorrect, replace TPS and retest.
  5. Connect DVOM between Dark Green/Light Green wire and Black/White wire of connector. See Figure. Set DVOM switch to "2000 OHMS" range. Verify throttle is in closed position (off high cam).
  6. If reading is less than 580 ohms and greater than 1100 ohms, adjust TPS until reading is correct and retest. If unable to bring TPS into range, replace TPS and retest.
  7. If reading is between 580-1100 ohms, reconnect TPS to harness. Set test selector switch to position "3". Turn ignition key to "RUN" and DVOM to "TESTER".
  8. Adjust TPS until voltmeter reading is 1.82-1.93 volts and retest. If TPS cannot be adjusted to obtain proper voltage, replace ECA and retest. Turn DVOM off and disconnect test equipment. Remove Yellow test fixture.
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