1993 Acura Legend Base, AutomaticFACTORY OEM SERVICE PROCEDURE

Code 7: Throttle Position Sensor

  1. Turn ignition off. Remove ACG fuse (No. 15, 7.5-amp) from underdash fuse box for 10 seconds to reset ECM. Check ECM for fault codes. If Code 7 is not present, problem is intermittent. Check for poor and loose connections at throttle position sensor, right shock tower harness connector and ECM connectors. Test drive vehicle and retest.
  2. If Code 7 is present, turn ignition off. Disconnect 3-pin connector from throttle position sensor. Turn ignition on. Measure voltage between Yellow/White (+) and Green/White (-) wire terminals. If voltage is not about 5 volts, go to step 5. If about 5 volts are present, turn ignition off. Reconnect sensor connector. Connect ECM Test Harness (07LAJ-PT3010A ) between ECM and ECM connectors. See Figure .
  3. Turn ignition on. Measure voltage between test terminals D11 (+) and D22 (-). Voltage should be about 0.5 volt at closed throttle and about 4.5 volts at wide open throttle. Transition from 0.5 to 4.5 volts (as throttle is opened) should be smooth.
  4. If voltage is correct, replace ECM and retest. If voltages are not correct, replace throttle position sensor or repair open or short in Red/Blue wire between ECM terminal D11 and throttle position sensor.
  5. If voltage between Yellow/White (+) and Green/White (-) wire terminals in step 2 was not about 5 volts, measure voltage between Yellow/White (+) wire terminal and body ground. If voltage is about 5 volts, repair open in Green/White wire between ECM terminal D22 and throttle position sensor. If voltage is not about 5 volts, turn ignition off.
  6. Connect ECM Test Harness (07LAJ-PT3010A ) between ECM and ECM connectors. See Figure . Turn ignition on. Measure voltage between test terminals D20 (+) and D22 (-). If voltage is about 5 volts, repair open in Yellow/White wire terminal between ECM connector terminal D20 and throttle position sensor. If voltage is not about 5 volts, replace ECM and retest.
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When to See a Mechanic

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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