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Home >> Honda >> 1991 >> Accord SE >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes >> Diagnostic Codes >> Code 3 - Map Sensor

Code 3 - Map Sensor

  1. Turn ignition off. Remove appropriate fuse for 10 seconds to reset ECU. See CLEARING CODES  . Start engine, and warm to normal operating temperature (cooling fan comes on). Verify if CHECK ENGINE light is on is flashing Code 3. If Code 3 is present, go to next step. If Code 3 is not present, problem is intermittent. Check connectors at MAP sensor and at ECU.
  2. Turn ignition off. Disconnect 3-wire connector from MAP sensor. Turn ignition on. Measure voltage between Red/White (+) wire and ground. If reading is about 5 volts, go to step 3). If reading is not about 5 volts, go to step 7).
  3. Measure voltage between Red/White (+) and Blue/White (-) wires. If about 5 volts are present, go to step 4). If about 5 volts are not present, repair open in Blue/White wire between ECU terminal D21 and MAP sensor. If wire is okay, substitute a known good ECU. If condition is corrected, replace original ECU.
  4. Measure voltage between White/Blue (+) and Blue/White (-) wires. If voltage is about 5 volts, go to step 5). If about 5 volts are not present, repair open in White/Blue wire between ECU terminal D17 and MAP sensor. If wire is okay, substitute a known good ECU. If condition is corrected, replace original ECU.
  5. Turn ignition off. Reconnect 3-wire connector to MAP sensor. Connect ECU Test Harness (07LAJ-PT3010A ) between ECU and ECU harness. See Figure . Turn ignition on. Measure voltage between terminals D17 and D21. See Figure .
  6. If reading is not about 3 volts, replace MAP sensor. If about 3 volts are present, substitute a known good ECU, and recheck. If condition is corrected, replace original ECU.
  7. Connect ECU Test Harness to ECU only. Measure voltage between ECU terminals D19 and D21. If about 5 volts are present, repair open in Red/White wire between ECU terminal D19 and MAP sensor. If about 5 volts are not present, substitute a known good ECU, and retest. If condition is corrected, replace original ECU.
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