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Code 5 - Map Sensor

  1. Turn ignition off. Remove hazard fuse at battery positive terminal for 10 seconds to reset ECU. Start engine and observe "CHECK ENGINE" light. If light is off, problem is intermittent. Check all electrical connections and vacuum hoses. Test drive and check again.
  2. If light is on and LED indicates Code 5, turn ignition off. Connect hand-held vacuum pump/gauge to MAP hose at throttle body. Apply vacuum. If vacuum holds, go to step 3). If vacuum does not hold, attach vacuum pump/gauge directly to MAP sensor. Apply vacuum. If vacuum does not hold, replace MAP sensor. If vacuum holds, check MAP sensor vacuum hose for cracks, splits or looseness. Repair as necessary.
  3. Check vacuum supply to MAP sensor with engine running. If vacuum is not present, remove restriction from throttle body. If vacuum supply is okay, turn ignition off. Connect ECU test harness between ECU and ECU connector. Measure voltage between ECU terminals C11 (pos.) and C14 (neg.). See Figure .
  4. If voltage reading is about 3 volts, go to next step. If voltage is not about 3 volts, check for open in White wire between MAP sensor and ECU. If wire is okay, replace MAP sensor.
  5. Start engine and allow to idle. Measure voltage between ECU terminals C11 (pos.) and C14 (neg.). If about one volt is present, substitute a known good ECU. If condition is rectified, replace original ECU. If voltage is not as specified, replace MAP sensor.
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