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Code 5 - Map Sensor

  1. Turn ignition off and 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, 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 system checker harness between ECU and ECU connector. Measure voltage between terminals C11 (pos.) and C14 (neg.). If voltage reading is about 5 volts, go to next step. If voltage is not about 5 volts, check for open in White wire between MAP sensor and ECU. If wire is okay, replace MAP sensor.
  4. Substitute a known good ECU. If condition is rectified, replace original ECU.
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