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Code 5 - Map Sensor

  1. Turn ignition off. Remove hazard fuse in main fuse box for 10 seconds to reset ECU. Start engine and observe "CHECK ENGINE" light. If light is off, problem is intermittent. Test drive and check again.
  2. If light is on, turn ignition off. Connect vacuum pump/gauge to MAP sensor 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, repair hose or clear restriction from throttle body. If vacuum supply is okay, turn ignition off. Connect ECU test harness between ECU and ECU connector. See Figure . Measure voltage between terminals C11 (pos.) and C14 (neg.). 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.
  4. Substitute a known good ECU and recheck. If condition is rectified, replace original ECU.
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