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Home >> Cadillac >> 1998 >> Seville SLS >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Tests W/Codes >> Diagnostic Trouble Codes >> DTC P0106 - Map System Performance >> Diagnostic Procedures
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Diagnostic Procedures

  1. Perform POWERTRAIN ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK , then go to next step.
  2. If DTC P0300 is also present, diagnose this DTC first. If DTC P0300 is not present, go to next step.
  3. Turn ignition on, with engine off. Using scan tool, select ENGINE 1 function and note MAP display value. If MAP value is greater than 75 kPa (95 kPa at sea level), go to next step. If MAP value is not greater than 75 kPa (95 kPa at sea level), go to step 7).
  4. Disconnect vacuum hose at MAP sensor. Connect a hand-held vacuum pump to MAP sensor. Slowly apply 20 in. Hg to sensor and note MAP display. Each one in. Hg applied to MAP sensor should result in a 4 kPa drop in MAP sensor reading. Watch for erratic reading. If reading is erratic, go to step 7). If reading changes smoothly, go to next step.
  5. If MAP sensor reading is 34 kPa or less with 20 in. Hg applied to sensor, go to next step. If MAP sensor reading is greater than 34 kPa with 20 in. Hg applied, go to step 7).
  6. Disconnect vacuum source from MAP sensor. If MAP sensor reading returns to original value, see DIAGNOSTIC AIDS. If MAP sensor reading does not return to original value, go to next step.
  7. Replace MAP sensor.
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