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Home >> Chevrolet >> 1999 >> Forward Control P12 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Tests W/Codes - DTC P0100-P0134 >> DTC P0106 >> DTC P0106: Map System Performance (2.2L "J" Body) >> Diagnostic Procedures

Diagnostic Procedures

  1. Perform On-Board Diagnostic (OBD) system check. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS INTRODUCTION article. After performing OBD system check, go to next step.
  2. Turn ignition on, with engine off. Using scan tool, establish communication with AFECU. Record MAP value. If MAP value is 75 kPa at altitude or 95 kPa at sea level, go to next step. If MAP value is not as specified, go to step  7.
  3. Disconnect vacuum source from MAP sensor, leaving electrical harness connected. Connect a hand-held vacuum pump to MAP sensor. Slowly apply 20 inches Hg, one inch Hg at a time to MAP sensor while observing scan tool display. MAP sensor value should decrease steadily 3-4 kPa for each inch Hg. If MAP sensor value decrease was erratic, go to step  7. If MAP sensor value decrease was steady, go to next step.
  4. With 20 inches Hg applied to MAP sensor, observe MAP value on scan tool. If MAP value is less than 34 kPa, go to next step. If MAP value is 34 kPa or greater, go to step  7.
  5. Disconnect vacuum source from MAP sensor. If MAP value returns to value recorded in step 2)  , go to next step. If MAP value is not as specified, go to step  7.
  6. Fault is not present at this time. See DIAGNOSTIC AIDS . Also check for undiagnosed DTCs. If DTCs are present, go to applicable DTC test. If no DTCs are present, go to step  10.
  7. Inspect MAP sensor harness connections. If a problem is found, go to next step. If connections are okay, go to step  9.
  8. Repair connections as necessary. After repairs, go to step  10.
  9. Replace MAP sensor. After repairs, go to next step.
  10. Using scan tool, clear DTCs. Start engine and allow it to reach normal operating temperature. Select SPECIFIC DTC function, and then enter this DTC. Operate vehicle within conditions required to duplicate DTC. If scan tool indicates that this DTC test ran and passed, system is okay. If scan tool does not indicate that this DTC test ran and passed, go to step  2.
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