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HOMESERVICE MANUALSCHEVROLET2000CAVALIER BASE, 2D COUPE, AUTOMATIC, 4T40E/MN4REPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROLS SELF-DIAGNOSTICS - 2.2L & 2.4LDIAGNOSTIC TESTSDTC P0105: MAP/TP SENSOR PERFORMANCE/RANGEDIAGNOSTIC PROCEDURES
2000 Chevrolet Cavalier Base, 2D Coupe, Automatic, 4T40E/MN4

Diagnostic Procedures

2000 Chevrolet Cavalier Base, 2D Coupe, Automatic, 4T40E/MN4SECTION Diagnostic Procedures
  1. Perform On-Board Diagnostic (OBD) system check. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM. After performing OBD system check, go to next step.
  2. If any other MAP, TP, A/C or fuel tank pressure sensor DTCs are set, go to applicable DTC test. If specified DTCs are not set, go to next step.
  3. Inspect condition of MAP and TP sensors and harnesses. Repair as necessary. After repairs, go to step  28 . If no problems are found, go to next step.
  4. Using scan tool, monitor TP sensor voltage with throttle fully closed. If voltage is less than 0.9 volt, go to next step. If voltage is not as specified, go to step  6 .
  5. Using scan tool, select TP ANGLE parameter. Monitor scan tool display while slowly depressing accelerator pedal to the floor and releasing (repeat several times). If value displayed on scan tool smoothly increases to greater than 98 percent and decreases to less than one percent according to accelerator pedal movement, go to step  7 . If value on scan tool does not change as specified, go to step  19 .
  6. Check throttle body incorrect air rate adjustment, and binding or damaged linkage. Repair as necessary. After repairs, go to step  28 . If no problem is found, go to step  19 .
  7. Using scan tool, compare BARO reading with a known-good vehicle. BARO reading should be within 3 kPa of other vehicle. Ensure readings are within specification for the present altitude. If readings are as specified, go to next step. If readings are not as specified, go to step  11 .
  8. Using scan tool, monitor MAP sensor value while starting engine. If MAP sensor value changes, go to next step. If MAP sensor value does not change, go to step  10 .
  9. With engine running, snap throttle while monitoring MAP sensor display on scan tool. If MAP sensor value changes rapidly, go to step  28 . If MAP sensor value does not change rapidly, go to next step.
  10. Turn engine off. Turn ignition on. Remove MAP sensor or vacuum hose (if applicable) from manifold port. Check for leaks or restrictions. Repair as necessary. After repairs, go to step  28 . If no problem is found, go to next step.
  11. Turn ignition off. Disconnect MAP sensor harness connector. Turn ignition on. If MAP sensor value on scan tool is zero volts, go to next step. If MAP sensor value on scan tool is not zero volts, go to step  13 .
  12. Using a fused jumper wire, jumper 5-volt reference circuit to signal circuit at MAP sensor harness connector. If MAP sensor value on scan tool is 5.0 volts, go to step  14 . If MAP sensor value on scan tool is not 5.0 volts, go to step  15 .
  13. Turn ignition off. Disconnect PCM harness connectors. Turn ignition on, with engine off. Check MAP sensor signal circuit for a short to voltage. Repair as necessary. After repairs, go to step  28 . If circuit is okay, go to step  27 .
  14. Using a test light connected to battery positive, probe ground circuit at MAP sensor harness connector. If test light illuminates, go to step  16 . If test light does not illuminate, go to step  18 .
  15. Check MAP sensor 5-volt reference circuit for poor connection at PCM. Repair as necessary. After repairs, go to step  28 . If connection is okay, go to step  27 .
  16. Check for poor connections at MAP sensor. Repair as necessary. After repairs, go to step  28 . If connections are okay, go to next step.
  17. Replace MAP sensor. After repairs, go to step  28 .
  18. Check MAP sensor ground circuit for poor connections. Repair as necessary. After repairs, go to step  28 . If circuit is okay, go to step  27 .
  19. Turn ignition off. Disconnect TP sensor harness connector. Turn ignition on. If TP sensor value on scan tool is zero volts, go to next step. If TP sensor value on scan tool is not zero volts, go to step  21 .
  20. Using a fused jumper wire, jumper 5-volt reference circuit to signal circuit at TP sensor harness connector. If TP sensor value on scan tool is 5 volts, go to step  22 . If TP sensor value on scan tool is not 5 volts, go to step  23 .
  21. Turn ignition off. Disconnect PCM harness connectors. Turn ignition on, with engine off. Check TP sensor signal circuit for a short to voltage. Repair as necessary. After repairs, go to step  28 . If circuit is okay, go to step  27 .
  22. Using a test light connected to battery positive, probe ground circuit at TP sensor harness connector. If test light illuminates, go to step  24 . If test light does not illuminate, go to step  25 .
  23. Check TP sensor 5-volt reference or signal circuit for poor connections. Repair as necessary. After repairs, go to step  28 . If circuits are okay, go to step  27 .
  24. Check for poor connections at TP sensor. Repair as necessary. After repairs, go to step  28 . If connections are okay, go to next step.
  25. Replace TP sensor. After repairs, go to step  28 .
  26. Check TP sensor ground circuit for poor connection or high resistance at TP sensor harness connector. Repair as necessary. After repairs, go to step  28 . If circuit is okay, go to next step.
  27. Replace PCM. Program replacement PCM using necessary equipment. After repairs, go to next step.
  28. Using scan tool, clear DTCs. Start engine and allow it to reach normal operating temperature. Select DTC, SPECIFIC, and then enter DTC P0105. Operate vehicle within conditions for setting this DTC. If scan tool indicates that this test ran and passed, go to next step. If scan tool does not indicate that this test ran and passed, go to step  2 .
  29. Using scan tool, select CAPTURE INFO, REVIEW INFO function. If any undiagnosed DTCs are displayed, go to applicable DTC test. If no undiagnosed DTCs are displayed, system is okay.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.