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Home >> Chevrolet >> 2002 >> Tracker 4D Utility, 2.5 4, RWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Self-Diagnostics - 2.5L >> Diagnostic Tests >> DTC P1451: Barometric Pressure Sensor Performance >> Diagnostic Procedures
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Diagnostic Procedures

  1. Perform diagnostic system check - engine controls. See DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS  under SELF-DIAGNOSTIC SYSTEM. After performing diagnostic system check - engine controls, go to next step.
  2. Is there a Current or Pending DTC P0107 or DTC P0108 set? If yes, go to DTC P0107: MANIFOLD ABSOLUTE PRESSURE SENSOR CIRCUIT - LOW VOLTAGE  or DTC P0108: MANIFOLD ABSOLUTE PRESSURE SENSOR CIRCUIT - HIGH VOLTAGE  . If no, go to next step.
  3. Turn ignition on, with engine off. Clear the scan tool information. Select the MAP sensor parameter on the scan tool. Is the MAP sensor pressure reading about 97-100 kPa at sea level? If yes, go to next step. If no, go to step  7 .
  4. Turn ignition on, with engine off. Compare the pressure readings of the BARO sensor and the MAP sensor on the scan tool. Is the difference between the BARO pressure and the MAP pressure more than 3 kPa? If yes, go to step  8 . If no, go to next step.
  5. Turn ignition on, with engine off. Remove DOME fuse for 30 seconds. Install the DOME fuse. Reset the radio clock time. Start the engine. Operate the vehicle within the Freeze Frame conditions or until the DTC P1451 diagnostic test has run. Is DTC P1451 set? If yes, go to next step. If no, go to DIAGNOSTIC AIDS  .
  6. Select the Freeze Frame/Failure Record for the current DTC P1451 on the scan tool. Review the MAP sensor readings in the Freeze Frame/Failure Record. Were the recorded MAP sensor readings normal? If yes, go to step  8 . If no, go to next step.
  7. Inspect the MAP sensor for a skewed or incorrectly calibrated MAP sensor, blockage or restriction in the MAP sensor vacuum supply, or electrical resistance in the MAP sensor signal circuit. Repair as necessary. After repairs, go to step  9 .
  8. Turn ignition off. Replace PCM. Perform PCM relearn procedure. See POWERTRAIN CONTROL MODULE  under PROGRAMMING. After replacing PCM, go to next step.
  9. Turn OFF ignition. Remove DOME fuse for 30 seconds. Install the DOME fuse. Reset the radio clock time. Start the engine. Operate the vehicle within the Conditions for Running the DTC or until the DTC P01451 diagnostic test has run. See CONDITIONS FOR RUNNING DTC  . Does the DTC run and pass? If yes, go to next step. If no, go to step  2 .
  10. Using scan tool, observe stored information and Capture Info. Does the scan tool display any DTCs that you have not diagnosed? If yes, see DIAGNOSTIC TROUBLE CODE DEFINITIONS  . If no, system is okay.
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