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Home >> Chevrolet >> 2008 >> Optra LS, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - 2.0L (Diesel) >> Diagnostic Information and Procedures >> DTC P0069 >> Component Testing

Component Testing

  1. Ignition OFF, perform one of the following applicable procedures.
    • Disconnect the vacuum supply hose from the turbocharger boost pressure sensor
    • Remove the turbocharger boost pressure sensor from the intake manifold
  2. Ignition ON, observe and record the scan tool MAP sensor pressure data parameter. This is the first MAP sensor reading.
  3. Engine running, with the J 23738-A  apply 5 in Hg (17 kPa) of vacuum to the turbocharger boost pressure sensor. Observe and record the scan tool MAP sensor pressure data parameter. This is the second MAP sensor reading.
  4. Subtract the second MAP sensor reading from the first MAP sensor reading. Verify that the vacuum decrease is within 1 in Hg (4 kPa) of the applied vacuum.
    • If not within the specified range, replace the MAP sensor.
  5. With the J 23738-A  apply 10 in Hg (34 kPa) of vacuum to the turbocharger boost pressure sensor. Observe and record the scan tool MAP sensor pressure data parameter. This is the third MAP sensor reading.
  6. Subtract the third MAP sensor reading from the first MAP sensor reading. Verify that the vacuum decrease is within 1 in Hg (4 kPa) of the applied vacuum.
    • If not with in the specified range, replace the turbocharger boost pressure sensor.
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