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Component Testing: Notes

IMPORTANT: You must perform the Circuit/System Testing in order to verify the integrity of the MAP sensor circuits before proceeding with the Component Testing.
  1. Turn ON the ignition, with the engine OFF, and remove the MAP sensor.
  2. Ignition ON, observe and record the scan tool MAP sensor pressure parameter. This is the first MAP sensor reading.
  3. With the J 23738-A  or J 35555  apply 5 in Hg (17 kPa) of vacuum to the MAP sensor. Observe and record the scan tool MAP sensor pressure 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 the vacuum decrease is not within the specified range, replace the MAP sensor.
  5. With the J 23738-A  or J 35555  apply 10 in Hg (34 kPa) of vacuum to the MAP sensor. Observe and record the scan tool MAP sensor pressure parameter. This is the third MAP sensor reading.
  6. Substract 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 the vacuum decrease is not within the specified range, replace the MAP sensor.
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