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Home >> Saturn >> 2006 >> Relay 3.9 1, AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - 3.9L - DTC P0010 To DTC P0420 >> DTC P0106, P0107, or P0108 >> Circuit/System Testing
July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!

Circuit/System Testing

P0106

  1. Ignition OFF, disconnect the MAP sensor from the vacuum source, leave connected to engine harness.
  2. Connect a J 23738-A  to the MAP sensor.
  3. Turn ON the ignition, with the engine OFF.
  4. Observe the MAP sensor pressure with the scan tool.
  5. Apply vacuum with the J 23738-A  to the MAP sensor in 1 inch Hg increments until 15 inches Hg is reached. Each 1 inch Hg should decrease MAP sensor pressure by 3-4 kPa. Monitor the MAP sensor pressure to see if the decrease in pressure is consistent.
    • If decrease in pressure is not consistent, then test for intermittent and poor connections at the MAP sensor. If connections test OK, replace the MAP sensor.
  6. Apply vacuum with the J 23738-A  until 20 inches Hg is reached. Observe the MAP sensor pressure for less than 34 kPa.
  7. If more than 34 kPa, test for an intermittent and for a poor connection at the MAP sensor. If connections test OK, replace the MAP sensor.

P0107 or P0108

  1. Ignition OFF, disconnect the harness connector at the MAP sensor.
  2. Ignition OFF, test for less than 5 ohm of resistance between the low reference circuit terminal A and ground.
    • If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the control module.
  3. Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit terminal C and ground.
    • If less than the specified range, test the 5-volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the control module.
    • If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the control module.
  4. Verify the scan tool MAP parameter is less than 12 kPa.
    • If greater than the specified range, test the signal circuit terminal B for a short to voltage. If the circuit tests normal, replace the control module.
  5. Install a 3A fused jumper wire between the signal circuit terminal B and the 5-volt reference circuit terminal C. Verify the scan tool MAP parameter is greater than 103 kPa.
    • If less than the specified range, test the signal circuit for short to ground or an open/high resistance. If the circuit tests normal, replace the control module.
  6. If all circuits test normal, test or replace the MAP sensor.
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