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Home >> Chevrolet >> 2007 >> Chevy Express G2500, Van Cargo, 6.6 6 >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 9 (Engine Control System & Fuel System - 4.3L - DTC P0016 To DTC P0158) >> DTC P0106 >> Circuit/System Testing

Circuit/System Testing

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  1. Turn ON the ignition, with the engine OFF.
  2. Disconnect the MAP sensor.
    3. IMPORTANT: Certain resistances will not be detectable if a test lamp is not connected to provide a circuit load.
  3. Connect a test lamp between the MAP sensor 5-volt reference circuit and a good ground.
  4. Measure for a proper range of 4.8-5.2 volts between the MAP sensor 5-volt reference circuit and a good ground.
    • If the voltage is less than the specified range, then test the circuit for an open or high resistance. If the circuit tests normal, replace the PCM.
    • If the voltage is more than the specified range, then test the circuit for a short to voltage. If the circuit tests normal, replace the PCM.
  5. With the MAP sensor still disconnected, use the scan tool to observe the MAP Sensor parameter for the proper value of less than 12 kPa.
    • If the MAP Sensor parameter is more than 12 kPa, then test the MAP sensor signal circuit for a short to voltage. If the circuit tests normal, replace the PCM.
  6. Connect a 3-amp fused jumper wire between the MAP sensor 5-volt reference circuit and the MAP sensor signal circuit.
  7. Use the scan tool to observe the MAP Sensor parameter for the proper value of more than 103 kPa.
    • If the MAP Sensor parameter is less than 103 kPa, then test the MAP sensor signal circuit for high resistance. If the circuit tests normal, replace the PCM.
  8. Turn OFF the ignition, and all electrical accessories. Allow sufficient time for the control module to power down before taking a resistance measurement.
  9. Measure for a proper value of less than 10 ohms of resistance between the low reference circuit of the MAP sensor and a good ground.
    • If the resistance is more than 10 ohms, then test the circuit for a high resistance. If the circuit tests normal, replace the PCM.
  10. If the MAP sensor circuits test normal, then replace the MAP sensor.
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