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Home >> Chevrolet >> 2012 >> Cruze Eco, Automatic Trans >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 5 (Engine Controls/Fuel - 1.8L - DTC Diagnostics, Troubleshooting & Diagnosis) >> Diagnostic Information and Procedures >> DTC P0106 (LUW) >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.
NOTE:

You must perform the Circuit/System Verification before proceeding with Circuit/System Testing.

  1. Verify none of the following conditions exist:
    • Restricted exhaust, refer to Restricted Exhaust .
    • Engine mechanical condition for example, low compression or incorrect timing belt installation. Refer to Symptoms - Engine Mechanical .
    • Verify there are no vacuum leaks.
    • Verify the positive crankcase ventilation system if operation properly.
  2. Verify the integrity of the entire air induction system components by inspecting for the following conditions:
    • Any damaged components
    • An air flow restriction
    • Any vacuum leak
    • Improperly routed vacuum hoses
    • A restriction in the MAP sensor port
  3. Ignition OFF, disconnect the harness connector at the B74 Manifold Absolute Pressure Sensor.
  4. Ignition OFF for 60 s, test for less than 5 Ω between the low reference circuit terminal 2 and ground.
    • If greater than the specified range, test the 5 V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K20 Engine Control Module.
  5. Ignition ON, test for 4.8-5.2 V between the B74 Manifold Absolute Pressure Sensor 5 V reference circuit terminal 1 and ground.
    • If less than the specified range, test the 5 V reference circuit for a short to ground or open/high resistance. If the circuit tests normal, replace the K20 Engine Control Module.
    • If greater than the specified range, test the 5 V reference circuit for a short to voltage. If the circuit tests normal, replace the K20 Engine Control Module.
  6. Verify the scan tool MAP Sensor parameter is 1 kPa (0.14 PSI).
    • If greater than the specified value, test the signal circuit terminal 3 for a short to voltage. If the circuit tests normal, replace the K20 Engine Control Module.
  7. Install a 3 A fused jumper wire between the B74 Manifold Absolute Pressure Sensor signal circuit terminal 3 and the 5 V reference circuit terminal 1. Verify the scan tool MAP sensor parameter is greater than 121 kPa (18 755 PSI).
    • 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 K20 Engine Control Module.
  8. If all circuits test normal, test or replace the B74 Manifold Absolute Pressure Sensor.
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