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Home >> Chevrolet >> 2006 >> Cobalt LTZ >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 13 (Engine Controls - 2.0L - DTC P0351 To DTC P2138) >> Diagnostic Information & Procedures >> DTC P0451, P0452, P0453, or P0454 >> Circuit/System Verification

Circuit/System Verification

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

P0451 and P0454

  1. If DTCs P0452, P0453, or P0641 are set, repair those first.
  2. With a scan tool, command the EVAP canister vent solenoid valve closed.
  3. Command the purge solenoid to 30 percent.
  4. Observe the FTP sensor voltage parameter as the vacuum increased to the abort limit.
  5. The voltage should scale smoothly.

P0452 and P0453

  1. Remove the fuel cap.
  2. Turn ON the ignition, with the engine OFF.
  3. Observe the Fuel Tank Pressure Sensor parameter with a scan tool.
  4. The FTP Sensor parameter should be 1.5 volts
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