2010 Cadillac CTS Sedan AWD V6-3.6L Page 1426
The FTP sensor voltage is less than 0.1 V for more than 5 s.
P0453
The FTP sensor voltage is more than 4.9 V for more than 5 s.
P0454
If, during the engine-off natural vacuum small leak test, P0442, the ECM detects an abrupt FTP signal change, other than a refueling event, this
DTC will set. An abrupt change is defined as a change of 0.45 inch H2O in the span of 1 s.
Action Taken When the DTC Sets
* DTCs P0451 and P0454 are Type A DTCs.
* DTCs P0452 and P0453 are Type B DTCs.
Conditions for Clearing the MIL/DTC
* DTCs P0451 and P0454 are Type A DTCs.
* DTCs P0452 and P0453 are Type B DTCs.
Diagnostic Aids
P0451 and P0454
* A restriction in the EVAP canister or vent lines could prevent fuel vapor pressure from bleeding off fast enough. If the vent system cannot
bleed off pressure fast enough, the re-zero procedure may not complete successfully, which could cause this code to set.
* Ensure that the reference port on the FTP sensor is unobstructed.
* An FTP sensor that is skewed or does not have a linear transition from low to high may cause this code to set. Scan tool output controls,
snapshot, and plot functions can help detect erratic sensor response. To test the sensor signal under vacuum conditions, use the Quick
Snapshot and the Purge/Seal functions to capture data while commanding purge to 20 %, then plot the data to look for erratic sensor
operation. A similar test can be done for the pressure side of the sensor operation by applying pressure with the J 41413-200 - EEST while
taking a snapshot.
Reference Information
Schematic Reference
Engine Controls Schematics (LLT) (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)Engine Controls Schematics
(LF1) (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views)
Description and Operation
Evaporative Emission Control System Description (See: Powertrain Management/Computers and Control Systems/Description and
Operation/Evaporative Emission Control System Description)
Electrical Information Reference
* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Connector Repairs/Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit
Testing/Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Wiring Repairs/Wiring Repairs)
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions (See: Diagnostic Trouble Code Descriptions/Powertrain Diagnostic Trouble Code
(DTC) Type Definitions)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning)for scan tool information
Special Tools
J 41413-200 - Evaporative Emission System Tester (EEST)
Circuit/System Verification
1. Remove the fuel cap.
2. Ignition ON, engine OFF.
3. Observe the Fuel Tank Pressure Sensor parameter with a scan tool.
