2010 Cadillac CTS Sedan AWD V6-3.6L Page 1422
2. Observe the FTP Sensor voltage parameter. The FTP sensor voltage should be between 0.20-4.85 V.
3. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the
conditions that you observed from the Freeze Frame/Failure Records data.
Circuit/System Testing
1. Ignition OFF, remove the fuse that supplies B+ to terminal 56-X2 of the ECM.
2. Disconnect the FTP Sensor harness connector.
3. Test for less than 5 ohm between the low reference circuit terminal A and ground.
瀚慖f greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit/connections test normal, replace
the ECM.
4. Install the fuse that supplies B+ to terminal 56-X2 of the ECM.
5. Ignition ON, test for 4.8-5.2 V between the 5-volt reference circuit terminal C and ground.
瀚慖f less than the specified range, test the 5-volt reference circuit for a short to ground or open/high resistance. If the circuit/connections test
normal, replace the ECM.
瀚慖f greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit/connections test normal, replace the
ECM.
6. Observe the scan tool FTP sensor parameter. Verify that the FTP Sensor parameter is less than 4.8 V
瀚慖f greater than the specified value, test the signal circuit for a short to voltage. If the circuit/connections test normal, replace the ECM.
7. Install a 3 A fused jumper wire between the signal circuit terminal B and the 5-volt reference circuit terminal C. Verify that the scan tool FTP
Sensor parameter is greater than 4.8 V.
瀚慖f less than the specified value, test the signal circuit for a short to ground or an open/high resistance. If the circuit/connections test
normal, replace the ECM.
8. If all circuits/connections test normal, test or replace the FTP sensor.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Fuel Tank Pressure Sensor Replacement (See: Powertrain Management/Computers and Control Systems/Fuel Tank Pressure Sensor/Service
and Repair)
* Control Module References (See: Testing and Inspection/Programming and Relearning) for ECM replacement, setup, and programming
P0453
DTC P0452 or P0453 (w/LLT)
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
DTC Descriptors
DTC P0452
- Fuel Tank Pressure (FTP) Sensor Circuit Low Voltage
DTC P0453
- Fuel Tank Pressure (FTP) Sensor Circuit High Voltage
Diagnostic Fault Information
