Wednesday, February 12, 2020

2010 Cadillac CTS Sedan AWD V6-3.6L Page 1427

2010 Cadillac CTS Sedan AWD V6-3.6L Page 1427



4. The FTP Sensor parameter should be 1.3-1.7 V.



Circuit/System Testing



1. Ignition OFF, disconnect the harness connector at the B150 FTP sensor.



2. Ignition OFF, test for less than 5 ohm between the low reference circuit terminal 2 and ground.



瀚慖f greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM.



3. Ignition ON, test for 4.8-5.2 V between the 5 V reference circuit terminal 3 and ground.



瀚慖f less 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 ECM.



瀚慖f greater than the specified range, test the 5 V reference circuit for a short to voltage. If the circuit tests normal, replace the K20 ECM.



4. Verify the scan tool FTP sensor parameter is less than 0.2 V.



瀚慖f greater than the specified range, test the signal circuit terminal 1 for a short to voltage. If the circuit tests normal, replace the ECM.



5. Install a 3 A fused jumper wire between the signal circuit terminal 1 and the 5 V reference circuit terminal 3. Verify the scan tool FTP sensor



parameter is greater than 4.7 V.



瀚慖f 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



ECM.



6. If all circuits test normal, test or replace the B150 FTP sensor.



Repair Instructions



* For DTC P0452 or P0453, always perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic



procedure



* For DTC P0451 or P0454, clear DTCs with a scan tool



* Control Module References (See: Testing and Inspection/Programming and Relearning)for ECM replacement, setup, and programming



P0455



DTC P0455 or P0497 (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 Descriptor



DTC P0455



- Evaporative Emission (EVAP) System Large Leak Detected



DTC P0497



- Evaporative Emission (EVAP) System No Flow During Purge



Circuit/System Description



The control module tests the evaporative emission (EVAP) system for a large leak, or a stuck closed EVAP canister purge valve. The control



module monitors the fuel tank pressure (FTP) sensor signal to determine the EVAP system vacuum level. When the conditions for running are met,



the control module commands the EVAP canister purge valve OPEN and the EVAP vent valve CLOSED. This allows engine vacuum to enter the



EVAP system. At a calibrated time, or vacuum level, the control module commands the EVAP canister purge valve closed, sealing the system, and



monitors the FTP sensor input in order to determine the EVAP system vacuum level. If the system is unable to achieve the calibrated vacuum level,



or the vacuum level increases too slowly, a DTC sets.

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