Thursday, February 13, 2020

2010 Cadillac CTS Sedan AWD V6-3.6L Page 1418

2010 Cadillac CTS Sedan AWD V6-3.6L Page 1418



* 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 P0450



- Fuel Tank Pressure (FTP) Sensor Circuit



DTC P0451



- Fuel Tank Pressure (FTP) Sensor Performance



Typical Scan Tool Data



Circuit/System Description



The control module monitors the fuel tank pressure (FTP) sensor signal in order to detect vacuum decay and excess vacuum during the evaporative



emission (EVAP) diagnostic test. The control module supplies a 5-volt reference and a low reference circuit to the FTP sensor. This DTC sets if the



engine control module (ECM) detects one of the following conditions:



* The FTP sensor signal voltage is not within a calibrated range on a cold start-up.



* The FTP sensor signal oscillates greater than a calibrated amount when vehicle speed is within a predetermined range.



The following table illustrates the relationship between FTP sensor signal voltage and the EVAP system pressure/vacuum.



Conditions for Running the DTC



P0450



* DTC P0100, P0101, P0102, P0103, P0116, P0117, P0118, P0119, P0443, P0449, P0458, P0459, P0498, P0499, P050A, P0506, P0507,



P0700, P2227, P2228, or P2229 is not set.



* The engine is operating.



* The ambient air temperature is greater than -7掳C (+19掳F).



* The vehicle speed is less than 31 km/h (19 mph).



* The ECM has commanded the EVAP canister vent valve open for greater than 3 seconds, 4 seconds for LLT.



* DTC P0450 runs continuously once the above conditions are met for approximately 25 seconds.



P0451 Condition 1



* DTC P0100, P0101, P0102, P0103, P0116, P0117, P0118, P0119, P0443, P0449, P0458, P0459, P0498, P0499, P050A, P0506, P0507,



P0700, P2227, P2228, or P2229 is not set.



* The engine is operating for greater than 1 second.



* The engine is idling.



* The ambient air temperature is greater than -7掳C (+19掳F).



* The vehicle speed is less than 10 km/h (6 mph) for greater than 29 seconds.



* The BARO is greater than 68 kPa.



* The fuel level is between 11-88 percent.



* The ECM has commanded the EVAP canister purge solenoid ON.



* The ECM has commanded the EVAP canister vent valve closed for greater than 4 seconds.



* DTC P0451 runs continuously when the above conditions are met for approximately 25 seconds.



P0451 Condition 2



* DTC P0100, P0101, P0102, P0103, P0116, P0117, P0118, P0119, P0443, P0449, P0458, P0459, P0498, P0499, P050A, P0506, P0507,

No comments:

Post a Comment