2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 2065
1. Seal the EVAP system and use the flow meter on the J 41413-200, calibrated to 0.51 mm (0.020 in) to determine that there is no leak in the
EVAP system.
2. Clear DTCs.
P0443
DTC P0443 or P0449
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 P0443
- Evaporative Emission (EVAP) Purge Solenoid Control Circuit
DTC P0449
- Evaporative Emission (EVAP) Vent Solenoid Control Circuit
Diagnostic Fault Information
Circuit/System Description
An ignition voltage is supplied directly to the evaporative emission (EVAP) canister purge solenoid valve. The engine control module (ECM)
grounds the EVAP canister purge solenoid valve control circuit through an internal switch called a driver. The ECM monitors the status of the
driver. The EVAP canister purge solenoid valve is pulse width modulated (PWM). A scan tool will display the amount of ON time as a percentage.
Battery voltage is supplied to the EVAP canister solenoid valve. The ECM grounds the EVAP canister vent solenoid valve control circuit through
an internal switch called a driver. The ECM monitors the status of the driver. A scan tool will display the commanded state of the EVAP canister
vent solenoid valve as ON or OFF.
Conditions for Running the DTC
* The ignition is ON.
* The system voltage is between 9-18 volts.
* DTCs P0443 and P0449 run continuously when the above conditions are met.
Conditions for Setting the DTC
The ECM detects that the commanded state of the driver and the actual state of the control circuit do not match for a minimum of 5 seconds.
Action Taken When the DTC Sets
DTCs P0443 and P0449 are Type B DTCs.
Conditions for Clearing the MIL/DTC
DTCs P0443 and P0449 are Type B DTCs.
Reference Information
Schematic Reference
Engine Controls Schematics (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)
Description and Operation
