2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 2065

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