2010 Cadillac Truck SRX FWD V6-3.0L Page 1494

2010 Cadillac Truck SRX FWD V6-3.0L Page 1494

4. Use the flow meter on the J 41413-200 - EEST , calibrated to 0.51 mm (0.020 in) to determine that there is no leak in the evaporative

emission system.

瀚慖f a leak is detected, use the J 41413-200 - EEST to apply smoke to the evaporative emission system at the purge tube until the leak is

located using the J 41413-SPT - White Light.

Repair Verification

1. Seal the evaporative emission system and use the flow meter on the J 41413-200 - EEST , calibrated to 0.51 mm (0.020 in) to determine that

there is no leak in the evaporative emission system.

2. Clear DTCs.

P0443

DTC P0443 or P0449 (LF1)

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 Valve Control Circuit

DTC P0449

- Evaporative Emission (EVAP) Vent Solenoid Valve 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 evaporative emission canister purge solenoid valve control circuit through an internal switch called a driver. The ECM monitors the

status of the driver. The evaporative emission 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 vent 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

evaporative emission canister vent solenoid valve as ON or OFF.

Conditions for Running the DTC

* The ignition is ON.

* The system voltage is between 9-18 V.

* 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