Exhaust Vibration/Noise - Exhaust Flow Control System Malfunction

Exhaust Vibration/Noise - Exhaust Flow Control System Malfunction

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview)provides an overview of each diagnostic category.



Diagnostic Fault Information






Circuit/System Description

Exhaust tail pipe flow valve control module receives throttle position sensor and RPM information via serial data from powertrain control module (PCM). The exhaust tail pipe flow valve control module uses this information to determine if to command exhaust tail pipe flow control valve solenoid ON or OFF. When commanded OFF the exhaust tail pipe flow control valve solenoid allows vacuum to flow to close exhaust valve.


Reference Information
Schematic Reference

Exhaust System Schematics ([1][2]Electrical Diagrams)
Connector End View Reference

Component Connector End Views (Connector Views)
Description and Operation

Exhaust Tail Pipe Flow Control System Description and Operation (Description and Operation)
Electrical Information Reference

* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)

Scan Tool Reference

Control Module References (Programming and Relearning)for scan tool information


Circuit/System Testing

1. Ignition OFF, disconnect the exhaust tail pipe flow control valve solenoid connector.
2. Ignition ON, use scan tool to command exhaust flow control relay ON, measure for greater than 10 volts between the supply voltage circuit terminal 2 and ground.

• If less than the specified range, test the supply voltage circuit terminal 2 for a short to ground or an open/high resistance. If circuit tests normal, replace the exhaust tail pipe flow valve control module.

3. Verify that a test lamp illuminates between the supply voltage circuit terminal 2 and the ground circuit terminal 1.

• If the test lamp does not illuminate, test the ground circuit terminal 2 for an open/high resistance.

4. If all circuits test normal replace the exhaust tail pipe flow control valve solenoid.



Repair Instructions

Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.

* Exhaust Tail Pipe Flow Control Valve Solenoid Replacement (Service and Repair)
* Control Module References (Programming and Relearning)for exhaust tail pipe flow valve control module replacement, setup, and programming