C2191

DTC C2191

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.



DTC Descriptor
DTC C2191
- Vehicle Speed Signal Performance




Circuit/System Description

The tire pressure control module receives a vehicle speed signal from the IPC.


Conditions for Running the DTC

The ignition is ON.


Conditions for Setting the DTC

Vehicle speed signal circuit malfunction.


Action Taken When the DTC Sets

The Tire Pressure Warning Light is illuminated.


Conditions for Clearing the DTC

Vehicle speed is greater than 12 mph for 3 seconds.


Reference Information
Description and Operation

Tire Pressure Monitor 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. Disconnect the harness connector at the Tire Pressure Control Module.
2. Disconnect the harness connector at the IPC.
3. Test for less than 1 ohm of resistance between the vehicle speed signal circuit terminal 2 and terminal 17.

• If greater than the specified value, test the vehicle speed signal circuit for an open/high resistance.

4. Test for infinite resistance between the vehicle speed signal circuit terminal 2 and ground.

• If not the specified value, test vehicle speed signal circuit for a short to ground, if circuit tests normal replace the tire pressure control module.




Repair Instructions

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

* Tire Pressure Sensor Learn (Programming and Relearning)
* Control Module References (Programming and Relearning) for replacement, setup, and programming