2010 Cadillac Truck SRX FWD V6-3.0L Page 1252

2010 Cadillac Truck SRX FWD V6-3.0L Page 1252

* DTC P0191 runs once an ignition cycle at engine start up when the condition has been met.

Condition 2 and 3

* The engine speed is greater than 25 RPM for greater than 30 s.

* The engine coolant temperature (ECT) at the previous engine shut down was warmer than 72掳C (162掳F).

* The ECT at engine start is colder than 55掳C (131掳F).

* At engine start, if the ECT is warmer than the intake air temperature (IAT), then the IAT must be within 35掳C (95掳F) of the ECT.

* At engine start, if the IAT is warmer than the ECT, then the ECT must be within 10掳C (50掳F) of the IAT.

* The block heater, if equipped, is not active.

* The engine off time since the previous engine shut down is greater than 4.2 h.

* DTC P0191 runs once an ignition cycle at engine start up when the above conditions have been met.

Conditions for Setting the DTC

Condition 1

DTC P0087, P2187, or P2188 is set, and the fuel pressure at ignition ON is less than 120 kPa (17.4 psi) for greater than 4 s or for a cumulative of

30 s.

Condition 2

DTC P0088, P2177, or P2187 is set, and the fuel pressure at ignition ON is greater than 1.5 MPa (218 psi) for greater than 4 s or for a cumulative

of 30 s.

Condition 3

The fuel pressure at ignition ON is greater than 1.5 MPa (218 psi) and a fuel pressure increase of greater than 385 kPa (56 psi) occurs during the

fuel pump prime. The condition exists for greater than 4 s or for a cumulative of 30 s.

Action Taken When the DTC Sets

* DTC P0191 is a Type A DTC.

* A message center or an indicator may display Reduced Engine Power.

Conditions for Clearing the DTC

DTC P0191 is a Type A DTC.

Diagnostic Aids

A condition with the fuel tank fuel pump module or the fuel pump control module may set this DTC.

Reference Information

Schematic Reference

Engine Controls Schematics (LAU) (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)Engine Controls Schematics

(LF1) (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)

Connector End View Reference

Component Connector End Views (See: Diagrams/Connector Views/Connector End Views By Name)

Description and Operation

Fuel System Description (LF1) (See: Powertrain Management/Fuel Delivery and Air Induction/Description and Operation/Fuel System

Description)Fuel System Description (LAU or LY7) (See: Powertrain Management/Fuel Delivery and Air Induction/Description and

Operation/Fuel System Description)

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit

Testing/Circuit Testing)

* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic

Procedures/Connector Repairs/Connector Repairs)

* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General

Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)

* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring

Repairs/Wiring Repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (See: Diagnostic Trouble Code Descriptions/Powertrain Diagnostic Trouble Code

(DTC) Type Definitions)