2010 Cadillac CTS Sedan AWD V6-3.6L Page 991
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 P0090
- Fuel Pressure Regulator Control Circuit
DTC P0091
- Fuel Pressure Regulator Control Circuit Low Voltage
DTC P0092
- Fuel Pressure Regulator Control Circuit High Voltage
Diagnostic Fault Information
Circuit/System Description
High pressure fuel is regulated by the high pressure fuel pump actuator, which is a part of the high pressure fuel pump. The high pressure fuel pump
actuator is a solenoid valve. The ECM provides battery voltage on the actuator high control circuit and ground on the actuator low control circuit.
Both circuits are controlled through output drivers within the ECM. When deactivated, both drivers are disabled. When activated, the high control
circuit driver energizes the high pressure fuel pump actuator and the low control circuit driver pulse-width modulates (PWM) the low control circuit
to ground.
Conditions for Running the DTC
* DTC P0641, P0642, or P0643 is not set.
* The ignition 1 signal parameter is between 10-18 V.
* DTCs P0090, P0091, and P0092 run continuously when the conditions above are met for greater than 2 s.
Conditions for Setting the DTC
P0090
* The high pressure fuel pump actuator voltage is between 2.7-4.5 V with the actuator commanded OFF.
* The above condition is present for greater than 5 s.
P0091
* The high pressure fuel pump actuator voltage is less than 2.7 V with the actuator commanded OFF.
* The above condition is present for greater than 5 s.
P0092
* The high pressure fuel pump actuator voltage is greater than 4.5 V with the actuator commanded ON.
* The above condition is present for greater than 5 s.
Action Taken When the DTC Sets
* DTCs P0090, P0091, and P0092 are Type A DTCs.
* A message center or an indicator displays Reduced Engine Power.
Conditions for Clearing the DTC
DTCs P0090, P0091, and P0092 are Type A DTCs.
Reference Information
Schematic Reference
Engine Controls Schematics (LLT) (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)
Description and Operation
Fuel System Description (See: Powertrain Management/Computers and Control Systems/Description and Operation/Fuel System Description)
