Monday, November 30, 2020

2010 Cadillac CTS Sedan AWD V6-3.6L Page 993

2010 Cadillac CTS Sedan AWD V6-3.6L Page 993



P0092



DTC P0090, P0091, or P0092 (w/LLT)



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 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.