2010 Cadillac CTS Sedan AWD V6-3.6L Page 792

2010 Cadillac CTS Sedan AWD V6-3.6L Page 792

* 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

DTC P00C8

- Fuel Pressure Regulator High Control Circuit

DTC P00C9

- Fuel Pressure Regulator High Control Circuit Low Voltage

DTC P00CA

- Fuel Pressure Regulator High 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. The ECM monitors the voltage on the circuits to detect a failure.

Conditions for Running the DTC

* The ignition voltage is between 11-18 V.

* The DTCs run continuously within the enabling conditions.

Conditions for Setting the DTC

P0090

* The ECM detects an open circuit in the high pressure fuel pump actuator low control circuit.

* The DTC sets when the above condition is present for 4 s.

P0091

* The ECM detects a short to ground in the high pressure fuel pump actuator low control circuit.

* The DTC sets when the above condition is present for 4 s.

P0092

* The ECM detects a short to voltage in the high pressure fuel pump actuator low control circuit.

* The DTC sets when the above condition is present for 4 s.

P00C8

* The ECM detects an open circuit in the high pressure fuel pump actuator high control circuit.

* The DTC sets when the above condition is present for 4 s.

P00C9

* The ECM detects a short to ground in the high pressure fuel pump actuator high control circuit.

* The DTC sets when the above condition is present for 4 s.

P00CA

* The ECM detects a short to voltage in the high pressure fuel pump actuator high control circuit.

* The DTC sets when the above condition is present for 4 s.

Action Taken When the DTC Sets