2010 Cadillac Truck SRX FWD V6-3.0L Page 918

2010 Cadillac Truck SRX FWD V6-3.0L Page 918

P00C6

The ECM detects that the fuel pressure is not rising or has fallen beyond acceptable limits during engine cranking.

P228C

The actual fuel rail pressure is 1.5 MPa (218 psi) less than the desired fuel pressure. The condition exists for greater than 5 s.

P228D

The actual fuel rail pressure is 3.6 MPa (522 psi) greater than the desired fuel rail pressure. The condition exists for greater than 5 s.

Action Taken When the DTC Sets

* DTCs P0089 and P00C6 are Type B DTCs.

* DTCs P228C and P228D are Type A DTCs.

* A message center or an indicator displays Reduced Engine Power.

Conditions for Clearing the DTC

* DTCs P0089 and P00C6 are Type B DTCs.

* DTCs P228C and P228D are Type A DTCs.

Diagnostic Aids

* A restricted fuel feed pipe between the fuel feed pipe fuel pressure sensor and the high pressure fuel pump may set a DTC.

* A condition with the fuel tank fuel pump module or fuel pump flow control module may set a DTC.

* A skewed fuel rail pressure sensor, or an intermittent condition in the fuel rail pressure sensor circuits may set a DTC.

* A leaking or restricted fuel injector may set a DTC.

* A short to voltage in the crankshaft position signal circuit may set a DTC.

* A short to voltage in the camshaft position actuator solenoid valve control circuit may set a 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)

Scan Tool Reference

Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information

Circuit/System Verification

1. Observe the DTC information with a scan tool. DTC P0627, P0628, P0629, P069E, or U0109 should not set.

瀚慖f a DTC is set refer to Diagnostic Trouble Code (DTC) List - Vehicle (See: Diagnostic Trouble Code Descriptions/Diagnostic Trouble

2010 Cadillac Truck SRX FWD V6-3.0L Page 917

2010 Cadillac Truck SRX FWD V6-3.0L Page 917

DTC P0089, P00C6, P228C, or P228D (LF1, LFW)

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 P0089

- Fuel Pressure Regulator Performance

DTC P00C6

- Fuel Rail Pressure Low During Engine Cranking

DTC P228C

- Fuel Pressure Regulator 1 Control Performance - Low Pressure

DTC P228D

- Fuel Pressure Regulator 1 Control Performance - High Pressure

Circuit/System Description

The fuel rail pressure sensor detects fuel pressure within the fuel rail. The engine control module (ECM) provides a 5 V reference voltage on the 5

V reference circuit and ground on the low reference circuit. The ECM receives a varying signal voltage on the signal circuit.

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 a 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 high pressure mechanical fuel pump is driven by three lobes on the camshaft. The ECM uses the camshaft and crankshaft position sensor inputs

to synchronize the high pressure fuel pump actuator with the position of each of the camshaft lobes. The ECM regulates fuel pressure by adjusting

the portion of each pump stroke that provides fuel to the rail.

The ECM monitors the fuel rail fuel pressure sensor and the high pressure fuel pump actuator to determine if the commanded and actual pressure

are within a predetermined range, or if the amount of fuel pressure correction exceeds a calibrated pressure.

Conditions for Running the DTC

P0089, P228C, or P228D

* DTC P0090, P0091, P0092, P0191, P0192, or P0193 is not set.

* The ignition voltage is less than 18 V.

* The deceleration fuel cut-off (DFCO) is inactive.

* The engine speed is greater than 25 RPM.

* The air bag is not deployed.

* The DTCs run continuously when the above conditions are met for 5 s.

P00C6

* DTC P0090, P0091, P0092, P00C8, P00C9, P00CA, P0116, P0117, P0118, P0128, P0192, P0193, P0335, P0336, P0340, P0341, P0345,

P0346, P0365, P0366, P0390, P0391, P0627, P0628, P0629 are not set.

* The ignition voltage is more than 8 V.

* The engine coolant temperature is between -100 and +65掳C (-148 and +149掳F).

* The low side fuel pressure is more than 0 kPa (0 psi).

* The engine is not running.

* The DTC runs once for each engine start.

Conditions for Setting the DTC

P0089

The high pressure fuel pump actuator command necessary to maintain the desired fuel rail pressure is +/-2.5 MPa (363 psi) of the command

expected by the controller. The condition exists for greater than 5 s.

2010 Cadillac Truck SRX AWD V6-3.0L Page 917

2010 Cadillac Truck SRX AWD V6-3.0L Page 917

DTC P0089, P00C6, P228C, or P228D (LF1, LFW)

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 P0089

- Fuel Pressure Regulator Performance

DTC P00C6

- Fuel Rail Pressure Low During Engine Cranking

DTC P228C

- Fuel Pressure Regulator 1 Control Performance - Low Pressure

DTC P228D

- Fuel Pressure Regulator 1 Control Performance - High Pressure

Circuit/System Description

The fuel rail pressure sensor detects fuel pressure within the fuel rail. The engine control module (ECM) provides a 5 V reference voltage on the 5

V reference circuit and ground on the low reference circuit. The ECM receives a varying signal voltage on the signal circuit.

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 a 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 high pressure mechanical fuel pump is driven by three lobes on the camshaft. The ECM uses the camshaft and crankshaft position sensor inputs

to synchronize the high pressure fuel pump actuator with the position of each of the camshaft lobes. The ECM regulates fuel pressure by adjusting

the portion of each pump stroke that provides fuel to the rail.

The ECM monitors the fuel rail fuel pressure sensor and the high pressure fuel pump actuator to determine if the commanded and actual pressure

are within a predetermined range, or if the amount of fuel pressure correction exceeds a calibrated pressure.

Conditions for Running the DTC

P0089, P228C, or P228D

* DTC P0090, P0091, P0092, P0191, P0192, or P0193 is not set.

* The ignition voltage is less than 18 V.

* The deceleration fuel cut-off (DFCO) is inactive.

* The engine speed is greater than 25 RPM.

* The air bag is not deployed.

* The DTCs run continuously when the above conditions are met for 5 s.

P00C6

* DTC P0090, P0091, P0092, P00C8, P00C9, P00CA, P0116, P0117, P0118, P0128, P0192, P0193, P0335, P0336, P0340, P0341, P0345,

P0346, P0365, P0366, P0390, P0391, P0627, P0628, P0629 are not set.

* The ignition voltage is more than 8 V.

* The engine coolant temperature is between -100 and +65掳C (-148 and +149掳F).

* The low side fuel pressure is more than 0 kPa (0 psi).

* The engine is not running.

* The DTC runs once for each engine start.

Conditions for Setting the DTC

P0089

The high pressure fuel pump actuator command necessary to maintain the desired fuel rail pressure is +/-2.5 MPa (363 psi) of the command

expected by the controller. The condition exists for greater than 5 s.

2010 Cadillac Truck SRX AWD V6-3.0L Page 918

2010 Cadillac Truck SRX AWD V6-3.0L Page 918

P00C6

The ECM detects that the fuel pressure is not rising or has fallen beyond acceptable limits during engine cranking.

P228C

The actual fuel rail pressure is 1.5 MPa (218 psi) less than the desired fuel pressure. The condition exists for greater than 5 s.

P228D

The actual fuel rail pressure is 3.6 MPa (522 psi) greater than the desired fuel rail pressure. The condition exists for greater than 5 s.

Action Taken When the DTC Sets

* DTCs P0089 and P00C6 are Type B DTCs.

* DTCs P228C and P228D are Type A DTCs.

* A message center or an indicator displays Reduced Engine Power.

Conditions for Clearing the DTC

* DTCs P0089 and P00C6 are Type B DTCs.

* DTCs P228C and P228D are Type A DTCs.

Diagnostic Aids

* A restricted fuel feed pipe between the fuel feed pipe fuel pressure sensor and the high pressure fuel pump may set a DTC.

* A condition with the fuel tank fuel pump module or fuel pump flow control module may set a DTC.

* A skewed fuel rail pressure sensor, or an intermittent condition in the fuel rail pressure sensor circuits may set a DTC.

* A leaking or restricted fuel injector may set a DTC.

* A short to voltage in the crankshaft position signal circuit may set a DTC.

* A short to voltage in the camshaft position actuator solenoid valve control circuit may set a 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)

Scan Tool Reference

Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information

Circuit/System Verification

1. Observe the DTC information with a scan tool. DTC P0627, P0628, P0629, P069E, or U0109 should not set.

瀚慖f a DTC is set refer to Diagnostic Trouble Code (DTC) List - Vehicle (See: Diagnostic Trouble Code Descriptions/Diagnostic Trouble