Good afternoon,
306 is for cylinder 6 misfire. You may have that one resolved with the vacuum line. It could take days to come back depending on the number of misfires detected.
As far as the 87, yes, it is fuel related. It could be either the high-pressure fuel pump or the rail pressure sensor.
I attached the description below for you.
Roy
DTC P0087, P0088, or P0089
Diagnostic Instructions
Perform the Diagnostic System Check - Vehicle (See: Vehicle > Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
Review Strategy Based Diagnosis (See: Vehicle > Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
Diagnostic Procedure Instructions (See: Vehicle > Initial Inspection and Diagnostic Overview) provides an overview of each diagnostic category.
DTC Descriptors
DTC P0087
Fuel Rail Pressure (FRP) Too Low
DTC P0088
Fuel Rail Pressure (FRP) Too High
DTC P0089
Fuel Pressure Regulator Performance
Circuit/System Description
The fuel rail pressure sensor detects fuel pressure within the fuel rail. The engine control module (ECM) provides a 5 volt reference voltage on the 5 volt reference circuit and ground on the low reference circuit. The ECM receives a varying signal voltage on the signal circuit.
High fuel pressure is regulated by the fuel rail pressure (FRP) regulator, which is a part of the high pressure fuel pump. The FRP regulator is a solenoid valve. The ECM provides battery voltage on the FRP regulator high circuit and ground on the FRP regulator low circuit. Both circuits are controlled through output drivers within the ECM. When deactivated, both drivers are disabled. When activated, the ECMs high circuit driver energizes the FRP regulator and the low circuit driver pulse-width modulates (PWM) the low 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 FRP regulator with the position of each of these 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 pressure sensor and the FRP regulator 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
DTC P0090, P0091, P0092, P0191, P0192, or P0193 is not set.
The ignition voltage is less than 18 volts.
The deceleration fuel cut-off (DFCO) is inactive.
The engine speed is greater than 25 RPM.
The engine start temperature is greater than -48°C (-54.4°F)
The air bag is not deployed.
DTCs P0087, P0088, and P0089 run continuously when the above conditions are met for 5 seconds.
Conditions for Setting the DTC
P0087
The actual fuel rail pressure is 1,500 kPa (218 psi) less than the desired fuel pressure.
P0088
The actual fuel rail pressure is 3,600 kPa (522 psi) greater than the desired fuel rail pressure.
P0089
The fuel rail pressure regulator command necessary to maintain the desired fuel rail pressure is +/-2,500 kPa (363 psi) of the command expected by the controller.
DTCs P0087, P0088, and P0089 set when the above conditions are met for 1 seconds or for a cumulative of 10 seconds.
Action Taken When the DTC Sets
DTCs P0087, P0088, and P0089 are Type A DTCs.
A message center or an indicator displays Reduced Engine Power.
Conditions for Clearing the DTC
DTCs P0087, P0088, and P0089 are Type A DTCs.
Diagnostic Aids
A skewed fuel rail pressure (FRP) sensor, or an intermittent condition in the FRP sensor circuits will set these DTCs.
Faulty fuel injectors may set DTC P0089.
Reference Information
Schematic Reference
Engine Controls Schematics (See: Powertrain Management > Electrical)
Connector End View Reference
Component Connector End Views (See: Vehicle > Connector Views)
Description and Operation
Fuel System Description (w/o LLT) (See: Computers and Control Systems > Components > Fuel System Description (LY7) VIN 7 W/O Direct Fuel Injection)Fuel System Description (w/LLT) (See: Computers and Control Systems > Components > Fuel System Description (LLT) VIN V W/ Direct Fuel Injection)
Electrical Information Reference
Circuit Testing (See: Vehicle > Component Tests and General Diagnostics)
Connector Repairs (See: Vehicle > Component Tests and General Diagnostics)
Testing for Intermittent Conditions and Poor Connections (See: Vehicle > Component Tests and General Diagnostics)
Wiring Repairs (See: Vehicle > Component Tests and General Diagnostics)
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions (See: A L L Diagnostic Trouble Codes ( DTC ) > Diagnostic Trouble Code Descriptions)
Scan Tool Reference
Control Module References (See: Vehicle > Programming and Relearning) for scan tool information
Circuit/System Verification
1. Observe the DTC information with a scan tool. DTC P029D, P02A1, P02A5, P02A9, P02AD, P02B1, P0627, P0628, or P0629 should not be set.
If a DTC is set refer to Diagnostic Trouble Code (DTC) List - Vehicle (See: A L L Diagnostic Trouble Codes ( DTC ) > Diagnostic Trouble Code Descriptions).
2. Attempt to start and idle the engine.
3. Observe the DTC information with a scan tool. DTCs P0087, P0088, and P0089 should not set.
4. Command an increase and decrease in fuel pressure with a scan tool. Observe the scan tool Desired Fuel Rail Pressure and the Actual Fuel Rail Pressure parameters. The Desired Fuel Rail Pressure and the Actual Fuel Rail Pressure should closely match in all the commanded states.
5. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
Circuit/System Testing
Important: Circuit/System Verification must be performed first or misdiagnosis may result.
1. Test the fuel system for 345-414 kPa (50-60 psi). Refer to Fuel Pressure Gage Installation and Removal (LP1, LY7) (See: Fuel Pressure > Component Tests and General Diagnostics > Fuel Pressure Gage Installation and Removal (LY7) VIN 7 W/O Direct Fuel Injection).
If the fuel pressure is not within the specified range, refer to Fuel System Diagnosis (See: Computers and Control Systems > Component Tests and General Diagnostics).
2. Remove the high pressure pump assembly and visually inspect the lobes on the camshaft for unusual wear.
If the lobes appear normal, replace the mechanical fuel pump assembly.
If the lobes are worn, replace the camshaft.
Repair Instructions
Perform the Diagnostic Repair Verification (See: A L L Diagnostic Trouble Codes ( DTC ) > Verification Tests) after completing the diagnostic procedure.
Camshaft Removal - Left Side (LY7/LP1) (See: Engine > Overhaul)Camshaft Removal - Left Side (LLT) (See: Engine > Overhaul)
Fuel Pump Replacement (LLT) (See: Fuel Pump > Removal and Replacement)
87
Removal Procedure
1. Relieve the low and high side fuel system pressure. Refer to Fuel Pressure Relief (With CH 48027 - LP1, LY7) (See: Fuel Pressure Release > Procedures > Fuel Pressure Relief (With CH 48027) (LY7) VIN 7 W/O Direct Fuel Injection)Fuel Pressure Relief (Without CH 48027 - LP1, LY7) (See: Fuel Pressure Release > Procedures > Fuel Pressure Relief (Without CH 48027) VIN 7 W/O Direct Fuel Injection)Fuel Pressure Relief (With High Pressure Pump - LLT) (See: Fuel Pressure Release > Procedures > Fuel Pressure Relief (With High Pressure Pump (LLT) VIN V W/ Direct Fuel Injection).
2. Remove the cross vehicle brace. Refer to Cross Vehicle Brace Replacement (See: Cross-Member > Removal and Replacement > Cross Vehicle Brace Replacement).
3. Remove the high pressure fuel pump shield. Refer to Fuel Pipe Shield Replacement (LLT) (See: Fuel Supply Line > Removal and Replacement).
4. Remove the intake manifold. Refer to Intake Manifold Replacement (See: Intake Manifold Removal and Replacement).
5. Remove the wiper module. Refer to Windshield Wiper Motor Replacement (See: Wiper Motor > Removal and Replacement > Windshield Wiper Motor Replacement)
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6. Disconnect the engine wiring harness electrical connector from the high pressure fuel pump.
7. Remove the radiator surge tank outlet pipe. Refer to Radiator Surge Tank Outlet Hose/Pipe Replacement (LLT) (See: Coolant Reservoir > Removal and Replacement)Radiator Surge Tank Outlet Hose/Pipe Replacement (LY7/LLT) (See: Coolant Reservoir > Removal and Replacement)
8. Remove the low pressure feed pipe. Refer to Fuel Feed Pipe Replacement (LLT) (See: Fuel Supply Line > Removal and Replacement).
9. Remove the high pressure pipe. Refer to Fuel Feed Intermediate Pipe Replacement (LLT) (See: Fuel Supply Line > Removal and Replacement). Discard this pipe.
10. Remove and discard the high pressure fuel pump bolts (4).
11. Remove the high pressure fuel pump (3).
12. Remove and discard the high pressure fuel pump gasket (2).
13. Remove and discard the high pressure fuel pump O-ring.
14. Remove the high pressure fuel pump roller lifter.
87
DTC P0087, P0088, or P0089
Diagnostic Instructions
Perform the Diagnostic System Check - Vehicle (See: Vehicle > Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
Review Strategy Based Diagnosis (See: Vehicle > Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
Diagnostic Procedure Instructions (See: Vehicle > Initial Inspection and Diagnostic Overview) provides an overview of each diagnostic category.
DTC Descriptors
DTC P0087
Fuel Rail Pressure (FRP) Too Low
DTC P0088
Fuel Rail Pressure (FRP) Too High
DTC P0089
Fuel Pressure Regulator Performance
Circuit/System Description
The fuel rail pressure sensor detects fuel pressure within the fuel rail. The engine control module (ECM) provides a 5 volt reference voltage on the 5 volt reference circuit and ground on the low reference circuit. The ECM receives a varying signal voltage on the signal circuit.
High fuel pressure is regulated by the fuel rail pressure (FRP) regulator, which is a part of the high pressure fuel pump. The FRP regulator is a solenoid valve. The ECM provides battery voltage on the FRP regulator high circuit and ground on the FRP regulator low circuit. Both circuits are controlled through output drivers within the ECM. When deactivated, both drivers are disabled. When activated, the ECMs high circuit driver energizes the FRP regulator and the low circuit driver pulse-width modulates (PWM) the low 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 FRP regulator with the position of each of these 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 pressure sensor and the FRP regulator 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
DTC P0090, P0091, P0092, P0191, P0192, or P0193 is not set.
The ignition voltage is less than 18 volts.
The deceleration fuel cut-off (DFCO) is inactive.
The engine speed is greater than 25 RPM.
The engine start temperature is greater than -48°C (-54.4°F)
The air bag is not deployed.
DTCs P0087, P0088, and P0089 run continuously when the above conditions are met for 5 seconds.
Conditions for Setting the DTC
P0087
The actual fuel rail pressure is 1,500 kPa (218 psi) less than the desired fuel pressure.
P0088
The actual fuel rail pressure is 3,600 kPa (522 psi) greater than the desired fuel rail pressure.
P0089
The fuel rail pressure regulator command necessary to maintain the desired fuel rail pressure is +/-2,500 kPa (363 psi) of the command expected by the controller.
DTCs P0087, P0088, and P0089 set when the above conditions are met for 1 seconds or for a cumulative of 10 seconds.
Action Taken When the DTC Sets
DTCs P0087, P0088, and P0089 are Type A DTCs.
A message center or an indicator displays Reduced Engine Power.
Conditions for Clearing the DTC
DTCs P0087, P0088, and P0089 are Type A DTCs.
Diagnostic Aids
A skewed fuel rail pressure (FRP) sensor, or an intermittent condition in the FRP sensor circuits will set these DTCs.
Faulty fuel injectors may set DTC P0089.
Reference Information
Schematic Reference
Engine Controls Schematics (See: Powertrain Management > Electrical)
Connector End View Reference
Component Connector End Views (See: Vehicle > Connector Views)
Description and Operation
Fuel System Description (w/o LLT) (See: Computers and Control Systems > Components > Fuel System Description (LY7) VIN 7 W/O Direct Fuel Injection)Fuel System Description (w/LLT) (See: Computers and Control Systems > Components > Fuel System Description (LLT) VIN V W/ Direct Fuel Injection)
Electrical Information Reference
Circuit Testing (See: Vehicle > Component Tests and General Diagnostics)
Connector Repairs (See: Vehicle > Component Tests and General Diagnostics)
Testing for Intermittent Conditions and Poor Connections (See: Vehicle > Component Tests and General Diagnostics)
Wiring Repairs (See: Vehicle > Component Tests and General Diagnostics)
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions (See: A L L Diagnostic Trouble Codes ( DTC ) > Diagnostic Trouble Code Descriptions)
Scan Tool Reference
Control Module References (See: Vehicle > Programming and Relearning) for scan tool information
Circuit/System Verification
1. Observe the DTC information with a scan tool. DTC P029D, P02A1, P02A5, P02A9, P02AD, P02B1, P0627, P0628, or P0629 should not be set.
If a DTC is set refer to Diagnostic Trouble Code (DTC) List - Vehicle (See: A L L Diagnostic Trouble Codes ( DTC ) > Diagnostic Trouble Code Descriptions).
2. Attempt to start and idle the engine.
3. Observe the DTC information with a scan tool. DTCs P0087, P0088, and P0089 should not set.
4. Command an increase and decrease in fuel pressure with a scan tool. Observe the scan tool Desired Fuel Rail Pressure and the Actual Fuel Rail Pressure parameters. The Desired Fuel Rail Pressure and the Actual Fuel Rail Pressure should closely match in all the commanded states.
5. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
Circuit/System Testing
Important: Circuit/System Verification must be performed first or misdiagnosis may result.
1. Test the fuel system for 345-414 kPa (50-60 psi). Refer to Fuel Pressure Gage Installation and Removal (LP1, LY7) (See: Fuel Pressure > Component Tests and General Diagnostics > Fuel Pressure Gage Installation and Removal (LY7) VIN 7 W/O Direct Fuel Injection).
If the fuel pressure is not within the specified range, refer to Fuel System Diagnosis (See: Computers and Control Systems > Component Tests and General Diagnostics).
2. Remove the high pressure pump assembly and visually inspect the lobes on the camshaft for unusual wear.
If the lobes appear normal, replace the mechanical fuel pump assembly.
If the lobes are worn, replace the camshaft.
Repair Instructions
Perform the Diagnostic Repair Verification (See: A L L Diagnostic Trouble Codes ( DTC ) > Verification Tests) after completing the diagnostic procedure.
Camshaft Removal - Left Side (LY7/LP1) (See: Engine > Overhaul)Camshaft Removal - Left Side (LLT) (See: Engine > Overhaul)
Fuel Pump Replacement (LLT) (See: Fuel Pump > Removal and Replacement)
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Monday, November 25th, 2019 AT 11:34 AM
