RM38N0EC _51 Engine / Hybrid System _111785 M20C-FKS, M20D-FKS ENGINE CONTROL _0504416 SFI SYSTEM C

M20C-FKS, M20D-FKS ENGINE CONTROL  SFI SYSTEM  P008A00  Low Pressure Fuel System Pressure - Too Low  


DESCRIPTION

In order to supply the optimal fuel pressure according to the driving conditions and usage environment, the variable fuel system sends a drive signal from the ECM to the fuel pump control ECU, steplessly performing variable control of the fuel pump (for low pressure side) and receiving feedback about the No. 2 fuel pressure (for low pressure side) from the fuel pressure sensor (for low pressure side).

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Note
P008A00 Low Pressure Fuel System Pressure - Too Low The actual fuel pressure (for low pressure side) value is less than the target fuel pressure (for low pressure side) by a certain amount or more (1 trip detection logic).
·

Leak of fuel

·

Fuel pump control ECU

·

No. 2 fuel pressure sensor (for low pressure side)

·

Fuel pump (for low pressure side)

·

Fuel main valve assembly

·

ECM


Does not come on SAE Code: P008A

MONITOR DESCRIPTION

If the fuel pressure (for low pressure side) decreases despite an increase request signal being sent to the fuel pump control ECU by the ECM, the ECM will store this DTC.

CONFIRMATION DRIVING PATTERN

A333609E31
4.781,0.917 5.031,0.5 5.031,0.5 5.198,0.5 false 5.26,0.417 6.688,0.76 1.427,0.344 10 false There is no designated vehicle speed 0.896,0.521 1.875,0.729 0.979,0.208 10 false Vehicle Speed 1.479,2.177 1.906,2.438 0.427,0.26 10 false Idling 0.698,2.458 2.094,2.677 1.396,0.219 10 false Ignition Switch ON 2.594,3.01 3.406,3.375 0.813,0.365 10 false Warming up 3.823,3.031 5.052,3.25 1.229,0.219 10 false 15 minutes or more 2.219,2.344 2.677,2.542 0.458,0.198 10 false [A] 2.927,2.063 3.385,2.26 0.458,0.198 10 false [B] 4.313,0.688 4.771,0.885 0.458,0.198 10 false [C] 5.323,3.427 5.781,3.625 0.458,0.198 10 false [D]

1.

Connect the GTS to the DLC3.

2.

Turn the ignition switch to ON.

3.

Turn the GTS on.

4.

Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).

5.

Turn the ignition switch off and wait for at least 30 seconds.

6.

Turn the ignition switch to ON [A].

7.

Turn the GTS on.

8.

Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher [B].

9.

Drive the vehicle for 15 minutes or more [C].

CAUTION:

When performing the confirmation driving pattern, obey all speed limits and traffic laws.


10.

Enter the following menus: Powertrain / Engine / Trouble Codes [D].

11.

Read the pending DTCs.

HINT:
·

If a pending DTC is output, the system is malfunctioning.

·

If a pending DTC is not output, perform the following procedure.



12.

Enter the following menus: Powertrain / Engine / Utility / All Readiness.

13.

Input the DTC: P008A00.

14.

Check the DTC judgment result.

GTS Display Description
NORMAL
·

DTC judgment completed

·

System normal


ABNORMAL
·

DTC judgment completed

·

System abnormal


INCOMPLETE
·

DTC judgment not completed

·

Perform driving pattern after confirming DTC enabling conditions



HINT:
·

If the judgment result is NORMAL, the system is normal.

·

If the judgment result is ABNORMAL, the system has a malfunction.

·

If the judgment result is INCOMPLETE, perform steps [B] through [D] again.




CAUTION / NOTICE / HINT

HINT:

Read Freeze Frame Data using the GTS. The ECM records vehicle and driving condition information as Freeze Frame Data the moment a DTC is stored. When troubleshooting, Freeze Frame Data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.


PROCEDURE

1.CHECK FUEL LEAK
a.

Check around and beneath the vehicle for fuel leaks, fumes, etc.

OK:

No fuel leaks present.



Result:
Proceed to
OK
NG



OK

2.CHECK OTHER DTCS OUTPUT (IN ADDITION TO DTC P008A00)

NG

REPAIR OR REPLACE FUEL LEAK POINT

2.CHECK OTHER DTCS OUTPUT (IN ADDITION TO DTC P008A00)
a.

Read the DTCs.

Powertrain > Engine > Trouble Codes
50001 372
Result:
Result Proceed to
DTC P008A00 is output A
DTC P008A00 and other DTCs are output B


HINT:

If any DTCs other than P008A00 are output, troubleshoot those DTCs first.




A

3.PERFORM ACTIVE TEST USING GTS (CONTROL THE FUEL PUMP DUTY RATIO (BRUSHLESS))

B

GO TO DTC CHART

3.PERFORM ACTIVE TEST USING GTS (CONTROL THE FUEL PUMP DUTY RATIO (BRUSHLESS))
a.

Check whether the fuel pump (for low pressure side) operating sound occurs when performing the Active Test on the GTS.

Powertrain > Engine > Active Test
Tester Display
Control the Fuel Pump Duty Ratio (Brushless)
50004 372 39
Standard:
GTS Operation Standard
High Operating sounds can be heard from fuel pump (for low pressure side)


HINT:

Perform "Inspection After Repair" after replacing the fuel pump (for low pressure side).

Click hereEngine / Hybrid System>M20C-FKS, M20D-FKS (ENGINE CONTROL)>SFI SYSTEM>INITIALIZATION



Result:
Proceed to
OK
NG



OK

4.PERFORM ACTIVE TEST USING GTS (CONTROL THE FUEL PUMP DUTY RATIO (BRUSHLESS))

NG

GO TO FUEL PUMP CONTROL CIRCUIT

Click hereEngine / Hybrid System>M20C-FKS, M20D-FKS (ENGINE CONTROL)>SFI SYSTEM>Fuel Pump Control Circuit


4.PERFORM ACTIVE TEST USING GTS (CONTROL THE FUEL PUMP DUTY RATIO (BRUSHLESS))
a.

Discharge the fuel pressure.

HINT:

DTCs may be stored during this inspection. Check for DTCs and clear them using the GTS.


i.

Remove the EFI-MAIN NO. 2 fuse from the No. 1 engine room relay block and No. 1 junction block assembly.


ii.

Start the engine.


iii.

After the engine has stopped on its own, turn the ignition switch off.

HINT:

If the engine does not stop naturally, perform direct injection by racing the engine to reduce the fuel pressure [Fuel Pressure (High)] and stop the engine.



iv.

Crank the engine again and make sure that the engine does not start.


v.

Install the EFI-MAIN NO. 2 fuse.



b.

Read the value displayed on the GTS when the Active Test was performed.

Powertrain > Engine > Active Test
Active Test Display
Control the Fuel Pump Duty Ratio (Brushless)
Data List Display
Fuel Pressure (Low) / Fuel Pressure 2
50004 372 39 267
Standard:
GTS Operation Standard
Low to High When switching from Low to High, Fuel Pressure (Low) / Fuel Pressure 2 value changes


HINT:

Once the fuel pressure becomes high, the fuel pressure will not decrease, even when switched from High to Low. Therefore, make sure that the fuel pressure is low before checking that the fuel pressure changes when switching from Low to High.



Result:
Proceed to
OK
NG



OK

5.PERFORM ACTIVE TEST USING GTS (CONTROL THE FUEL PUMP DUTY RATIO (BRUSHLESS))

NG

10.PERFORM ACTIVE TEST USING GTS (CONTROL THE FUEL PUMP DUTY RATIO (BRUSHLESS))
5.PERFORM ACTIVE TEST USING GTS (CONTROL THE FUEL PUMP DUTY RATIO (BRUSHLESS))
a.

Discharge the fuel pressure.

HINT:

DTCs may be stored during this inspection. Check for DTCs and clear them using the GTS.


i.

Remove the EFI-MAIN NO. 2 fuse from the No. 1 engine room relay block and No. 1 junction block assembly.


ii.

Start the engine.


iii.

After the engine has stopped on its own, turn the ignition switch off.

HINT:

If the engine does not stop naturally, perform direct injection by racing the engine to reduce the fuel pressure [Fuel Pressure (High)] and stop the engine.



iv.

Crank the engine again and make sure that the engine does not start.


v.

Install the EFI-MAIN NO. 2 fuse.



b.

Read the value displayed on the GTS when the Active Test was performed.

Powertrain > Engine > Active Test
Active Test Display
Control the Fuel Pump Duty Ratio (Brushless)
Data List Display
Fuel Pressure (Low) / Fuel Pressure 2
50004 372 39 267
Standard:
GTS Operation Fuel Pressure (Low) / Fuel Pressure 2
Low 50 kPag or higher
High 420 kPag or higher


HINT:

Once the fuel pressure becomes high, the fuel pressure will not decrease, even when switched from High to Low. Therefore, make sure that the fuel pressure is low before checking that the fuel pressure changes when switching from Low to High.


OK:

Actual Low and High values are as shown above.



Result:
Proceed to
OK
NG



OK

6.PERFORM ACTIVE TEST USING GTS (CONTROL THE FUEL PUMP DUTY RATIO (BRUSHLESS))

NG

9.READ VALUE USING GTS (FUEL PRESSURE (LOW) / FUEL PRESSURE 2)
6.PERFORM ACTIVE TEST USING GTS (CONTROL THE FUEL PUMP DUTY RATIO (BRUSHLESS))
a.

Install the fuel pressure gauge (for low pressure line of low pressure side).

Click hereEngine / Hybrid System>M20C-FKS, M20D-FKS (FUEL)>FUEL SYSTEM>ON-VEHICLE INSPECTION


b.

Compare the values in the Data List using the GTS and the fuel pressure gauge when the Active Test was performed.

Powertrain > Engine > Active Test
Active Test Display
Control the Fuel Pump Duty Ratio (Brushless)
Data List Display
Fuel Pressure (Low) / Fuel Pressure 2
50004 372 39 267
Standard:
GTS Operation Standard
Low Data List value and fuel pressure gauge are within +/-50 kPa of each other
High


HINT:

Perform "Inspection After Repair" after replacing the No. 2 fuel pressure sensor (for low pressure side).

Click hereEngine / Hybrid System>M20C-FKS, M20D-FKS (ENGINE CONTROL)>SFI SYSTEM>INITIALIZATION



Result:
Proceed to
OK
NG



OK

7.CLEAR DTC

NG

REPLACE NO. 2 FUEL PRESSURE SENSOR (FOR LOW PRESSURE SIDE)

Click hereEngine / Hybrid System>M20C-FKS, M20D-FKS (FUEL)>FUEL PRESSURE SENSOR>REMOVAL


7.CLEAR DTC
a.

Clear the DTCs.

Powertrain > Engine > Clear DTCs
50002 372

b.

Turn the ignition switch off and wait for at least 30 seconds.


Result:
Proceed to
NEXT



NEXT

8.CHECK WHETHER DTC OUTPUT RECURS (DTC P008A00)
8.CHECK WHETHER DTC OUTPUT RECURS (DTC P008A00)
a.

Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.


b.

Check the DTC judgment result.

Powertrain > Engine > Utility
Tester Display
All Readiness
50005 372 20

c.

Input the DTC: P008A00.

Result:
Result Proceed to
NORMAL
(DTCs are not output) 		A
ABNORMAL
(DTC P008A00 is output) 		B




A

CHECK FOR INTERMITTENT PROBLEMS

Click hereEngine / Hybrid System>M20C-FKS, M20D-FKS (ENGINE CONTROL)>SFI SYSTEM>CHECK FOR INTERMITTENT PROBLEMS


B

REPLACE ECM

Click hereEngine / Hybrid System>M20C-FKS, M20D-FKS (ENGINE CONTROL)>ECM>REMOVAL


9.READ VALUE USING GTS (FUEL PRESSURE (LOW) / FUEL PRESSURE 2)
a.

Start the engine.


b.

Record the Fuel Pressure (Low) / Fuel Pressure 2 value.

Powertrain > Engine > Data List
Tester Display
Fuel Pressure (Low) / Fuel Pressure 2
50003 372 267

c.

Turn the ignition switch off.


d.

Wait for 10 seconds.


e.

Compare the Fuel Pressure (Low) / Fuel Pressure 2 value recorded with the engine running to the Fuel Pressure (Low) / Fuel Pressure 2 value currently shown on the GTS.

Powertrain > Engine > Data List
Tester Display
Fuel Pressure (Low) / Fuel Pressure 2
50003 372 267
Result:
Result Proceed to
Fuel Pressure (Low) / Fuel Pressure 2 value is maintained A
Fuel Pressure (Low) / Fuel Pressure 2 value drops B


HINT:

Perform "Inspection After Repair" after replacing the fuel pump (for low pressure side).

Click hereEngine / Hybrid System>M20C-FKS, M20D-FKS (ENGINE CONTROL)>SFI SYSTEM>INITIALIZATION




A

REPLACE FUEL PUMP (FOR LOW PRESSURE SIDE)

Click hereEngine / Hybrid System>M20C-FKS, M20D-FKS (FUEL)>FUEL PUMP>REMOVAL


B

REPLACE FUEL MAIN VALVE ASSEMBLY

Click hereEngine / Hybrid System>M20C-FKS, M20D-FKS (FUEL)>FUEL MAIN VALVE>REMOVAL


10.PERFORM ACTIVE TEST USING GTS (CONTROL THE FUEL PUMP DUTY RATIO (BRUSHLESS))
a.

Install the fuel pressure gauge (for low pressure line of low pressure side).

Click hereEngine / Hybrid System>M20C-FKS, M20D-FKS (FUEL)>FUEL SYSTEM>ON-VEHICLE INSPECTION


b.

Read the values in the Data List using the GTS and the fuel pressure gauge when the Active Test was performed.

Powertrain > Engine > Active Test
Active Test Display
Control the Fuel Pump Duty Ratio (Brushless)
Data List Display
Fuel Pressure (Low) / Fuel Pressure 2
50004 372 39 267
Result:
GTS Operation Result Proceed to
Low to High Data List value does not change, but fuel pressure gauge changes A
Data List value and fuel pressure gauge do not change B


HINT:

Perform "Inspection After Repair" after replacing the No. 2 fuel pressure sensor (for low pressure side).

Click hereEngine / Hybrid System>M20C-FKS, M20D-FKS (ENGINE CONTROL)>SFI SYSTEM>INITIALIZATION




A

REPLACE NO. 2 FUEL PRESSURE SENSOR (FOR LOW PRESSURE SIDE)

Click hereEngine / Hybrid System>M20C-FKS, M20D-FKS (FUEL)>FUEL PRESSURE SENSOR>REMOVAL


B

REPLACE FUEL PUMP CONTROL ECU

Click hereEngine / Hybrid System>M20C-FKS, M20D-FKS (FUEL)>FUEL PUMP ECU>REMOVAL