RM38T0EC _51 Engine / Hybrid System _144956 M20F-FXS, M20G-FXS ENGINE CONTROL _0604911 SFI SYSTEM C

M20F-FXS, M20G-FXS 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 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 · 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.

MONITOR STRATEGY

Frequency of Operation

Continuous

CONFIRMATION DRIVING PATTERN

4.781,0.917 5.031,0.5 5.031,0.5 5.198,0.5 false 5.25,0.427 7.104,0.927 1.854,0.5 10 false There is no designated vehicle speed [Engine running] 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 0.521,2.469 1.938,2.823 1.417,0.354 10 false Ignition Switch to 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]

Connect the GTS to the DLC3.

Turn the ignition switch to ON.

Turn the GTS on.

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

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

Turn the ignition switch to ON [A].

Turn the GTS on.

Put the engine in Inspection Mode (Maintenance Mode).

Click hereGeneral>INTRODUCTION>REPAIR INSTRUCTION>INSPECTION MODE PROCEDURE202201,999999,_V1,_107171,_0486700,RM100000001XIMR,

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

10.

With the engine running, drive the vehicle for 15 minutes or more [C].

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

HINT:: If the engine stops, further depress the accelerator pedal to restart the engine.

11.

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

12.

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.

13.

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

14.

Input the DTC: P008A00.

15.

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

NOTICE:: ·

Vehicle Control History may be stored in the hybrid vehicle control ECU assembly if the engine is malfunctioning. Certain vehicle condition information is recorded when Vehicle Control History is stored. Reading the vehicle conditions recorded in both the Freeze Frame Data and Vehicle Control History can be useful for troubleshooting.

Click hereEngine / Hybrid System>HYBRID / BATTERY CONTROL>HYBRID CONTROL SYSTEM>VEHICLE CONTROL HISTORY (RoB)202307,999999,_51,_144957,_0604232,RM100000002BTKF,

(Select Powertrain in Health Check and then check the time stamp data.)

Click hereEngine / Hybrid System>M20F-FXS, M20G-FXS (ENGINE CONTROL)>SFI SYSTEM>DTC CHECK / CLEAR202307,999999,_51,_144956,_0604911,RM100000002BWPH,

·

If any "Engine Malfunction" Vehicle Control History item has been stored in the hybrid vehicle control ECU assembly, make sure to clear it. However, as all Vehicle Control History items are cleared simultaneously, if any Vehicle Control History items other than "Engine Malfunction" are stored, make sure to perform any troubleshooting for them before clearing Vehicle Control History.

Click hereEngine / Hybrid System>HYBRID / BATTERY CONTROL>HYBRID CONTROL SYSTEM>VEHICLE CONTROL HISTORY (RoB)202307,999999,_51,_144957,_0604232,RM100000002BTKF,

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

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

OK:: No fuel leaks present.

Result:

Proceed to
OK
NG

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

REPAIR OR REPLACE FUEL LEAK POINT

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

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.

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

GO TO DTC CHART

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

Enter the following menus.

Powertrain > Engine > Active Test

Tester Display
Control the Fuel Pump Duty Ratio (Brushless)

50004 372 39

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

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>M20F-FXS, M20G-FXS (ENGINE CONTROL)>SFI SYSTEM>INITIALIZATION202307,999999,_51,_144956,_0604911,RM100000002BWPD,

Result:

Proceed to
OK
NG

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

GO TO FUEL PUMP CONTROL CIRCUIT

Click hereEngine / Hybrid System>M20F-FXS, M20G-FXS (ENGINE CONTROL)>SFI SYSTEM>Fuel Pump Control Circuit202307,999999,_51,_144956,_0604911,RM100000002BWSW,

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

Discharge the fuel pressure.

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

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

ii.

Put the engine in Inspection Mode (Maintenance Mode).

Powertrain > Hybrid Control > Utility

Tester Display
Inspection Mode

50005 397 2103

iii.

Start the engine.

iv.

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.

Put the engine in Inspection Mode (Maintenance Mode).

Powertrain > Hybrid Control > Utility

Tester Display
Inspection Mode

50005 397 2103

vi.

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

vii.

Install the EFI-MAIN NO. 2 fuse.

Enter the following menus.

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

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

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

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

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))

Discharge the fuel pressure.

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

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

ii.

Put the engine in Inspection Mode (Maintenance Mode).

Powertrain > Hybrid Control > Utility

Tester Display
Inspection Mode

50005 397 2103

iii.

Start the engine.

iv.

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.

Put the engine in Inspection Mode (Maintenance Mode).

Powertrain > Hybrid Control > Utility

Tester Display
Inspection Mode

50005 397 2103

vi.

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

vii.

Install the EFI-MAIN NO. 2 fuse.

Enter the following menus.

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

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

Standard:

GTS Operation	Fuel Pressure (Low) / Fuel Pressure 2
Low	50 kPa or higher
High	420 kPa 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

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

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

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

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

Click hereEngine / Hybrid System>M20F-FXS, M20G-FXS (FUEL)>FUEL SYSTEM>ON-VEHICLE INSPECTION202307,999999,_51,_144959,_0604265,RM100000002BTT6,

Enter the following menus.

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

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

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 fuel pressure sensor (for low pressure side).; Click hereEngine / Hybrid System>M20F-FXS, M20G-FXS (ENGINE CONTROL)>SFI SYSTEM>INITIALIZATION202307,999999,_51,_144956,_0604911,RM100000002BWPD,

Result:

Proceed to
OK
NG

7.CLEAR DTC

REPLACE FUEL PRESSURE SENSOR (FOR LOW PRESSURE SIDE)

Click hereEngine / Hybrid System>M20F-FXS, M20G-FXS (FUEL)>FUEL PRESSURE SENSOR>REMOVAL202307,999999,_51,_144959,_0604268,RM100000002BTTG,

7.CLEAR DTC

Clear the DTCs.

Powertrain > Engine > Clear DTCs: 50002 372

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

Result:

Proceed to
NEXT

8.CHECK WHETHER DTC OUTPUT RECURS (DTC P008A00)

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

Enter the following menus.

Powertrain > Engine > Utility

Tester Display
All Readiness

50005 372 20

Input the DTC: P008A00.

Check the DTC judgment result.

Result:

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

CHECK FOR INTERMITTENT PROBLEMS

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REPLACE ECM

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

Put the engine in Inspection Mode (Maintenance Mode).

Powertrain > Hybrid Control > Utility

Tester Display
Inspection Mode

50005 397 2103

Start the engine.

Enter the following menus.

Powertrain > Engine > Data List

Tester Display
Fuel Pressure (Low) / Fuel Pressure 2

50003 372 267

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

Turn the ignition switch off.

Wait for 10 seconds.

Enter the following menus.

Powertrain > Engine > Data List

Tester Display
Fuel Pressure (Low) / Fuel Pressure 2

50003 372 267

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.

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>M20F-FXS, M20G-FXS (ENGINE CONTROL)>SFI SYSTEM>INITIALIZATION202307,999999,_51,_144956,_0604911,RM100000002BWPD,

REPLACE FUEL PUMP (FOR LOW PRESSURE SIDE)

Click hereEngine / Hybrid System>M20F-FXS, M20G-FXS (FUEL)>FUEL PUMP>REMOVAL202307,999999,_51,_144959,_0604273,RM100000002BTTR,

REPLACE FUEL MAIN VALVE ASSEMBLY

Click hereEngine / Hybrid System>M20F-FXS, M20G-FXS (FUEL)>FUEL MAIN VALVE>REMOVAL202307,999999,_51,_144959,_0604292,RM100000002BTTY,

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

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

Click hereEngine / Hybrid System>M20F-FXS, M20G-FXS (FUEL)>FUEL SYSTEM>ON-VEHICLE INSPECTION202307,999999,_51,_144959,_0604265,RM100000002BTT6,

Enter the following menus.

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

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

Result:

GTS Operation	Result	Proceed to
Low to High	Data List value does not change, but fuel pressure gauge changes	A
Low to High	Data List value and fuel pressure gauge do not change	B

HINT:: Perform "Inspection After Repair" after replacing the fuel pressure sensor (for low pressure side).; Click hereEngine / Hybrid System>M20F-FXS, M20G-FXS (ENGINE CONTROL)>SFI SYSTEM>INITIALIZATION202307,999999,_51,_144956,_0604911,RM100000002BWPD,

REPLACE FUEL PRESSURE SENSOR (FOR LOW PRESSURE SIDE)

Click hereEngine / Hybrid System>M20F-FXS, M20G-FXS (FUEL)>FUEL PRESSURE SENSOR>REMOVAL202307,999999,_51,_144959,_0604268,RM100000002BTTG,

REPLACE FUEL PUMP CONTROL ECU

Click hereEngine / Hybrid System>M20F-FXS, M20G-FXS (FUEL)>FUEL PUMP ECU>REMOVAL202307,999999,_51,_144959,_0604272,RM100000002BTTP,