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

M20F-FXS, M20G-FXS ENGINE CONTROL  SFI SYSTEM  Fuel Pump Control Circuit  


DESCRIPTION

The fuel pump (for low pressure side) circuit consists of the ECM, fuel pump (for low pressure side) and fuel pump control ECU (which operates the fuel pump (for low pressure side)). Based on the engine output, the ECM determines the fuel pump speed. The speed is then converted to a duty signal and sent to the fuel pump control ECU. Based on the signal sent from the ECM, the fuel pump control ECU adjusts the fuel pump (for low pressure side) operation speed.

WIRING DIAGRAM

A539679E01
6.656,0.656 6.969,0.854 0.313,0.198 10 false IC 5.792,4.563 6.031,4.76 0.24,0.198 10 false 16 6.073,4.573 6.531,4.771 0.458,0.198 10 false FPC 6.333,6.031 6.75,6.281 0.417,0.25 10 false A47 6.333,6.208 6.802,6.458 0.469,0.25 10 false ECM 4.802,4.688 5.26,4.885 0.458,0.198 10 false O66 4.906,4.51 5.063,4.708 0.156,0.198 10 false 2 4.802,5.542 5.26,5.74 0.458,0.198 10 false O66 4.875,5.365 5.031,5.563 0.156,0.198 10 false 3 4.469,4.583 4.927,4.781 0.458,0.198 10 false FPC 4.438,5.542 4.896,5.74 0.458,0.198 10 false GND 2.5,5.667 2.781,5.938 0.281,0.271 10 false *1 3.885,4.948 4.198,5.146 0.313,0.198 10 false *2 2.677,6.417 3.792,6.74 1.115,0.323 10 false *1: Shielded 3.917,6.417 5.75,6.615 1.833,0.198 10 false *2: Diagnosis Output Circuit 3.333,6.031 5.74,6.344 2.406,0.313 10 false Fuel Pump Control ECU 4.802,4.125 5.26,4.323 0.458,0.198 10 false O66 4.542,4.146 4.854,4.344 0.313,0.198 10 false +B 4.885,3.948 5.042,4.146 0.156,0.198 10 false 1 3.333,3.917 3.792,4.115 0.458,0.198 10 false FPU 3.344,4.469 3.802,4.667 0.458,0.198 10 false FPV 3.354,5 3.813,5.198 0.458,0.198 10 false FPW 3.354,5.552 3.813,5.75 0.458,0.198 10 false FPG 2.99,3.906 3.448,4.104 0.458,0.198 10 false O67 3.083,3.74 3.24,3.938 0.156,0.198 10 false 2 2.99,4.438 3.448,4.635 0.458,0.198 10 false O67 3.083,4.26 3.24,4.458 0.156,0.198 10 false 3 2.99,4.979 3.448,5.177 0.458,0.198 10 false O67 3.083,4.802 3.24,5 0.156,0.198 10 false 4 3,5.51 3.458,5.708 0.458,0.198 10 false O67 3.073,5.354 3.229,5.552 0.156,0.198 10 false 1 1.531,5.531 2.063,5.802 0.531,0.271 10 false BLPE 1.479,4.979 2.094,5.177 0.615,0.198 10 false BLPW 1.542,4.469 2.156,4.667 0.615,0.198 10 false BLPV 1.552,3.927 2.167,4.125 0.615,0.198 10 false BLPU 1.969,3.823 2.125,4.021 0.156,0.198 10 false 3 1.979,4.365 2.135,4.563 0.156,0.198 10 false 4 1.979,4.885 2.135,5.083 0.156,0.198 10 false 2 1.99,5.406 2.146,5.604 0.156,0.198 10 false 1 0.938,6.042 1.396,6.24 0.458,0.198 10 false O45 0.938,6.219 2.198,6.823 1.26,0.604 10 false Fuel Pump (for Low Pressure Side) 4.563,2.938 5.563,3.292 1,0.354 10 false EFI-MAIN NO.2 5.344,2.5 5.5,2.698 0.156,0.198 10 false 3 4.594,2.49 4.813,2.729 0.219,0.24 10 false 5 1.698,2.781 3.052,3.167 1.354,0.385 10 false EFI-MAIN NO.2 5.365,2.042 5.521,2.24 0.156,0.198 10 false 1 4.594,2.031 4.844,2.271 0.25,0.24 10 false 2 2.823,1.167 2.979,1.365 0.156,0.198 10 false 3 2.073,1.625 3.156,1.906 1.083,0.281 10 false EFI-MAIN NO.1 2.042,1.167 2.198,1.365 0.156,0.198 10 false 5 0.583,1.438 1.646,1.75 1.063,0.313 10 false EFI-MAIN NO.1 2.031,0.531 2.188,0.729 0.156,0.198 10 false 2 2.823,0.521 2.979,0.719 0.156,0.198 10 false 1 5.792,0.531 6.104,0.813 0.313,0.281 10 false 15 6.073,0.521 6.573,0.802 0.5,0.281 10 false MREL 0.417,4.125 0.823,4.625 0.406,0.5 10 false BATT MAIN 0.573,5.292 1.188,5.719 0.615,0.427 10 false Auxiliary Battery

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses for circuits related to this system before performing the following procedure.


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.PERFORM ACTIVE TEST USING GTS (ACTIVATE THE CIRCUIT RELAY (BRUSHLESS))

NG

REPAIR OR REPLACE FUEL LEAK POINT

2.PERFORM ACTIVE TEST USING GTS (ACTIVATE THE CIRCUIT RELAY (BRUSHLESS))
a.

Enter the following menus.

Powertrain > Engine > Active Test
Tester Display
Activate the Circuit Relay (Brushless)
50004 372 40

b.

Check whether the fuel pump operating sound occurs when performing the Active Test on the GTS.

Standard:
GTS Operation Standard
ON Operating sounds can be heard from fuel pump (for low pressure side)



Result:
Proceed to
OK
NG



OK

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

NG

7.PERFORM ACTIVE TEST USING GTS (FUEL PUMP SINGLE PHASE ENERGIZATION)
3.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>M20F-FXS, M20G-FXS (FUEL)>FUEL SYSTEM>ON-VEHICLE INSPECTION


b.

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

c.

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>INITIALIZATION


Result:
Proceed to
OK
NG



OK

4.READ VALUE USING GTS (FUEL PRESSURE)

NG

REPLACE FUEL PRESSURE SENSOR (FOR LOW PRESSURE SIDE)

Click hereEngine / Hybrid System>M20F-FXS, M20G-FXS (FUEL)>FUEL PRESSURE SENSOR>REMOVAL


4.READ VALUE USING GTS (FUEL PRESSURE)
a.

Enter the following menus.

Powertrain > Engine > Data List
Tester Display
Target Fuel Pressure (Low) / Target Fuel Pressure 2
Fuel Pressure (Low) / Fuel Pressure 2
Low Fuel Pressure Sensor
50003 372 266,267,545

b.

Read the values displayed on the GTS while the engine is cranking.

Result:
Result Proceed to
Low Fuel Pressure Sensor value is within +/- 65 kPa of the Target Fuel Pressure (Low) / Target Fuel Pressure 2 A
Low Fuel Pressure Sensor value is more than 65 kPa higher than the Target Fuel Pressure (Low) / Target Fuel Pressure 2 B
Low Fuel Pressure Sensor value is more than 65 kPa lower than the Target Fuel Pressure (Low) / Target Fuel Pressure 2 C



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>INITIALIZATION



A

5.CHECK FUEL PRESSURE

B

REPLACE FUEL PUMP (FOR LOW PRESSURE SIDE)

Click hereEngine / Hybrid System>M20F-FXS, M20G-FXS (FUEL)>FUEL PUMP>REMOVAL

HINT:

Relief blockage such as clogging of the jet pump is suspected.



C

6.CHECK SHORTAGE OF FUEL
5.CHECK FUEL PRESSURE
a.

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

Click hereEngine / Hybrid System>M20F-FXS, M20G-FXS (FUEL)>FUEL SYSTEM>ON-VEHICLE INSPECTION


b.

Start the engine.


c.

Measure the fuel pressure at idle.

Standard Fuel Pressure:

300 to 530 kPa (3.1 to 5.4 kgf/cm2, 44 to 77 psi)


HINT:

Refer to Standard Idle Speed.

Click hereEngine / Hybrid System>M20F-FXS, M20G-FXS (ENGINE MECHANICAL)>ENGINE>ON-VEHICLE INSPECTION



d.

Stop the engine.


e.

Check that the fuel pressure remains as specified for 5 minutes.

Standard Fuel Pressure:

98 kPa (1.0 kgf/cm2, 14.2 psi) or more



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>INITIALIZATION


Result:
Proceed to
OK
NG



OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

Click hereEngine / Hybrid System>M20F-FXS, M20G-FXS (ENGINE CONTROL)>SFI SYSTEM>PROBLEM SYMPTOMS TABLE


NG

REPLACE FUEL PUMP (FOR LOW PRESSURE SIDE)

Click hereEngine / Hybrid System>M20F-FXS, M20G-FXS (FUEL)>FUEL PUMP>REMOVAL


6.CHECK SHORTAGE OF FUEL
a.

Check the amount of fuel remaining.


HINT:
·

No fuel remains in the fuel tank: Malfunction of the fuel sender gauge assembly is suspected.

·

Only the fuel pump side fuel chamber has no fuel remaining: Malfunction of the jet pump is suspected.

·

Fuel remains in the fuel tank: Malfunction of the fuel pump (for low pressure side) is suspected.

·

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>INITIALIZATION



Result:
Proceed to
NEXT



NEXT

REPLACE FUEL PUMP (FOR LOW PRESSURE SIDE)

Click hereEngine / Hybrid System>M20F-FXS, M20G-FXS (FUEL)>FUEL PUMP>REMOVAL


7.PERFORM ACTIVE TEST USING GTS (FUEL PUMP SINGLE PHASE ENERGIZATION)
A435588C39
0.5,0.833 0.958,1.146 0.458,0.313 1.229,1.802 1.531,1.438 true 2.198,1.771 1.927,1.438 true 2.344,0.417 1.938,0.896 true 0.958,1.844 1.573,2.042 0.615,0.198 10 false BLPU 2.135,1.844 2.75,2.042 0.615,0.198 10 false BLPV 2.26,0.219 2.875,0.417 0.615,0.198 10 false BLPW 0.052,0.052 0.365,0.25 0.313,0.198 10 false *a 0.594,0.896 1.052,1.094 0.458,0.198 10 false O45
*a Front view of wire harness connector
(to Fuel Pump (for low pressure side))


a.

Disconnect the fuel pump (for low pressure side) connector.


b.

Enter the following menus.

Powertrain > Engine > Active Test
Tester Display
Fuel Pump Single Phase Energization
50004 372 49

c.

Operate the fuel pump control ECU using the Active Test function and measure the voltage according to the value(s) in the table below.

Standard Voltage:
Tester Connection GTS Operation Specified Condition
O45-3 (BLPU) - Body ground U Phase 4.4 to 8.4 V*
O45-4 (BLPV) - Body ground V Phase 4.4 to 8.4 V*
O45-2 (BLPW) - Body ground W Phase 4.4 to 8.4 V*


HINT:
·

*: This Active Test restricts the fuel pump control ECU output duty cycle to 50%. Therefore, the output voltage of the fuel pump control ECU will be approximately 50% of the power source voltage.

·

Before performing this inspection, check that the auxiliary battery voltage is between 11 and 14 V (not depleted).

·

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>INITIALIZATION




Result:
Proceed to
OK
NG



OK

REPLACE FUEL PUMP (FOR LOW PRESSURE SIDE)

Click hereEngine / Hybrid System>M20F-FXS, M20G-FXS (FUEL)>FUEL PUMP>REMOVAL


NG

8.CHECK HARNESS AND CONNECTOR (FUEL PUMP (FOR LOW PRESSURE SIDE) - FUEL PUMP CONTROL ECU)
8.CHECK HARNESS AND CONNECTOR (FUEL PUMP (FOR LOW PRESSURE SIDE) - FUEL PUMP CONTROL ECU)
a.

Disconnect the fuel pump (for low pressure side) connector.


b.

Disconnect the fuel pump control ECU connector.


c.

Measure the resistance according to the value(s) in the table below.

Standard Resistance:
Tester Connection Condition Specified Condition
O45-3 (BLPU) - O67-2 (FPU) Always Below 1 Ω
O45-4 (BLPV) - O67-3 (FPV) Always Below 1 Ω
O45-2 (BLPW) - O67-4 (FPW) Always Below 1 Ω
O45-3 (BLPU) or O67-2 (FPU) - Body ground and other terminals Always 10 kΩ or higher
O45-4 (BLPV) or O67-3 (FPV) - Body ground and other terminals Always 10 kΩ or higher
O45-2 (BLPW) or O67-4 (FPW) - Body ground and other terminals Always 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

9.CHECK HARNESS AND CONNECTOR (POWER SOURCE OF FUEL PUMP CONTROL ECU)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

9.CHECK HARNESS AND CONNECTOR (POWER SOURCE OF FUEL PUMP CONTROL ECU)
A539671C01
0.5,1.083 0.917,1.333 0.417,0.25 1.083,1.708 1.417,1.333 true 2.26,1.729 1.969,1.344 true 0.125,0.125 0.438,0.281 0.313,0.156 10 false *a 0.573,1.115 1.021,1.333 0.448,0.219 10 false O66 0.979,1.729 1.427,1.948 0.448,0.219 10 false +B 2.177,1.771 2.625,1.99 0.448,0.219 10 false GND
*a Front view of wire harness connector
(to Fuel Pump Control ECU)


a.

Disconnect the fuel pump control ECU connector.


b.

Turn the ignition switch to ON.


c.

Measure the voltage according to the value(s) in the table below.

Standard Voltage:
Tester Connection Condition Specified Condition
O66-1 (+B) - O66-3 (GND) Ignition switch ON 11 to 14 V



Result:
Proceed to
OK
NG



OK

10.INSPECT ECM (FPC TERMINAL)

NG

12.CHECK HARNESS AND CONNECTOR (FUEL PUMP CONTROL ECU - BODY GROUND)
10.INSPECT ECM (FPC TERMINAL)
A539671C02
0.417,1.083 0.833,1.333 0.417,0.25 1.417,1.833 1.719,1.344 true 0.135,0.083 0.448,0.24 0.313,0.156 10 false *a 1.25,1.865 1.677,2.052 0.427,0.188 10 false FPC 0.5,1.125 1.021,1.375 0.521,0.25 10 false O66
*a Front view of wire harness connector
(to Fuel Pump Control ECU)


a.

Disconnect the fuel pump control ECU connector.


b.

Enter the following menus.

Powertrain > Engine > Active Test
Tester Display
Fuel Pump Single Phase Energization
50004 372 49

c.

Operate the fuel pump control ECU using the Active Test function and measure the resistance according to the value(s) in the table below.

Standard Resistance:
Tester Connection GTS Operation Specified Condition
O66-2 (FPC) - Body ground Before Active Test → During Active Test Before Active Test: Resistance is stable → During Active Test: Resistance fluctuates*


HINT:

*: Using the Active Test, duty control of the transistors in the ECM will be performed. Due to the duty control, resistance of the FPC terminal will be unstable during the Active Test. If the resistance is stable before the Active Test and fluctuates while performing the Active Test, it can be determined that the transistor is operating. If the transistor does not operate during the Active Test, the ECM may be malfunctioning.



Result:
Proceed to
OK
NG



OK

REPLACE FUEL PUMP CONTROL ECU

Click hereEngine / Hybrid System>M20F-FXS, M20G-FXS (FUEL)>FUEL PUMP ECU>REMOVAL


NG

11.CHECK HARNESS AND CONNECTOR (FUEL PUMP CONTROL ECU - ECM)
11.CHECK HARNESS AND CONNECTOR (FUEL PUMP CONTROL ECU - ECM)
a.

Disconnect the fuel pump control ECU connector.


b.

Disconnect the ECM connector.


c.

Measure the resistance according to the value(s) in the table below.

Standard Resistance:
Tester Connection Condition Specified Condition
O66-2 (FPC) - A47-16 (FPC) Always Below 1 Ω
O66-2 (FPC) or A47-16 (FPC) - Body ground and other terminals Always 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

REPLACE ECM

Click hereEngine / Hybrid System>M20F-FXS, M20G-FXS (ENGINE CONTROL)>ECM>REMOVAL


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

12.CHECK HARNESS AND CONNECTOR (FUEL PUMP CONTROL ECU - BODY GROUND)
a.

Disconnect the fuel pump control ECU connector.


b.

Measure the resistance according to the value(s) in the table below.

Standard Resistance:
Tester Connection Condition Specified Condition
O66-3 (GND) - Body ground Always Below 1 Ω



Result:
Proceed to
OK
NG



OK

13.CHECK TERMINAL VOLTAGE (POWER SOURCE OF EFI-MAIN NO. 2 RELAY)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

13.CHECK TERMINAL VOLTAGE (POWER SOURCE OF EFI-MAIN NO. 2 RELAY)
a.

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


b.

Measure the voltage according to the value(s) in the table below.

Standard Voltage:
Tester Connection Condition Specified Condition
5 (EFI-MAIN NO. 2 relay holder) - Body ground Always 11 to 14 V



Result:
Proceed to
OK
NG



OK

14.INSPECT EFI-MAIN NO. 2 RELAY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (AUXILIARY BATTERY - EFI-MAIN NO. 2 RELAY)

14.INSPECT EFI-MAIN NO. 2 RELAY

Click hereEngine / Hybrid System>M20F-FXS, M20G-FXS (ENGINE CONTROL)>RELAY>ON-VEHICLE INSPECTION

Result:
Proceed to
OK
NG



OK

15.CHECK HARNESS AND CONNECTOR (EFI-MAIN NO. 1 RELAY - EFI-MAIN NO. 2 RELAY)

NG

REPLACE EFI-MAIN NO. 2 RELAY

15.CHECK HARNESS AND CONNECTOR (EFI-MAIN NO. 1 RELAY - EFI-MAIN NO. 2 RELAY)
a.

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


b.

Remove the VVT relay, D INJ relay, EFI-MAIN NO. 3 relay from the No. 1 engine room relay block.

HINT:

Remove the VVT relay, D INJ relay and EFI-MAIN NO. 3 relay connected between the checked terminals as the coil inside the relay influences the measurement value.



c.

Measure the resistance according to the value(s) in the table below.

Standard Resistance:
Tester Connection Condition Specified Condition
3 (EFI-MAIN NO. 1 relay) - 2 (EFI-MAIN NO. 2 relay) Always Below 1 Ω
3 (EFI-MAIN NO. 1 relay) or 2 (EFI-MAIN NO. 2 relay) - Body ground and other terminals Always 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

16.CHECK HARNESS AND CONNECTOR (EFI-MAIN NO. 2 RELAY - BODY GROUND)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

16.CHECK HARNESS AND CONNECTOR (EFI-MAIN NO. 2 RELAY - BODY GROUND)
a.

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


b.

Measure the resistance according to the value(s) in the table below.

Standard Resistance:
Tester Connection Condition Specified Condition
1 (EFI-MAIN NO. 2 relay) - Body ground Always Below 1 Ω



Result:
Proceed to
OK
NG



OK

17.CHECK HARNESS AND CONNECTOR (EFI-MAIN NO. 2 RELAY - FUEL PUMP CONTROL ECU)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

17.CHECK HARNESS AND CONNECTOR (EFI-MAIN NO. 2 RELAY - FUEL PUMP CONTROL ECU)
a.

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


b.

Disconnect the fuel pump control ECU connector.


c.

Measure the resistance according to the value(s) in the table below.

Standard Resistance:
Tester Connection Condition Specified Condition
3 (EFI-MAIN NO. 2 relay holder) - O66-1 (+B) Always Below 1 Ω
3 (EFI-MAIN NO. 2 relay holder) or O66-1 (+B) - Body ground and other terminals Always 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

GO TO ECM POWER SOURCE CIRCUIT

Click hereEngine / Hybrid System>M20F-FXS, M20G-FXS (ENGINE CONTROL)>SFI SYSTEM>ECM Power Source Circuit


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR