M20C-FKS, M20D-FKS ENGINE CONTROL  SFI SYSTEM  Fuel Pump Control Circuit  

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

OK:

No fuel leaks present.

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

Powertrain > Engine > Active Test

Tester Display
Activate the Circuit Relay (Brushless)

50004 372 40

Standard:

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

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 INSPECTION202111,999999,_51,_111793,_0504174,RM100000001ZHDC_01_0001,

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 kPag 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>INITIALIZATION202303,999999,_51,_111785,_0504416,RM1000000029BFF,

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

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

Result:

Result	Proceed to
Low Fuel Pressure Sensor value is within +/- 65 kPag of the Target Fuel Pressure (Low) / Target Fuel Pressure 2	A
Low Fuel Pressure Sensor value is more than 65 kPag higher than the target fuel pressure (low) / Target Fuel Pressure 2	B
Low Fuel Pressure Sensor value is more than 65 kPag lower than the target fuel pressure (low) / Target Fuel Pressure 2	C

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 INSPECTION202111,999999,_51,_111793,_0504174,RM100000001ZHDC_01_0001,

Start the engine.

Measure the fuel pressure at idle.

Standard Fuel Pressure:

196 to 833 kPa (2.0 to 8.5 kgf/cm², 28 to 121 psi)

HINT:

Refer to Standard Idle Speed.

Click hereEngine / Hybrid System>M20C-FKS, M20D-FKS (ENGINE MECHANICAL)>ENGINE>ON-VEHICLE INSPECTION202111,999999,_51,_111786,_0499716,RM100000001YZHY_01_0016,

Stop the engine.

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>M20C-FKS, M20D-FKS (ENGINE CONTROL)>SFI SYSTEM>INITIALIZATION202303,999999,_51,_111785,_0504416,RM1000000029BFF,

Check the amount of fuel remaining.

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

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

Powertrain > Engine > Active Test

Tester Display
Fuel Pump Single Phase Energization

50004 372 49

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
Click Location & Routing(L22)Location & Routingewd_type=routing;type=c;code=L22 Click Connector(L22)Body>No. 2 Floor Wire>Fuel Suction Tube with Pump and Gage Assemblyewd_type=component;type=c;code=L22;pinno=3,4,2
L22-3 (BLPU) - Body ground	U Phase	4.4 to 8.4 V*
L22-4 (BLPV) - Body ground	V Phase	4.4 to 8.4 V*
L22-2 (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 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>M20C-FKS, M20D-FKS (ENGINE CONTROL)>SFI SYSTEM>INITIALIZATION202303,999999,_51,_111785,_0504416,RM1000000029BFF,

Disconnect the fuel pump control ECU connector.

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

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
Click Location & Routing(L11,L22)Location & Routingewd_type=routing;type=c,c;code=L11,L22 Click Connector(L11)Body>No. 2 Floor Wire>Fuel Pump Control ECUewd_type=component;type=c;code=L11;pinno=2,3,4 Click Connector(L22)Body>No. 2 Floor Wire>Fuel Suction Tube with Pump and Gage Assemblyewd_type=component;type=c;code=L22;pinno=3,4,2
L11-2 (FPU) - L22-3 (BLPU)	Always	Below 1 Ω
L11-3 (FPV) - L22-4 (BLPV)	Always	Below 1 Ω
L11-4 (FPW) - L22-2 (BLPW)	Always	Below 1 Ω
L11-2 (FPU) or L22-3 (BLPU) - Body ground and other terminals	Always	10 kΩ or higher
L11-3 (FPV) or L22-4 (BLPV) - Body ground and other terminals	Always	10 kΩ or higher
L11-4 (FPW) or L22-2 (BLPW) - Body ground and other terminals	Always	10 kΩ or higher

Disconnect the fuel pump control ECU connector.

Turn the ignition switch to ON.

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

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
Click Location & Routing(L12)Location & Routingewd_type=routing;type=c;code=L12 Click Connector(L12)Body>No. 2 Floor Wire>Fuel Pump Control ECUewd_type=component;type=c;code=L12;pinno=1,3
L12-1 (+B) - L12-3 (GND)	Ignition switch ON	11 to 14 V

Disconnect the fuel pump control ECU connector.

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

Powertrain > Engine > Active Test

Tester Display
Fuel Pump Single Phase Energization

50004 372 49

Standard Resistance:

Tester Connection	GTS Operation	Specified Condition
Click Location & Routing(L12)Location & Routingewd_type=routing;type=c;code=L12 Click Connector(L12)Body>No. 2 Floor Wire>Fuel Pump Control ECUewd_type=component;type=c;code=L12;pinno=2
L12-2 (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.

Disconnect the fuel pump control ECU connector.

Disconnect the ECM connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
Click Location & Routing(L12,A109)Location & Routingewd_type=routing;type=c,c;code=L12,A109 Click Connector(L12)Body>No. 2 Floor Wire>Fuel Pump Control ECUewd_type=component;type=c;code=L12;pinno=2 Click Connector(A109)Engine Compartment>Engine Room Main Wire / Transmission Wire>ECMewd_type=component;type=c;code=A109;pinno=61
L12-2 (FPC) - A109-61 (FPC)	Always	Below 1 Ω
L12-2 (FPC) or A109-61 (FPC) - Body ground and other terminals	Always	10 kΩ or higher

Disconnect the fuel pump control ECU connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
Click Location & Routing(L12)Location & Routingewd_type=routing;type=c;code=L12 Click Connector(L12)Body>No. 2 Floor Wire>Fuel Pump Control ECUewd_type=component;type=c;code=L12;pinno=3
L12-3 (GND) - Body ground	Always	Below 1 Ω

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

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
3 (EFI-MAIN NO. 2 relay) - Body ground	Always	11 to 14 V

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

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

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.

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

Standard Resistance:

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

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

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

Standard Resistance:

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

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

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
Click Location & Routing(L12)Location & Routingewd_type=routing;type=c;code=L12 Click Connector(L12)Body>No. 2 Floor Wire>Fuel Pump Control ECUewd_type=component;type=c;code=L12;pinno=1
5 (EFI-MAIN NO. 2 relay) - L12-1 (+B)	Always	Below 1 Ω
5 (EFI-MAIN NO. 2 relay) or L12-1 (+B) - Body ground and other terminals	Always	10 kΩ or higher