Fuel Pump Control Circuit [12/2017 - 08/2018]: Procedure

CHECK FUEL LEAK

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

No fuel leaks present.

Result

Proceed to
OK
NG

Result:

REPAIR OR REPLACE FUEL LEAK POINT

Result:

See step 2

PERFORM ACTIVE TEST USING TECHSTREAM (ACTIVATE THE CIRCUIT RELAY)

Connect the Techstream to the DLC3.
Turn the engine switch on (IG).
Turn the Techstream on.

Enter the following menus: Powertrain / Engine / Active Test / Activate the Circuit Relay.

Powertrain > Engine > Active Test

Tester Display
Activate the Circuit Relay

Standard

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

Result

Proceed to
OK
NG

Result:

See step 7

Result:

See step 3

PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE FUEL PUMP DUTY RATIO)

Install the fuel pressure gauge (for low pressure line of low pressure side).
Refer to PROCEDURE - Step 2
Connect the Techstream to the DLC3.
Turn the engine switch on (IG).
Turn the Techstream on.

Enter the following menus: Powertrain / Engine / Active Test / Control the Fuel Pump Duty Ratio / Data List / Fuel Pressure (Low) / Fuel Pressure 2.

Powertrain > Engine > Active Test

Active Test Display
Control the Fuel Pump Duty Ratio

Data List Display
Fuel Pressure (Low) / Fuel Pressure 2

Standard

Techstream 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 fuel pressure sensor (for low pressure side).

Refer to INITIALIZATION [09/2015 - 08/2019]

Result

Proceed to
OK
NG

Result:

REPLACE FUEL DELIVERY PIPE SUB-ASSEMBLY (FUEL PRESSURE SENSOR (FOR LOW PRESSURE SIDE)). Refer to REMOVAL [08/2016 - 08/2019]

Result:

See step 4

READ VALUE USING TECHSTREAM (FUEL PRESSURE)

Connect the Techstream to the DLC3.
Turn the engine switch on (IG).
Turn the Techstream on.

Enter the following menus: Powertrain / Engine / Data List / Target Fuel Pressure (Low) / Target Fuel Pressure 2, Fuel Pressure (Low) / Fuel Pressure 2 and Low Fuel Pressure Sensor.

Powertrain > Engine > Data List

Tester Display
Target Fuel Pressure (Low) / Target Fuel Pressure 2
Fuel Pressure (Low) / Fuel Pressure 2
Low Fuel Pressure Sensor

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

Result:

REPLACE FUEL PUMP (FOR LOW PRESSURE SIDE)

for TMC made: Refer to REMOVAL [12/2017 - 08/2019]
for TMMC made: Refer to REMOVAL [08/2016 - 08/2019]

HINT:

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

Result:

See step 6

Result:

See step 5

CHECK FUEL PRESSURE

Install the fuel pressure gauge (for low pressure line of low pressure side).
Refer to PROCEDURE - Step 2
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.

Refer to PROCEDURE - Step 10
Stop the engine.

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

Standard Fuel Pressure

98 kPa (1.0 kgf/cm² , 14 psi) or more

HINT:

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

Refer to INITIALIZATION [09/2015 - 08/2019]

Result

Proceed to
OK
NG

Result:

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

Refer to PROBLEM SYMPTOMS TABLE [12/2017 - ]

HINT:

If the difference between Target Fuel Pressure (Low) / Target Fuel Pressure 2 and Low Fuel Pressure Sensor is more than 200 kPa in the freeze frame data of DTC (P0087-00, P0190-2A, P107A-2A) and the malfunctioning part could not be identified, replace the fuel pump (for low pressure side) as the fuel supply system, which cannot reproduce symptoms easily, may be malfunctioning.

Result:

REPLACE FUEL PUMP (FOR LOW PRESSURE SIDE)

for TMC made: Refer to REMOVAL [12/2017 - 08/2019]
for TMMC made: Refer to REMOVAL [08/2016 - 08/2019]

CHECK SHORTAGE OF FUEL

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).
Refer to INITIALIZATION [09/2015 - 08/2019]

Result

Proceed to
NEXT

Result:

REPLACE FUEL PUMP (FOR LOW PRESSURE SIDE)

for TMC made: Refer to REMOVAL [12/2017 - 08/2019]
for TMMC made: Refer to REMOVAL [08/2016 - 08/2019]

PERFORM ACTIVE TEST USING TECHSTREAM (FUEL PUMP SINGLE PHASE ENERGIZATION)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

*a	Front view of wire harness connector (to Fuel Pump (for low pressure side))

Disconnect the fuel pump (for low pressure side) connector.
Connect the Techstream to the DLC3.
Turn the engine switch on (IG).
Turn the Techstream on.

Enter the following menus: Powertrain / Engine / Active Test / Fuel Pump Single Phase Energization.

Powertrain > Engine > Active Test

Tester Display
Fuel Pump Single Phase Energization

Operate the fuel pump control ECU assembly 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
S11-3 (BLPU) - Body ground	U Phase	4.4 to 8.4 V*
S11-4 (BLPV) - Body ground	V Phase	4.4 to 8.4 V*
S11-2 (BLPW) - Body ground	W Phase	4.4 to 8.4 V*

HINT:

*: This Active Test restricts the fuel pump control ECU assembly output duty cycle to 50%. Therefore, the output voltage of the fuel pump control ECU assembly 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).
Refer to INITIALIZATION [09/2015 - 08/2019]

Result

Proceed to
OK
NG

Result:

REPLACE FUEL PUMP (FOR LOW PRESSURE SIDE)

for TMC made: Refer to REMOVAL [12/2017 - 08/2019]
for TMMC made: Refer to REMOVAL [08/2016 - 08/2019]

Result:

See step 8

CHECK HARNESS AND CONNECTOR (FUEL PUMP CONTROL ECU ASSEMBLY - FUEL PUMP (FOR LOW PRESSURE SIDE))

Disconnect the fuel pump control ECU assembly 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
S48-2 (FPU) - S11-3 (BLPU)	Always	Below 1 Ω
S48-3 (FPV) - S11-4 (BLPV)	Always	Below 1 Ω
S48-4 (FPW) - S11-2 (BLPW)	Always	Below 1 Ω
S48-2 (FPU) or S11-3 (BLPU) - Body ground and other terminals	Always	10 kΩ or higher
S48-3 (FPV) or S11-4 (BLPV) - Body ground and other terminals	Always	10 kΩ or higher
S48-4 (FPW) or S11-2 (BLPW) - Body ground and other terminals	Always	10 kΩ or higher

Result

Proceed to
OK
NG

Result:

REPAIR OR REPLACE HARNESS OR CONNECTOR

Result:

See step 9

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

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

*a	Front view of wire harness connector (to Fuel Pump Control ECU Assembly)

Disconnect the fuel pump control ECU assembly connector.
Turn the engine switch on (IG).

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

Standard Voltage

Tester Connection	Condition	Specified Condition
S49-1 (+B) - S49-3 (GND)	Engine switch on (IG)	11 to 14 V

HINT:

Make a note of the measured voltage as it may be used in a following Active Test.

Result

Proceed to
OK
NG

Result:

See step 12

Result:

See step 10

INSPECT ECM (FPC TERMINAL)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

*a	Front view of wire harness connector (to Fuel Pump Control ECU Assembly)

Disconnect the fuel pump control ECU assembly connector.
Connect the Techstream to the DLC3.
Turn the engine switch on (IG).
Turn the Techstream on.

Enter the following menus: Powertrain / Engine / Active Test / Fuel Pump Single Phase Energization.

Powertrain > Engine > Active Test

Tester Display
Fuel Pump Single Phase Energization

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

Standard Resistance

Tester Connection	Techstream Operation	Specified Condition
S49-2 (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

Result:

REPLACE FUEL PUMP CONTROL ECU ASSEMBLY

w/o Rear No. 2 Seat: Refer to REMOVAL [09/2015 - ]
w/ Rear No. 2 Seat: Refer to REMOVAL [12/2017 - 08/2019]

Result:

See step 11

CHECK HARNESS AND CONNECTOR (FUEL PUMP CONTROL ECU ASSEMBLY - ECM)

Disconnect the fuel pump control ECU assembly connector.
Disconnect the ECM connector.

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

Standard Resistance

Tester Connection	Condition	Specified Condition
S49-2 (FPC) - A37-18 (FPC)	Always	Below 1 Ω
S49-2 (FPC) or A37-18 (FPC) - Body ground and other terminals	Always	10 kΩ or higher

Result

Proceed to
OK
NG

Result:

REPLACE ECM. Refer to REMOVAL [08/2016 - 08/2019]

Result:

REPAIR OR REPLACE HARNESS OR CONNECTOR

CHECK HARNESS AND CONNECTOR (FUEL PUMP CONTROL ECU ASSEMBLY - BODY GROUND)

Disconnect the fuel pump control ECU assembly connector.

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

Standard Resistance

Tester Connection	Condition	Specified Condition
S49-3 (GND) - Body ground	Always	Below 1 Ω

Result

Proceed to
OK
NG

Result:

REPAIR OR REPLACE HARNESS OR CONNECTOR

Result:

See step 13

CHECK HARNESS AND CONNECTOR (POWER SOURCE VOLTAGE OF FUEL PMP RELAY)

Remove the FUEL PMP relay from the engine room relay block and junction block assembly.

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

Standard Voltage

Tester Connection	Condition	Specified Condition
5 (FUEL PMP relay) - Body ground	Always	11 to 14 V

Result

Proceed to
OK
NG

Result:

REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - FUEL PMP RELAY)

Result:

See step 14

INSPECT FUEL PMP RELAY

Inspect the FUEL PMP relay.

Refer to ON-VEHICLE INSPECTION [09/2015 - ]

Result

Proceed to
OK
NG

Result:

REPLACE FUEL PMP RELAY

Result:

See step 15

CHECK HARNESS AND CONNECTOR (SEMICONDUCTOR PWR INTEGRATION ECU - ECM)

Disconnect the semiconductor PWR integration 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
1G-6 - A37-46 (MREL)	Always	Below 1 Ω
1G-6 or A37-46 (MREL) - Body ground and other terminals	Always	10 kΩ or higher

Result

Proceed to
OK
NG

Result:

REPAIR OR REPLACE HARNESS OR CONNECTOR

Result:

See step 16

CHECK HARNESS AND CONNECTOR (SEMICONDUCTOR PWR INTEGRATION ECU - FUEL PMP RELAY)

Remove the FUEL PMP relay from the engine room relay block and junction block assembly.
Disconnect the semiconductor PWR integration ECU connector.

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

Standard Resistance

Tester Connection	Condition	Specified Condition
1G-8 - 1 (FUEL PMP relay)	Always	Below 1 Ω
1G-8 or 1 (FUEL PMP relay) - Body ground and other terminals	Always	10 kΩ or higher

Result

Proceed to
OK
NG

Result:

REPAIR OR REPLACE HARNESS OR CONNECTOR

Result:

See step 17

CHECK HARNESS AND CONNECTOR (FUEL PMP RELAY - BODY GROUND)

Remove the FUEL PMP relay from the engine room relay block and junction block assembly.

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

Standard Resistance

Tester Connection	Condition	Specified Condition
2 (FUEL PMP relay) - Body ground	Always	Below 1 Ω

Result

Proceed to
OK
NG

Result:

REPAIR OR REPLACE HARNESS OR CONNECTOR

Result:

See step 18

CHECK HARNESS AND CONNECTOR (FUEL PMP RELAY - FUEL PUMP CONTROL ECU ASSEMBLY)

Remove the FUEL PMP relay from the engine room relay block and junction block assembly.
Disconnect the fuel pump control ECU assembly connector.

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

Standard Resistance

Tester Connection	Condition	Specified Condition
3 (FUEL PMP relay) - S49-1 (+B)	Always	Below 1 Ω
3 (FUEL PMP relay) or S49-1 (+B) - Body ground and other terminals	Always	10 kΩ or higher

Result

Proceed to
OK
NG

Result:

GO TO ECM POWER SOURCE CIRCUIT. Refer to ECM Power Source Circuit [09/2015 - ]

Result:

REPAIR OR REPLACE HARNESS OR CONNECTOR