Toyota Tundra (2015 year). Manual — part 1311
(a) Remove the fuel pump relay (F/PMP) from the engine room
relay block.
(b) Disconnect the fuel pump ECU connector.
(c) Measure the resistance according to the value(s) in the table
below.
Standard Resistance:
TESTER CONNECTION
CONDITION
SPECIFIED
CONDITION
F/PMP relay (3) - R11-6 (+B)
Always
Below 1 Ω
F/PMP relay (3) or R11-6 (+B) -
Body ground
Always
10 kΩ or higher
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
REPAIR OR REPLACE HARNESS OR CONNECTOR
(FUEL PUMP RELAY - BODY GROUND)
12.
CHECK HARNESS AND CONNECTOR (FUEL PUMP RELAY - INTEGRATION RELAY,
BATTERY AND BODY GROUND)
1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: Fuel Pump Co...
(a) Disconnect the cable from the battery negative (-) terminal.
(b) Disconnect the cable from the battery positive (+) terminal.
(c) Remove the fuel pump relay (F/PMP) from the engine room
relay block.
(d) Remove the integration relay from the engine room relay
block.
(e) Measure the resistance according to the value(s) in the table
below.
Standard Resistance:
TESTER CONNECTION
CONDITION
SPECIFIED
CONDITION
F/PMP relay (1) - 1B-4
Always
Below 1 Ω
F/PMP relay (5) - Battery positive (+)
terminal
Always
Below 1 Ω
F/PMP relay (2) - Body ground
Always
Below 1 Ω
F/PMP relay (1) or 1B-4 - Body
ground
Always
10 kΩ or higher
F/PMP relay (5) or Battery positive
(+) terminal - Body ground
Always
10 kΩ or higher
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
GO TO ECM POWER SOURCE CIRCUIT
13.
PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE FUEL PUMP)
(a) Remove the fuel tank assembly
.
(b) Remove the fuel pump from the fuel tank assembly.
(c) Clean the fuel pump to completely remove any remaining fuel.
(d) Connect the fuel pump connector.
CAUTION:
(e) Connect the Techstream to the DLC3.
(f) Turn the ignition switch to ON.
1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: Fuel Pump Co...
OK
(g) Turn the Techstream on.
(h) Enter the following menus: Powertrain / Engine and ECT /
Active Test / Control the Fuel Pump Duty.
(i) Operate the fuel pump using the active test function and
measure the voltage according to the value(s) in the table
below.
Standard Voltage:
TESTER
CONNECTION
TECHSTREAM
OPERATION
SPECIFIED
CONDITION
1 - 2
FPC Duty: 25%
3.2 to 4.05 V
FPC Duty: 80%
8.8 to 12.5 V
(j) Enter the following menus: Powertrain / Engine and ECT /
Active Test / Control the Fuel Pump/Speed.
(k) Operate the fuel pump using the active test function and
measure the voltage according to the value(s) in the table
below.
Standard Voltage:
TESTER
CONNECTION
TECHSTREAM
OPERATION
SPECIFIED
CONDITION
1 - 2
ON (FPC Duty: 90%)
9.0 to 14.0 V
HINT:
GO TO STEP 16
14.
CHECK HARNESS AND CONNECTOR (FUEL PUMP ECU - ECM)
1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: Fuel Pump Co...
OK
(a) Disconnect the fuel pump 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
R11-5 (FPC) - A24-52 (FPC)
Always
Below 1 Ω
R11-5 (FPC) or A24-52 (FPC) -
Body ground
Always
10 kΩ or higher
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
15.
REPLACE FUEL PUMP
(a) Replace the fuel pump
.
HINT:
Perform "Inspection After Repair" after replacing the fuel pump
.
NEXT
GO TO STEP 17
16.
REPLACE FUEL PUMP ECU
(a) Replace the fuel pump ECU
.
1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: Fuel Pump Co...
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