Toyota Tundra. Manual — part 1548

MONITOR DESCRIPTION

To monitor the fuel pump circuit, the ECM checks the fuel pump control signal (FPC) and diagnostic signal
(Dl). The FPC voltage varies between approximately 0 V to approximately 12 V (duty signal). Based on the
condition of the fuel pump ECU malfunction, the Dl voltage varies between approximately 0 V and
approximately 12 V. The ECM then compares the variance of the FPC voltage and Dl voltage, and determines if
the fuel pump circuit is malfunctioning. When the ECM determines that the fuel pump circuit is malfunctioning,
a DTC is set immediately.

WIRING DIAGRAM

Fig. 109: Fuel Pump - Wiring Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

INSPECTION PROCEDURE

This troubleshooting procedure is based on the premise that the engine is started. If the engine is not started,
proceed to the PROBLEM SYMPTOMS TABLE .

1. CHECK FOR DTC (B1500)

a. Connect the Techstream to the DLC3.

b. Turn the ignition switch to ON.

c. Turn the Techstream ON.

P0230

When either condition below is met
(1 trip detection logic):



When fuel pump is operating:



Remaining fuel is 17 L
or more



Dl terminal output is
low



When fuel pump is not
operating:



Dl terminal output is
high



Open or short in fuel pump
circuit



Fuel pump



Fuel pump ECU



ECM

2009 Toyota Tundra

2009 ENGINE PERFORMANCE Engine Control System (3UR-FBE) - Tundra

d. Enter the following menus: Body Electrical/Combination Meter/Trouble Codes.

e. Read the DTC.

Result

RESULT REFERENCE

B: GO TO DTC B1500 (See DTC B1500 FUEL SENDER OPEN DETECTED )

A: Go to Next Step

2. PERFORM ACTIVE TEST USING TECHSTREAM (FUEL PUMP)

a. Connect the Techstream to the DLC3.

b. Turn the ignition switch to ON and turn the Techstream ON.

c. Enter the following menus: Powertrain/Engine and ECT/Active Test/Control the Fuel Pump/Speed.

d. Check whether operating sounds can be heard while operating the relay using the Techstream.

OK: Operating sounds can be heard from relay.

NG: Go to step 6

OK: Go to Next Step

3. CHECK HARNESS AND CONNECTOR (FUEL PUMP ECU - ECM, BODY GROUND)

a. Disconnect the R7 fuel pump ECU connector.

Fig. 110: Identifying Terminals Of R7 Fuel Pump ECU Connector
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

b. Disconnect the A24 ECM connector.

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

Result

Proceed to

DTC B1500 is not output

A

DTC B1500 is output

B

2009 Toyota Tundra

2009 ENGINE PERFORMANCE Engine Control System (3UR-FBE) - Tundra

Standard resistance

RESISTANCE SPECIFIED CONDITION

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to Next Step

4. REPLACE FUEL PUMP ECU

a. Replace the fuel pump ECU (see REMOVAL ).

5. CONFIRM WHETHER DTC OUTPUT RECURS

a. Check that there is 17 L or more of fuel remaining.

b. Connect the Techstream to the DLC3.

c. Turn the ignition switch to ON.

d. Turn the Techstream ON.

e. Clear DTCs (see DTC CHECK/CLEAR ).

f. Cranking it for 15 seconds.

g. Idle it for 1 minute.

h. Enter the following menus: Powertrain/Engine and ECT/Trouble Codes.

i. Read the DTCs.

Result

RESULT REFERENCE

B: REPLACE ECM (See REMOVAL )

A: END

6. INSPECT CIRCUIT OPENING RELAY (C/OPN)

a. Remove the circuit opening relay (C/OPN) from the engine room relay block (see ON-VEHICLE

INSPECTION ).

Tester Connection

Condition Specified Condition

R7-1 (FPC) - A24-52 (FPC)

Always

Below 1 ohms

R7-2 (DI) - A24-18 (DI)

Always

Below 1 ohms

R7-3 (E) - Body ground

Always

Below 1 ohms

R7-1 (FPC) or A24-52 (FPC) - Body ground Always

10 kohms or more

R7-2 (DI) or A24-18 (DI) - Body ground

Always

10 kohms or more

Result

Proceed to

DTC is not output

A

DTC P0230 is output

B

2009 Toyota Tundra

2009 ENGINE PERFORMANCE Engine Control System (3UR-FBE) - Tundra

Fig. 111: Inspecting Circuit Opening Relay (C/OPN)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

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

Standard resistance

RESISTANCE SPECIFIED CONDITION

NG: REPLACE CIRCUIT OPENING RELAY (C/OPN) (See ON-VEHICLE INSPECTION )

OK: Go to Next Step

7. INSPECT CIRCUIT OPENING RELAY (POWER SOURCE VOLTAGE)

a. Remove the circuit opening relay (C/OPN) from the engine room relay block (see ON-VEHICLE

INSPECTION ).

Fig. 112: Identifying Terminals Of Circuit Opening Relay
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

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

3 - 5

When no battery voltage applied to terminals 1 and 2 10 kohms or higher

3 - 5

When battery voltage applied to terminals 1 and 2

Below 1 ohms

2009 Toyota Tundra

2009 ENGINE PERFORMANCE Engine Control System (3UR-FBE) - Tundra