Toyota Tundra. Manual — part 1451

9. CHECK MIL (CAMSHAFT POSITION SENSOR)

a. Disconnect the D5 camshaft position sensor connector.

b. Turn the ignition switch to ON.

c. Check the MIL.

Result

RESULT REFERENCE

A : REPLACE CAMSHAFT POSITION SENSOR (See REMOVAL )

B : Go to Next Step

10. CHECK HARNESS AND CONNECTOR

a. Disconnect the D9 throttle body connector.

b. Disconnect the A14 accelerator pedal position sensor connector.

c. Disconnect the R1 canister pump module connector.

d. Disconnect the D58 air switching valve connector.

e. Disconnect the D59 air switching valve connector.

f. Disconnect the D46 power steering oil pressure sensor connector.

g. Disconnect the D5 camshaft position sensor connector.

h. Disconnect the A24 and D74 ECM connectors.

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

Standard resistance

STANDARD RESISTANCE SPECIFICATION

Result

Proceed To

MIL illuminates

A

MIL does not illuminate

B

Tester Connection

Condition Specified Condition

D74-80 (VCTA) - Body ground Always

10 kohms or higher

A24-57 (VCPA) - Body ground Always

10 kohms or higher

A24-59 (VCP2) - Body ground

Always

10 kohms or higher

D74-66 (VC) - Body ground

Always

10 kohms or higher

2008 Toyota Tundra

2008 ENGINE PERFORMANCE Engine Control System (2UZ-FE) - Tundra

Fig. 287: Identifying A24 & D74 ECM Connectors

NG : REPAIR OR REPLACE HARNESS OR CONNECTOR

OK : REPLACE ECM (See REMOVAL )

FUEL PUMP CONTROL CIRCUIT

DESCRIPTION

The fuel pump circuit consists of the ECM, fuel pump and fuel pump ECU (which operates the fuel pump).
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 ECU. Based on the signal sent from the ECM, the fuel pump ECU adjusts the
fuel pump operation speed between 3 settings.

WIRING DIAGRAM

2008 Toyota Tundra

2008 ENGINE PERFORMANCE Engine Control System (2UZ-FE) - Tundra

Fig. 288: Fuel Pump Control - Wiring Diagram

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. (See PROBLEM SYMPTOMS TABLE ).

1. 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 fuel pump using the Techstream.

OK: Operating sounds can be heard from fuel pump.

2008 Toyota Tundra

2008 ENGINE PERFORMANCE Engine Control System (2UZ-FE) - Tundra

NG : Go to step 5

OK : Go to Next Step

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

a. Disconnect the R7 fuel pump ECU connector.

b. Disconnect the A24 ECM connector.

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

Standard resistance

STANDARD RESISTANCE SPECIFICATION

Fig. 289: Identifying A24 ECM & R7 Fuel Pump ECU Connectors

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 higher

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

Always

10 kohms or higher

2008 Toyota Tundra

2008 ENGINE PERFORMANCE Engine Control System (2UZ-FE) - Tundra