Toyota Tundra. Manual — part 1185

Fig. 94: Identifying R7 Fuel Pump ECU & A24 ECM Connector Terminals

OK : Go to next step

4. INSPECT FUEL PUMP ECU (FPC SIGNAL)

a. Disconnect the R7 fuel pump ECU connector.

b. Engine cranking.

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

Standard voltage

TESTER CONNECTION SPECIFIED CONDITION

NG : REPLACE ECM (See REMOVAL )

Tester Connection

Condition

Specified Condition

R7-1 (FPC) - R7-3 (E) Engine cranking

2.8 V or higher

2008 Toyota Tundra

2008 ENGINE PERFORMANCE Engine Control System (1GR-FE) - Tundra

Fig. 95: Identifying R7 Fuel Pump ECU Connector Terminals

OK : Go to next step

5. REPLACE FUEL PUMP ECU

a. Replace the fuel pump ECU. (See FUEL PUMP ECU ).

6. 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 ON.

d. Turn the Techstream ON.

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

f. Start the engine and idle it for 5 minutes.

g. Drive the vehicle in an urban area for approximately 10 minutes.

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

i. Read the DTCs.

Result

RESULT CHART

B : GO TO DTC CHART (See DIAGNOSTIC TROUBLE CODE CHART )

A : END

7. INSPECT CIRCUIT OPENING RELAY (C/OPN)

Display (DTC Output) Proceed To

No output

A

Other DTCs

B

2008 Toyota Tundra

2008 ENGINE PERFORMANCE Engine Control System (1GR-FE) - Tundra

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

INSPECTION ).

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

Standard resistance

RESISTANCE SPECIFICATION

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

Fig. 96: Inspecting Circuit Opening Relay (C/OPN)

OK : Go to next step

8. INSPECT CIRCUIT OPENING RELAY (C/OPN) (POWER SOURCE VOLTAGE)

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

INSPECTION ).

b. Turn the ignition switch ON.

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

Standard voltage

TESTER CONNECTION SPECIFIED CONDITION

NG : Go to step 16

Standard resistance

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

Tester Connection

Switch Condition Specified Condition

C/OPN relay (2) - Body ground Ignition switch ON

11 to 14 V

C/OPN relay (5) - Body ground Ignition switch ON

11 to 14 V

2008 Toyota Tundra

2008 ENGINE PERFORMANCE Engine Control System (1GR-FE) - Tundra

Fig. 97: Identifying Circuit Opening Relay (C/OPN)

OK : Go to next step

9. CHECK HARNESS AND CONNECTOR (C/OPN RELAY - ECM, FUEL PUMP ECU)

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

INSPECTION ).

b. Disconnect the R7 fuel pump ECU connector.

c. Disconnect the A24 ECM connector.

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

Standard resistance (Check for open)

TESTER CONNECTION SPECIFIED CONDITION

Standard resistance (Check for short)

TESTER CONNECTION SPECIFIED CONDITION

Tester Connection

Condition Specified Condition

C/OPN relay (1) - A24-48 (FC) Always

Below 1 ohms

C/OPN relay (3) - R7-4 (+B)

Always

Below 1 ohms

Tester Connection

Condition Specified Condition

C/OPN relay (1) or A24-48 (FC) - Body ground Always

10 kohms or higher

C/OPN relay (3) or R7-4 (+B) - Body ground

Always

10 kohms or higher

2008 Toyota Tundra

2008 ENGINE PERFORMANCE Engine Control System (1GR-FE) - Tundra