Toyota Tundra. Manual — part 1524

B: Go to step 6

C: CHECK FOR INTERMITTENT PROBLEMS (See CHECK FOR INTERMITTENT
PROBLEMS )

A: Go to next step.

2. INSPECT MASS AIR FLOW METER (POWER SOURCE VOLTAGE)

a. Disconnect the D7 MAF meter connector.

Fig. 66: Identifying Terminals Of D7 MAF Meter Connector
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

VOLTAGE SPECIFIED CONDITION

NG: Go to step 5

OK: Go to next step.

3. INSPECT MASS AIR FLOW METER

a. Remove the Mass Air Flow (MAF) meter (see REMOVAL ).

b. Inspect the MAF meter.

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

OK

VOLTAGE SPECIFIED CONDITION

Tester Connection

Switch Condition Specified Condition

D7-1 (+B) - Body ground Ignition switch ON

11 to 14 V

Tester

Condition

Specified

2009 Toyota Tundra

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

Fig. 67: Measuring Voltage Between Mass Air Flow Meter Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

NG: REPLACE MASS AIR FLOW METER (See REMOVAL )

OK: Go to next step.

4. CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER - ECM)

a. Disconnect the D7 MAF meter connector.

Fig. 68: Identifying Terminals Of D7 MAF And D74 ECM Meter Connectors
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

b. Disconnect the D74 ECM connector.

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

Connection

Condition

2 (E2G) - 3 (VG)



When battery voltage applied to terminals 1
(+B) - 2 (E2G)



Air blown into the MAF meter

Voltage fluctuates

NOTE:

While using the battery during inspection, do not bring the
positive and negative tester probes too close to each other as a
short circuit may occur.

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: REPLACE ECM (See REMOVAL )

5. CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER - INTEGRATION

RELAY)

a. Check the EFI NO. 2 fuse.

1. Remove the EFI NO. 2 fuse from the engine room relay block.

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

Standard resistance

RESISTANCE SPECIFIED CONDITION

3. Reinstall the EFI NO. 2 fuse.

b. Disconnect the D7 MAF meter connector.

Tester Connection

Condition Specified Condition

D7-3 (VG) - D74-74 (VG)

Always

Below 1 ohms

D7-2 (E2G) - D74-75 (E2G)

Always

Below 1 ohms

D7-3 (VG) or D74-74 (VG) - Body ground Always

10 kohms or higher

Tester Connection Condition Specified Condition

EFI NO. 2 fuse

Always

Below 1 ohms

2009 Toyota Tundra

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

Fig. 69: Identifying Terminals Of D7 MAF Meter Connector
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

c. Remove the integration relay from the engine room relay block (see ON-VEHICLE

INSPECTION ).

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

Standard resistance

RESISTANCE SPECIFIED CONDITION

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: CHECK ECM POWER SOURCE CIRCUIT (See ECM POWER SOURCE CIRCUIT )

6. CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER - ECM)

a. Disconnect the D7 MAF meter connector.

Tester Connection

Condition Specified Condition

D7-1 (+B) - 1B-4

Always

Below 1 ohms

D7-1 (+B) or 1B-4 - Body ground Always

10 kohms or higher

2009 Toyota Tundra

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