Toyota Tundra. Manual — part 1158

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

Standard voltage (for Bank 1 sensor 1)

TESTER CONNECTION SPECIFIED CONDITION

Standard voltage (for Bank 2 sensor 1)

TESTER CONNECTION SPECIFIED CONDITION

NG : Go to step 5

Fig. 42: Identifying D33*1 Or D34*2 A/F Sensor Connector Terminals

OK : Go to next step

3. CHECK HARNESS AND CONNECTOR (A/F SENSOR - ECM)

a. Disconnect the D33*1 or D34*2 A/F sensor connector.

b. Disconnect the D74 ECM connector.

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

Standard resistance (Check for open)

TESTER CONNECTION SPECIFIED CONDITION

Tester Connection

Switch Condition Specified Condition

D33-2 (+B) - Body ground Ignition switch ON

11 to 14 V

Tester Connection

Switch Condition Specified Condition

D34-2 (+B) - Body ground Ignition switch ON

11 to 14 V

Tester Connection

Condition Specified Condition

D33-1 (HA1A) - D74-22 (HA1A) Always

Below 1 ohms

2008 Toyota Tundra

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

Standard resistance (Check for short)

TESTER CONNECTION SPECIFIED CONDITION

NG : REPAIR OR REPLACE HARNESS OR CONNECTOR

Fig. 43: Identifying D33*1 Or D34*2 A/F Sensor Connector Terminals

OK : Go to next step

4. CHECK WHETHER DTC OUTPUT RECURS

a. Connect the Techstream to the DLC3.

b. Turn the ignition switch ON.

c. Turn the Techstream ON.

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

D34-1 (HA1A) - D74-20 (HA2A) Always

Below 1 ohms

Tester Connection

Condition Specified Condition

D33-1 (HA1A) or D74-22 (HA1A) - Body ground Always

10 kohms or higher

D34-1 (HA2A) or D74-20 (HA2A) - Body ground Always

10 kohms or higher

2008 Toyota Tundra

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

e. Start the engine.

f. Allow the engine to idle for 1 minute or more.

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

h. Read the DTCs.

Result

RESULT CHART

B : REPLACE ECM (See REMOVAL )

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

5. INSPECT INTEGRATION RELAY (A/F RELAY)

a. Remove the integration relay from the engine room junction block (See ON-VEHICLE

INSPECTION ).

b. Inspect the A/F fuse.

1. Remove the A/F fuse from the integration relay.

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

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION

3. Reinstall the A/F fuse.

c. Inspect the A/F relay.

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

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION

Display (DTC Output)

Proceed To

No output

A

P0031, P0032, P0051 or P0052

B

Tester Connection Condition Specified Condition

A/F fuse

Always

Below 1 ohms

Tester

Connection

Condition

Specified

Condition

1A-4 - 1C-1

When no battery voltage applied to terminals 1A-2

and 1A-3

10 kohms or higher

When battery voltage applied to terminals 1A-2 and

1A-3

Below 1 ohms

2008 Toyota Tundra

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

NG : REPLACE INTEGRATION RELAY (See ON-VEHICLE INSPECTION )

Fig. 44: Identifying Integration Relay Location

OK : Go to next step

6. CHECK HARNESS AND CONNECTOR (A/F SENSOR - A/F SENSOR HEATER RELAY (A/F))

a. Disconnect the D33*1 or D34*2 A/F sensor heater relay (A/F) connector.

HINT:

*1: Bank 1 sensor 1

*2: Bank 2 sensor 1

b. Remove the integration relay from the engine room junction block (See ON-VEHICLE

INSPECTION ).

c. 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

D33-2 (+B) - 1A-4

Always

Below 1 ohms

D34-2 (+B) - 1A-4

Always

Below 1 ohms

Tester Connection

Condition Specified Condition

2008 Toyota Tundra

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