Toyota Tundra. Manual — part 1336

COMPONENT OPERATING RANGE

WIRING DIAGRAM

Refer to DTC P0136 .

CONFIRMATION DRIVING PATTERN

These DTCs are detected when the engine idles for 110 seconds or more.

INSPECTION PROCEDURE

HINT:

Sensor 2 refers to the sensor mounted behind the Three-Way Catalytic Converter (TWC) and located far from
the engine assembly.

Read freeze frame data using the Techstream. Freeze frame data records the engine condition when
malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was
moving or stationary, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data
from the time the malfunction occurred.

1. INSPECT HEATED OXYGEN SENSOR (HEATER RESISTANCE)

a. Disconnect the D31 or D32 HO2 sensor connector.

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

Standard resistance

STANDARD RESISTANCE SPECIFICATION

Heated Oxygen (HO2) sensor
heater current

0.4 to 1A (when engine idles, HO2 sensor warmed up and battery
voltage 11 to 14 V)

Tester Connection Condition Specified Condition

1 (HT1B) - 2 (+B) 20°C (68°F)

11 to 16 ohms

1 (HT1B) - 4 (E1)

Always

10 kohms or higher

1 (HT2B) - 2 (+B) 20°C (68°F)

11 to 16 ohms

1 (HT2B) - 4 (E1)

Always

10 kohms or higher

2008 Toyota Tundra

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

Fig. 50: Identifying HO2 Sensor Connector

NG : REPLACE HEATED OXYGEN SENSOR (See REMOVAL )

OK : Go To Next Step

2. CHECK TERMINAL VOLTAGE (+B OF HO2 SENSOR)

a. Disconnect the D31 or D32 HO2 sensor connector.

b. Turn the ignition switch to ON.

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

Standard voltage

STANDARD VOLTAGE SPECIFICATION

Result

RESULT REFERENCE

Tester Connection

Switch Condition Specified Condition

D31-2 (+B) - Body ground Ignition switch ON

11 to 14 V

D32-2 (+B) - Body ground Ignition switch ON

11 to 14 V

Result Proceed To

NG

A

OK

B

2008 Toyota Tundra

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

Fig. 51: Identifying D31 Or D32 HO2 Sensor Connectors

B : Go to step 5

A : Go To Next Step

3. INSPECT INTEGRATION RELAY (EFI MAIN)

a. Remove the integration relay from the engine room relay block.

b. Inspect the EFI NO. 1 fuse.

1. Remove the EFI NO. 1 fuse from the integration relay.

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

Standard resistance

STANDARD RESISTANCE SPECIFICATION

3. Reinstall the EFI NO. 1 fuse.

c. Inspect the EFI relay.

Tester Connection Condition Specified Condition

EFI NO. 1 fuse

Always

Below 1 ohms

2008 Toyota Tundra

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

Fig. 52: Identifying Integration Relay Connector Terminal

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

Standard resistance

STANDARD RESISTANCE SPECIFICATION

NG : REPLACE INTEGRATION RELAY (EFI MAIN) (See EFI RELAY )

OK : Go To Next Step

4. CHECK HARNESS AND CONNECTOR (HO2 SENSOR - 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

STANDARD RESISTANCE SPECIFICATION

3. Reinstall the EFI NO. 2 fuse.

b. Disconnect the D31 or D32 HO2 sensor connector.

Tester

Connection

Condition

Specified

Condition

1C-1 - 1B-4

When no battery voltage applied to terminals 1B-2 and
1B-3

10 kohms or higher

When battery voltage applied to terminals 1B-2 and 1B-3

Below 1 ohms

Tester Connection Condition Specified Condition

EFI NO. 2 fuse

Always

Below 1 ohms

2008 Toyota Tundra

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