Toyota Tundra. Manual — part 1268

TESTER CONNECTION SPECIFIED CONDITION

Standard resistance (Check for short)

TESTER CONNECTION SPECIFIED CONDITION

b. Check the harness and connectors between the integration relay and body ground.

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

Standard resistance (Check for open)

TESTER CONNECTION SPECIFIED CONDITION

NG : REPAIR OR REPLACE HARNESS OR CONNECTOR

Tester Connection

Condition Specified Condition

A24-34 (MREL) - 1B-2 Always

Below 1 ohms

A24-3 (+B) - 1B-4

Always

Below 1 ohms

A24-2 (+B2) - 1B-4

Always

Below 1 ohms

Tester Connection

Condition Specified Condition

A24-34 (MREL) or 1B-2 - Body ground Always

10 kohms or higher

A24-3 (+B) or 1B-4 - Body ground

Always

10 kohms or higher

A24-2 (+B2) or 1B-4 - Body ground

Always

10 kohms or higher

Tester Connection Condition Specified Condition

1B-3 - Body ground Always

Below 1 ohms

2008 Toyota Tundra

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

Fig. 261: Checking Harness & Connector (+B, +B2 & MREL Circuit)

OK : Go to next step.

4. CHECK HARNESS AND CONNECTOR (ECM - BODY GROUND)

a. Disconnect the D74 ECM connector.

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

Standard resistance (Check for open)

TESTER CONNECTION SPECIFIED CONDITION

Tester Connection

Condition Specified Condition

2008 Toyota Tundra

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

NG : REPAIR OR REPLACE HARNESS OR CONNECTOR

Fig. 262: Identifying D74 ECM Connector Terminals

OK : Go to next step.

5. INSPECT ECM (IGSW VOLTAGE)

a. Disconnect the D74 and A24 ECM connectors.

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

Standard voltage

TESTER CONNECTION SPECIFIED CONDITION

NG : Go to step 6

D74-81 (E1) - Body ground Always

Below 1 ohms

Tester Connection

Switch Condition Specified Condition

A24-28 (IGSW) - D74-81 (E1) Ignition switch ON

11 to 14 V

2008 Toyota Tundra

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

Fig. 263: Identifying D74 & A24 ECM Connectors Terminals

OK : REPLACE ECM (See REMOVAL )

6. INSPECT FUSE (IGN)

a. Remove the IGN fuse from the engine room relay block.

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

Standard resistance (Check for open)

TESTER CONNECTION SPECIFIED CONDITION

NG : CHECK FOR SHORT IN ALL HARNESSES AND CONNECTORS CONNECTED TO
FUSE AND REPLACE FUSE

Tester Connection Condition Specified Condition

IGN fuse

Always

Below 1 ohms

2008 Toyota Tundra

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