Toyota Tundra. Manual — part 1455

STANDARD RESISTANCE SPECIFICATION

Cylinder Tester Connection Condition Specified Condition

No. 1

C5-2 - Body ground

Always

10 kohms or higher

C5-2 - 1B-8

Always

Below 1 ohms

No. 2

C16-2 - Body ground Always

10 kohms or higher

C16-2 - 1B-8

Always

Below 1 ohms

No. 3

C7-2 - Body ground

Always

10 kohms or higher

C7-2 - 1B-8

Always

Below 1 ohms

No. 4

C14-2 - Body ground Always

10 kohms or higher

C14-2 - 1B-8

Always

Below 1 ohms

No. 5

C9-2 - Body ground

Always

10 kohms or higher

C9-2 - 1B-8

Always

Below 1 ohms

No. 6

C12-2 - Body ground Always

10 kohms or higher

C12-2 - 1B-8

Always

Below 1 ohms

No. 7

C25-2 - Body ground Always

10 kohms or higher

C25-2 - 1B-8

Always

Below 1 ohms

No. 8

C54-2 - Body ground Always

10 kohms or higher

C54-2 - 1B-8

Always

Below 1 ohms

2008 Toyota Tundra

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

Fig. 300: Identifying Fuel Injector Connector & Integration Relay

NG : REPAIR OR REPLACE HARNESS OR CONNECTOR

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

CRANKING HOLDING FUNCTION CIRCUIT

DESCRIPTION

The cranking holding control system provides current to the starter when the ECM detects the ignition switch's
start signal (STSW). When the ECM performs a firing judgment, the system cuts current to the starter. When an
ECM receives the STSW signal, it turns on the ACC Cut relay, which prevents flickering of the combination
meter, clock, audio system, etc. Also, the ECM sends a signal to the ECM's STAR terminal. Then the STAR
output signal travels through the Park/Neutral Position (PNP) switch to the STARTER relay, causing the starter
to activate.

2008 Toyota Tundra

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

When the engine is cranking, the starter operation signal is sent to the ECM's STA terminal.

Fig. 301: STAR Output Signal Graph

WIRING DIAGRAM

2008 Toyota Tundra

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

Fig. 302: Cranking Holding Function - Wiring Diagram

INSPECTION PROCEDURE

1. CHECK CRANKING

a. Check the cranking of the engine.

Result

RESULT REFERENCE

Result

Proceed To

Cranking possible and holding control operates

A

Does not crank

B

Cranking possible but holding control does not operate

C

2008 Toyota Tundra

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