Toyota Tundra. Manual — part 1127

1. VEHICLE BROUGHT TO WORKSHOP

2. CUSTOMER PROBLEM ANALYSIS

3. CONNECT TECHSTREAM TO DLC3

HINT:

If the display indicates a communication fault in the Techstream, inspect the DLC3.

4. CHECK DTC AND FREEZE FRAME DATA*

HINT:

Record or print DTCs and freeze frame data, if necessary.

5. CLEAR DTC AND FREEZE FRAME DATA*

6. CONDUCT VISUAL INSPECTION

7. SET CHECK MODE DIAGNOSIS* (see CHECK MODE PROCEDURE )

8. CONFIRM PROBLEM SYMPTOMS

HINT:

If the engine does not start, first perform the "CHECK DTC" procedures and "CONDUCT BASIC
INSPECTION" procedures below.

RESULT CHART

B : GO TO STEP 10

A : Go to next step

9. SIMULATE SYMPTOMS

10. CHECK DTC (see DTC CHECK/CLEAR )

RESULT CHART

B : GO TO STEP 12

A : Go to next step

Result

Proceed To

Malfunction does not occur

A

Malfunction occurs

B

Result

Proceed To

Malfunction code

A

No code

B

2008 Toyota Tundra

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

11. REFER TO DTC CHART (see DIAGNOSTIC TROUBLE CODE CHART )

12. CONDUCT BASIC INSPECTION (see CHECK FOR INTERMITTENT PROBLEMS )

RESULT CHART

B : GO TO STEP 17

A : Go to next step

13. REFER TO PROBLEM SYMPTOMS TABLE

RESULT CHART

B : GO TO STEP 17

A : Go to next step

14. CHECK ECM POWER SOURCE CIRCUIT (see ECM POWER SOURCE CIRCUIT )

15. CONDUCT CIRCUIT INSPECTION

RESULT CHART

B : GO TO STEP 18

A : Go to next step

16. CHECK FOR INTERMITTENT PROBLEMS (see CHECK FOR INTERMITTENT

PROBLEMS )

17. CONDUCT PARTS INSPECTION

18. IDENTIFY PROBLEM

19. ADJUST AND/OR REPAIR

20. CONDUCT CONFIRMATION TEST

NEXT : END

Result

Proceed To

Malfunctioning parts not confirmed

A

Malfunctioning parts confirmed

B

Result

Proceed To

Malfunctioning circuit confirmed

A

Malfunctioning parts confirmed

B

Result

Proceed To

Malfunction not confirmed

A

Malfunction confirmed

B

2008 Toyota Tundra

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

CHECK FOR INTERMITTENT PROBLEMS

HINT:

Inspect the vehicle's ECM using check mode. Intermittent problems are easier to detect with the Techstream
when the ECM is in check mode. In check mode, the ECM uses 1 trip detection logic, which is more sensitive
to malfunctions than normal mode (default), which uses 2 trip detection logic.

1. Clear the DTCs (See DTC CHECK/CLEAR ).

2. Switch the ECM from normal mode to check mode using the Techstream (See CHECK MODE

PROCEDURE ).

3. Perform a simulation test.

4. Check and wiggle the harness(es), connector(s) and terminal(s).

BASIC INSPECTION

When a malfunction is not confirmed by the DTC check, troubleshooting should be carried out in all circuits
considered to be possible causes of the problem. In many cases, by carrying out the basic engine check shown
in the following flowchart, the location of the problem can be found quickly and efficiently. Therefore, using
this check is essential when engine troubleshooting.

1. CHECK BATTERY VOLTAGE

Result

RESULT CHART

NG : CHARGE OR REPLACE BATTERY

OK : Go to next step

2. CHECK WHETHER ENGINE CRANKS

NG : PROCEED TO PROBLEM SYMPTOMS TABLE

OK : Go to next step

3. CHECK WHETHER ENGINE STARTS

NG : GO TO STEP 6

NOTE:

Carry out this check with the engine stopped and the ignition switch OFF.

Result

Proceed To

11 V or more

OK

Below 11 V

NG

2008 Toyota Tundra

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

OK : Go to next step

4. CHECK AIR FILTER

a. Visually check that the air filter is not excessively contaminated with dirt or oil.

NG : REPLACE AIR FILTER

OK : Go to next step

5. CHECK IDLING SPEED

NG : TROUBLESHOOT IDLING SPEED AND PROCEED TO NEXT STEP

OK : Go to next step

6. CHECK FUEL PRESSURE

NG : TROUBLESHOOT FUEL PRESSURE AND PROCEED TO NEXT STEP

OK : Go to next step

7. CHECK FOR SPARK

NG : TROUBLESHOOT SPARK AND PROCEED TO NEXT STEP

OK : PROCEED TO PROBLEM SYMPTOMS TABLE

REGISTRATION

HINT:

The VIN is in the form of a 17-digit alphanumeric vehicle identification number. The Techstream is required to
register the VIN.

1. DESCRIPTION

HINT:

This registration section consists of two parts: Read VIN and Write VIN.

a. Read VIN: Explains the VIN reading process in a flowchart. This process allows the VIN stored in

the ECM to be read in order to confirm that the two VINs, provided with the vehicle and stored in
the vehicle's ECM, are the same.

NOTE:

The Vehicle Identification Number (VIN) must be input into the replacement
ECM.

2008 Toyota Tundra

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