Toyota Tundra. Manual — part 1189

Fig. 105: Ignition System Wiring Diagram (2 Of 2)

CONFIRMATION DRIVING PATTERN

1. Connect the Techstream to the DLC3.

2. Turn the ignition switch ON.

3. Turn the Techstream ON.

4. Record the DTC (s) and freeze frame data.

5. Using the Techstream, switch the ECM from normal mode to check mode (See CHECK MODE

PROCEDURE ).

6. Read the misfire counts of each cylinder (Cylinder #1 Misfire Rate to Cylinder #6 Misfire Rate) with the

engine in an idling condition. If any misfire count is displayed, skip the following confirmation driving
pattern.

7. Drive the vehicle several times with the conditions, such as engine RPM and engine load, shown in

Misfire RPM and Misfire Load in the Data List.

2008 Toyota Tundra

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

HINT:



In order to store misfire DTCs, it is necessary to operate the vehicle for the period of time shown in
the table below, using the Misfire RPM and Misfire Load in the Data List.

DATA LIST

8. Check whether misfires have occurred by checking DTCs and freeze frame data.

HINT:

Do not turn the ignition switch OFF until the stored DTC (s) and freeze frame data have been recorded.
When the ECM returns to normal mode (default), the stored DTC (s), freeze frame data and other data
will be erased.

9. Record the DTC (s), freeze frame data and misfire counts.

10. Turn the ignition switch OFF and wait for at least 5 seconds.

INSPECTION PROCEDURE

HINT:



If any DTCs other than misfire DTCs are output, troubleshoot those DTCs first.



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.



If the misfire does not recur when the vehicle is brought to the workshop, reproduce the conditions stored
in the ECM as freeze frame data.



If the misfire still cannot be reproduced even though the conditions stored in the ECM as freeze frame
data have been reproduced, one of the following factors is considered to be a possible cause of the
problem:

a. There was insufficient fuel volume in the tank.

b. Improper fuel is used.

c. The spark plugs have been contaminated.



After finishing repairs, check the misfire counts of the cylinders (Cylinder #1 Misfire Rate to Cylinder #6
Misfire Rate).



Be sure to confirm that no misfiring cylinder DTCs are set again by conducting the confirmation driving
pattern after finishing repairs.

Engine RPM

Duration

Idling

3.5 minutes or more

1000

3 minutes or more

2000

1.5 minutes or more

3000

1 minute or more

2008 Toyota Tundra

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



For 6 and 8 cylinder engines, the ECM intentionally does not set the specific misfiring cylinder DTCs at
high engine RPM. If misfires occur only in high engine RPM areas, only DTC P0300 is set.

In the event of DTC P0300 being present, perform the following operations:

a. Clear the DTC (See DTC CHECK/CLEAR ).

b. Start the engine and conduct the confirmation driving pattern.

c. Read the misfiring rates of each cylinder or DTC (s) using the Techstream.

d. Repair the cylinder(s) that has a high misfiring rate or is indicated by the DTC.

e. After finishing repairs, conduct the confirmation driving pattern again, in order to verify that DTC

P0300 is not set.



When one of Short FT #1, Long FT #1, Short FT #2 or Long FT #2 in the freeze frame data is outside the
range of +/-20%, the air-fuel ratio may be Rich (-20% or less) or Lean (+20% or more).



When the Coolant Temp in the freeze frame data is less than 75°C (167°F), the misfire have occurred
only while warming up the engine.



An extremely imbalanced drive wheel can cause body vibration, which may cause misfire DTC (s) to be
stored.

1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO MISFIRE CODES)

a. Connect the Techstream to the DLC3.

b. Turn the ignition switch ON.

c. Turn the Techstream ON.

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

e. Read DTCs.

HINT:

Write down the DTCs.

Result

RESULT CHART

HINT:

If any DTCs other than P0300, P0301, P0302, P0303, P0304, P0305 and P0306 are output,
troubleshoot those DTCs first.

B : GO TO DTC CHART (See DIAGNOSTIC TROUBLE CODE CHART )

Display (DTC Output)

Proceed To

P0300, P0301, P0302, P0303, P0304, P0305 and/or P0306

A

P0300, P0301, P0302, P0303, P0304, P0305 and/or P0306 and other DTCs

B

2008 Toyota Tundra

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

A : Go to next step

2. READ VALUE USING TECHSTREAM (MISFIRE RPM AND MISFIRE LOAD)

a. Connect the Techstream to the DLC3.

b. Turn the ignition switch ON and turn the Techstream ON.

c. Enter the following menus: Powertrain/Engine and ECT/Data List/Misfire/Misfire RPM and

Misfire Load.

d. Read and note the Misfire RPM and Misfire Load values.

HINT:

The Misfire RPM and Misfire Load values indicate the vehicle conditions under which the misfire
occurred.

3. CHECK PCV HOSE CONNECTIONS

OK: PCV hose is correctly connected and is not damaged.

NG : REPAIR OR REPLACE PCV HOSE

OK : Go to next step

4. READ VALUE USING TECHSTREAM

a. Connect the Techstream to the DLC3.

b. Turn the ignition switch ON and turn the Techstream ON.

c. Enter the following menus: Powertrain/Engine and ECT/Data List/Catalyst OT MF F/C.

d. Read the value displayed on the Techstream.

Result

RESULT CHART

B : Go to step 6

A : Go to next step

5. PERFORM ACTIVE TEST USING TECHSTREAM

a. Connect the Techstream to the DLC3.

b. Turn the ignition switch ON and turn the Techstream ON.

c. Enter the following menus: Powertrain/Engine and ECT/Active Test/Prohibit the Catalyst OT

Misfire prevent F/C.

Data List

Tester Display

Proceed To

CAT OT MF F/C (Catalyst OT MF F/C)

AVAIL (Avail)

A

NOT AVL (Not Avl) B

2008 Toyota Tundra

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