Toyota Tundra. Manual — part 1190

d. Perform the Active Test.

6. READ VALUE USING TECHSTREAM

a. Enter the following menus: Powertrain/Engine and ECT/Data List/Misfire/Cylinder #1 Misfire

Rate, #2, #3, #4, #5 and #6.

b. Read each value for Cylinder #1 Misfire Rate to #6 displayed on the Techstream. If no misfire

counts occur in any cylinders, perform the following procedures:

1. Start the engine and let it idle.

2. Move the shift lever to the D position.

3. Check the Cylinder #1 Misfire Rate to #6.

4. If misfire counts are still not displayed, perform steps (c) and (d).

c. Drive the vehicle with the Misfire RPM and Misfire Load noted in the "Read value using

Techstream (Misfire RPM and Misfire Load)" procedures above.

d. Read the Cylinder #1 Misfire Rate to #6 or DTCs displayed on the Techstream.

Result

RESULT CHART

HINT:



If it is difficult to reproduce misfires for each cylinder, check the Data List item called
Misfire Margin. Try to find vehicle driving conditions that lower the Misfire Margin value.
Values above 30% are considered normal.



If the freeze frame data's record of the ECT is below 75°C (167°F), the misfire may be
detected only when the engine is cold.



If the freeze frame data's record of the Engine Run Time is below 120 seconds, the misfire
may be detected immediately after the engine is started.

B : Go to step 19

A : Go to next step

7. CHECK SPARK PLUG

a. Remove the ignition coil and the spark plug of the misfiring cylinder.

b. Measure the spark plug electrode gap.

NOTE:

When performing the Active Test, make sure the vehicle is stopped
and either idling or being revved within 3000 RPM.

Misfire Count

Proceed To

Most misfires occur in only 1 or 2 cylinders

A

3 cylinders or more have equal misfire counts

B

2008 Toyota Tundra

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

Maximum gap:

1.3 mm (0.0512 in.)

c. Check the electrode for carbon deposits.

Recommended spark plug:

SPARK PLUG SPECIFICATION

NG : REPLACE SPARK PLUG . (See IGNITION COIL AND SPARK PLUG ).

Fig. 106: Checking Spark Plug Electrode Gap

OK : Go to next step

8. CHECK FOR SPARKS AND IGNITION

a. Disconnect the injector connectors to prevent the engine from starting.

b. Remove the ignition coil from the cylinder head.

c. Install the spark plug onto the ignition coil.

d. Attach the spark plug assembly to the cylinder head.

e. Crank the engine for less than 2 seconds and check the spark.

OK: Sparks jump across electrode gap.

Manufacturer Product

DENSO

FK20HR11

NOTE:

If the electrode gap is larger than standard, replace the spark plug.
Do not adjust the electrode gap.

CAUTION: Always disconnect all injector connectors.

NOTE:

Do not crank the engine for more than 2 seconds.

2008 Toyota Tundra

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

f. Install the ignition coil.

g. Reconnect the injector connectors.

NG : Go to step 31

OK : Go to next step

9. CHECK CYLINDER COMPRESSION PRESSURE

a. Measure the cylinder compression pressure of the misfiring cylinder (See ON-VEHICLE

INSPECTION ).

NG : CHECK ENGINE TO DETERMINE CAUSE OF LOW COMPRESSION

OK : Go to next step

10. CHECK HARNESS AND CONNECTOR (ECM - INJECTOR)

a. Disconnect the injector connector (of the misfiring cylinder).

b. Disconnect the D74 ECM connector.

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

Standard voltage

TESTER CONNECTION SPECIFIED CONDITION

Cylinder Tester Connection Switch Condition Specified Condition

No. 1

D11-1 - Body ground Ignition switch ON

11 to 14 V

No. 2

D26-1 - Body ground Ignition switch ON

11 to 14 V

No. 3

D13-1 - Body ground Ignition switch ON

11 to 14 V

No. 4

D24-1 - Body ground Ignition switch ON

11 to 14 V

No. 5

D15-1 - Body ground Ignition switch ON

11 to 14 V

No. 6

D22-1 - Body ground Ignition switch ON

11 to 14 V

2008 Toyota Tundra

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

Fig. 107: Identifying Injector Connector Terminals

d. Measure the voltage and resistance according to the value(s) in the table below.

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION

NG : REPAIR OR REPLACE HARNESS OR CONNECTOR

OK : Go to next step

Cylinder

Tester Connection

Condition Specified Condition

No. 1

D11-2 - Body ground

Always

10 kohms or higher

D11-2 - D74-86 (#10)

Always

Below 1 ohms

No. 2

D26-2 - Body ground

Always

10 kohms or higher

D26-2 - D74-109 (#20) Always

Below 1 ohms

No. 3

D13-2 - Body ground

Always

10 kohms or higher

D13-2 - D74-85 (#30)

Always

Below 1 ohms

No. 4

D24-2 - Body ground

Always

10 kohms or higher

D24-2 - D74-108 (#40) Always

Below 1 ohms

No. 5

D15-2 - Body ground

Always

10 kohms or higher

D15-2 - D74-84 (#50)

Always

Below 1 ohms

No. 6

D22-2 - Body ground

Always

10 kohms or higher

D22-2-D74-107 (#60)

Always

Below 1 ohms

2008 Toyota Tundra

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