Toyota Tundra. Manual — part 1374

Fig. 131: Identifying D74 ECM & D36 Or D38 VVT Sensor Connector

NG : REPAIR OR REPLACE HARNESS OR CONNECTOR

OK : Go To Next Step

3. CHECK SENSOR INSTALLATION (VVT SENSOR)

a. Check the VVT sensor installation.

OK: Sensor is installed correctly.

Fig. 132: Identifying VVT Sensor Installation Position

2008 Toyota Tundra

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

NG : SECURELY REINSTALL SENSOR (See INSTALLATION )

OK : Go To Next Step

4. CHECK CAMSHAFT (TEETH)

a. Remove the cylinder head cover (see REMOVAL ).

b. Check the tooth of the camshaft.

OK: The camshaft does not have any cracks or deformation.

NG : REPLACE CAMSHAFT (See REMOVAL )

OK : Go To Next Step

5. REPLACE VVT SENSOR

a. Replace the VVT sensor (see REMOVAL ).

6. CHECK WHETHER DTC OUTPUT RECURS

a. Connect the Techstream to the DLC3.

b. Turn the ignition switch to ON.

c. Turn the Techstream ON.

d. Clear DTCs.

e. Start the engine.

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

g. Read DTCs.

Result

RESULT REFERENCE

HINT:

If the engine does not start, replace the ECM.

B : REPLACE ECM (See REMOVAL )

A : END

DTC P0351 IGNITION COIL "A" PRIMARY/SECONDARY CIRCUIT; DTC P0352 IGNITION COIL
"B" PRIMARY/SECONDARY CIRCUIT; DTC P0353 IGNITION COIL "C"
PRIMARY/SECONDARY CIRCUIT; DTC P0354 IGNITION COIL "D" PRIMARY/SECONDARY
CIRCUIT; DTC P0355 IGNITION COIL "E" PRIMARY/SECONDARY CIRCUIT; DTC P0356

Result

Proceed To

No DTC is output

A

P0340 or P0345 is output

B

2008 Toyota Tundra

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

IGNITION COIL "F" PRIMARY/SECONDARY CIRCUIT; DTC P0357 IGNITION COIL "G"
PRIMARY/SECONDARY CIRCUIT; DTC P0358 IGNITION COIL "H" PRIMARY/SECONDARY
CIRCUIT

DESCRIPTION

HINT:



These DTCs indicate malfunctions relating to the primary circuit.



If DTC P0351 is set, check the No. 1 ignition coil with igniter circuit.



If DTC P0352 is set, check the No. 2 ignition coil with igniter circuit.



If DTC P0353 is set, check the No. 3 ignition coil with igniter circuit.



If DTC P0354 is set, check the No. 4 ignition coil with igniter circuit.



If DTC P0355 is set, check the No. 5 ignition coil with igniter circuit.



If DTC P0356 is set, check the No. 6 ignition coil with igniter circuit.



If DTC P0357 is set, check the No. 7 ignition coil with igniter circuit.



If DTC P0358 is set, check the No. 8 ignition coil with igniter circuit.

A Direct Ignition System (DIS) is used on this vehicle.

The DIS is a 1-cylinder ignition system in which each cylinder is ignited by one ignition coil and one spark plug
is connected to the end of each secondary wiring. A powerful voltage, generated in the secondary wiring, is
applied directly to each spark plug. The sparks of the spark plugs pass from the center electrode to the ground
electrodes.

The ECM determines the ignition timing and transmits the ignition (IGT) signals to each cylinder. Using the
IGT signal, the ECM turns the power transistor inside the igniter on and off. The power transistor, in turn,
switches on and off the current to the primary coil. When the current to the primary coil is cut off, a powerful
voltage is generated in the secondary coil. This voltage is applied to the spark plugs, causing them to spark
inside the cylinders. As the ECM cuts the current to the primary coil, the igniter sends back an ignition
confirmation (IGF) signal to the ECM for each cylinder ignition.

2008 Toyota Tundra

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

Fig. 133: Ignition Coil "A" Primary / Secondary Circuit - System Diagram

DTC DETECTION CONDITION AND TROUBLE AREA

DTC

Code

DTC Detection Condition

Trouble Area

P0351
P0352
P0353



Ignition system



Open or short in IGF1 or IGT circuit (1 to 8)

2008 Toyota Tundra

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