Toyota Tundra. Manual — part 1188

When multiple DTCs for misfiring cylinders are set, but DTC P0300 is not set, it indicates that misfires have
been detected in different cylinders at different times. DTC P0300 is only set when several misfiring cylinders
are detected at the same time.

MONITOR DESCRIPTION

The ECM illuminates the MIL and sets a DTC when either one of the following conditions, which could cause
emission deterioration, is detected (2 trip detection logic).



Within the first 1000 crankshaft revolutions of the engine starting, an excessive misfiring rate
(approximately 20 to 50 misfires per 1000 crankshaft revolutions) occurs once.



An excessive misfiring rate (approximately 20 to 50 misfires per 1,000 crankshaft revolutions) occurs a
total of 4 times.

The ECM flashes the MIL and sets a DTC when either one of the following conditions, which could cause the
Three-Way Catalytic Converter (TWC) damage, is detected (2 trip detection logic).



At a high engine RPM, a catalyst damage misfire, which monitored every 200 crankshaft revolutions,
occurs once.



At a normal engine RPM, a catalyst damage misfire, which monitored every 200 crankshaft revolutions,
occurs 3 times.

HINT:

If a catalyst damage misfire occurs, the ECM informs the driver by flashing the MIL.

MONITOR STRATEGY

MONITOR STRATEGY

P0301
P0302
P0303
P0304
P0305
P0306

Misfiring of specific cylinder occurs and one of following
conditions below is detected (2 trip detection logic):



High temperature misfire occurs in Three-Way Catalytic
Converter (TWC) (MIL blinks)



Emission deterioration misfire occurs (MIL illuminates)

Temperature (ECT)
sensor



Compression pressure



Valve clearance



Valve timing



PCV valve and hose



PCV hose connections



Air induction system



ECM

Related DTCs

P0300: Multiple cylinder misfire
P0301: Cylinder 1 misfire
P0302: Cylinder 2 misfire
P0303: Cylinder 3 misfire
P0304: Cylinder 4 misfire
P0305: Cylinder 5 misfire

2008 Toyota Tundra

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

TYPICAL ENABLING CONDITIONS

Misfire:

TYPICAL ENABLING CONDITIONS

Monitor period of emission-related-misfire:

TYPICAL ENABLING CONDITIONS

Monitor period of catalyst-damaged-misfire (MIL blinks)

TYPICAL ENABLING CONDITIONS

P0306: Cylinder 6 misfire

Required Sensors/Components
(Main)

Crankshaft position sensor and Camshaft position sensor

Required Sensors/Components
(Related)

Engine coolant temperature and intake air temperature sensors and Mass
air flow meter

Frequency of Operation

Continuous

Duration

1000 to 4000 crankshaft revolutions: Emission related misfire 200 to 600
crankshaft revolutions: Catalyst damaged misfire

MIL Operation

2 driving cycles: (MIL illuminates when misfire detected) MIL flashes
immediately: When catalyst damaged misfire occur

Sequence of Operation

None

Monitor runs whenever following DTCs not present

P0102 - P0103 (MAF meter)
P0110 - P0113 (IAT sensor)
P0115 - P0118 (ECT sensor)
P0120 - P0223, P2135 (TP sensor)
P0125 (Insufficient ECT for Closed Loop)
P0327, P0328 (Knock sensor)
P0335 (CKP sensor)
P0340 (VVT sensor)
P0500 (VSS)

Battery voltage

8 V or more

VVT system

Not operated by scan tool

Engine RPM

400 to 5400 RPM

Either of following conditions (a) or (b) met

-

(a) ECT at engine start

More than-7°C (19°F)

(b) ECT

More than 20°C (68°F)

Fuel cut

OFF

First 1000 revolutions after engine start, or Check Mode

Crankshaft 1000 revolutions

Except above

Crankshaft 1000 revolutions x 4

All of following conditions 1, 2 and 3 met

Crankshaft 200 revolutions x 3

2008 Toyota Tundra

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

TYPICAL MALFUNCTION THRESHOLDS

Monitor period of emission-related-misfire:

TYPICAL MALFUNCTION THRESHOLDS

Monitor period of catalyst-damaged-misfire (MIL blinks)

TYPICAL MALFUNCTION THRESHOLDS

MONITOR RESULT

Refer to CHECKING MONITOR STATUS .

WIRING DIAGRAM

Wiring diagram of the ignition system.

1. Driving cycles

1st

2. Check mode

OFF

3. Engine RPM

Less than 2800 RPM

Except above

Crankshaft 200 revolutions

Misfire rate

2% or more

Number of misfire per 200 revolutions

98 or more (varies with intake air amount and RPM)

Paired cylinder misfire (MIL blinks immediately) Detected

2008 Toyota Tundra

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

Fig. 104: Ignition System Wiring Diagram (1 Of 2)

2008 Toyota Tundra

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