Toyota Tundra (2015 year). Manual — part 1539
sensor. The CMP sensor is used to identify any misfiring cylinders and the CKP sensor is used to measure
variations in the crankshaft rotation speed. Misfires are counted as when the crankshaft rotation speed
variations exceed predetermined thresholds.
If the misfire rate exceeds the threshold level, the ECM illuminates the MIL and stores a DTC.
DTC
NO.
DTC DETECTION CONDITION
TROUBLE AREA
P0300
logic):
Misfire occurs that may damage the three-way
catalytic converter (MIL blinks when detect
immediately).
Catalyst deterioration misfire occurs (MIL
illuminates).
Open or short in engine
wire harness
Connector connection
Vacuum hose
connections
Ignition system
Fuel injector
Fuel pressure
Mass Air Flow (MAF)
meter
Engine Coolant
Temperature (ECT)
sensor
Compression pressure
Valve timing
PCV valve and hose
PCV hose connections
Air induction system
ECM
Fuel pressure switching
valve
Fuel pressure regulator
Fuel pressure regulator
for high pressure
P0301
P0302
P0303
P0304
P0305
P0306
P0307
P0308
Misfire occurs that may damage the three-way
catalytic converter (MIL blinks when detect
immediately).
Catalyst deterioration misfire occurs (MIL
illuminates).
When multiple DTCs for misfiring cylinders are set, but DTC P0300 is not stored, it indicates that misfires have
been detected in different cylinders at different times. DTC P0300 is only stored when several misfiring
cylinders are detected at the same time.
MONITOR DESCRIPTION
An excessive misfiring rate (approximately 10 to 50 misfires per 1000 crankshaft revolutions)
the following conditions, which could cause the Three-Way Catalytic Converter (TWC) damage, is detected:
At a high engine speed, a catalyst damage misfire, which monitored every 200 crankshaft
revolutions, occurs once.
At a normal engine speed, 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.
3UR-FBE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0300-P030...
MONITOR STRATEGY
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
P0306: Cylinder 6 misfire
P0307: Cylinder 7 misfire
P0308: Cylinder 8 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
Duration
1000 crankshaft revolutions (soon after engine is started: 1 time, other 4
times) (Emissions-related misfire)
200 crankshaft revolutions (1 or 3 times) (Catalyst-damaging misfire)
MIL Operation
2 driving cycles: MIL illuminates when misfire detect
MIL flashes immediately: When catalyst damaged misfire occur
TYPICAL ENABLING CONDITIONS
Misfire:
Monitor runs whenever following DTCs
not stored
P0016, P0018 (VVT System - Misalignment)
P0017, P0019 (Exhaust VVT System - Misalignment)
P0102, P0103 (Mass Air Flow Meter)
P0112, P0113 (Intake Air Temperature Sensor)
P0115, P0117, P0118 (Engine Coolant Temperature Sensor)
P0125 (Insufficient Coolant Temperature for Closed Loop Fuel
Control)
P0120, P0121, P0122, P0123, P0220, P0222, P0223, P2135
(Throttle Position Sensor)
P0327, P0328, P0332, P0333, P032C, P032D, P033C, P033D (Knock
Sensor)
P0335 (Crankshaft Position Sensor)
P1340 (Camshaft Position Sensor)
P0351 - P0358 (Igniter)
P0500 (Vehicle Speed Sensor)
P0705 (Shift Lever Position Switch)
Battery voltage
8 V or more
VVT system
Not operated by scan tool
Engine speed
400 to 5900 rpm
-
(a) ECT at engine start
More than -7°C (19°F)
3UR-FBE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0300-P030...
(b) ECT
More than 20°C (68°F)
Fuel cut
OFF
Crankshaft 1000 revolutions
Except above
Crankshaft 1000 revolutions x 4
Crankshaft 200 revolutions x 3
1. Driving cycles
1st
2. Check mode
OFF
3. Engine speed
Less than 2800 rpm
4. Engine load
Below 80%
Except above
Crankshaft 200 revolutions
TYPICAL MALFUNCTION THRESHOLDS
1.5% or more
103 or more (varies with intake air amount and RPM)
MONITOR RESULT
Refer to CHECKING MONITOR STATUS
.
WIRING DIAGRAM
3UR-FBE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0300-P030...
3UR-FBE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0300-P030...
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