Monitor Strategy

Total OBD & ECU Auto Diagnostics

TOAD Auto Diagnostics

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Related DTCs

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

Required Sensors/Components (Main)

Injector, Ignition coil, Spark plug

Required Sensors/Components (Related)

Crankshaft, Camshaft, Engine coolant temperature and intake air temperature sensors and Mass air flow meter

Frequency of Operation



1,000 to 4,000 crankshaft revolutions: Emission related misfire 200 to 600 crankshaft revolutions: Catalyst damaged misfire

MIL Operation

2 driving cycles: Emission related misfire

MIL flashes immediately: Catalyst damaged misfire

Sequence of Operation




Monitor runs whenever following DTCs not present

Battery voltage

8 V or more

Throttle position learning


VVT system

Not operated by scan tool

Engine RPM

400 to 5,800 rpm

Both of following conditions A and B met


A. Engine coolant Temperature (ECT)

-10°C (14°F) or more

B. Either of following conditions 1 or 2 met


1. ECT at engine start

More than -7°C (19°F)

2. ECT

More than 20°C (68°F)


Monitor Period of Emission-related-misfire:

Misfire rate

1.538 % or more

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


(a) First 1,000 revolutions after engine start or check mode

Crankshaft 1,000 revolutions

(b) Except above

Crankshaft 1,000 revolutions x 4

Monitor Period of Catalyst-damaged-misfire (MIL blinks):

Number of misfire per 200 revolutions

97.14 or more (varies with intake air amount and engine RPM)

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


(a) All of following conditions A, B and C met

Crankshaft 200 revolutions x 3

A. Driving cycles


B. Check mode


C. Engine RPM

Below 2,200 rpm

(b) Except above

Crankshaft 200 revolutions

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