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DI-672
DIAGNOSTICS - ENGINE (2UZ-FE)
DIDRN-01
DTC P0420 Catalyst System Efficiency Below Threshold
(Bank 1)
DTC P0430 Catalyst System Efficiency Below Threshold
(Bank 2)
MONITOR DESCRIPTION
The ECM uses the two sensors, mounted in front of and behind the Three-way Catalytic Converter (TWC),
to monitor its efficiency.
The first sensor, the Air-Fuel Ratio (A/F) sensor (sensor 1), sends pre-catalyst information to the ECM. The
second sensor, the Heated Oxygen (HO2) sensor (sensor 2), sends post-catalyst information to the ECM.
The ECM compares the information transmitted by these two sensors to determine the efficiency of the TWC
performance and its ability to store oxygen.
When the TWC is functioning properly, the variation in the oxygen concentration in the exhaust gas, after
it has passed through the TWC, is small. In this condition, the voltage output of sensor 2 slowly alternates
between the rich and lean signal voltages (shown in the illustration below). As the TWC performance efficien-
cy deteriorates, its oxygen storage capacity decreases, and the variation in the oxygen concentration in the
exhaust gas increases. As a result, the sensor voltage output fluctuates frequently.
While the catalyst monitor is running, the ECM measures the signal lengths of both sensors 1 and 2, and
calculates the ratio of the signal lengths to determine the extent of the TWC deterioration. If the deterioration
level exceeds the preset threshold, the ECM interprets this as the TWC malfunction. The ECM then illumi-
nates the MIL and sets the DTC.
DTC No. DTC Detecting Condition Trouble Area
S Gas leakage on exhaust system
P0420 OSC value smaller than standard value under active air-fuel S A/F sensor (Bank 1, 2 sensor 1)
P0430 ratio control (2 trip detection logic) S Heated oxygen sensor (bank 1, 2 sensor 2)
S Three-way catalytic converter
HINT:
S Bank 1 refers to the bank that includes cylinder No.1.
S Bank 2 refers to the bank that does not include cylinder No.1.
S Sensor 1 refers to the sensor mounted in front of the Three-Way Catalytic Converter (TWC) and lo-
cated near the engine assembly.
S Sensor 2 refers to the sensor mounted behind the TWC and located far from the engine assembly.
DI-673
DIAGNOSTICS - ENGINE (2UZ-FE)
MONITOR STRATEGY
P0420 Bank 1 catalyst is deteriorated
Related DTCs
R l t d DTC
P0430 Bank 2 catalyst is deteriorated
Main sensors/components Front and rear heated oxygen sensor
Mass air flow meter, Engine coolant temperature
Required sensors/components
Related sensors/components sensor, Engine speed sensor, Intake air tempera-
ture sensor
Frequency of operation Once per driving cycle
Duration 30 sec.
MIL operation 2 driving cycles
Sequence of operation None
TYPICAL ENABLING CONDITIONS
Specification
Item
It
Minimum Maximum
The monitor will run whenever these
See page DI-437
DTCs are not present
Battery voltage 11 V -
Intake air temperature -10_C (14_F) -
Engine coolant temperature 75◦ Jabse Service Manual Search 2026 ◦ Jabse Pravopis ◦ onTap.bg ◦ Other service manual resources online : Fixya ◦ eServiceinfo