@Тимур 33, случайно вспомнил, что у меня есть, оказыватеся дока по американкам :))
Лучше поздно, чем никогда :)
По ошибке 2423
DTC P2423 TOYOTA-HCAC-SYSTEM (BANK l) - PZEV ENGINE
HINT: This DTC has been added to meet the requirement for Partial Zero Emission Vehicle (PZEV).
CIRCUIT DESCRIPTION
DTC Detection Condition: “Signal Length Ratio” is greater than 0.75
Trouble Area:
- HC adsorb three-way catalyst (inside exhaust front pipe)
- Gas leakage in exhaust system
- Heated oxygen sensor 2 (bank 1 sensor 2)
- Heated oxygen sensor 3 (bank 1 sensor 3)
Monitor Strategy:
Related DTCs P2423: Rear catalyst has deteriorated Required sensors/components (Main) Heated oxygen sensor Required sensors/ components (Related) ECT sensor, IAT sensor, Engine speed sensor, MAF meter, Park/Neutral position switch Frequency of operation Once per driving cycles Duration About 30 seconds MIL operation 2-6 driving cycles Sequence operation Front catalyst monitoring is completed and heated oxygen sensor 3 monitoring detected “PASS”.
Typical Enabling Conditions
The monitor will run whenever this DTC is not present See Monitors, Trips and/or Drive Cycle Front catalyst monitor detecting Complete Heated oxygen sensor 3 status Activated Heated oxygen sensor 3 pass determination Pass detection
Typical Malfunction threshold
Catalyst deterioration ratio level condition: Signal length ratio 0.75 or more
Mode 06 Data
TID $0D: Hydro-carbon (HC) absorber deterioration
TLT CID Unit conversion Description of Test Data Description of Test Limit 0 $01 Multiply by 0.0078 (no dimension) HC absorber deterioration level determined by waveforms of HO2S 2 and 3 Malfunction criteria for HC absorber deterioration
Hydrocarbon Absorptive Catalyst (HCAC) system consists of the Three-way Catalyst (TWC) and two heated oxygen sensors. The TWC has a character of absorbing hydrocarbons (HC) emitted soon after the engine start. The two heated oxygen sensors, sensor 2 and sensor 3, are used to detect deterioration in the TWC.
The HCAC system is installed in the lower part of the exhaust system, after the front catalyst.
The ceramic portion of this catalyst is coated with the HC adsorbent* material. The TWC material is coated on top of the HC adsorption layer.
*: Adsorption is similar to absorption except that the material (in this case HC molecules) adhere to a surface rather than being absorbed into it.
While " active air-fuel ratio control" for detecting the front catalyst deterioration is performed, the ECM determines if the rear catalyst has deteriorated as well.
The ECM compares the waveforms of the heated oxygen sensors located before and after the rear catalyst to determine if the catalyst capacity has deteriorated.
If the catalyst is functioning normally, the waveform of the heated oxygen sens or 3 indicates RICH and LEAN alternation more slowly than the waveform of the heated oxygen sens or 2 located before the catalyst. If both waveform variation rates are similar, indicates that the catalyst capacity has deteriorated.
When running the monitor, the ECM compares the signals of sensor 2 and sensor 3 over a specific time to determine the TWC efficiency. The ECM calculates the signal length of both sensors and uses them to obtain the signal length ratio by the following formula. (*note: there is the formula in a diagram below this test) The signal length ratio is compared with the failure threshold by the ECM.