SLK 320 (170.465) V6-3.2L (112.947) (2002)
temperature after a cold start:
- Ignition system
- Idle speed control [ISC]
- Transmission shift delay
- Secondary air injection
- Insulation of exhaust manifold and front exhaust pipes.
Ideal operating conditions for high conversion rates and a long life prevail at temperatures between around 400 to 800 °C. The temperature of the three
way catalytic converter can increase beyond 1400 °C due to a malfunctioning of the engine such as misfiring etc. Such temperatures destroy the catalytic
converter by melting the ceramic monolith.
Another requirement for reliable long-term operation is that only unleaded fuel be used. Lead compounds form a deposit on the active surface and
prevent the exhaust gases from coming into contact with the catalytic layer.
Note: In view of its property of simultaneously reducing three pollutant components, it is known as a three-way catalytic converter.
Catalytic Converter Efficiency Monitoring Function
Catalytic Converter Efficiency Monitoring Function
Shown on engine 104 (USA)
A1E26
"CHECK ENGINE" MIL
N3/4
HFM-SFI [HFM] control unit
N3/10
ME-SFI control unit
G3/1
O2 sensor downstream of TWC
G3/2
O2 sensor upstream of TWC
X11/4
Data link connector
a
Amplitude of O2 sensor signal downstream of TWC
b
Amplitude of O2 sensor signal upstream of TWC
Task
Detecting catalytic converters with insufficient efficiency and operating engine diagnosis indictor lamp (EURO3/4) or CHECK ENGINE (USA) (MIL).