Upstream catalyst temperature in the EEC system
Check the signal from the sensor.See if there is any visible fault on the sensor, wiring or connectors. For engines with NOx-control software, confirmation of repair requires:- Make sure the catalyst temperature sensor is not faulty- Execute the ‘SCR invalidation test’ with SDP3 (takes approximately 30 minutes and needs to be run outdoors)- Or make sure engine speed is strictly above 1000 rpm and catalyst temperature is above 200degC for 600 s four times in a row, with ignition key off in betweenIf the fault is remedied, the DTC should now be passive.
What you'll see
No driver-visible symptom recorded.
System reaction
The EEC system will not inject any urea, which leads to higher emissions.For engines with NOx-control software, this DTC is classed as a type D failure.
Diagnostic depth
The upstream catalyst temperature sensor signal is not plausible.
The upstream catalyst temperature sensor is faulty. The sensor signal is stuck at a low value.