Test-ID 09: Engine Coolant Temperature (ECT) Sensor -G62- (Vehicles with engine code AVH, AZG): Procedure

WARNING: This page is about a different variant/trim than selected.

Connect diagnostic tester, see CONNECT DIAGNOSTIC TESTER .
Perform a road test until a coolant temperature of 80 to 100 °C has been reached, see DIAGNOSTIC MODE 1: CHECK MEASURED VALUES ; PID 5, Coolant temperature.
Observe the safety precautions that apply to road tests. See SAFETY PRECAUTIONS .
Switch ignition off.
Start engine at a coolant temperature of 80 to 90 °C and let it run at idle.
Perform a road test anew.
The following operating conditions must be met during this road test:
Accelerate vehicle uniformly, not at Wide Open Throttle (WOT).
Drive for 10 minutes in the highest gear or in the highest driving mode on a level driving surface at a constant speed in the range of 65 to 80 km/h at an engine speed of 2000 to 2500 RPM.

Let engine run at idle.
Under address word 33, select "Diagnostic mode 6: Check test results of components that are not continuously monitored".
Select the "Test -ID 09: Engine Coolant Temperature (ECT) sensor".
Check specified values at idle.