2010 Mercedes Benz C 300 (204.054) V6-3.0L (272.947) Page 1252

- The PremAir sensor must be installed and bonded in the second hole after being turned 180锟斤拷.

Note

- When the PremAir sensor is replaced the control unit log must also be sent in for warranty processing.

End of test

NO

The latching is not OK.Possible cause and remedy

- Check whether a PremAir radiator and PremAir sensor are installed, replace relevant parts if necessary.

End of test

2065

Component B11/4 (Coolant temperature sensor) has a short circuit to ground.

Possible cause:

- B11/4 (Coolant temperature sensor)

- Y110 (Three-disk thermostat valve)

- The cooling performance of the engine cooling system is poor.

Affected functions:

- Engine diagnosis

-------------------------------------------------

Test 1: The cooling performance of the engine cooling system is poor.

Test 2: Check component B11/4 (Coolant temperature sensor).

Test 3: Check component Y110 (Three-disk thermostat valve).

1. The cooling performance of the engine cooling system is poor.

The cooling performance of the engine cooling system is poor.

2. Check component B11/4 (Coolant temperature sensor).

Test 2.1: Check component B11/4 (Coolant temperature sensor) using actual value.

Test 2.2: Check signal lines on component B11/4 (Coolant temperature sensor).

Test 2.3: Check internal resistance of component B11/4 (Coolant temperature sensor).

2.1. Check component B11/4 (Coolant temperature sensor) using actual value.

Test prerequisite

- The actual value is not o.k.

Test sequence

- Switch on ignition.

Status of relevant actual value:

- Coolant temperature:Warning! Communication with ECU required.

- Coolant temperature sensor ( Signal voltage ):Warning! Communication with ECU required.

Specified values

- Voltage[20锟斤拷 C]: [3.45...3.32] V

- Voltage[30锟斤拷 C]: [2.93...2.82] V

- Voltage[40锟斤拷 C]: [2.41...2.32] V

- Voltage[50锟斤拷 C]: [1.93...1.86] V

- Voltage[60锟斤拷 C]: [1.51...1.46] V

- Voltage[70锟斤拷 C]: [1.18...1.13] V

- Voltage[80锟斤拷 C]: [0.90...0.87] V

- Voltage[90锟斤拷 C]: [0.70...0.67] V

- Voltage[100锟斤拷 C]: [0.54...0.25] V

- Voltage[110锟斤拷 C]: [0.42...0.40] V

Question

- Are the measurement values OK?