2010 Mercedes Benz C 300 (204.054) V6-3.0L (272.947) Page 1025

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Test 1: Check component B28 (Pressure sensor).

1. Check component B28 (Pressure sensor).

Test 1.1: Check component B28 (Pressure sensor) using actual value.

Test 1.2: Check power supply of component B28 (Pressure sensor).

Test 1.3: Test signal voltage of component B28 (Pressure sensor).

1.1. Check component B28 (Pressure sensor) using actual value.

Test sequence

- Switch on ignition.

Status of relevant actual value:

- Coolant temperature:Warning! Communication with ECU required.

- Intake manifold pressure (ADC):Warning! Communication with ECU required.

Specified values

- Coolant temperature > 80锟斤拷 C

- Intake manifold pressure,Ignition ON: > 3.5 V

- Intake manifold pressure,Operate engine at idling speed.:< 2 V

Question

- Is the actual value o.k.?

YES

The actual value is okay.End of test

NO

The actual value is not o.k.Possible cause and remedy

- Check power supply of component B28 (Pressure sensor).

- Test signal voltage of component B28 (Pressure sensor).

Further possible causes of fault

- Vacuum line

1.2. Check power supply of component B28 (Pressure sensor).

Figure legend

- B28 (Pressure sensor)

- 126/1 -'Secondary air injection left bank of cylinders' shutoff valve

Test prerequisite

- The actual value is not o.k.

Test sequence

- Switch off ignition.

- Detach coupling at component B28 (Pressure sensor).

- Measure direct voltage with multimeter between sockets (B28) 1 and (B28) 3

- Switch on ignition.

Specified value

- Voltage[4.75...5.25] V

Question

- Is the measurement value OK?