P2072

Throttle valve jamming (iced up) (P2072)


Possible cause:

- M16/6 (Throttle valve actuator)
Affected functions:

- Engine output

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Test 1: Check component M16/6 (Throttle valve actuator).

1. Check component M16/6 (Throttle valve actuator).

Test 1.1: Throttle valve jamming (iced up)

1.1. Throttle valve jamming (iced up)
Fault freeze frame data
Intake air temperature [°C] ( Limit value : 1 °C )

Test 1.1.1: Check component M16/6 (Throttle valve actuator) using actual value.

Test 1.1.2: Check internal resistance of component M16/6 (Throttle valve actuator).

Test 1.1.3: Perform mechanical inspection of component M16/6 (Throttle valve actuator).

1.1.1. Check component M16/6 (Throttle valve actuator) using actual value.
Warning!Communication with ECU required.


1.1.2. Check internal resistance of component M16/6 (Throttle valve actuator).
Figure legend

- A -ConnectionTest cable 35-pin socket box
- 001 -Sockets of component N3/10 (ME-SFI [ME] control unit)
- 05 -35-pin socket box
- 050 -126-pin socket box
- 108 -Test cable 266 589 01 63 00
- N3/10 (ME-SFI [ME] control unit)
- II 1-63ConnectionTest cable
- III 64-126ConnectionTest cable
Warning!

- Connection A of test cable 108 may NOT be connected to connection B of the 126-pin socket box (050).
Continue to test with button F2







Test prerequisites

- The throttle flap of component M16/6 (Throttle valve actuator) should operate freely and must not stick or rub.
- At least one of the relevant actual values is not okay.
Test sequence

- Switch off ignition.
- Remove component B2/5 (Hot film mass air flow sensor).
- Disconnect coupling M at component N3/10 (ME-SFI [ME] control unit).
M16/6r3 (Actual value potentiometer (sliding contact 1))

- Measure resistance with multimeter between sockets (M.88) 88 and (M.43) 43 of the 126-pole socket box tester.
- Slowly operate throttle flap by hand up to full load.
Specified values

- Throttle valve not actuated[ca. 1380]ohms
- Throttle valve fully actuated[ca. 480]ohms
M16/6r4 (Actual value potentiometer (sliding contact 2))

- Measure resistance with multimeter between sockets (M.64) 64 and (M.43) 43 of the 126-pole socket box tester.
- Slowly operate throttle flap by hand up to full load.
Specified values

- Throttle valve not actuated[ca. 650]ohms
- Throttle valve fully actuated[ca. 1490]ohms
Question

- Are the measurement values OK?


YES
The measurement values are OK.Further possible causes of fault

- Test voltage supply of the potentiometers of component M16/6 (Throttle valve actuator).


NO
The measurement values are not OK.Possible cause and remedy

- Lines to component M16/6 (Throttle valve actuator)
- M16/6 (Throttle valve actuator)
End of test

1.1.3. Perform mechanical inspection of component M16/6 (Throttle valve actuator).
Test sequence

- Switch off ignition.
- Expose component M16/6 (Throttle valve actuator).
- Slowly operate throttle flap by hand up to full load.
Specified value

- The throttle valve must not stick and must close by internal spring force.
Question

- Is the test o.k?


YES
The test is o.k..End of test

NO
The test is not o.k..Possible cause and remedy

- Check intake tract for residue and clean if necessary.If no residue is present, replace component M16/6 (Throttle valve actuator).