Manufacturer Code Charts: 3616

M16/4 (Rear throttle valve actuator) : Actual value potentiometer 1 : Short circuit to positive or open circuit (P0228)


Possible cause:

- M16/4 (Rear throttle valve actuator)
Affected functions:

- Engine diagnosis
- Engine output

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Test 1: Check component M16/4 (Rear throttle valve actuator).

1. Check component M16/4 (Rear throttle valve actuator).

Test 1.1: Check component M16/4 (Rear throttle valve actuator) using actual value.

Test 1.2: Check component M16/4 (Rear throttle valve actuator) by means of actuation.

Test 1.3: Check internal resistance of component M16/4m1 (Actuator motor).

Test 1.4: Test voltage supply of the potentiometers of component M16/4 (Rear throttle valve actuator).

1.1. Check component M16/4 (Rear throttle valve actuator) using actual value.
Test prerequisite

- Switch ignition on and wait at least for 60 s.
- Engine not running
Status of the relevant actual values:
- M16/4 (Rear throttle valve actuator) : Voltage 1:Warning! Communication with ECU required.
- M16/4 (Rear throttle valve actuator) : Voltage 2:Warning! Communication with ECU required.
Specified values

- M16/4 (Rear throttle valve actuator)Signal 1(Accelerator not operated): [0.30...1.00] V
- M16/4 (Rear throttle valve actuator)Signal 2(Accelerator not operated): [3.90...4.60] V
- M16/4 (Rear throttle valve actuator)Signal 1(Kickdown switch operated, accelerator fully depressed):[3.80...4.70] V
- M16/4 (Rear throttle valve actuator)Signal 2(Kickdown switch operated, accelerator fully depressed):[0.40...1.00] V
Question

- Are the actual values o.k.?


YES
The actual values are okay.End of test

NO
At least one of the relevant actual values is not okay.Possible cause and remedy

- Check power supply of component M16/4 (Rear throttle valve actuator).


1.2. Check component M16/4 (Rear throttle valve actuator) by means of actuation.
Test prerequisite

- Operate engine at idling speed.
Note

- If the throttle valve angle is< 1,1°, unmetered air may be present.
Status of relevant actual value:
- Throttle valve angle:Warning! Communication with ECU required.
Move on to actuation with button F2

1.3. Check internal resistance of component M16/4m1 (Actuator motor).
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).







Test sequence

- Switch off ignition.
- Connect socket box (126-pin) to component N3/10 (ME-SFI [ME] control unit).
- Disconnect coupling M at component N3/10 (ME-SFI [ME] control unit).
- Measure resistance with multimeter between sockets (M.96) 96 and (M.72) 72 of the 126-pole socket box tester.
Specified value

- Resistor[1...10]ohms
Question

- Is the measurement value OK?


YES
The measurement value is OK.End of test

NO
The measurement value is not OK.Possible cause and remedy

- Lines between N3/10 (ME-SFI [ME] control unit) and M16/4m1 (Actuator motor)
- M16/4m1 (Actuator motor)
End of test

1.4. Test voltage supply of the potentiometers of component M16/4 (Rear 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).







Test prerequisite

- At least one of the relevant actual values is not okay.
- The power supply of component N3/10 (ME-SFI [ME] control unit) is OK.
Test sequence

- Switch off ignition.
- Connect socket box (126-pin) to component N3/10 (ME-SFI [ME] control unit).
- Measure direct voltage with multimeter between sockets [M.39] 39 and [M.43] 43 of the 35-pole socket box tester.
- Switch on ignition.
Specified value

- Voltage[4.75...5.25] V
Question

- Is the measurement value OK?


YES
The measurement value is OK.Possible cause and remedy

- Check lines from component M16/4 (Rear throttle valve actuator) to component N3/10 (ME-SFI [ME] control unit).
End of test

NO
The measurement value is not OK.Possible cause and remedy

- Test wiring for Short circuit.
- N3/10 (ME-SFI [ME] control unit)
End of test