M16/3 (Front throttle valve actuator) : Actual value potentiometer 1 or 2 has failed. (P0120)

P0120
M16/3 (Front throttle valve actuator) : Actual value potentiometer 1 or 2 has failed. (P0120)
Possible cause:
­ M16/3 (Front throttle valve actuator)
Affected functions:
­
­
Engine diagnosis
Engine output
­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­
Test 1: Check component M16/3 (Front throttle valve actuator).
1. Check component M16/3 (Front throttle valve actuator).
Test 1.1: Check component M16/3 (Front throttle valve actuator) using actual value.
Test 1.2: Check component M16/3 (Front throttle valve actuator) by means of actuation.
Test 1.3: Check internal resistance of component M16/3m1 (Actuator motor).
Test 1.4: Test voltage supply of the potentiometers of component M16/3 (Front throttle valve actuator).
1.1. Check component M16/3 (Front 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:
­ M16/3 (Front throttle valve actuator) : Voltage 1: Warning! Communication with ECU required.
­ M16/3 (Front throttle valve actuator) : Voltage 2: Warning! Communication with ECU required.
Specified values
­ M16/3 (Front throttle valve actuator)Signal 1(Accelerator not operated): [0.30...1.00] V
­ M16/3 (Front throttle valve actuator)Signal 2(Accelerator not operated): [3.90...4.60] V
­ M16/3 (Front throttle valve actuator)Signal 1(Kickdown switch operated, accelerator fully depressed):[3.80...4.70] V
­ M16/3 (Front throttle valve actuator)Signal 2(Kickdown switch operated, accelerator fully depressed):[0.40...1.00] V
Question
Page 3962010 Mercedes Benz E 63 AMG Sedan (212.077) V8­6.3L (156.985)
­
Copyright ? 2013, ALLDATA
10.52SS
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 M16/3 (Front throttle valve actuator).
1.2. Check component M16/3 (Front 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 M16/3m1 (Actuator motor).
Figure legend
­ A ­ConnectionTest cable 35­pin socket box
­ 001 ­Sockets of component N3/10 (ME­SFI [ME] control unit)
­ 05 ­35­pin socket box
­ 050 ­126­pin socket box
­ 108 ­Test cable 266 589 01 63 00
­ N3/10 (ME­SFI [ME] control unit)
­ II 1­63ConnectionTest cable
­ III 64­126ConnectionTest cable
Warning!
­
­
Connection A of test cable 108 may NOT be connected to connection B of the 126­pin socket box (050).
Page 3972010 Mercedes Benz E 63 AMG Sedan (212.077) V8­6.3L (156.985)
Copyright ? 2013, ALLDATA
10.52SS
Test sequence
­ Switch off ignition.
­ Connect socket box (126­pin) to component N3/10 (ME­SFI [ME] control unit).
­ Disconnect coupling M at component N3/10 (ME­SFI [ME] control unit).
­ Measure resistance with multimeter between sockets (M.75) 75 and (M.74) 74 of the 126­pole 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 (ME­SFI [ME] control unit) and M16/3m1 (Actuator motor)
­ M16/3m1 (Actuator motor)
End of test
1.4. Test voltage supply of the potentiometers of component M16/3 (Front throttle valve actuator).
Figure legend
­ A ­ConnectionTest cable 35­pin socket box
­ 001 ­Sockets of component N3/10 (ME­SFI [ME] control unit)
­ 05 ­35­pin socket box
­ 050 ­126­pin socket box
­ 108 ­Test cable 266 589 01 63 00
­ N3/10 (ME­SFI [ME] control unit)
­ II 1­63ConnectionTest cable
­ III 64­126ConnectionTest cable
Warning!
­
­
Connection A of test cable 108 may NOT be connected to connection B of the 126­pin socket box (050).
Page 3982010 Mercedes Benz E 63 AMG Sedan (212.077) V8­6.3L (156.985)
Copyright ? 2013, ALLDATA
10.52SS
Page 399
Test prerequisite
­ At least one of the relevant actual values is not okay.
­ The power supply of component N3/10 (ME­SFI [ME] control unit) is OK.
Test sequence
­ Switch off ignition.
­ Connect socket box (126­pin) to component N3/10 (ME­SFI [ME] control unit).
­ Measure direct voltage with multimeter between sockets [M.39] 39 and [M.43] 43 of the 35­pole 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 M16/3 (Front throttle valve actuator) to component N3/10 (ME­SFI [ME] control unit).
End of test
NO
The measurement value is not OK.Possible cause and remedy
­ Test wiring for Short circuit.
­ N3/10 (ME­SFI [ME] control unit)
End of test