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
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
