P0123
M16/3 (Front throttle valve actuator) : Actual value potentiometer 1 : Short circuit to positive or open circuit (P0123)
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
Are the actual values o.k.?
YES
The actual values are okay.End of test2010 Mercedes Benz E 63 AMG Sedan (212.077) V86.3L (156.985)
Copyright ? 2013, ALLDATA
10.52SS
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).
Test sequence
Switch off ignition.
Connect socket box (126pin) to component N3/10 (MESFI [ME] control unit).
Page 4072010 Mercedes Benz E 63 AMG Sedan (212.077) V86.3L (156.985)
Copyright ? 2013, ALLDATA
10.52SS
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).
Test prerequisite
Page 4082010 Mercedes Benz E 63 AMG Sedan (212.077) V86.3L (156.985)
Copyright ? 2013, ALLDATA
10.52SS
Page 409
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 : Short circuit to positive or open circuit (P0123)
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
Are the actual values o.k.?
YES
The actual values are okay.End of test2010 Mercedes Benz E 63 AMG Sedan (212.077) V86.3L (156.985)
Copyright ? 2013, ALLDATA
10.52SS
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).
Test sequence
Switch off ignition.
Connect socket box (126pin) to component N3/10 (MESFI [ME] control unit).
Page 4072010 Mercedes Benz E 63 AMG Sedan (212.077) V86.3L (156.985)
Copyright ? 2013, ALLDATA
10.52SS
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).
Test prerequisite
Page 4082010 Mercedes Benz E 63 AMG Sedan (212.077) V86.3L (156.985)
Copyright ? 2013, ALLDATA
10.52SS
Page 409
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
