B14 (Ambient temperature display temperature sensor) : Short circuit to positive (P0073)

P0073
B14 (Ambient temperature display temperature sensor) : Short circuit to positive (P0073)
Possible cause:
B14 (Ambient temperature display temperature sensor)
Affected functions:

Engine output

Test 1: Ambient temperature
Test 2: Check component B14 (Ambient temperature display temperature sensor).
1. Ambient temperature
Preconditions for test Ambient temperature
Test prerequisite
10.52SS
Page 8312010 Mercedes Benz E 63 AMG Sedan (212.077) V86.3L (156.985)
Copyright ? 2013, ALLDATA
10.52SS
Page 832
Air filter and associated hoses are correctly fitted.
Test sequence
Drive vehicle with constant engine load at a speed of > 50 km/h (> 31 mph) for approx. 5 min.
Status of the relevant actual values:
Ambient temperature:Warning! Communication with ECU required.
Intake air temperature:Warning! Communication with ECU required.
Question

Is the temperature difference between component B14 (Ambient temperature display temperature sensor) and component B17
(Intake air temperature sensor) greater than 40? C?
YES
Test 1.1: Check component B14 (Ambient temperature display temperature sensor).
Test 1.2: Check component B17 (Intake air temperature sensor).
1.1. Check component B14 (Ambient temperature display temperature sensor).
Test prerequisite
Relevant fault codes exist or a complaint has been received.
Test sequence
Detach coupling at component B14 (Ambient temperature display temperature sensor).
Measure resistance with multimeter between pins (B14)1 and (B14) 2
Status of the relevant actual values:Specified value
Temperature0? C:Resistor= [8.0...12.0] kohms
Temperature10? C:Resistor= [4.5...7.0] kohms
Temperature20? C:Resistor= [3.0...4.5] kohms
Temperature30? C:Resistor= [2.0...3.0] kohms
Temperature40? C:Resistor= [1.3...2.0] kohms
Question:Are the measurement values OK?
YES
The measurement values are OK.Possible cause and remedy
Test wiring (N10/10) 3.3 (B14) 2 for Short circuit or open circuit
Test wiring (N10/10) 3.14 (B14) 1 for Open circuit
Component N10/10 (Driverside SAM control module) is defective.
End of test2010 Mercedes Benz E 63 AMG Sedan (212.077) V86.3L (156.985)
Copyright ? 2013, ALLDATA
10.52SS
Page 833
NO
The measurement values are not OK.Possible cause and remedy
Component B14 (Ambient temperature display temperature sensor) is defective.
End of test
1.2. Check component B17 (Intake air temperature sensor).
Test 1.2.1: Check component B17 (Intake air temperature sensor) using actual value.
Test 1.2.2: Check plausibility of actual value B17 (Intake air temperature sensor) in control module ME 9.7 (AMG).
Test 1.2.3: Check internal resistance of component B17 (Intake air temperature sensor).
1.2.1. Check component B17 (Intake air temperature sensor) using actual value.
Test sequence
Switch on ignition.
Status of relevant actual value:
Intake air temperature:Warning! Communication with ECU required.
Specified value
Current temperature in area surrounding component B17 (Intake air temperature sensor)
Question

Is the actual value o.k.?
YES
The actual value is okay.End of test
NO
The actual value is not o.k.Possible cause and remedy

Check plausibility of actual value B17 (Intake air temperature sensor) in control module N3/10 (MESFI [ME] control unit).
Check internal resistance of component B17 (Intake air temperature sensor).2010 Mercedes Benz E 63 AMG Sedan (212.077) V86.3L (156.985)
Copyright ? 2013, ALLDATA
10.52SS
Page 834
1.2.2. Check plausibility of actual value B17 (Intake air temperature sensor) in control module ME 9.7 (AMG).
Test prerequisite
The actual value is not o.k.
Test sequence
Detach coupling at component B17 (Intake air temperature sensor).
Switch on ignition.
Status of relevant actual value:
Intake air temperature:Warning! Communication with ECU required.
Specified value

If the connector is unplugged at component B17 (Intake air temperature sensor), value [ 40? C ] is displayed.
Bridge pin 1 in pin 2 at the unplugged connection of component B17 (Intake air temperature sensor).The value is approx. [ 150? C ]
for a short period of time and drops back down to the substitute value of approx. [ 40? C ].
Question

Is the actual value o.k.?
YES
The actual value is okay.Further possible causes of fault

Check internal resistance of component B17 (Intake air temperature sensor).
NO
The actual value is not o.k.Possible cause and remedy
Signal wire
End of test
1.2.3. Check internal resistance of component B17 (Intake air temperature sensor).
Test sequence
Switch off ignition.
Detach coupling at component B17 (Intake air temperature sensor).
Measure resistance with multimeter between pins (B17) 1 and (B17) 2
Specified value
Resistor(20? C): [2350...2500]ohms
Resistor(30? C): [1600...1700]ohms
Resistor(40? C): [1100...1200]ohms
Resistor(50? C): [800...900]ohms
Question

Are the measurement values OK?
YES
The measurement values are OK.End of test
NO
The measurement values are not OK.Possible cause and remedy
B17 (Intake air temperature sensor)
End of test
NO
Ambient temperature
The temperature difference is not greater than 40 ?C.End of test
2. Check component B14 (Ambient temperature display temperature sensor).2010 Mercedes Benz E 63 AMG Sedan (212.077) V86.3L (156.985)
Copyright ? 2013, ALLDATA
Test 2.1: Check component B14 (Ambient temperature display temperature sensor).
2.1. Check component B14 (Ambient temperature display temperature sensor).
Test prerequisite
Relevant fault codes exist or a complaint has been received.
Test sequence
Detach coupling at component B14 (Ambient temperature display temperature sensor).
Measure resistance with multimeter between pins (B14)1 and (B14) 2
Status of the relevant actual values:Specified value
Temperature0? C:Resistor= [8.0...12.0] kohms
Temperature10? C:Resistor= [4.5...7.0] kohms
Temperature20? C:Resistor= [3.0...4.5] kohms
Temperature30? C:Resistor= [2.0...3.0] kohms
Temperature40? C:Resistor= [1.3...2.0] kohms
Question:Are the measurement values OK?
YES
The measurement values are OK.Possible cause and remedy
Test wiring (N10/10) 3.3 (B14) 2 for Short circuit or open circuit
Test wiring (N10/10) 3.14 (B14) 1 for Open circuit
Component N10/10 (Driverside SAM control module) is defective.
End of test
NO
The measurement values are not OK.Possible cause and remedy
Component B14 (Ambient temperature display temperature sensor) is defective.
End of test

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