Monday, October 9, 2017

Ambient temperature values are implausible. / Readout too small (P0071)

Ambient temperature values are implausible. / Readout too small (P0071)
Ambient temperature values are implausible. / Readout too small (P0071)2010 Mercedes Benz E 63 AMG Sedan (212.077) V8­6.3L (156.985)
Copyright ? 2013, ALLDATA
10.52SS
Page 355
Possible cause:
­ Ambient temperature values are implausible.
Affected functions:
­
Engine diagnosis
­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­
Test 1: Ambient temperature
1. Ambient temperature
Preconditions for test Ambient temperature
Test prerequisite
­ 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 356
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 357
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