NHTSA ID Number: 10167203
Manufacturer Communication Number: IK0800284
TSB/Document Date: 2019-11-05
Summary
Ambient Air Temperature (AAT) Sensor Faults/Location/Diagnostics
IK0800284 - Ambient Air Temperature (AAT) Sensor Faults/Location/Diagnostics
Page 1 of 13
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IK0800284
Revision:
23
Major System: ELECTRICAL SYSTEM
Created:
5/16/2011
Current
Language:
English
Last
Modified:
10/2/2019
Other
Languages:
Français, Español,
Author:
Charles
Schroeder
Viewed:
20227
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Title : Ambient Air Temperature (AAT) Sensor Faults/Location/Diagnostics
Applies To : Navistar
N13 Engines and Cummins ISX Engines Cummins ISB, N9 and N10
Please refer to the change log text box below for recent changes to this article:
10/02/2019 - Added note to refer to technician manual for information and troubleshooting on LT / RH / HV / MV
11/05/2018 - Formatting update. No content change.
11/20/2017 Updated diagnostic software to Navistar Engine Diagnostics™.
03/13/2017 - Added link to IK1200886 - Relocation of AAT Sensor to Mirror due to Fault Codes and Air Temp Flow Issues with
Aftermarket Bumpers as this relocation changes the wiring for the sensor.
02/24/2017 - Updated to correct author
08/12/2015 - Removed 2010 MaxxForce 11/13. Please refer to updated manual 0000001741.
Table of Contents
Click on the items below to jump to each section:
Description
Cluster Circuit Diagrams
Symptom(s)
Sensor Location - Big Bore Engines
Special Tool(s) / Software
Sensor Location - Medium Duty Engines
Service Parts Information
Engine Sensor Circuit Diagrams (See NOTES below)
Engine Sensor Troubleshooting
Warranty Coding / SRT
Cluster Sensor Troubleshooting
Other Resources
For current Models (LT / RH / HV / MV) please refer to the appropriate technician manual for Ambient Air Temperature (AAT) Sensor
information and troubleshooting.
Description
The Ambient Air Temperature Sensor provides information to the Engine and / or Cluster based on vehicle model and engine application. The
number of sensors used and location of each sensor also varies based on vehicle model and engine application. This article will help outline
the different installation options for this sensor.
On all SCR vehicles, the cluster will receive AAT Sensor data via J1939, 0595BTH, reducing the number of AAT sensors from 2 to 1
on each SCR vehicle.
If unable to find AAT sensor in the mirror, check service portal for previous repairs. We have seen cases where the mirror head was
replaced, and the sensor was not reinstalled properly.
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IK0800284 - Ambient Air Temperature (AAT) Sensor Faults/Location/Diagnostics
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If the sensor was relocated the mirror the wiring for the sensor will not match the schematic based on the vehicles build date.
Please refer to IK1200886 - Relocation of AAT Sensor to Mirror due to Fault codes and Air Temp Flow Issues with Aftermarket
Bumpers for more information.
For current Models (LT / RH / HV / MV) please refer to the appropriate technician manual for Ambient Air Temperature (AAT) Sensor
information and troubleshooting.
( Return to Top )
Symptom(s)
Diagnostic Trouble Code(s) & Dashboard Indicator Light(s):
DTC / Light
Cummins Fault
Description
SPN 171 FMI 2
2389
AAT signal does not agree with other sensors
SPN 171 FMI 3
249
AAT signal out of range HIGH
SPN 171 FMI 4
256
AAT signal out of range LOW
Customer Observations or Concerns:
• MIL
• Engine performance may be reduced
• Unable to perform regen
( Return to Top )
Special Tool(s) / Software
Tool Description
Tool Number
Comments
EZ-Tech Software
Cummins INSITE
EZ-Tech Software
Instructions
( Return to Top )
Service Parts Information
Kit Description
Part Number
Quantity
Notes
Required
Sender, Ambient Temperature
3561562C1
1
( Return to Top )
Engine Sensor Troubleshooting
There are two ambient temperature sensors. The sensor located behind the cab along the left frame rail is the sensor the engine uses. To
confirm this, unplug the sensor and observe the cluster LCD display, it the reading stays the same, the correct sensor is unplugged. There is
also a sensor located at the front of the chassis that the gauge cluster uses for the temp display.
This article begins and discusses the Engine AAT Sensor, prior to and first. After August 23, 2013, Some SCR engines have the Engine AAT
sensor mounted in the driver side mirror head and alternatively the sensor could be mounted to the horn bracket. The location depends on
build date.
2013 Navistar N13 Diagnostics
FAULT CODE 171-2 ONLY
Step
1
Action
Update ECM Calibration
Decision
Repair Complete.
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• Check Calibration Scorecard on Service Portal
• Use Electronic Service Tool (EST) to clear the fault code.
This code will be corrected with the new ECM Calibration
2010 MaxxForce 11/13L Diagnostics
FAULT CODE 171-2 ONLY
NOTE: If the ECM is setting/logging code 171-2 and the sensor tests good DO NOT replace the sensor, there is a new calibration available
as of March 7, 2014 for EGR engines.
Action
Decision
Update ECM Calibration
1
• Check Calibration Scorecard on Service Portal
• Use Electronic Service Tool (EST) to clear the fault code.
Repair Complete.
This code will be corrected with the new ECM Calibration
All Engines with Ambient Air Temp Sensor
FAULT CODE(s) 171-3 and 171-4 ONLY
Refer to the appropriate Engine or Chassis wiring schematic manual to ensure you are on the proper ECM connector and terminal.
Step Action
Measure Resistance of the sensor and compare to
the chart shown in Figure 1
1
Step Action
Measure voltage between ambient temperature
sensor connector cavity A and GND
• SPEC: 5 +/- 0.5 Vdc
Is voltage measurement in spec?
Step Action
Measure voltage between ambient temperature
sensor connector cavity A and cavity B
3
Yes: Go to step 2
• SPEC: Based on Ambient Temp
Is resistance measurement in spec?
2
Decision
No: Replace AAT Sensor
Decision
Yes: Go to step 3
No: Inspect wire from ECM to AAT sensor pin A for
open or short
Decision
Yes: Restore back to operational condition and
retest for fault code 171-3 or 171-4
• SPEC: 5 +/- 0.5 Vdc
Is voltage measurement in spec?
No: Inspect ZVR wire from ECM to AAT sensor pin
B for open or short
( Return to Top )
Cluster Sensor Troubleshooting
FAULT CODE(s) 171-3 and 171-4 ONLY
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The instrument cluster, connector 1501 pin 9, sends a 5-volt source to the temperature sensor. As the voltage goes across the temperature
sensor it decreases, the amount of voltage drop depends on outside temperature. The reduced voltage then returns to the instrument cluster
on pin 8 of connector 1500. The instrument cluster turns the received signal into to the temperature shown on the display.
NOTE: The Electronic Gage Cluster display will replace temperature reading with two dashes (- -) if a fault is present with the Ambient
Temperature Sensor circuit.
Step Action
Decision
Measure Resistance of the sensor and compare to
the chart shown in Figure 1
1
• SPEC: Based on Ambient Temp
No: Replace AAT Sensor
Is resistance measurement in spec?
Step Action
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TSB/Document ID: IK0800284
Replacement Service Bulletin Number:
MFR Communication Date: 2019-10-02
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: ENGINE AND ENGINE COOLING
MFR Component System:
MFR Component Subsystem:
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